From e481b7cab7b81688d3baf9325baf4c37967ea108 Mon Sep 17 00:00:00 2001 From: dsc Date: Tue, 14 Feb 2012 12:00:59 -0800 Subject: [PATCH] Demo graph! --- lib/main.co | 18 +- lib/server.co | 2 +- static/vendor/dygraph.js | 7333 ++++++++++++++++++++++++++++++++++++++++++++++ www/index.jade | 4 +- www/layout.jade | 3 +- 5 files changed, 7356 insertions(+), 4 deletions(-) create mode 100644 static/vendor/dygraph.js diff --git a/lib/main.co b/lib/main.co index 9ca68c9..db7c644 100644 --- a/lib/main.co +++ b/lib/main.co @@ -1 +1,17 @@ -console.log 'hi' \ No newline at end of file +g = null + +main = -> + console.log 'hi' + g = new Dygraph do + $ '#graphdiv' .0 + "Date,Temperature\n + 2008-05-07,75\n + 2008-05-08,70\n + 2008-05-09,80\n" + {} + + + + + +jQuery main \ No newline at end of file diff --git a/lib/server.co b/lib/server.co index ce61012..62d83dc 100755 --- a/lib/server.co +++ b/lib/server.co @@ -43,7 +43,7 @@ app.configure -> jade : require 'jade' fs : fs - app.use express.logger() + # app.use express.logger() app.use express.bodyParser() app.use express.methodOverride() app.use app.router diff --git a/static/vendor/dygraph.js b/static/vendor/dygraph.js new file mode 100644 index 0000000..1638ad7 --- /dev/null +++ b/static/vendor/dygraph.js @@ -0,0 +1,7333 @@ +/** + * @license + * Copyright 2011 Dan Vanderkam (danvdk@gmail.com) + * MIT-licensed (http://opensource.org/licenses/MIT) + */ + +/** + * @fileoverview Based on PlotKitLayout, but modified to meet the needs of + * dygraphs. + */ + +/*jshint globalstrict: true */ +/*global Dygraph:false */ +"use strict"; + +/** + * Creates a new DygraphLayout object. + * + * This class contains all the data to be charted. + * It uses data coordinates, but also records the chart range (in data + * coordinates) and hence is able to calculate percentage positions ('In this + * view, Point A lies 25% down the x-axis.') + * + * Two things that it does not do are: + * 1. Record pixel coordinates for anything. + * 2. (oddly) determine anything about the layout of chart elements. + * + * The naming is a vestige of Dygraph's original PlotKit roots. + * + * @constructor + */ +var DygraphLayout = function(dygraph) { + this.dygraph_ = dygraph; + this.datasets = []; + this.annotations = []; + this.yAxes_ = null; + + // TODO(danvk): it's odd that xTicks_ and yTicks_ are inputs, but xticks and + // yticks are outputs. Clean this up. + this.xTicks_ = null; + this.yTicks_ = null; +}; + +DygraphLayout.prototype.attr_ = function(name) { + return this.dygraph_.attr_(name); +}; + +DygraphLayout.prototype.addDataset = function(setname, set_xy) { + this.datasets[setname] = set_xy; +}; + +DygraphLayout.prototype.getPlotArea = function() { + return this.computePlotArea_(); +}; + +// Compute the box which the chart should be drawn in. This is the canvas's +// box, less space needed for axis and chart labels. +DygraphLayout.prototype.computePlotArea_ = function() { + var area = { + // TODO(danvk): per-axis setting. + x: 0, + y: 0 + }; + if (this.attr_('drawYAxis')) { + area.x = this.attr_('yAxisLabelWidth') + 2 * this.attr_('axisTickSize'); + } + + area.w = this.dygraph_.width_ - area.x - this.attr_('rightGap'); + area.h = this.dygraph_.height_; + if (this.attr_('drawXAxis')) { + if (this.attr_('xAxisHeight')) { + area.h -= this.attr_('xAxisHeight'); + } else { + area.h -= this.attr_('axisLabelFontSize') + 2 * this.attr_('axisTickSize'); + } + } + + // Shrink the drawing area to accomodate additional y-axes. + if (this.dygraph_.numAxes() == 2) { + // TODO(danvk): per-axis setting. + area.w -= (this.attr_('yAxisLabelWidth') + 2 * this.attr_('axisTickSize')); + } else if (this.dygraph_.numAxes() > 2) { + this.dygraph_.error("Only two y-axes are supported at this time. (Trying " + + "to use " + this.dygraph_.numAxes() + ")"); + } + + // Add space for chart labels: title, xlabel and ylabel. + if (this.attr_('title')) { + area.h -= this.attr_('titleHeight'); + area.y += this.attr_('titleHeight'); + } + if (this.attr_('xlabel')) { + area.h -= this.attr_('xLabelHeight'); + } + if (this.attr_('ylabel')) { + // It would make sense to shift the chart here to make room for the y-axis + // label, but the default yAxisLabelWidth is large enough that this results + // in overly-padded charts. The y-axis label should fit fine. If it + // doesn't, the yAxisLabelWidth option can be increased. + } + + if (this.attr_('y2label')) { + // same logic applies here as for ylabel. + // TODO(danvk): make yAxisLabelWidth a per-axis property + } + + // Add space for range selector, if needed. + if (this.attr_('showRangeSelector')) { + area.h -= this.attr_('rangeSelectorHeight') + 4; + } + + return area; +}; + +DygraphLayout.prototype.setAnnotations = function(ann) { + // The Dygraph object's annotations aren't parsed. We parse them here and + // save a copy. If there is no parser, then the user must be using raw format. + this.annotations = []; + var parse = this.attr_('xValueParser') || function(x) { return x; }; + for (var i = 0; i < ann.length; i++) { + var a = {}; + if (!ann[i].xval && !ann[i].x) { + this.dygraph_.error("Annotations must have an 'x' property"); + return; + } + if (ann[i].icon && + !(ann[i].hasOwnProperty('width') && + ann[i].hasOwnProperty('height'))) { + this.dygraph_.error("Must set width and height when setting " + + "annotation.icon property"); + return; + } + Dygraph.update(a, ann[i]); + if (!a.xval) a.xval = parse(a.x); + this.annotations.push(a); + } +}; + +DygraphLayout.prototype.setXTicks = function(xTicks) { + this.xTicks_ = xTicks; +}; + +// TODO(danvk): add this to the Dygraph object's API or move it into Layout. +DygraphLayout.prototype.setYAxes = function (yAxes) { + this.yAxes_ = yAxes; +}; + +DygraphLayout.prototype.setDateWindow = function(dateWindow) { + this.dateWindow_ = dateWindow; +}; + +DygraphLayout.prototype.evaluate = function() { + this._evaluateLimits(); + this._evaluateLineCharts(); + this._evaluateLineTicks(); + this._evaluateAnnotations(); +}; + +DygraphLayout.prototype._evaluateLimits = function() { + this.minxval = this.maxxval = null; + if (this.dateWindow_) { + this.minxval = this.dateWindow_[0]; + this.maxxval = this.dateWindow_[1]; + } else { + for (var name in this.datasets) { + if (!this.datasets.hasOwnProperty(name)) continue; + var series = this.datasets[name]; + if (series.length > 1) { + var x1 = series[0][0]; + if (!this.minxval || x1 < this.minxval) this.minxval = x1; + + var x2 = series[series.length - 1][0]; + if (!this.maxxval || x2 > this.maxxval) this.maxxval = x2; + } + } + } + this.xrange = this.maxxval - this.minxval; + this.xscale = (this.xrange !== 0 ? 1/this.xrange : 1.0); + + for (var i = 0; i < this.yAxes_.length; i++) { + var axis = this.yAxes_[i]; + axis.minyval = axis.computedValueRange[0]; + axis.maxyval = axis.computedValueRange[1]; + axis.yrange = axis.maxyval - axis.minyval; + axis.yscale = (axis.yrange !== 0 ? 1.0 / axis.yrange : 1.0); + + if (axis.g.attr_("logscale")) { + axis.ylogrange = Dygraph.log10(axis.maxyval) - Dygraph.log10(axis.minyval); + axis.ylogscale = (axis.ylogrange !== 0 ? 1.0 / axis.ylogrange : 1.0); + if (!isFinite(axis.ylogrange) || isNaN(axis.ylogrange)) { + axis.g.error('axis ' + i + ' of graph at ' + axis.g + + ' can\'t be displayed in log scale for range [' + + axis.minyval + ' - ' + axis.maxyval + ']'); + } + } + } +}; + +DygraphLayout._calcYNormal = function(axis, value) { + if (axis.logscale) { + return 1.0 - ((Dygraph.log10(value) - Dygraph.log10(axis.minyval)) * axis.ylogscale); + } else { + return 1.0 - ((value - axis.minyval) * axis.yscale); + } +}; + +DygraphLayout.prototype._evaluateLineCharts = function() { + // add all the rects + this.points = []; + // An array to keep track of how many points will be drawn for each set. + // This will allow for the canvas renderer to not have to check every point + // for every data set since the points are added in order of the sets in + // datasets. + this.setPointsLengths = []; + + for (var setName in this.datasets) { + if (!this.datasets.hasOwnProperty(setName)) continue; + + var dataset = this.datasets[setName]; + var axis = this.dygraph_.axisPropertiesForSeries(setName); + + var setPointsLength = 0; + + for (var j = 0; j < dataset.length; j++) { + var item = dataset[j]; + var xValue = parseFloat(item[0]); + var yValue = parseFloat(item[1]); + + // Range from 0-1 where 0 represents left and 1 represents right. + var xNormal = (xValue - this.minxval) * this.xscale; + // Range from 0-1 where 0 represents top and 1 represents bottom + var yNormal = DygraphLayout._calcYNormal(axis, yValue); + + var point = { + // TODO(danvk): here + x: xNormal, + y: yNormal, + xval: xValue, + yval: yValue, + name: setName + }; + this.points.push(point); + setPointsLength += 1; + } + this.setPointsLengths.push(setPointsLength); + } +}; + +DygraphLayout.prototype._evaluateLineTicks = function() { + var i, tick, label, pos; + this.xticks = []; + for (i = 0; i < this.xTicks_.length; i++) { + tick = this.xTicks_[i]; + label = tick.label; + pos = this.xscale * (tick.v - this.minxval); + if ((pos >= 0.0) && (pos <= 1.0)) { + this.xticks.push([pos, label]); + } + } + + this.yticks = []; + for (i = 0; i < this.yAxes_.length; i++ ) { + var axis = this.yAxes_[i]; + for (var j = 0; j < axis.ticks.length; j++) { + tick = axis.ticks[j]; + label = tick.label; + pos = this.dygraph_.toPercentYCoord(tick.v, i); + if ((pos >= 0.0) && (pos <= 1.0)) { + this.yticks.push([i, pos, label]); + } + } + } +}; + + +/** + * Behaves the same way as PlotKit.Layout, but also copies the errors + * @private + */ +DygraphLayout.prototype.evaluateWithError = function() { + this.evaluate(); + if (!(this.attr_('errorBars') || this.attr_('customBars'))) return; + + // Copy over the error terms + var i = 0; // index in this.points + for (var setName in this.datasets) { + if (!this.datasets.hasOwnProperty(setName)) continue; + var j = 0; + var dataset = this.datasets[setName]; + var axis = this.dygraph_.axisPropertiesForSeries(setName); + for (j = 0; j < dataset.length; j++, i++) { + var item = dataset[j]; + var xv = parseFloat(item[0]); + var yv = parseFloat(item[1]); + + if (xv == this.points[i].xval && + yv == this.points[i].yval) { + var errorMinus = parseFloat(item[2]); + var errorPlus = parseFloat(item[3]); + + var yv_minus = yv - errorMinus; + var yv_plus = yv + errorPlus; + this.points[i].y_top = DygraphLayout._calcYNormal(axis, yv_minus); + this.points[i].y_bottom = DygraphLayout._calcYNormal(axis, yv_plus); + } + } + } +}; + +DygraphLayout.prototype._evaluateAnnotations = function() { + // Add the annotations to the point to which they belong. + // Make a map from (setName, xval) to annotation for quick lookups. + var i; + var annotations = {}; + for (i = 0; i < this.annotations.length; i++) { + var a = this.annotations[i]; + annotations[a.xval + "," + a.series] = a; + } + + this.annotated_points = []; + + // Exit the function early if there are no annotations. + if (!this.annotations || !this.annotations.length) { + return; + } + + // TODO(antrob): loop through annotations not points. + for (i = 0; i < this.points.length; i++) { + var p = this.points[i]; + var k = p.xval + "," + p.name; + if (k in annotations) { + p.annotation = annotations[k]; + this.annotated_points.push(p); + } + } +}; + +/** + * Convenience function to remove all the data sets from a graph + */ +DygraphLayout.prototype.removeAllDatasets = function() { + delete this.datasets; + this.datasets = []; +}; + +/** + * Return a copy of the point at the indicated index, with its yval unstacked. + * @param int index of point in layout_.points + */ +DygraphLayout.prototype.unstackPointAtIndex = function(idx) { + var point = this.points[idx]; + + // Clone the point since we modify it + var unstackedPoint = {}; + for (var pt in point) { + unstackedPoint[pt] = point[pt]; + } + + if (!this.attr_("stackedGraph")) { + return unstackedPoint; + } + + // The unstacked yval is equal to the current yval minus the yval of the + // next point at the same xval. + for (var i = idx+1; i < this.points.length; i++) { + if (this.points[i].xval == point.xval) { + unstackedPoint.yval -= this.points[i].yval; + break; + } + } + + return unstackedPoint; +}; +/** + * @license + * Copyright 2006 Dan Vanderkam (danvdk@gmail.com) + * MIT-licensed (http://opensource.org/licenses/MIT) + */ + +/** + * @fileoverview Based on PlotKit.CanvasRenderer, but modified to meet the + * needs of dygraphs. + * + * In particular, support for: + * - grid overlays + * - error bars + * - dygraphs attribute system + */ + +/** + * The DygraphCanvasRenderer class does the actual rendering of the chart onto + * a canvas. It's based on PlotKit.CanvasRenderer. + * @param {Object} element The canvas to attach to + * @param {Object} elementContext The 2d context of the canvas (injected so it + * can be mocked for testing.) + * @param {Layout} layout The DygraphLayout object for this graph. + * @constructor + */ + +/*jshint globalstrict: true */ +/*global Dygraph:false,RGBColor:false */ +"use strict"; + + +var DygraphCanvasRenderer = function(dygraph, element, elementContext, layout) { + this.dygraph_ = dygraph; + + this.layout = layout; + this.element = element; + this.elementContext = elementContext; + this.container = this.element.parentNode; + + this.height = this.element.height; + this.width = this.element.width; + + // --- check whether everything is ok before we return + if (!this.isIE && !