-// Copyright 2006 Dan Vanderkam (danvdk@gmail.com)
-// All Rights Reserved.
+/**
+ * @license
+ * Copyright 2006 Dan Vanderkam (danvdk@gmail.com)
+ * MIT-licensed (http://opensource.org/licenses/MIT)
+ */
/**
- * @fileoverview Based on PlotKit, but modified to meet the needs of dygraphs.
+ * @fileoverview Based on PlotKit.CanvasRenderer, but modified to meet the
+ * needs of dygraphs.
+ *
* In particular, support for:
- * - grid overlays
+ * - grid overlays
* - error bars
* - dygraphs attribute system
*/
/**
- * Creates a new DygraphLayout object.
- * @param {Object} options Options for PlotKit.Layout
- * @return {Object} The DygraphLayout object
- */
-DygraphLayout = function(dygraph, options) {
- this.dygraph_ = dygraph;
- this.options = {}; // TODO(danvk): remove, use attr_ instead.
- MochiKit.Base.update(this.options, options ? options : {});
- this.datasets = new Array();
-};
-
-DygraphLayout.prototype.attr_ = function(name) {
- return this.dygraph_.attr_(name);
-};
-
-DygraphLayout.prototype.addDataset = function(setname, set_xy) {
- this.datasets[setname] = set_xy;
-};
-
-DygraphLayout.prototype.evaluate = function() {
- this._evaluateLimits();
- this._evaluateLineCharts();
- this._evaluateLineTicks();
-};
-
-DygraphLayout.prototype._evaluateLimits = function() {
- this.minxval = this.maxxval = null;
- for (var name in this.datasets) {
- var series = this.datasets[name];
- 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);
-
- this.minyval = this.options.yAxis[0];
- this.maxyval = this.options.yAxis[1];
- this.yrange = this.maxyval - this.minyval;
- this.yscale = (this.yrange != 0 ? 1/this.yrange : 1.0);
-};
-
-DygraphLayout.prototype._evaluateLineCharts = function() {
- // add all the rects
- this.points = new Array();
- for (var setName in this.datasets) {
- var dataset = this.datasets[setName];
- for (var j = 0; j < dataset.length; j++) {
- var item = dataset[j];
- var point = {
- x: ((parseFloat(item[0]) - this.minxval) * this.xscale),
- y: 1.0 - ((parseFloat(item[1]) - this.minyval) * this.yscale),
- xval: parseFloat(item[0]),
- yval: parseFloat(item[1]),
- name: setName
- };
-
- // limit the x, y values so they do not overdraw
- if (point.y <= 0.0) {
- point.y = 0.0;
- }
- if (point.y >= 1.0) {
- point.y = 1.0;
- }
- if ((point.x >= 0.0) && (point.x <= 1.0)) {
- this.points.push(point);
- }
- }
- }
-};
-
-DygraphLayout.prototype._evaluateLineTicks = function() {
- this.xticks = new Array();
- for (var i = 0; i < this.options.xTicks.length; i++) {
- var tick = this.options.xTicks[i];
- var label = tick.label;
- var pos = this.xscale * (tick.v - this.minxval);
- if ((pos >= 0.0) && (pos <= 1.0)) {
- this.xticks.push([pos, label]);
- }
- }
-
- this.yticks = new Array();
- for (var i = 0; i < this.options.yTicks.length; i++) {
- var tick = this.options.yTicks[i];
- var label = tick.label;
- var pos = 1.0 - (this.yscale * (tick.v - this.minyval));
- if ((pos >= 0.0) && (pos <= 1.0)) {
- this.yticks.push([pos, label]);
- }
- }
-};
-
-
-/**
- * Behaves the same way as PlotKit.Layout, but also copies the errors
- * @private
- */
-DygraphLayout.prototype.evaluateWithError = function() {
- this.evaluate();
- if (!this.options.errorBars) return;
-
- // Copy over the error terms
- var i = 0; // index in this.points
- for (var setName in this.datasets) {
- var j = 0;
- var dataset = this.datasets[setName];
- for (var 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) {
- this.points[i].errorMinus = parseFloat(item[2]);
- this.points[i].errorPlus = parseFloat(item[3]);
- }
- }
- }
-};
-
-/**
- * Convenience function to remove all the data sets from a graph
- */
-DygraphLayout.prototype.removeAllDatasets = function() {
- delete this.datasets;
- this.datasets = new Array();
-};
-
-/**
- * Change the values of various layout options
- * @param {Object} new_options an associative array of new properties
- */
-DygraphLayout.prototype.updateOptions = function(new_options) {
- MochiKit.Base.update(this.options, new_options ? new_options : {});
-};
-
-// Subclass PlotKit.CanvasRenderer to add:
-// 1. X/Y grid overlay
-// 2. Ability to draw error bars (if required)
-
-/**
- * Sets some PlotKit.CanvasRenderer options
+ * 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.
