--- /dev/null
+/**
+ * @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<ticks.length; i++) {
+ x = halfUp(this.area.x + ticks[i][0] * this.area.w);
+ y = halfDown(this.area.y + this.area.h);
+ ctx.beginPath();
+ ctx.moveTo(x, y);
+ ctx.lineTo(x, this.area.y);
+ ctx.closePath();
+ ctx.stroke();
+ }
+ }
+
+ // Do the ordinary rendering, as before
+ this._renderLineChart();
+ this._renderAxis();
+ this._renderChartLabels();
+ this._renderAnnotations();
+};
+
+DygraphCanvasRenderer.prototype._createIEClipArea = function() {
+ var className = 'dygraph-clip-div';
+ var graphDiv = this.dygraph_.graphDiv;
+
+ // Remove old clip divs.
+ for (var i = graphDiv.childNodes.length-1; 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:
+ <div id="graphdiv" style="width:800px; height:500px;"></div>
+ <script type="text/javascript">
+ new Dygraph(document.getElementById("graphdiv"),
+ "datafile.csv", // CSV file with headers
+ { }); // options
+ </script>
+
+ 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 <div></div> 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<Number> } 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<string>} 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;
+ //
projects / kraken-ui.git / commitdiff