(DygraphCanvasRenderer.isSupported(this.element))) + throw "Canvas is not supported."; + + // internal state + this.xlabels = []; + this.ylabels = []; + this.annotations = []; + this.chartLabels = {}; + + this.area = layout.getPlotArea(); + this.container.style.position = "relative"; + this.container.style.width = this.width + "px"; + + // Set up a clipping area for the canvas (and the interaction canvas). + // This ensures that we don't overdraw. + if (this.dygraph_.isUsingExcanvas_) { + this._createIEClipArea(); + } else { + // on Android 3 and 4, setting a clipping area on a canvas prevents it from + // displaying anything. + if (!Dygraph.isAndroid()) { + var ctx = this.dygraph_.canvas_ctx_; + ctx.beginPath(); + ctx.rect(this.area.x, this.area.y, this.area.w, this.area.h); + ctx.clip(); + + ctx = this.dygraph_.hidden_ctx_; + ctx.beginPath(); + ctx.rect(this.area.x, this.area.y, this.area.w, this.area.h); + ctx.clip(); + } + } +}; + +DygraphCanvasRenderer.prototype.attr_ = function(x) { + return this.dygraph_.attr_(x); +}; + +DygraphCanvasRenderer.prototype.clear = function() { + var context; + if (this.isIE) { + // VML takes a while to start up, so we just poll every this.IEDelay + try { + if (this.clearDelay) { + this.clearDelay.cancel(); + this.clearDelay = null; + } + context = this.elementContext; + } + catch (e) { + // TODO(danvk): this is broken, since MochiKit.Async is gone. + // this.clearDelay = MochiKit.Async.wait(this.IEDelay); + // this.clearDelay.addCallback(bind(this.clear, this)); + return; + } + } + + context = this.elementContext; + context.clearRect(0, 0, this.width, this.height); + + function removeArray(ary) { + for (var i = 0; i < ary.length; i++) { + var el = ary[i]; + if (el.parentNode) el.parentNode.removeChild(el); + } + } + + removeArray(this.xlabels); + removeArray(this.ylabels); + removeArray(this.annotations); + + for (var k in this.chartLabels) { + if (!this.chartLabels.hasOwnProperty(k)) continue; + var el = this.chartLabels[k]; + if (el.parentNode) el.parentNode.removeChild(el); + } + this.xlabels = []; + this.ylabels = []; + this.annotations = []; + this.chartLabels = {}; +}; + + +DygraphCanvasRenderer.isSupported = function(canvasName) { + var canvas = null; + try { + if (typeof(canvasName) == 'undefined' || canvasName === null) { + canvas = document.createElement("canvas"); + } else { + canvas = canvasName; + } + canvas.getContext("2d"); + } + catch (e) { + var ie = navigator.appVersion.match(/MSIE (\d\.\d)/); + var opera = (navigator.userAgent.toLowerCase().indexOf("opera") != -1); + if ((!ie) || (ie[1] < 6) || (opera)) + return false; + return true; + } + return true; +}; + +/** + * @param { [String] } colors Array of color strings. Should have one entry for + * each series to be rendered. + */ +DygraphCanvasRenderer.prototype.setColors = function(colors) { + this.colorScheme_ = colors; +}; + +/** + * Draw an X/Y grid on top of the existing plot + */ +DygraphCanvasRenderer.prototype.render = function() { + // Draw the new X/Y grid. Lines appear crisper when pixels are rounded to + // half-integers. This prevents them from drawing in two rows/cols. + var ctx = this.elementContext; + function halfUp(x) { return Math.round(x) + 0.5; } + function halfDown(y){ return Math.round(y) - 0.5; } + + if (this.attr_('underlayCallback')) { + // NOTE: we pass the dygraph object to this callback twice to avoid breaking + // users who expect a deprecated form of this callback. + this.attr_('underlayCallback')(ctx, this.area, this.dygraph_, this.dygraph_); + } + + var x, y, i, ticks; + if (this.attr_('drawYGrid')) { + ticks = this.layout.yticks; + // TODO(konigsberg): I don't think these calls to save() have a corresponding restore(). + ctx.save(); + ctx.strokeStyle = this.attr_('gridLineColor'); + ctx.lineWidth = this.attr_('gridLineWidth'); + for (i = 0; i < ticks.length; i++) { + // TODO(danvk): allow secondary axes to draw a grid, too. + if (ticks[i][0] !== 0) continue; + x = halfUp(this.area.x); + y = halfDown(this.area.y + ticks[i][1] * this.area.h); + ctx.beginPath(); + ctx.moveTo(x, y); + ctx.lineTo(x + this.area.w, y); + ctx.closePath(); + ctx.stroke(); + } + } + + if (this.attr_('drawXGrid')) { + ticks = this.layout.xticks; + ctx.save(); + ctx.strokeStyle = this.attr_('gridLineColor'); + ctx.lineWidth = this.attr_('gridLineWidth'); + for (i=0; i= 0; i--) { + if (graphDiv.childNodes[i].className == className) { + graphDiv.removeChild(graphDiv.childNodes[i]); + } + } + + // Determine background color to give clip divs. + var backgroundColor = document.bgColor; + var element = this.dygraph_.graphDiv; + while (element != document) { + var bgcolor = element.currentStyle.backgroundColor; + if (bgcolor && bgcolor != 'transparent') { + backgroundColor = bgcolor; + break; + } + element = element.parentNode; + } + + function createClipDiv(area) { + if (area.w === 0 || area.h === 0) { + return; + } + var elem = document.createElement('div'); + elem.className = className; + elem.style.backgroundColor = backgroundColor; + elem.style.position = 'absolute'; + elem.style.left = area.x + 'px'; + elem.style.top = area.y + 'px'; + elem.style.width = area.w + 'px'; + elem.style.height = area.h + 'px'; + graphDiv.appendChild(elem); + } + + var plotArea = this.area; + // Left side + createClipDiv({ + x:0, y:0, + w:plotArea.x, + h:this.height + }); + + // Top + createClipDiv({ + x: plotArea.x, y: 0, + w: this.width - plotArea.x, + h: plotArea.y + }); + + // Right side + createClipDiv({ + x: plotArea.x + plotArea.w, y: 0, + w: this.width-plotArea.x - plotArea.w, + h: this.height + }); + + // Bottom + createClipDiv({ + x: plotArea.x, + y: plotArea.y + plotArea.h, + w: this.width - plotArea.x, + h: this.height - plotArea.h - plotArea.y + }); +}; + +DygraphCanvasRenderer.prototype._renderAxis = function() { + if (!this.attr_('drawXAxis') && !this.attr_('drawYAxis')) return; + + // Round pixels to half-integer boundaries for crisper drawing. + function halfUp(x) { return Math.round(x) + 0.5; } + function halfDown(y){ return Math.round(y) - 0.5; } + + var context = this.elementContext; + + var label, x, y, tick, i; + + var labelStyle = { + position: "absolute", + fontSize: this.attr_('axisLabelFontSize') + "px", + zIndex: 10, + color: this.attr_('axisLabelColor'), + width: this.attr_('axisLabelWidth') + "px", + // height: this.attr_('axisLabelFontSize') + 2 + "px", + lineHeight: "normal", // Something other than "normal" line-height screws up label positioning. + overflow: "hidden" + }; + var makeDiv = function(txt, axis, prec_axis) { + var div = document.createElement("div"); + for (var name in labelStyle) { + if (labelStyle.hasOwnProperty(name)) { + div.style[name] = labelStyle[name]; + } + } + var inner_div = document.createElement("div"); + inner_div.className = 'dygraph-axis-label' + + ' dygraph-axis-label-' + axis + + (prec_axis ? ' dygraph-axis-label-' + prec_axis : ''); + inner_div.innerHTML=txt; + div.appendChild(inner_div); + return div; + }; + + // axis lines + context.save(); + context.strokeStyle = this.attr_('axisLineColor'); + context.lineWidth = this.attr_('axisLineWidth'); + + if (this.attr_('drawYAxis')) { + if (this.layout.yticks && this.layout.yticks.length > 0) { + var num_axes = this.dygraph_.numAxes(); + for (i = 0; i < this.layout.yticks.length; i++) { + tick = this.layout.yticks[i]; + if (typeof(tick) == "function") return; + x = this.area.x; + var sgn = 1; + var prec_axis = 'y1'; + if (tick[0] == 1) { // right-side y-axis + x = this.area.x + this.area.w; + sgn = -1; + prec_axis = 'y2'; + } + y = this.area.y + tick[1] * this.area.h; + + /* Tick marks are currently clipped, so don't bother drawing them. + context.beginPath(); + context.moveTo(halfUp(x), halfDown(y)); + context.lineTo(halfUp(x - sgn * this.attr_('axisTickSize')), halfDown(y)); + context.closePath(); + context.stroke(); + */ + + label = makeDiv(tick[2], 'y', num_axes == 2 ? prec_axis : null); + var top = (y - this.attr_('axisLabelFontSize') / 2); + if (top < 0) top = 0; + + if (top + this.attr_('axisLabelFontSize') + 3 > this.height) { + label.style.bottom = "0px"; + } else { + label.style.top = top + "px"; + } + if (tick[0] === 0) { + label.style.left = (this.area.x - this.attr_('yAxisLabelWidth') - this.attr_('axisTickSize')) + "px"; + label.style.textAlign = "right"; + } else if (tick[0] == 1) { + label.style.left = (this.area.x + this.area.w + + this.attr_('axisTickSize')) + "px"; + label.style.textAlign = "left"; + } + label.style.width = this.attr_('yAxisLabelWidth') + "px"; + this.container.appendChild(label); + this.ylabels.push(label); + } + + // The lowest tick on the y-axis often overlaps with the leftmost + // tick on the x-axis. Shift the bottom tick up a little bit to + // compensate if necessary. + var bottomTick = this.ylabels[0]; + var fontSize = this.attr_('axisLabelFontSize'); + var bottom = parseInt(bottomTick.style.top, 10) + fontSize; + if (bottom > this.height - fontSize) { + bottomTick.style.top = (parseInt(bottomTick.style.top, 10) - + fontSize / 2) + "px"; + } + } + + // draw a vertical line on the left to separate the chart from the labels. + context.beginPath(); + context.moveTo(halfUp(this.area.x), halfDown(this.area.y)); + context.lineTo(halfUp(this.area.x), halfDown(this.area.y + this.area.h)); + context.closePath(); + context.stroke(); + + // if there's a secondary y-axis, draw a vertical line for that, too. + if (this.dygraph_.numAxes() == 2) { + context.beginPath(); + context.moveTo(halfDown(this.area.x + this.area.w), halfDown(this.area.y)); + context.lineTo(halfDown(this.area.x + this.area.w), halfDown(this.area.y + this.area.h)); + context.closePath(); + context.stroke(); + } + } + + if (this.attr_('drawXAxis')) { + if (this.layout.xticks) { + for (i = 0; i < this.layout.xticks.length; i++) { + tick = this.layout.xticks[i]; + x = this.area.x + tick[0] * this.area.w; + y = this.area.y + this.area.h; + + /* Tick marks are currently clipped, so don't bother drawing them. + context.beginPath(); + context.moveTo(halfUp(x), halfDown(y)); + context.lineTo(halfUp(x), halfDown(y + this.attr_('axisTickSize'))); + context.closePath(); + context.stroke(); + */ + + label = makeDiv(tick[1], 'x'); + label.style.textAlign = "center"; + label.style.top = (y + this.attr_('axisTickSize')) + 'px'; + + var left = (x - this.attr_('axisLabelWidth')/2); + if (left + this.attr_('axisLabelWidth') > this.width) { + left = this.width - this.attr_('xAxisLabelWidth'); + label.style.textAlign = "right"; + } + if (left < 0) { + left = 0; + label.style.textAlign = "left"; + } + + label.style.left = left + "px"; + label.style.width = this.attr_('xAxisLabelWidth') + "px"; + this.container.appendChild(label); + this.xlabels.push(label); + } + } + + context.beginPath(); + context.moveTo(halfUp(this.area.x), halfDown(this.area.y + this.area.h)); + context.lineTo(halfUp(this.area.x + this.area.w), halfDown(this.area.y + this.area.h)); + context.closePath(); + context.stroke(); + } + + context.restore(); +}; + + +DygraphCanvasRenderer.prototype._renderChartLabels = function() { + var div, class_div; + + // Generate divs for the chart title, xlabel and ylabel. + // Space for these divs has already been taken away from the charting area in + // the DygraphCanvasRenderer constructor. + if (this.attr_('title')) { + div = document.createElement("div"); + div.style.position = 'absolute'; + div.style.top = '0px'; + div.style.left = this.area.x + 'px'; + div.style.width = this.area.w + 'px'; + div.style.height = this.attr_('titleHeight') + 'px'; + div.style.textAlign = 'center'; + div.style.fontSize = (this.attr_('titleHeight') - 8) + 'px'; + div.style.fontWeight = 'bold'; + class_div = document.createElement("div"); + class_div.className = 'dygraph-label dygraph-title'; + class_div.innerHTML = this.attr_('title'); + div.appendChild(class_div); + this.container.appendChild(div); + this.chartLabels.title = div; + } + + if (this.attr_('xlabel')) { + div = document.createElement("div"); + div.style.position = 'absolute'; + div.style.bottom = 0; // TODO(danvk): this is lazy. Calculate style.top. + div.style.left = this.area.x + 'px'; + div.style.width = this.area.w + 'px'; + div.style.height = this.attr_('xLabelHeight') + 'px'; + div.style.textAlign = 'center'; + div.style.fontSize = (this.attr_('xLabelHeight') - 2) + 'px'; + + class_div = document.createElement("div"); + class_div.className = 'dygraph-label dygraph-xlabel'; + class_div.innerHTML = this.attr_('xlabel'); + div.appendChild(class_div); + this.container.appendChild(div); + this.chartLabels.xlabel = div; + } + + var that = this; + function createRotatedDiv(axis, classes, html) { + var box = { + left: 0, + top: that.area.y, + width: that.attr_('yLabelWidth'), + height: that.area.h + }; + // TODO(danvk): is this outer div actually necessary? + div = document.createElement("div"); + div.style.position = 'absolute'; + if (axis == 1) { + div.style.left = box.left; + } else { + div.style.right = box.left; + } + div.style.top = box.top + 'px'; + div.style.width = box.width + 'px'; + div.style.height = box.height + 'px'; + div.style.fontSize = (that.attr_('yLabelWidth') - 2) + 'px'; + + var inner_div = document.createElement("div"); + inner_div.style.position = 'absolute'; + inner_div.style.width = box.height + 'px'; + inner_div.style.height = box.width + 'px'; + inner_div.style.top = (box.height / 2 - box.width / 2) + 'px'; + inner_div.style.left = (box.width / 2 - box.height / 2) + 'px'; + inner_div.style.textAlign = 'center'; + + // CSS rotation is an HTML5 feature which is not standardized. Hence every + // browser has its own name for the CSS style. + var val = 'rotate(' + (axis == 1 ? '-' : '') + '90deg)'; + inner_div.style.transform = val; // HTML5 + inner_div.style.WebkitTransform = val; // Safari/Chrome + inner_div.style.MozTransform = val; // Firefox + inner_div.style.OTransform = val; // Opera + inner_div.style.msTransform = val; // IE9 + + if (typeof(document.documentMode) !== 'undefined' && + document.documentMode < 9) { + // We're dealing w/ an old version of IE, so we have to rotate the text + // using a BasicImage transform. This uses a different origin of rotation + // than HTML5 rotation (top left of div vs. its center). + inner_div.style.filter = + 'progid:DXImageTransform.Microsoft.BasicImage(rotation=' + + (axis == 1 ? '3' : '1') + ')'; + inner_div.style.left = '0px'; + inner_div.style.top = '0px'; + } + + class_div = document.createElement("div"); + class_div.className = classes; + class_div.innerHTML = html; + + inner_div.appendChild(class_div); + div.appendChild(inner_div); + return div; + } + + var div; + if (this.attr_('ylabel')) { + div = createRotatedDiv(1, 'dygraph-label dygraph-ylabel', + this.attr_('ylabel')); + this.container.appendChild(div); + this.chartLabels.ylabel = div; + } + if (this.attr_('y2label') && this.dygraph_.numAxes() == 2) { + div = createRotatedDiv(2, 'dygraph-label dygraph-y2label', + this.attr_('y2label')); + this.container.appendChild(div); + this.chartLabels.y2label = div; + } +}; + + +DygraphCanvasRenderer.prototype._renderAnnotations = function() { + var annotationStyle = { + "position": "absolute", + "fontSize": this.attr_('axisLabelFontSize') + "px", + "zIndex": 10, + "overflow": "hidden" + }; + + var bindEvt = function(eventName, classEventName, p, self) { + return function(e) { + var a = p.annotation; + if (a.hasOwnProperty(eventName)) { + a[eventName](a, p, self.dygraph_, e); + } else if (self.dygraph_.attr_(classEventName)) { + self.dygraph_.attr_(classEventName)(a, p, self.dygraph_,e ); + } + }; + }; + + // Get a list of point with annotations. + var points = this.layout.annotated_points; + for (var i = 0; i < points.length; i++) { + var p = points[i]; + if (p.canvasx < this.area.x || p.canvasx > this.area.x + this.area.w) { + continue; + } + + var a = p.annotation; + var tick_height = 6; + if (a.hasOwnProperty("tickHeight")) { + tick_height = a.tickHeight; + } + + var div = document.createElement("div"); + for (var name in annotationStyle) { + if (annotationStyle.hasOwnProperty(name)) { + div.style[name] = annotationStyle[name]; + } + } + if (!a.hasOwnProperty('icon')) { + div.className = "dygraphDefaultAnnotation"; + } + if (a.hasOwnProperty('cssClass')) { + div.className += " " + a.cssClass; + } + + var width = a.hasOwnProperty('width') ? a.width : 16; + var height = a.hasOwnProperty('height') ? a.height : 16; + if (a.hasOwnProperty('icon')) { + var img = document.createElement("img"); + img.src = a.icon; + img.width = width; + img.height = height; + div.appendChild(img); + } else if (p.annotation.hasOwnProperty('shortText')) { + div.appendChild(document.createTextNode(p.annotation.shortText)); + } + div.style.left = (p.canvasx - width / 2) + "px"; + if (a.attachAtBottom) { + div.style.top = (this.area.h - height - tick_height) + "px"; + } else { + div.style.top = (p.canvasy - height - tick_height) + "px"; + } + div.style.width = width + "px"; + div.style.height = height + "px"; + div.title = p.annotation.text; + div.style.color = this.colors[p.name]; + div.style.borderColor = this.colors[p.name]; + a.div = div; + + Dygraph.addEvent(div, 'click', + bindEvt('clickHandler', 'annotationClickHandler', p, this)); + Dygraph.addEvent(div, 'mouseover', + bindEvt('mouseOverHandler', 'annotationMouseOverHandler', p, this)); + Dygraph.addEvent(div, 'mouseout', + bindEvt('mouseOutHandler', 'annotationMouseOutHandler', p, this)); + Dygraph.addEvent(div, 'dblclick', + bindEvt('dblClickHandler', 'annotationDblClickHandler', p, this)); + + this.container.appendChild(div); + this.annotations.push(div); + + var ctx = this.elementContext; + ctx.strokeStyle = this.colors[p.name]; + ctx.beginPath(); + if (!a.attachAtBottom) { + ctx.moveTo(p.canvasx, p.canvasy); + ctx.lineTo(p.canvasx, p.canvasy - 2 - tick_height); + } else { + ctx.moveTo(p.canvasx, this.area.h); + ctx.lineTo(p.canvasx, this.area.h - 2 - tick_height); + } + ctx.closePath(); + ctx.stroke(); + } +}; + + +/** + * Actually draw the lines chart, including error bars. + * TODO(danvk): split this into several smaller functions. + * @private + */ +DygraphCanvasRenderer.prototype._renderLineChart = function() { + var isNullOrNaN = function(x) { + return (x === null || isNaN(x)); + }; + + // TODO(danvk): use this.attr_ for many of these. + var context = this.elementContext; + var fillAlpha = this.attr_('fillAlpha'); + var errorBars = this.attr_("errorBars") || this.attr_("customBars"); + var fillGraph = this.attr_("fillGraph"); + var stackedGraph = this.attr_("stackedGraph"); + var stepPlot = this.attr_("stepPlot"); + var points = this.layout.points; + var pointsLength = points.length; + var point, i, j, prevX, prevY, prevYs, color, setName, newYs, err_color, rgb, yscale, axis; + + var setNames = []; + for (var name in this.layout.datasets) { + if (this.layout.datasets.hasOwnProperty(name)) { + setNames.push(name); + } + } + var setCount = setNames.length; + + // TODO(danvk): Move this mapping into Dygraph and get it out of here. + this.colors = {}; + for (i = 0; i < setCount; i++) { + this.colors[setNames[i]] = this.colorScheme_[i % this.colorScheme_.length]; + } + + // Update Points + // TODO(danvk): here + for (i = pointsLength; i--;) { + point = points[i]; + point.canvasx = this.area.w * point.x + this.area.x; + point.canvasy = this.area.h * point.y + this.area.y; + } + + // create paths + var ctx = context; + if (errorBars) { + if (fillGraph) { + this.dygraph_.warn("Can't use fillGraph option with error bars"); + } + + for (i = 0; i < setCount; i++) { + setName = setNames[i]; + axis = this.dygraph_.axisPropertiesForSeries(setName); + color = this.colors[setName]; + + // setup graphics context + ctx.save(); + prevX = NaN; + prevY = NaN; + prevYs = [-1, -1]; + yscale = axis.yscale; + // should be same color as the lines but only 15% opaque. + rgb = new RGBColor(color); + err_color = 'rgba(' + rgb.r + ',' + rgb.g + ',' + rgb.b + ',' + + fillAlpha + ')'; + ctx.fillStyle = err_color; + ctx.beginPath(); + for (j = 0; j < pointsLength; j++) { + point = points[j]; + if (point.name == setName) { + if (!Dygraph.isOK(point.y)) { + prevX = NaN; + continue; + } + + // TODO(danvk): here + if (stepPlot) { + newYs = [ point.y_bottom, point.y_top ]; + prevY = point.y; + } else { + newYs = [ point.y_bottom, point.y_top ]; + } + newYs[0] = this.area.h * newYs[0] + this.area.y; + newYs[1] = this.area.h * newYs[1] + this.area.y; + if (!isNaN(prevX)) { + if (stepPlot) { + ctx.moveTo(prevX, newYs[0]); + } else { + ctx.moveTo(prevX, prevYs[0]); + } + ctx.lineTo(point.canvasx, newYs[0]); + ctx.lineTo(point.canvasx, newYs[1]); + if (stepPlot) { + ctx.lineTo(prevX, newYs[1]); + } else { + ctx.lineTo(prevX, prevYs[1]); + } + ctx.closePath(); + } + prevYs = newYs; + prevX = point.canvasx; + } + } + ctx.fill(); + } + } else if (fillGraph) { + var baseline = []; // for stacked graphs: baseline for filling + + // process sets in reverse order (needed for stacked graphs) + for (i = setCount - 1; i >= 0; i--) { + setName = setNames[i]; + color = this.colors[setName]; + axis = this.dygraph_.axisPropertiesForSeries(setName); + var axisY = 1.0 + axis.minyval * axis.yscale; + if (axisY < 0.0) axisY = 0.0; + else if (axisY > 1.0) axisY = 1.0; + axisY = this.area.h * axisY + this.area.y; + + // setup graphics context + ctx.save(); + prevX = NaN; + prevYs = [-1, -1]; + yscale = axis.yscale; + // should be same color as the lines but only 15% opaque. + rgb = new RGBColor(color); + err_color = 'rgba(' + rgb.r + ',' + rgb.g + ',' + rgb.b + ',' + + fillAlpha + ')'; + ctx.fillStyle = err_color; + ctx.beginPath(); + for (j = 0; j < pointsLength; j++) { + point = points[j]; + if (point.name == setName) { + if (!Dygraph.isOK(point.y)) { + prevX = NaN; + continue; + } + if (stackedGraph) { + var lastY = baseline[point.canvasx]; + if (lastY === undefined) lastY = axisY; + baseline[point.canvasx] = point.canvasy; + newYs = [ point.canvasy, lastY ]; + } else { + newYs = [ point.canvasy, axisY ]; + } + if (!isNaN(prevX)) { + ctx.moveTo(prevX, prevYs[0]); + if (stepPlot) { + ctx.lineTo(point.canvasx, prevYs[0]); + } else { + ctx.lineTo(point.canvasx, newYs[0]); + } + ctx.lineTo(point.canvasx, newYs[1]); + ctx.lineTo(prevX, prevYs[1]); + ctx.closePath(); + } + prevYs = newYs; + prevX = point.canvasx; + } + } + ctx.fill(); + } + } + + // Drawing the lines. + var firstIndexInSet = 0; + var afterLastIndexInSet = 0; + var setLength = 0; + for (i = 0; i < setCount; i += 1) { + setLength = this.layout.setPointsLengths[i]; + afterLastIndexInSet += setLength; + setName = setNames[i]; + color = this.colors[setName]; + var strokeWidth = this.dygraph_.attr_("strokeWidth", setName); + + // setup graphics context + context.save(); + var pointSize = this.dygraph_.attr_("pointSize", setName); + prevX = null; + prevY = null; + var drawPoints = this.dygraph_.attr_("drawPoints", setName); + var strokePattern = this.dygraph_.attr_("strokePattern", setName); + if (!Dygraph.isArrayLike(strokePattern)) { + strokePattern = null; + } + for (j = firstIndexInSet; j < afterLastIndexInSet; j++) { + point = points[j]; + if (isNullOrNaN(point.canvasy)) { + if (stepPlot && prevX !