- * @param {Object} options Options to pass on to CanvasRenderer
+ * @constructor
*/
-DygraphCanvasRenderer = function(dygraph, element, layout, options) {
- // TODO(danvk): remove options, just use dygraph.attr_.
- this.dygraph_ = dygraph;
- // default options
- this.options = {
- "strokeWidth": 0.5,
- "drawXAxis": true,
- "drawYAxis": true,
- "axisLineColor": Color.blackColor(),
- "axisLineWidth": 0.5,
- "axisTickSize": 3,
- "axisLabelColor": Color.blackColor(),
- "axisLabelFont": "Arial",
- "axisLabelFontSize": 9,
- "axisLabelWidth": 50,
- "drawYGrid": true,
- "drawXGrid": true,
- "gridLineColor": 'rgb(0.5,0.5,0.5)'
- };
- MochiKit.Base.update(this.options, options);
+/*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;
- // Stuff relating to Canvas on IE support
- this.isIE = (/MSIE/.test(navigator.userAgent) && !window.opera);
-
- if (this.isIE && !isNil(G_vmlCanvasManager)) {
- this.IEDelay = 0.5;
- this.maxTries = 5;
- this.renderDelay = null;
- this.clearDelay = null;
- this.element = G_vmlCanvasManager.initElement(this.element);
- }
-
this.height = this.element.height;
this.width = this.element.width;
throw "Canvas is not supported.";
// internal state
- this.xlabels = new Array();
- this.ylabels = new Array();
-
- this.area = {
- x: this.options.yAxisLabelWidth + 2 * this.options.axisTickSize,
- y: 0
- };
- this.area.w = this.width - this.area.x - this.options.rightGap;
- this.area.h = this.height - this.options.axisLabelFontSize -
- 2 * this.options.axisTickSize;
+ 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 {
this.clearDelay.cancel();
this.clearDelay = null;
}
- var context = this.element.getContext("2d");
+ 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));
+ // this.clearDelay = MochiKit.Async.wait(this.IEDelay);
+ // this.clearDelay.addCallback(bind(this.clear, this));
return;
}
}
- var context = this.element.getContext("2d");
+ context = this.elementContext;
context.clearRect(0, 0, this.width, this.height);
- for (var i = 0; i < this.xlabels.length; i++) {
- var el = this.xlabels[i];
- el.parentNode.removeChild(el);
+ function removeArray(ary) {
+ for (var i = 0; i < ary.length; i++) {
+ var el = ary[i];
+ if (el.parentNode) el.parentNode.removeChild(el);
+ }
}
- for (var i = 0; i < this.ylabels.length; i++) {
- var el = this.ylabels[i];
- 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 = new Array();
- this.ylabels = new Array();
+ this.xlabels = [];
+ this.ylabels = [];
+ this.annotations = [];
+ this.chartLabels = {};
};
DygraphCanvasRenderer.isSupported = function(canvasName) {
var canvas = null;
try {
- if (MochiKit.Base.isUndefinedOrNull(canvasName))
+ if (typeof(canvasName) == 'undefined' || canvasName === null) {
canvas = document.createElement("canvas");
- else
+ } else {
canvas = canvasName;
- var context = canvas.getContext("2d");
+ }
+ canvas.getContext("2d");
}
catch (e) {
var ie = navigator.appVersion.match(/MSIE (\d\.\d)/);
};
/**
+ * @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
- var ctx = this.element.getContext("2d");
- if (this.options.drawYGrid) {
- var ticks = this.layout.yticks;
+ // 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.options.gridLineColor;
- ctx.lineWidth = this.options.axisLineWidth;
- for (var i = 0; i < ticks.length; i++) {
- var x = this.area.x;
- var y = this.area.y + ticks[i][0] * this.area.h;
+ 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);
}
}
- if (this.options.drawXGrid) {
- var ticks = this.layout.xticks;
+ if (this.attr_('drawXGrid')) {
+ ticks = this.layout.xticks;
ctx.save();
- ctx.strokeStyle = this.options.gridLineColor;
- ctx.lineWidth = this.options.axisLineWidth;
- for (var i=0; i<ticks.length; i++) {
- var x = this.area.x + ticks[i][0] * this.area.w;
- var y = this.area.y + this.area.h;
+ 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);
}
// Do the ordinary rendering, as before
- // TODO(danvk) Call super.render()
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.options.drawXAxis && !this.options.drawYAxis)
- return;
+ 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 context = this.element.getContext("2d");
