--- /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.l
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