== null) { + // Draw a horizontal line to the start of the missing data + ctx.beginPath(); + ctx.strokeStyle = color; + ctx.lineWidth = this.attr_('strokeWidth'); + this._dashedLine(ctx, prevX, prevY, point.canvasx, prevY, strokePattern); + ctx.stroke(); + } + // this will make us move to the next point, not draw a line to it. + prevX = prevY = null; + } else { + // A point is "isolated" if it is non-null but both the previous + // and next points are null. + var isIsolated = (!prevX && (j == points.length - 1 || + isNullOrNaN(points[j+1].canvasy))); + if (prevX === null) { + prevX = point.canvasx; + prevY = point.canvasy; + } else { + // Skip over points that will be drawn in the same pixel. + if (Math.round(prevX) == Math.round(point.canvasx) && + Math.round(prevY) == Math.round(point.canvasy)) { + continue; + } + // TODO(antrob): skip over points that lie on a line that is already + // going to be drawn. There is no need to have more than 2 + // consecutive points that are collinear. + if (strokeWidth) { + ctx.beginPath(); + ctx.strokeStyle = color; + ctx.lineWidth = strokeWidth; + if (stepPlot) { + this._dashedLine(ctx, prevX, prevY, point.canvasx, prevY, strokePattern); + } + this._dashedLine(ctx, prevX, prevY, point.canvasx, point.canvasy, strokePattern); + prevX = point.canvasx; + prevY = point.canvasy; + ctx.stroke(); + } + } + + if (drawPoints || isIsolated) { + ctx.beginPath(); + ctx.fillStyle = color; + ctx.arc(point.canvasx, point.canvasy, pointSize, + 0, 2 * Math.PI, false); + ctx.fill(); + } + } + } + firstIndexInSet = afterLastIndexInSet; + } + + context.restore(); +}; + +/** + * This does dashed lines onto a canvas for a given pattern. You must call + * ctx.stroke() after to actually draw it, much line ctx.lineTo(). It remembers + * the state of the line in regards to where we left off on drawing the pattern. + * You can draw a dashed line in several function calls and the pattern will be + * continous as long as you didn't call this function with a different pattern + * in between. + * @param ctx The canvas 2d context to draw on. + * @param x The start of the line's x coordinate. + * @param y The start of the line's y coordinate. + * @param x2 The end of the line's x coordinate. + * @param y2 The end of the line's y coordinate. + * @param pattern The dash pattern to draw, an array of integers where even + * index is drawn and odd index is not drawn (Ex. [10, 2, 5, 2], 10 is drawn 5 + * is drawn, 2 is the space between.). A null pattern, array of length one, or + * empty array will do just a solid line. + * @private + */ +DygraphCanvasRenderer.prototype._dashedLine = function(ctx, x, y, x2, y2, pattern) { + // Original version http://stackoverflow.com/questions/4576724/dotted-stroke-in-canvas + // Modified by Russell Valentine to keep line history and continue the pattern + // where it left off. + var dx, dy, len, rot, patternIndex, segment; + + // If we don't have a pattern or it is an empty array or of size one just + // do a solid line. + if (!pattern || pattern.length <= 1) { + ctx.moveTo(x, y); + ctx.lineTo(x2, y2); + return; + } + + // If we have a different dash pattern than the last time this was called we + // reset our dash history and start the pattern from the begging + // regardless of state of the last pattern. + if (!Dygraph.compareArrays(pattern, this._dashedLineToHistoryPattern)) { + this._dashedLineToHistoryPattern = pattern; + this._dashedLineToHistory = [0, 0]; + } + ctx.save(); + + // Calculate transformation parameters + dx = (x2-x); + dy = (y2-y); + len = Math.sqrt(dx*dx + dy*dy); + rot = Math.atan2(dy, dx); + + // Set transformation + ctx.translate(x, y); + ctx.moveTo(0, 0); + ctx.rotate(rot); + + // Set last pattern index we used for this pattern. + patternIndex = this._dashedLineToHistory[0]; + x = 0; + while (len > x) { + // Get the length of the pattern segment we are dealing with. + segment = pattern[patternIndex]; + // If our last draw didn't complete the pattern segment all the way we + // will try to finish it. Otherwise we will try to do the whole segment. + if (this._dashedLineToHistory[1]) { + x += this._dashedLineToHistory[1]; + } else { + x += segment; + } + if (x > len) { + // We were unable to complete this pattern index all the way, keep + // where we are the history so our next draw continues where we left off + // in the pattern. + this._dashedLineToHistory = [patternIndex, x-len]; + x = len; + } else { + // We completed this patternIndex, we put in the history that we are on + // the beginning of the next segment. + this._dashedLineToHistory = [(patternIndex+1)%pattern.length, 0]; + } + + // We do a line on a even pattern index and just move on a odd pattern index. + // The move is the empty space in the dash. + if(patternIndex % 2 === 0) { + ctx.lineTo(x, 0); + } else { + ctx.moveTo(x, 0); + } + // If we are not done, next loop process the next pattern segment, or the + // first segment again if we are at the end of the pattern. + patternIndex = (patternIndex+1) % pattern.length; + } + ctx.restore(); +}; +/** + * @license + * Copyright 2006 Dan Vanderkam (danvdk@gmail.com) + * MIT-licensed (http://opensource.org/licenses/MIT) + */ + +/** + * @fileoverview Creates an interactive, zoomable graph based on a CSV file or + * string. Dygraph can handle multiple series with or without error bars. The + * date/value ranges will be automatically set. Dygraph uses the + * <canvas> tag, so it only works in FF1.5+. + * @author danvdk@gmail.com (Dan Vanderkam) + + Usage: +
+ + + The CSV file is of the form + + Date,SeriesA,SeriesB,SeriesC + YYYYMMDD,A1,B1,C1 + YYYYMMDD,A2,B2,C2 + + If the 'errorBars' option is set in the constructor, the input should be of + the form + Date,SeriesA,SeriesB,... + YYYYMMDD,A1,sigmaA1,B1,sigmaB1,... + YYYYMMDD,A2,sigmaA2,B2,sigmaB2,... + + If the 'fractions' option is set, the input should be of the form: + + Date,SeriesA,SeriesB,... + YYYYMMDD,A1/B1,A2/B2,... + YYYYMMDD,A1/B1,A2/B2,... + + And error bars will be calculated automatically using a binomial distribution. + + For further documentation and examples, see http://dygraphs.com/ + + */ + +/*jshint globalstrict: true */ +/*global DygraphRangeSelector:false, DygraphLayout:false, DygraphCanvasRenderer:false, G_vmlCanvasManager:false */ +"use strict"; + +/** + * Creates an interactive, zoomable chart. + * + * @constructor + * @param {div | String} div A div or the id of a div into which to construct + * the chart. + * @param {String | Function} file A file containing CSV data or a function + * that returns this data. The most basic expected format for each line is + * "YYYY/MM/DD,val1,val2,...". For more information, see + * http://dygraphs.com/data.html. + * @param {Object} attrs Various other attributes, e.g. errorBars determines + * whether the input data contains error ranges. For a complete list of + * options, see http://dygraphs.com/options.html. + */ +var Dygraph = function(div, data, opts) { + if (arguments.length > 0) { + if (arguments.length == 4) { + // Old versions of dygraphs took in the series labels as a constructor + // parameter. This doesn't make sense anymore, but it's easy to continue + // to support this usage. + this.warn("Using deprecated four-argument dygraph constructor"); + this.__old_init__(div, data, arguments[2], arguments[3]); + } else { + this.__init__(div, data, opts); + } + } +}; + +Dygraph.NAME = "Dygraph"; +Dygraph.VERSION = "1.2"; +Dygraph.__repr__ = function() { + return "[" + this.NAME + " " + this.VERSION + "]"; +}; + +/** + * Returns information about the Dygraph class. + */ +Dygraph.toString = function() { + return this.__repr__(); +}; + +// Various default values +Dygraph.DEFAULT_ROLL_PERIOD = 1; +Dygraph.DEFAULT_WIDTH = 480; +Dygraph.DEFAULT_HEIGHT = 320; + +Dygraph.ANIMATION_STEPS = 10; +Dygraph.ANIMATION_DURATION = 200; + +// These are defined before DEFAULT_ATTRS so that it can refer to them. +/** + * @private + * Return a string version of a number. This respects the digitsAfterDecimal + * and maxNumberWidth options. + * @param {Number} x The number to be formatted + * @param {Dygraph} opts An options view + * @param {String} name The name of the point's data series + * @param {Dygraph} g The dygraph object + */ +Dygraph.numberValueFormatter = function(x, opts, pt, g) { + var sigFigs = opts('sigFigs'); + + if (sigFigs !== null) { + // User has opted for a fixed number of significant figures. + return Dygraph.floatFormat(x, sigFigs); + } + + var digits = opts('digitsAfterDecimal'); + var maxNumberWidth = opts('maxNumberWidth'); + + // switch to scientific notation if we underflow or overflow fixed display. + if (x !== 0.0 && + (Math.abs(x) >= Math.pow(10, maxNumberWidth) || + Math.abs(x) < Math.pow(10, -digits))) { + return x.toExponential(digits); + } else { + return '' + Dygraph.round_(x, digits); + } +}; + +/** + * variant for use as an axisLabelFormatter. + * @private + */ +Dygraph.numberAxisLabelFormatter = function(x, granularity, opts, g) { + return Dygraph.numberValueFormatter(x, opts, g); +}; + +/** + * Convert a JS date (millis since epoch) to YYYY/MM/DD + * @param {Number} date The JavaScript date (ms since epoch) + * @return {String} A date of the form "YYYY/MM/DD" + * @private + */ +Dygraph.dateString_ = function(date) { + var zeropad = Dygraph.zeropad; + var d = new Date(date); + + // Get the year: + var year = "" + d.getFullYear(); + // Get a 0 padded month string + var month = zeropad(d.getMonth() + 1); //months are 0-offset, sigh + // Get a 0 padded day string + var day = zeropad(d.getDate()); + + var ret = ""; + var frac = d.getHours() * 3600 + d.getMinutes() * 60 + d.getSeconds(); + if (frac) ret = " " + Dygraph.hmsString_(date); + + return year + "/" + month + "/" + day + ret; +}; + +/** + * Convert a JS date to a string appropriate to display on an axis that + * is displaying values at the stated granularity. + * @param {Date} date The date to format + * @param {Number} granularity One of the Dygraph granularity constants + * @return {String} The formatted date + * @private + */ +Dygraph.dateAxisFormatter = function(date, granularity) { + if (granularity >= Dygraph.DECADAL) { + return date.strftime('%Y'); + } else if (granularity >= Dygraph.MONTHLY) { + return date.strftime('%b %y'); + } else { + var frac = date.getHours() * 3600 + date.getMinutes() * 60 + date.getSeconds() + date.getMilliseconds(); + if (frac === 0 || granularity >= Dygraph.DAILY) { + return new Date(date.getTime() + 3600*1000).strftime('%d%b'); + } else { + return Dygraph.hmsString_(date.getTime()); + } + } +}; + + +// Default attribute values. +Dygraph.DEFAULT_ATTRS = { + highlightCircleSize: 3, + + labelsDivWidth: 250, + labelsDivStyles: { + // TODO(danvk): move defaults from createStatusMessage_ here. + }, + labelsSeparateLines: false, + labelsShowZeroValues: true, + labelsKMB: false, + labelsKMG2: false, + showLabelsOnHighlight: true, + + digitsAfterDecimal: 2, + maxNumberWidth: 6, + sigFigs: null, + + strokeWidth: 1.0, + + axisTickSize: 3, + axisLabelFontSize: 14, + xAxisLabelWidth: 50, + yAxisLabelWidth: 50, + rightGap: 5, + + showRoller: false, + xValueParser: Dygraph.dateParser, + + delimiter: ',', + + sigma: 2.0, + errorBars: false, + fractions: false, + wilsonInterval: true, // only relevant if fractions is true + customBars: false, + fillGraph: false, + fillAlpha: 0.15, + connectSeparatedPoints: false, + + stackedGraph: false, + hideOverlayOnMouseOut: true, + + // TODO(danvk): support 'onmouseover' and 'never', and remove synonyms. + legend: 'onmouseover', // the only relevant value at the moment is 'always'. + + stepPlot: false, + avoidMinZero: false, + + // Sizes of the various chart labels. + titleHeight: 28, + xLabelHeight: 18, + yLabelWidth: 18, + + drawXAxis: true, + drawYAxis: true, + axisLineColor: "black", + axisLineWidth: 0.3, + gridLineWidth: 0.3, + axisLabelColor: "black", + axisLabelFont: "Arial", // TODO(danvk): is this implemented? + axisLabelWidth: 50, + drawYGrid: true, + drawXGrid: true, + gridLineColor: "rgb(128,128,128)", + + interactionModel: null, // will be set to Dygraph.Interaction.defaultModel + animatedZooms: false, // (for now) + + // Range selector options + showRangeSelector: false, + rangeSelectorHeight: 40, + rangeSelectorPlotStrokeColor: "#808FAB", + rangeSelectorPlotFillColor: "#A7B1C4", + + // per-axis options + axes: { + x: { + pixelsPerLabel: 60, + axisLabelFormatter: Dygraph.dateAxisFormatter, + valueFormatter: Dygraph.dateString_, + ticker: null // will be set in dygraph-tickers.js + }, + y: { + pixelsPerLabel: 30, + valueFormatter: Dygraph.numberValueFormatter, + axisLabelFormatter: Dygraph.numberAxisLabelFormatter, + ticker: null // will be set in dygraph-tickers.js + }, + y2: { + pixelsPerLabel: 30, + valueFormatter: Dygraph.numberValueFormatter, + axisLabelFormatter: Dygraph.numberAxisLabelFormatter, + ticker: null // will be set in dygraph-tickers.js + } + } +}; + +// Directions for panning and zooming. Use bit operations when combined +// values are possible. +Dygraph.HORIZONTAL = 1; +Dygraph.VERTICAL = 2; + +// Used for initializing annotation CSS rules only once. +Dygraph.addedAnnotationCSS = false; + +Dygraph.prototype.