+ var label, x, y, tick, i;
var labelStyle = {
- "position": "absolute",
- "fontSize": this.options.axisLabelFontSize + "px",
- "zIndex": 10,
- "color": this.options.axisLabelColor.toRGBString(),
- "width": this.options.axisLabelWidth + "px",
- "overflow": "hidden"
+ 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) {
+ var makeDiv = function(txt, axis, prec_axis) {
var div = document.createElement("div");
for (var name in labelStyle) {
- div.style[name] = labelStyle[name];
+ if (labelStyle.hasOwnProperty(name)) {
+ div.style[name] = labelStyle[name];
+ }
}
- div.appendChild(document.createTextNode(txt));
+ 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.appendChild(document.createTextNode(txt));
+ div.appendChild(inner_div);
return div;
};
// axis lines
context.save();
- context.strokeStyle = this.options.axisLineColor.toRGBString();
- context.lineWidth = this.options.axisLineWidth;
-
- if (this.options.drawYAxis) {
- if (this.layout.yticks) {
- for (var i = 0; i < this.layout.yticks.length; i++) {
- var tick = this.layout.yticks[i];
+ 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;
- var x = this.area.x;
- var y = this.area.y + tick[0] * this.area.h;
+ 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(x, y);
- context.lineTo(x - this.options.axisTickSize, y);
+ context.moveTo(halfUp(x), halfDown(y));
+ context.lineTo(halfUp(x - sgn * this.attr_('axisTickSize')), halfDown(y));
context.closePath();
context.stroke();
+ */
- var label = makeDiv(tick[1]);
- var top = (y - this.options.axisLabelFontSize / 2);
+ 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.options.axisLabelFontSize + 3 > this.height) {
+ if (top + this.attr_('axisLabelFontSize') + 3 > this.height) {
label.style.bottom = "0px";
} else {
label.style.top = top + "px";
}
- label.style.left = "0px";
- label.style.textAlign = "right";
- label.style.width = this.options.yAxisLabelWidth + "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);
}
// 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.options.axisLabelFontSize;
- var bottom = parseInt(bottomTick.style.top) + fontSize;
+ 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) -
+ 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(this.area.x, this.area.y);
- context.lineTo(this.area.x, this.area.y + this.area.h);
+ 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.options.drawXAxis) {
+ if (this.attr_('drawXAxis')) {
if (this.layout.xticks) {
- for (var i = 0; i < this.layout.xticks.length; i++) {
- var tick = this.layout.xticks[i];
- if (typeof(dataset) == "function") return;
+ 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;
- var x = this.area.x + tick[0] * this.area.w;
- var y = this.area.y + this.area.h;
+ /* Tick marks are currently clipped, so don't bother drawing them.
context.beginPath();
- context.moveTo(x, y);
- context.lineTo(x, y + this.options.axisTickSize);
+ context.moveTo(halfUp(x), halfDown(y));
+ context.lineTo(halfUp(x), halfDown(y + this.attr_('axisTickSize')));
context.closePath();
context.stroke();
+ */
- var label = makeDiv(tick[1]);
+ label = makeDiv(tick[1], 'x');
label.style.textAlign = "center";
- label.style.bottom = "0px";
+ label.style.top = (y + this.attr_('axisTickSize')) + 'px';
- var left = (x - this.options.axisLabelWidth/2);
- if (left + this.options.axisLabelWidth > this.width) {
- left = this.width - this.options.xAxisLabelWidth;
+ 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) {
}
label.style.left = left + "px";
- label.style.width = this.options.xAxisLabelWidth + "px";
+ label.style.width = this.attr_('xAxisLabelWidth') + "px";
this.container.appendChild(label);
this.xlabels.push(label);
}
}
context.beginPath();
- context.moveTo(this.area.x, this.area.y + this.area.h);
- context.lineTo(this.area.x + this.area.w, this.area.y + this.area.h);
+ 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();
}
};
+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;
+ }
+
+ if (this.attr_('ylabel')) {
+ var box = {
+ left: 0,
+ top: this.area.y,
+ width: this.attr_('yLabelWidth'),
+ height: this.area.h
+ };
+ // TODO(danvk): is this outer div actually necessary?