__old_init__ = function(div, file, labels, attrs) { + // Labels is no longer a constructor parameter, since it's typically set + // directly from the data source. It also conains a name for the x-axis, + // which the previous constructor form did not. + if (labels !== null) { + var new_labels = ["Date"]; + for (var i = 0; i < labels.length; i++) new_labels.push(labels[i]); + Dygraph.update(attrs, { 'labels': new_labels }); + } + this.__init__(div, file, attrs); +}; + +/** + * Initializes the Dygraph. This creates a new DIV and constructs the PlotKit + * and context <canvas> inside of it. See the constructor for details. + * on the parameters. + * @param {Element} div the Element to render the graph into. + * @param {String | Function} file Source data + * @param {Object} attrs Miscellaneous other options + * @private + */ +Dygraph.prototype.__init__ = function(div, file, attrs) { + // Hack for IE: if we're using excanvas and the document hasn't finished + // loading yet (and hence may not have initialized whatever it needs to + // initialize), then keep calling this routine periodically until it has. + if (/MSIE/.test(navigator.userAgent) && !window.opera && + typeof(G_vmlCanvasManager) != 'undefined' && + document.readyState != 'complete') { + var self = this; + setTimeout(function() { self.__init__(div, file, attrs); }, 100); + return; + } + + // Support two-argument constructor + if (attrs === null || attrs === undefined) { attrs = {}; } + + attrs = Dygraph.mapLegacyOptions_(attrs); + + if (!div) { + Dygraph.error("Constructing dygraph with a non-existent div!"); + return; + } + + this.isUsingExcanvas_ = typeof(G_vmlCanvasManager) != 'undefined'; + + // Copy the important bits into the object + // TODO(danvk): most of these should just stay in the attrs_ dictionary. + this.maindiv_ = div; + this.file_ = file; + this.rollPeriod_ = attrs.rollPeriod || Dygraph.DEFAULT_ROLL_PERIOD; + this.previousVerticalX_ = -1; + this.fractions_ = attrs.fractions || false; + this.dateWindow_ = attrs.dateWindow || null; + + this.is_initial_draw_ = true; + this.annotations_ = []; + + // Zoomed indicators - These indicate when the graph has been zoomed and on what axis. + this.zoomed_x_ = false; + this.zoomed_y_ = false; + + // Clear the div. This ensure that, if multiple dygraphs are passed the same + // div, then only one will be drawn. + div.innerHTML = ""; + + // For historical reasons, the 'width' and 'height' options trump all CSS + // rules _except_ for an explicit 'width' or 'height' on the div. + // As an added convenience, if the div has zero height (like
does + // without any styles), then we use a default height/width. + if (div.style.width === '' && attrs.width) { + div.style.width = attrs.width + "px"; + } + if (div.style.height === '' && attrs.height) { + div.style.height = attrs.height + "px"; + } + if (div.style.height === '' && div.clientHeight === 0) { + div.style.height = Dygraph.DEFAULT_HEIGHT + "px"; + if (div.style.width === '') { + div.style.width = Dygraph.DEFAULT_WIDTH + "px"; + } + } + // these will be zero if the dygraph's div is hidden. + this.width_ = div.clientWidth; + this.height_ = div.clientHeight; + + // TODO(danvk): set fillGraph to be part of attrs_ here, not user_attrs_. + if (attrs.stackedGraph) { + attrs.fillGraph = true; + // TODO(nikhilk): Add any other stackedGraph checks here. + } + + // Dygraphs has many options, some of which interact with one another. + // To keep track of everything, we maintain two sets of options: + // + // this.user_attrs_ only options explicitly set by the user. + // this.attrs_ defaults, options derived from user_attrs_, data. + // + // Options are then accessed this.attr_('attr'), which first looks at + // user_attrs_ and then computed attrs_. This way Dygraphs can set intelligent + // defaults without overriding behavior that the user specifically asks for. + this.user_attrs_ = {}; + Dygraph.update(this.user_attrs_, attrs); + + // This sequence ensures that Dygraph.DEFAULT_ATTRS is never modified. + this.attrs_ = {}; + Dygraph.updateDeep(this.attrs_, Dygraph.DEFAULT_ATTRS); + + this.boundaryIds_ = []; + + // Create the containing DIV and other interactive elements + this.createInterface_(); + + this.start_(); +}; + +/** + * Returns the zoomed status of the chart for one or both axes. + * + * Axis is an optional parameter. Can be set to 'x' or 'y'. + * + * The zoomed status for an axis is set whenever a user zooms using the mouse + * or when the dateWindow or valueRange are updated (unless the isZoomedIgnoreProgrammaticZoom + * option is also specified). + */ +Dygraph.prototype.isZoomed = function(axis) { + if (axis == null) return this.zoomed_x_ || this.zoomed_y_; + if (axis === 'x') return this.zoomed_x_; + if (axis === 'y') return this.zoomed_y_; + throw "axis parameter is [" + axis + "] must be null, 'x' or 'y'."; +}; + +/** + * Returns information about the Dygraph object, including its containing ID. + */ +Dygraph.prototype.toString = function() { + var maindiv = this.maindiv_; + var id = (maindiv && maindiv.id) ? maindiv.id : maindiv; + return "[Dygraph " + id + "]"; +}; + +/** + * @private + * Returns the value of an option. This may be set by the user (either in the + * constructor or by calling updateOptions) or by dygraphs, and may be set to a + * per-series value. + * @param { String } name The name of the option, e.g. 'rollPeriod'. + * @param { String } [seriesName] The name of the series to which the option + * will be applied. If no per-series value of this option is available, then + * the global value is returned. This is optional. + * @return { ... } The value of the option. + */ +Dygraph.prototype.attr_ = function(name, seriesName) { + if (seriesName && + typeof(this.user_attrs_[seriesName]) != 'undefined' && + this.user_attrs_[seriesName] !== null && + typeof(this.user_attrs_[seriesName][name]) != 'undefined') { + return this.user_attrs_[seriesName][name]; + } else if (typeof(this.user_attrs_[name]) != 'undefined') { + return this.user_attrs_[name]; + } else if (typeof(this.attrs_[name]) != 'undefined') { + return this.attrs_[name]; + } else { + return null; + } +}; + +/** + * @private + * @param String} axis The name of the axis (i.e. 'x', 'y' or 'y2') + * @return { ... } A function mapping string -> option value + */ +Dygraph.prototype.optionsViewForAxis_ = function(axis) { + var self = this; + return function(opt) { + var axis_opts = self.user_attrs_.axes; + if (axis_opts && axis_opts[axis] && axis_opts[axis][opt]) { + return axis_opts[axis][opt]; + } + // user-specified attributes always trump defaults, even if they're less + // specific. + if (typeof(self.user_attrs_[opt]) != 'undefined') { + return self.user_attrs_[opt]; + } + + axis_opts = self.attrs_.axes; + if (axis_opts && axis_opts[axis] && axis_opts[axis][opt]) { + return axis_opts[axis][opt]; + } + // check old-style axis options + // TODO(danvk): add a deprecation warning if either of these match. + if (axis == 'y' && self.axes_[0].hasOwnProperty(opt)) { + return self.axes_[0][opt]; + } else if (axis == 'y2' && self.axes_[1].hasOwnProperty(opt)) { + return self.axes_[1][opt]; + } + return self.attr_(opt); + }; +}; + +/** + * Returns the current rolling period, as set by the user or an option. + * @return {Number} The number of points in the rolling window + */ +Dygraph.prototype.rollPeriod = function() { + return this.rollPeriod_; +}; + +/** + * Returns the currently-visible x-range. This can be affected by zooming, + * panning or a call to updateOptions. + * Returns a two-element array: [left, right]. + * If the Dygraph has dates on the x-axis, these will be millis since epoch. + */ +Dygraph.prototype.xAxisRange = function() { + return this.dateWindow_ ? this.dateWindow_ : this.xAxisExtremes(); +}; + +/** + * Returns the lower- and upper-bound x-axis values of the + * data set. + */ +Dygraph.prototype.xAxisExtremes = function() { + var left = this.rawData_[0][0]; + var right = this.rawData_[this.rawData_.length - 1][0]; + return [left, right]; +}; + +/** + * Returns the currently-visible y-range for an axis. This can be affected by + * zooming, panning or a call to updateOptions. Axis indices are zero-based. If + * called with no arguments, returns the range of the first axis. + * Returns a two-element array: [bottom, top]. + */ +Dygraph.prototype.yAxisRange = function(idx) { + if (typeof(idx) == "undefined") idx = 0; + if (idx < 0 || idx >= this.axes_.length) { + return null; + } + var axis = this.axes_[idx]; + return [ axis.computedValueRange[0], axis.computedValueRange[1] ]; +}; + +/** + * Returns the currently-visible y-ranges for each axis. This can be affected by + * zooming, panning, calls to updateOptions, etc. + * Returns an array of [bottom, top] pairs, one for each y-axis. + */ +Dygraph.prototype.yAxisRanges = function() { + var ret = []; + for (var i = 0; i < this.axes_.length; i++) { + ret.push(this.yAxisRange(i)); + } + return ret; +}; + +// TODO(danvk): use these functions throughout dygraphs. +/** + * Convert from data coordinates to canvas/div X/Y coordinates. + * If specified, do this conversion for the coordinate system of a particular + * axis. Uses the first axis by default. + * Returns a two-element array: [X, Y] + * + * Note: use toDomXCoord instead of toDomCoords(x, null) and use toDomYCoord + * instead of toDomCoords(null, y, axis). + */ +Dygraph.prototype.toDomCoords = function(x, y, axis) { + return [ this.toDomXCoord(x), this.toDomYCoord(y, axis) ]; +}; + +/** + * Convert from data x coordinates to canvas/div X coordinate. + * If specified, do this conversion for the coordinate system of a particular + * axis. + * Returns a single value or null if x is null. + */ +Dygraph.prototype.toDomXCoord = function(x) { + if (x === null) { + return null; + } + + var area = this.plotter_.area; + var xRange = this.xAxisRange(); + return area.x + (x - xRange[0]) / (xRange[1] - xRange[0]) * area.w; +}; + +/** + * Convert from data x coordinates to canvas/div Y coordinate and optional + * axis. Uses the first axis by default. + * + * returns a single value or null if y is null. + */ +Dygraph.prototype.toDomYCoord = function(y, axis) { + var pct = this.toPercentYCoord(y, axis); + + if (pct === null) { + return null; + } + var area = this.plotter_.area; + return area.y + pct * area.h; +}; + +/** + * Convert from canvas/div coords to data coordinates. + * If specified, do this conversion for the coordinate system of a particular + * axis. Uses the first axis by default. + * Returns a two-element array: [X, Y]. + * + * Note: use toDataXCoord instead of toDataCoords(x, null) and use toDataYCoord + * instead of toDataCoords(null, y, axis). + */ +Dygraph.prototype.toDataCoords = function(x, y, axis) { + return [ this.toDataXCoord(x), this.toDataYCoord(y, axis) ]; +}; + +/** + * Convert from canvas/div x coordinate to data coordinate. + * + * If x is null, this returns null. + */ +Dygraph.prototype.toDataXCoord = function(x) { + if (x === null) { + return null; + } + + var area = this.plotter_.area; + var xRange = this.xAxisRange(); + return xRange[0] + (x - area.x) / area.w * (xRange[1] - xRange[0]); +}; + +/** + * Convert from canvas/div y coord to value. + * + * If y is null, this returns null. + * if axis is null, this uses the first axis. + */ +Dygraph.prototype.toDataYCoord = function(y, axis) { + if (y === null) { + return null; + } + + var area = this.plotter_.area; + var yRange = this.yAxisRange(axis); + + if (typeof(axis) == "undefined") axis = 0; + if (!this.axes_[axis].logscale) { + return yRange[0] + (area.y + area.h - y) / area.h * (yRange[1] - yRange[0]); + } else { + // Computing the inverse of toDomCoord. + var pct = (y - area.y) / area.h; + + // Computing the inverse of toPercentYCoord. The function was arrived at with + // the following steps: + // + // Original calcuation: + // pct = (logr1 - Dygraph.log10(y)) / (logr1 - Dygraph.log10(yRange[0])); + // + // Move denominator to both sides: + // pct * (logr1 - Dygraph.log10(yRange[0])) = logr1 - Dygraph.log10(y); + // + // subtract logr1, and take the negative value. + // logr1 - (pct * (logr1 - Dygraph.log10(yRange[0]))) = Dygraph.log10(y); + // + // Swap both sides of the equation, and we can compute the log of the + // return value. Which means we just need to use that as the exponent in + // e^exponent. + // Dygraph.log10(y) = logr1 - (pct * (logr1 - Dygraph.log10(yRange[0]))); + + var logr1 = Dygraph.log10(yRange[1]); + var exponent = logr1 - (pct * (logr1 - Dygraph.log10(yRange[0]))); + var value = Math.pow(Dygraph.LOG_SCALE, exponent); + return value; + } +}; + +/** + * Converts a y for an axis to a percentage from the top to the + * bottom of the drawing area. + * + * If the coordinate represents a value visible on the canvas, then + * the value will be between 0 and 1, where 0 is the top of the canvas. + * However, this method will return values outside the range, as + * values can fall outside the canvas. + * + * If y is null, this returns null. + * if axis is null, this uses the first axis. + * + * @param { Number } y The data y-coordinate. + * @param { Number } [axis] The axis number on which the data coordinate lives. + * @return { Number } A fraction in [0, 1] where 0 = the top edge. + */ +Dygraph.prototype.toPercentYCoord = function(y, axis) { + if (y === null) { + return null; + } + if (typeof(axis) == "undefined") axis = 0; + + var yRange = this.yAxisRange(axis); + + var pct; + if (!this.axes_[axis].logscale) { + // yRange[1] - y is unit distance from the bottom. + // yRange[1] - yRange[0] is the scale of the range. + // (yRange[1] - y) / (yRange[1] - yRange[0]) is the % from the bottom. + pct = (yRange[1] - y) / (yRange[1] - yRange[0]); + } else { + var logr1 = Dygraph.log10(yRange[1]); + pct = (logr1 - Dygraph.log10(y)) / (logr1 - Dygraph.log10(yRange[0])); + } + return pct; +}; + +/** + * Converts an x value to a percentage from the left to the right of + * the drawing area. + * + * If the coordinate represents a value visible on the canvas, then + * the value will be between 0 and 1, where 0 is the left of the canvas. + * However, this method will return values outside the range, as + * values can fall outside the canvas. + * + * If x is null, this returns null. + * @param { Number } x The data x-coordinate. + * @return { Number } A fraction in [0, 1] where 0 = the left edge. + */ +Dygraph.prototype.toPercentXCoord = function(x) { + if (x === null) { + return null; + } + + var xRange = this.xAxisRange(); + return (x - xRange[0]) / (xRange[1] - xRange[0]); +}; + +/** + * Returns the number of columns (including the independent variable). + * @return { Integer } The number of columns. + */ +Dygraph.prototype.numColumns = function() { + return this.rawData_[0] ? this.rawData_[0].length : this.attr_("labels").length; +}; + +/** + * Returns the number of rows (excluding any header/label row). + * @return { Integer } The number of rows, less any header. + */ +Dygraph.prototype.numRows = function() { + return this.rawData_.length; +}; + +/** + * Returns the full range of the x-axis, as determined by the most extreme + * values in the data set. Not affected by zooming, visibility, etc. + * TODO(danvk): merge w/ xAxisExtremes + * @return { Array } A [low, high] pair + * @private + */ +Dygraph.prototype.fullXRange_ = function() { + if (this.numRows() > 0) { + return [this.rawData_[0][0], this.rawData_[this.numRows() - 1][0]]; + } else { + return [0, 1]; + } +}; + +/** + * Returns the value in the given row and column. If the row and column exceed + * the bounds on the data, returns null. Also returns null if the value is + * missing. + * @param { Number} row The row number of the data (0-based). Row 0 is the + * first row of data, not a header row. + * @param { Number} col The column number of the data (0-based) + * @return { Number } The value in the specified cell or null if the row/col + * were out of range. + */ +Dygraph.prototype.getValue = function(row, col) { + if (row < 0 || row > this.rawData_.length) return null; + if (col < 0 || col > this.rawData_[row].length) return null; + + return this.rawData_[row][col]; +}; + +/** + * Generates interface elements for the Dygraph: a containing div, a div to + * display the current point, and a textbox to adjust the rolling average + * period. Also creates the Renderer/Layout elements. + * @private + */ +Dygraph.prototype.createInterface_ = function() { + // Create the all-enclosing graph div + var enclosing = this.maindiv_; + + this.graphDiv = document.createElement("div"); + this.graphDiv.style.width = this.width_ + "px"; + this.graphDiv.style.height = this.height_ + "px"; + enclosing.appendChild(this.graphDiv); + + // Create the canvas for interactive parts of the chart. + this.canvas_ = Dygraph.createCanvas(); + this.canvas_.style.position = "absolute"; + this.canvas_.width = this.width_; + this.canvas_.height = this.height_; + this.canvas_.style.width = this.width_ + "px"; // for IE + this.canvas_.style.height = this.height_ + "px"; // for IE + + this.canvas_ctx_ = Dygraph.getContext(this.canvas_); + + // ... and for static parts of the chart. + this.hidden_ = this.createPlotKitCanvas_(this.canvas_); + this.hidden_ctx_ = Dygraph.getContext(this.hidden_); + + if (this.attr_('showRangeSelector')) { + // The range selector must be created here so that its canvases and contexts get created here. + // For some reason, if the canvases and contexts don't get created here, things don't work in IE. + // The range selector also sets xAxisHeight in order to reserve space. + this.rangeSelector_ = new DygraphRangeSelector(this); + } + + // The interactive parts of the graph are drawn on top of the chart. + this.graphDiv.appendChild(this.hidden_); + this.graphDiv.appendChild(this.canvas_); + this.mouseEventElement_ = this.createMouseEventElement_(); + + // Create the grapher + this.layout_ = new DygraphLayout(this); + + if (this.rangeSelector_) { + // This needs to happen after the graph canvases are added to the div and the layout object is created. + this.rangeSelector_.addToGraph(this.graphDiv, this.layout_); + } + + var dygraph = this; + Dygraph.addEvent(this.mouseEventElement_, 'mousemove', function(e) { + dygraph.mouseMove_(e); + }); + Dygraph.addEvent(this.mouseEventElement_, 'mouseout', function(e) { + dygraph.mouseOut_(e); + }); + + this.createStatusMessage_(); + this.createDragInterface_(); + + this.resizeHandler = function(e) { + dygraph.resize(); + } + + // Update when the window is resized. + // TODO(danvk): drop frames depending on complexity of the chart. + Dygraph.addEvent(window, 'resize', this.resizeHandler); +}; + +/** + * Detach DOM elements in the dygraph and null out all data references. + * Calling this when you're done with a dygraph can dramatically reduce memory + * usage. See, e.g., the tests/perf.html example. + */ +Dygraph.prototype.destroy = function() { + var removeRecursive = function(node) { + while (node.hasChildNodes()) { + removeRecursive(node.firstChild); + node.removeChild(node.firstChild); + } + }; + removeRecursive(this.maindiv_); + + var nullOut = function(obj) { + for (var n in obj) { + if (typeof(obj[n]) === 'object') { + obj[n] = null; + } + } + }; + // remove event handlers + Dygraph.removeEvent(window,'resize',this.resizeHandler); + this.resizeHandler = null; + // These may not all be necessary, but it can't hurt... + nullOut(this.layout_); + nullOut(this.plotter_); + nullOut(this); +}; + +/** + * Creates the canvas on which the chart will be drawn. Only the Renderer ever + * draws on this particular canvas. All Dygraph work (i.e. drawing hover dots + * or the zoom rectangles) is done on this.canvas_. + * @param {Object} canvas The Dygraph canvas over which to overlay the plot + * @return {Object} The newly-created canvas + * @private + */ +Dygraph.prototype.createPlotKitCanvas_ = function(canvas) { + var h = Dygraph.createCanvas(); + h.style.position = "absolute"; + // TODO(danvk): h should be offset from canvas. canvas needs to include + // some extra area to make it easier to zoom in on the far left and far + // right. h needs to be precisely the plot area, so that clipping occurs. + h.style.top = canvas.style.top; + h.style.left = canvas.style.left; + h.width = this.width_; + h.height = this.height_; + h.style.width = this.width_ + "px"; // for IE + h.style.height = this.height_ + "px"; // for IE + return h; +}; + +/** + * Creates an overlay element used to handle mouse events. + * @return {Object} The mouse event element. + * @private + */ +Dygraph.prototype.createMouseEventElement_ = function() { + if (this.isUsingExcanvas_) { + var elem = document.createElement("div"); + elem.style.position = 'absolute'; + elem.style.backgroundColor = 'white'; + elem.style.filter = 'alpha(opacity=0)'; + elem.style.width = this.width_ + "px"; + elem.style.height = this.height_ + "px"; + this.graphDiv.appendChild(elem); + return elem; + } else { + return this.canvas_; + } +}; + +/** + * Generate a set of distinct colors for the data series. This is done with a + * color wheel. Saturation/Value are customizable, and the hue is + * equally-spaced around the color wheel. If a custom set of colors is + * specified, that is used instead. + * @private + */ +Dygraph.prototype.setColors_ = function() { + var num = this.attr_("labels").length - 1; + this.colors_ = []; + var colors = this.attr_('colors'); + var i; + if (!colors) { + var sat = this.attr_('colorSaturation') || 1.0; + var val = this.attr_('colorValue') || 0.5; + var half = Math.ceil(num / 2); + for (i = 1; i <= num; i++) { + if (!this.visibility()[i-1]) continue; + // alternate colors for high contrast. + var idx = i % 2 ? Math.ceil(i / 2) : (half + i / 2); + var hue = (1.0 * idx/ (1 + num)); + this.colors_.push(Dygraph.hsvToRGB(hue, sat, val)); + } + } else { + for (i = 0; i < num; i++) { + if (!this.visibility()[i]) continue; + var colorStr = colors[i % colors.length]; + this.colors_.push(colorStr); + } + } + + this.plotter_.setColors(this.colors_); +}; + +/** + * Return the list of colors. This is either the list of colors passed in the + * attributes or the autogenerated list of rgb(r,g,b) strings. + * @return {Array} The list of colors. + */ +Dygraph.prototype.getColors = function() { + return this.colors_; +}; + +/** + * Create the div that contains information on the selected point(s) + * This goes in the top right of the canvas, unless an external div has already + * been specified. + * @private + */ +Dygraph.prototype.createStatusMessage_ = function() { + var userLabelsDiv = this.user_attrs_.labelsDiv; + if (userLabelsDiv && null !== userLabelsDiv && + (typeof(userLabelsDiv) == "string" || userLabelsDiv instanceof String)) { + this.user_attrs_.labelsDiv = document.getElementById(userLabelsDiv); + } + if (!this.attr_("labelsDiv")) { + var divWidth = this.attr_('labelsDivWidth'); + var messagestyle = { + "position": "absolute", + "fontSize": "14px", + "zIndex": 10, + "width": divWidth + "px", + "top": "0px", + "left": (this.width_ - divWidth - 2) + "px", + "background": "white", + "textAlign": "left", + "overflow": "hidden"}; + Dygraph.update(messagestyle, this.attr_('labelsDivStyles')); + var div = document.createElement("div"); + div.className = "dygraph-legend"; + for (var name in messagestyle) { + if (messagestyle.hasOwnProperty(name)) { + div.style[name] = messagestyle[name]; + } + } + this.graphDiv.appendChild(div); + this.attrs_.labelsDiv = div; + } +}; + +/** + * Position the labels div so that: + * - its right edge is flush with the right edge of the charting area + * - its top edge is flush with the top edge of the charting area + * @private + */ +Dygraph.prototype.positionLabelsDiv_ = function() { + // Don't touch a user-specified labelsDiv. + if (this.user_attrs_.hasOwnProperty("labelsDiv")) return; + + var area = this.plotter_.area; + var div = this.attr_("labelsDiv"); + div.style.left = area.x + area.w - this.attr_("labelsDivWidth") - 1 + "px"; + div.style.top = area.y + "px"; +}; + +/** + * Create the text box to adjust the averaging period + * @private + */ +Dygraph.prototype.createRollInterface_ = function() { + // Create a roller if one doesn't exist already. + if (!this.roller_) { + this.roller_ = document.createElement("input"); + this.roller_.type = "text"; + this.roller_.style.display = "none"; + this.graphDiv.appendChild(this.roller_); + } + + var display = this.attr_('showRoller') ? 'block' : 'none'; + + var area = this.plotter_.area; + var textAttr = { "position": "absolute", + "zIndex": 10, + "top": (area.y + area.h - 25) + "px", + "left": (area.x + 1) + "px", + "display": display + }; + this.roller_.size = "2"; + this.roller_.value = this.rollPeriod_; + for (var name in textAttr) { + if (textAttr.hasOwnProperty(name)) { + this.roller_.style[name] = textAttr[name]; + } + } + + var dygraph = this; + this.roller_.onchange = function() { dygraph.adjustRoll(dygraph.roller_.value); }; +}; + +/** + * @private + * Converts page the x-coordinate of the event to pixel x-coordinates on the + * canvas (i.e. DOM Coords). + */ +Dygraph.prototype.dragGetX_ = function(e, context) { + return Dygraph.pageX(e) - context.px; +}; + +/** + * @private + * Converts page the y-coordinate of the event to pixel y-coordinates on the + * canvas (i.e. DOM Coords). + */ +Dygraph.prototype.dragGetY_ = function(e, context) { + return Dygraph.pageY(e) - context.py; +}; + +/** + * Set up all the mouse handlers needed to capture dragging behavior for zoom + * events. + * @private + */ +Dygraph.prototype.createDragInterface_ = function() { + var context = { + // Tracks whether the mouse is down right now + isZooming: false, + isPanning: false, // is this drag part of a pan? + is2DPan: false, // if so, is that pan 1- or 2-dimensional? + dragStartX: null, // pixel coordinates + dragStartY: null, // pixel coordinates + dragEndX: null, // pixel coordinates + dragEndY: null, // pixel coordinates + dragDirection: null, + prevEndX: null, // pixel coordinates + prevEndY: null, // pixel coordinates + prevDragDirection: null, + + // The value on the left side of the graph when a pan operation starts. + initialLeftmostDate: null, + + // The number of units each pixel spans. (This won't be valid for log + // scales) + xUnitsPerPixel: null, + + // TODO(danvk): update this comment + // The range in second/value units that the viewport encompasses during a + // panning operation. + dateRange: null, + + // Top-left corner of the canvas, in DOM coords + // TODO(konigsberg): Rename topLeftCanvasX, topLeftCanvasY. + px: 0, + py: 0, + + // Values for use with panEdgeFraction, which limit how far outside the + // graph's data boundaries it can be panned. + boundedDates: null, // [minDate, maxDate] + boundedValues: null, // [[minValue, maxValue] ...] + + initializeMouseDown: function(event, g, context) { + // prevents mouse drags from selecting page text. + if (event.preventDefault) { + event.preventDefault(); // Firefox, Chrome, etc. + } else { + event.returnValue = false; // IE + event.cancelBubble = true; + } + + context.px = Dygraph.findPosX(g.canvas_); + context.py = Dygraph.findPosY(g.canvas_); + context.dragStartX = g.dragGetX_(event, context); + context.dragStartY = g.dragGetY_(event, context); + } + }; + + var interactionModel = this.attr_("interactionModel"); + + // Self is the graph. + var self = this; + + // Function that binds the graph and context to the handler. + var bindHandler = function(handler) { + return function(event) { + handler(event, self, context); + }; + }; + + for (var eventName in interactionModel) { + if (!interactionModel.hasOwnProperty(eventName)) continue; + Dygraph.addEvent(this.mouseEventElement_, eventName, + bindHandler(interactionModel[eventName])); + } + + // If the user releases the mouse button during a drag, but not over the + // canvas, then it doesn't count as a zooming action. + Dygraph.addEvent(document, 'mouseup', function(event) { + if (context.isZooming || context.isPanning) { + context.isZooming = false; + context.dragStartX = null; + context.dragStartY = null; + } + + if (context.isPanning) { + context.isPanning = false; + context.draggingDate = null; + context.dateRange = null; + for (var i = 0; i < self.axes_.length; i++) { + delete self.axes_[i].draggingValue; + delete self.axes_[i].dragValueRange; + } + } + }); +}; + +/** + * Draw a gray zoom rectangle over the desired area of the canvas. Also clears + * up any previous zoom rectangles that were drawn. This could be optimized to + * avoid extra redrawing, but it's tricky to avoid interactions with the status + * dots. + * + * @param {Number} direction the direction of the zoom rectangle. Acceptable + * values are Dygraph.HORIZONTAL and Dygraph.VERTICAL. + * @param {Number} startX The X position where the drag started, in canvas + * coordinates. + * @param {Number} endX The current X position of the drag, in canvas coords. + * @param {Number} startY The Y position where the drag started, in canvas + * coordinates. + * @param {Number} endY The current Y position of the drag, in canvas coords. + * @param {Number} prevDirection the value of direction on the previous call to + * this function. Used to avoid excess redrawing + * @param {Number} prevEndX The value of endX on the previous call to this + * function. Used to avoid excess redrawing + * @param {Number} prevEndY The value of endY on the previous call to this + * function. Used to avoid excess redrawing + * @private + */ +Dygraph.prototype.drawZoomRect_ = function(direction, startX, endX, startY, + endY, prevDirection, prevEndX, + prevEndY) { + var ctx = this.canvas_ctx_; + + // Clean up from the previous rect if necessary + if (prevDirection == Dygraph.HORIZONTAL) { + ctx.clearRect(Math.min(startX, prevEndX), this.layout_.getPlotArea().y, + Math.abs(startX - prevEndX), this.layout_.getPlotArea().h); + } else if (prevDirection == Dygraph.VERTICAL){ + ctx.clearRect(this.layout_.getPlotArea().x, Math.min(startY, prevEndY), + this.layout_.getPlotArea().w, Math.abs(startY - prevEndY)); + } + + // Draw a light-grey rectangle to show the new viewing area + if (direction == Dygraph.HORIZONTAL) { + if (endX && startX) { + ctx.fillStyle = "rgba(128,128,128,0.33)"; + ctx.fillRect(Math.min(startX, endX), this.layout_.getPlotArea().y, + Math.abs(endX - startX), this.layout_.getPlotArea().h); + } + } else if (direction == Dygraph.VERTICAL) { + if (endY && startY) { + ctx.fillStyle = "rgba(128,128,128,0.33)"; + ctx.fillRect(this.layout_.getPlotArea().x, Math.min(startY, endY), + this.layout_.getPlotArea().w, Math.abs(endY - startY)); + } + } + + if (this.isUsingExcanvas_) { + this.currentZoomRectArgs_ = [direction, startX, endX, startY, endY, 0, 0, 0]; + } +}; + +/** + * Clear the zoom rectangle (and perform no zoom). + * @private + */ +Dygraph.prototype.clearZoomRect_ = function() { + this.currentZoomRectArgs_ = null; + this.canvas_ctx_.clearRect(0, 0, this.canvas_.width, this.canvas_.height); +}; + +/** + * Zoom to something containing [lowX, highX]. These are pixel coordinates in + * the canvas. The exact zoom window may be slightly larger if there are no data + * points near lowX or highX. Don't confuse this function with doZoomXDates, + * which accepts dates that match the raw data. This function redraws the graph. + * + * @param {Number} lowX The leftmost pixel value that should be visible. + * @param {Number} highX The rightmost pixel value that should be visible. + * @private + */ +Dygraph.prototype.doZoomX_ = function(lowX, highX) { + this.currentZoomRectArgs_ = null; + // Find the earliest and latest dates contained in this canvasx range. + // Convert the call to date ranges of the raw data. + var minDate = this.toDataXCoord(lowX); + var maxDate = this.toDataXCoord(highX); + this.doZoomXDates_(minDate, maxDate); +}; + +/** + * Transition function to use in animations. Returns values between 0.0 + * (totally old values) and 1.0 (totally new values) for each frame. + * @private + */ +Dygraph.zoomAnimationFunction = function(frame, numFrames) { + var k = 1.5; + return (1.0 - Math.pow(k, -frame)) / (1.0 - Math.pow(k, -numFrames)); +}; + +/** + * Zoom to something containing [minDate, maxDate] values. Don't confuse this + * method with doZoomX which accepts pixel coordinates. This function redraws + * the graph. + * + * @param {Number} minDate The minimum date that should be visible. + * @param {Number} maxDate The maximum date that should be visible. + * @private + */ +Dygraph.prototype.doZoomXDates_ = function(minDate, maxDate) { + // TODO(danvk): when yAxisRange is null (i.e. "fit to data", the animation + // can produce strange effects. Rather than the y-axis transitioning slowly + // between values, it can jerk around.) + var old_window = this.xAxisRange(); + var new_window = [minDate, maxDate]; + this.zoomed_x_ = true; + var that = this; + this.doAnimatedZoom(old_window, new_window, null, null, function() { + if (that.attr_("zoomCallback")) { + that.attr_("zoomCallback")(minDate, maxDate, that.yAxisRanges()); + } + }); +}; + +/** + * Zoom to something containing [lowY, highY]. These are pixel coordinates in + * the canvas. This function redraws the graph. + * + * @param {Number} lowY The topmost pixel value that should be visible. + * @param {Number} highY The lowest pixel value that should be visible. + * @private + */ +Dygraph.prototype.doZoomY_ = function(lowY, highY) { + this.currentZoomRectArgs_ = null; + // Find the highest and lowest values in pixel range for each axis. + // Note that lowY (in pixels) corresponds to the max Value (in data coords). + // This is because pixels increase as you go down on the screen, whereas data + // coordinates increase as you go up the screen. + var oldValueRanges = this.yAxisRanges(); + var newValueRanges = []; + for (var i = 0; i < this.axes_.length; i++) { + var hi = this.toDataYCoord(lowY, i); + var low = this.toDataYCoord(highY, i); + newValueRanges.push([low, hi]); + } + + this.zoomed_y_ = true; + var that = this; + this.doAnimatedZoom(null, null, oldValueRanges, newValueRanges, function() { + if (that.attr_("zoomCallback")) { + var xRange = that.xAxisRange(); + that.attr_("zoomCallback")(xRange[0], xRange[1], that.yAxisRanges()); + } + }); +}; + +/** + * Reset the zoom to the original view coordinates. This is the same as + * double-clicking on the graph. + * + * @private + */ +Dygraph.prototype.doUnzoom_ = function() { + var dirty = false, dirtyX = false, dirtyY = false; + if (this.dateWindow_ !== null) { + dirty = true; + dirtyX = true; + } + + for (var i = 0; i < this.axes_.length; i++) { + if (this.axes_[i].valueWindow !== null) { + dirty = true; + dirtyY = true; + } + } + + // Clear any selection, since it's likely to be drawn in the wrong place. + this.clearSelection(); + + if (dirty) { + this.zoomed_x_ = false; + this.zoomed_y_ = false; + + var minDate = this.rawData_[0][0]; + var maxDate = this.rawData_[this.rawData_.length - 1][0]; + + // With only one frame, don't bother calculating extreme ranges. + // TODO(danvk): merge this block w/ the code below. + if (!this.attr_("animatedZooms")) { + this.dateWindow_ = null; + for (i = 0; i < this.axes_.length; i++) { + if (this.axes_[i].valueWindow !== null) { + delete this.axes_[i].valueWindow; + } + } + this.drawGraph_(); + if (this.attr_("zoomCallback")) { + this.attr_("zoomCallback")(minDate, maxDate, this.yAxisRanges()); + } + return; + } + + var oldWindow=null, newWindow=null, oldValueRanges=null, newValueRanges=null; + if (dirtyX) { + oldWindow = this.xAxisRange(); + newWindow = [minDate, maxDate]; + } + + if (dirtyY) { + oldValueRanges = this.yAxisRanges(); + // TODO(danvk): this is pretty inefficient + var packed = this.gatherDatasets_(this.rolledSeries_, null); + var extremes = packed[1]; + + // this has the side-effect of modifying this.axes_. + // this doesn't make much sense in this context, but it's convenient (we + // need this.axes_[*].extremeValues) and not harmful since we'll be + // calling drawGraph_ shortly, which clobbers these values. + this.computeYAxisRanges_(extremes); + + newValueRanges = []; + for (i = 0; i < this.axes_.length; i++) { + newValueRanges.push(this.axes_[i].extremeRange); + } + } + + var that = this; + this.doAnimatedZoom(oldWindow, newWindow, oldValueRanges, newValueRanges, + function() { + that.dateWindow_ = null; + for (var i = 0; i < that.axes_.length; i++) { + if (that.axes_[i].valueWindow !== null) { + delete that.axes_[i].valueWindow; + } + } + if (that.attr_("zoomCallback")) { + that.attr_("zoomCallback")(minDate, maxDate, that.yAxisRanges()); + } + }); + } +}; + +/** + * Combined animation logic for all zoom functions. + * either the x parameters or y parameters may be null. + * @private + */ +Dygraph.prototype.doAnimatedZoom = function(oldXRange, newXRange, oldYRanges, newYRanges, callback) { + var steps = this.attr_("animatedZooms") ? Dygraph.ANIMATION_STEPS : 1; + + var windows = []; + var valueRanges = []; + var step, frac; + + if (oldXRange !== null && newXRange !== null) { + for (step = 1; step <= steps; step++) { + frac = Dygraph.zoomAnimationFunction(step, steps); + windows[step-1] = [oldXRange[0]*(1-frac) + frac*newXRange[0], + oldXRange[1]*(1-frac) + frac*newXRange[1]]; + } + } + + if (oldYRanges !== null && newYRanges !== null) { + for (step = 1; step <= steps; step++) { + frac = Dygraph.zoomAnimationFunction(step, steps); + var thisRange = []; + for (var j = 0; j < this.axes_.length; j++) { + thisRange.push([oldYRanges[j][0]*(1-frac) + frac*newYRanges[j][0], + oldYRanges[j][1]*(1-frac) + frac*newYRanges[j][1]]); + } + valueRanges[step-1] = thisRange; + } + } + + var that = this; + Dygraph.repeatAndCleanup(function(step) { + if (valueRanges.length) { + for (var i = 0; i < that.axes_.length; i++) { + var w = valueRanges[step][i]; + that.axes_[i].valueWindow = [w[0], w[1]]; + } + } + if (windows.length) { + that.dateWindow_ = windows[step]; + } + that.drawGraph_(); + }, steps, Dygraph.ANIMATION_DURATION / steps, callback); +}; + +/** + * When the mouse moves in the canvas, display information about a nearby data + * point and draw dots over those points in the data series. This function + * takes care of cleanup of previously-drawn dots. + * @param {Object} event The mousemove event from the browser. + * @private + */ +Dygraph.prototype.mouseMove_ = function(event) { + // This prevents JS errors when mousing over the canvas before data loads. + var points = this.layout_.points; + if (points === undefined) return; + + var canvasx = Dygraph.pageX(event) - Dygraph.findPosX(this.mouseEventElement_); + + var lastx = -1; + var i; + + // Loop through all the points and find the date nearest to our current + // location. + var minDist = 1e+100; + var idx = -1; + for (i = 0; i < points.length; i++) { + var point = points[i]; + if (point === null) continue; + var dist = Math.abs(point.canvasx - canvasx); + if (dist > minDist) continue; + minDist = dist; + idx = i; + } + if (idx >= 0) lastx = points[idx].xval; + + // Extract the points we've selected + this.selPoints_ = []; + var l = points.length; + if (!this.attr_("stackedGraph")) { + for (i = 0; i < l; i++) { + if (points[i].xval == lastx) { + this.selPoints_.push(points[i]); + } + } + } else { + // Need to 'unstack' points starting from the bottom + var cumulative_sum = 0; + for (i = l - 1; i >= 0; i--) { + if (points[i].xval == lastx) { + var p = {}; // Clone the point since we modify it + for (var k in points[i]) { + p[k] = points[i][k]; + } + p.yval -= cumulative_sum; + cumulative_sum += p.yval; + this.selPoints_.push(p); + } + } + this.selPoints_.reverse(); + } + + if (this.attr_("highlightCallback")) { + var px = this.lastx_; + if (px !== null && lastx != px) { + // only fire if the selected point has changed. + this.attr_("highlightCallback")(event, lastx, this.selPoints_, this.idxToRow_(idx)); + } + } + + // Save last x position for callbacks. + this.lastx_ = lastx; + + this.updateSelection_(); +}; + +/** + * Transforms layout_.points index into data row number. + * @param int layout_.points index + * @return int row number, or -1 if none could be found. + * @private + */ +Dygraph.prototype.idxToRow_ = function(idx) { + if (idx < 0) return -1; + + // make sure that you get the boundaryIds record which is also defined (see bug #236) + var boundaryIdx = -1; + for (var i = 0; i < this.boundaryIds_.length; i++) { + if (this.boundaryIds_[i] !== undefined) { + boundaryIdx = i; + break; + } + } + if (boundaryIdx < 0) return -1; + for (var name in this.layout_.datasets) { + if (idx < this.layout_.datasets[name].length) { + return this.boundaryIds_[boundaryIdx][0] + idx; + } + idx -= this.layout_.datasets[name].length; + } + return -1; +}; + +/** + * @private + * Generates legend html dash for any stroke pattern. It will try to scale the + * pattern to fit in 1em width. Or if small enough repeat the partern for 1em + * width. + * @param strokePattern The pattern + * @param color The color of the series. + * @param oneEmWidth The width in pixels of 1em in the legend. + */ +Dygraph.prototype.generateLegendDashHTML_ = function(strokePattern, color, oneEmWidth) { + var dash = ""; + var i, j, paddingLeft, marginRight; + var strokePixelLength = 0, segmentLoop = 0; + var normalizedPattern = []; + var loop; + // IE 7,8 fail at these divs, so they get boring legend, have not tested 9. + var isIE = (/MSIE/.test(navigator.userAgent) && !window.opera); + if(isIE) { + return "—"; + } + if (!strokePattern || strokePattern.length <= 1) { + // Solid line + dash = "
"; + } else { + // Compute the length of the pixels including the first segment twice, + // since we repeat it. + for (i = 0; i <= strokePattern.length; i++) { + strokePixelLength += strokePattern[i%strokePattern.length]; + } + + // See if we can loop the pattern by itself at least twice. + loop = Math.floor(oneEmWidth/(strokePixelLength-strokePattern[0])); + if (loop > 1) { + // This pattern fits at least two times, no scaling just convert to em; + for (i = 0; i < strokePattern.length; i++) { + normalizedPattern[i] = strokePattern[i]/oneEmWidth; + } + // Since we are repeating the pattern, we don't worry about repeating the + // first segment in one draw. + segmentLoop = normalizedPattern.length; + } else { + // If the pattern doesn't fit in the legend we scale it to fit. + loop = 1; + for (i = 0; i < strokePattern.length; i++) { + normalizedPattern[i] = strokePattern[i]/strokePixelLength; + } + // For the scaled patterns we do redraw the first segment. + segmentLoop = normalizedPattern.length+1; + } + // Now make the pattern. + for (j = 0; j < loop; j++) { + for (i = 0; i < segmentLoop; i+=2) { + // The padding is the drawn segment. + paddingLeft = normalizedPattern[i%normalizedPattern.length]; + if (i < strokePattern.length) { + // The margin is the space segment. + marginRight = normalizedPattern[(i+1)%normalizedPattern.length]; + } else { + // The repeated first segment has no right margin. + marginRight = 0; + } + dash += "
"; + } + } + } + return dash; +}; + +/** + * @private + * Generates HTML for the legend which is displayed when hovering over the + * chart. If no selected points are specified, a default legend is returned + * (this may just be the empty string). + * @param { Number } [x] The x-value of the selected points. + * @param { [Object] } [sel_points] List of selected points for the given + * x-value. Should have properties like 'name', 'yval' and 'canvasy'. + * @param { Number } [oneEmWidth] The pixel width for 1em in the legend. + */ +Dygraph.prototype.generateLegendHTML_ = function(x, sel_points, oneEmWidth) { + // If no points are selected, we display a default legend. Traditionally, + // this has been blank. But a better default would be a conventional legend, + // which provides essential information for a non-interactive chart. + var html, sepLines, i, c, dash, strokePattern; + if (typeof(x) === 'undefined') { + if (this.attr_('legend') != 'always') return ''; + + sepLines = this.attr_('labelsSeparateLines'); + var labels = this.attr_('labels'); + html = ''; + for (i = 1; i < labels.length; i++) { + if (!this.visibility()[i - 1]) continue; + c = this.plotter_.colors[labels[i]]; + if (html !== '') html += (sepLines ? '
' : ' '); + strokePattern = this.attr_("strokePattern", labels[i]); + dash = this.generateLegendDashHTML_(strokePattern, c, oneEmWidth); + html += "" + dash + + " " + labels[i] + ""; + } + return html; + } + + var xOptView = this.optionsViewForAxis_('x'); + var xvf = xOptView('valueFormatter'); + html = xvf(x, xOptView, this.attr_('labels')[0], this) + ":"; + + var yOptViews = []; + var num_axes = this.numAxes(); + for (i = 0; i < num_axes; i++) { + yOptViews[i] = this.optionsViewForAxis_('y' + (i ? 1 + i : '')); + } + var showZeros = this.attr_("labelsShowZeroValues"); + sepLines = this.attr_("labelsSeparateLines"); + for (i = 0; i < this.selPoints_.length; i++) { + var pt = this.selPoints_[i]; + if (pt.yval === 0 && !showZeros) continue; + if (!Dygraph.isOK(pt.canvasy)) continue; + if (sepLines) html += "
"; + + var yOptView = yOptViews[this.seriesToAxisMap_[pt.name]]; + var fmtFunc = yOptView('valueFormatter'); + c = this.plotter_.colors[pt.name]; + var yval = fmtFunc(pt.yval, yOptView, pt.name, this); + + // TODO(danvk): use a template string here and make it an attribute. + html += " " + pt.name + + ":" + yval; + } + return html; +}; + +/** + * @private + * Displays information about the selected points in the legend. If there is no + * selection, the legend will be cleared. + * @param { Number } [x] The x-value of the selected points. + * @param { [Object] } [sel_points] List of selected points for the given + * x-value. Should have properties like 'name', 'yval' and 'canvasy'. + */ +Dygraph.prototype.setLegendHTML_ = function(x, sel_points) { + var labelsDiv = this.attr_("labelsDiv"); + var sizeSpan = document.createElement('span'); + // Calculates the width of 1em in pixels for the legend. + sizeSpan.setAttribute('style', 'margin: 0; padding: 0 0 0 1em; border: 0;'); + labelsDiv.appendChild(sizeSpan); + var oneEmWidth=sizeSpan.offsetWidth; + + var html = this.generateLegendHTML_(x, sel_points, oneEmWidth); + if (labelsDiv !== null) { + labelsDiv.innerHTML = html; + } else { + if (typeof(this.shown_legend_error_) == 'undefined') { + this.error('labelsDiv is set to something nonexistent; legend will not be shown.'); + this.shown_legend_error_ = true; + } + } +}; + +/** + * Draw dots over the selectied points in the data series. This function + * takes care of cleanup of previously-drawn dots. + * @private + */ +Dygraph.prototype.updateSelection_ = function() { + // Clear the previously drawn vertical, if there is one + var i; + var ctx = this.canvas_ctx_; + if (this.previousVerticalX_ >= 0) { + // Determine the maximum highlight circle size. + var maxCircleSize = 0; + var labels = this.attr_('labels'); + for (i = 1; i < labels.length; i++) { + var r = this.attr_('highlightCircleSize', labels[i]); + if (r > maxCircleSize) maxCircleSize = r; + } + var px = this.previousVerticalX_; + ctx.clearRect(px - maxCircleSize - 1, 0, + 2 * maxCircleSize + 2, this.height_); + } + + if (this.isUsingExcanvas_ && this.currentZoomRectArgs_) { + Dygraph.prototype.drawZoomRect_.apply(this, this.currentZoomRectArgs_); + } + + if (this.selPoints_.length > 0) { + // Set the status message to indicate the selected point(s) + if (this.attr_('showLabelsOnHighlight')) { + this.setLegendHTML_(this.lastx_, this.selPoints_); +