+ div = document.createElement("div");
+ div.style.position = 'absolute';
+ div.style.left = box.left;
+ div.style.top = box.top + 'px';
+ div.style.width = box.width + 'px';
+ div.style.height = box.height + 'px';
+ div.style.fontSize = (this.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.
+ inner_div.style.transform = 'rotate(-90deg)'; // HTML5
+ inner_div.style.WebkitTransform = 'rotate(-90deg)'; // Safari/Chrome
+ inner_div.style.MozTransform = 'rotate(-90deg)'; // Firefox
+ inner_div.style.OTransform = 'rotate(-90deg)'; // Opera
+ inner_div.style.msTransform = 'rotate(-90deg)'; // 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=3)';
+ inner_div.style.left = '0px';
+ inner_div.style.top = '0px';
+ }
+
+ class_div = document.createElement("div");
+ class_div.className = 'dygraph-label dygraph-ylabel';
+ class_div.innerHTML = this.attr_('ylabel');
+
+ inner_div.appendChild(class_div);
+ div.appendChild(inner_div);
+ this.container.appendChild(div);
+ this.chartLabels.ylabel = 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();
+ }
+};
+
+
/**
- * Overrides the CanvasRenderer method to draw error bars
+ * Actually draw the lines chart, including error bars.
+ * TODO(danvk): split this into several smaller functions.
+ * @private
*/
DygraphCanvasRenderer.prototype._renderLineChart = function() {
- var context = this.element.getContext("2d");
- var colorCount = this.options.colorScheme.length;
- var colorScheme = this.options.colorScheme;
- var setNames = MochiKit.Base.keys(this.layout.datasets);
- var errorBars = this.layout.options.errorBars;
+ 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;
- var bind = MochiKit.Base.bind;
- var partial = MochiKit.Base.partial;
- //Update Points
- for (var i = 0; i < this.layout.points.length; i++) {
- var point = this.layout.points[i];
+ // 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 isOK = function(x) { return x && !isNaN(x); };
- var makePath = function(ctx) {
- for (var i = 0; i < setCount; i++) {
- var setName = setNames[i];
- var color = colorScheme[i%colorCount];
- var strokeX = this.options.strokeColorTransform;
+ 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
- context.save();
- context.strokeStyle = color.toRGBString();
- context.lineWidth = this.options.strokeWidth;
- var point = this.layout.points[0];
- var pointSize = this.dygraph_.attr_("pointSize");
- var prevX = null, prevY = null;
- var drawPoints = this.dygraph_.attr_("drawPoints");
- var points = this.layout.points;
- for (var j = 0; j < points.length; j++) {
- var point = points[j];
+ 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 (!isOK(point.canvasy)) {
- // this will make us move to the next point, not draw a line to it.
- prevX = prevY = null;
+ if (!Dygraph.isOK(point.y)) {
+ prevX = NaN;
+ continue;
+ }
+
+ // TODO(danvk): here
+ if (stepPlot) {
+ newYs = [ point.y_bottom, point.y_top ];
+ prevY = point.y;
} 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 ||
- !isOK(points[j+1].canvasy)));
-
- if (!prevX) {
- prevX = point.canvasx;
- prevY = point.canvasy;
+ 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.beginPath();
- ctx.moveTo(prevX, prevY);
- prevX = point.canvasx;
- prevY = point.canvasy;
- ctx.lineTo(prevX, prevY);
- ctx.stroke();
+ ctx.moveTo(prevX, prevYs[0]);
}
-
- if (drawPoints || isIsolated) {
- ctx.beginPath();
- ctx.fillStyle = color.toRGBString();
- ctx.arc(point.canvasx, point.canvasy, pointSize, 0, 360, false);
- ctx.fill();
+ 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();
}
- };
-
- var makeErrorBars = function(ctx) {
- for (var i = 0; i < setCount; i++) {
- var setName = setNames[i];
- var color = colorScheme[i % colorCount];
- var strokeX = this.options.strokeColorTransform;
+ } 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
- context.save();
- context.strokeStyle = color.toRGBString();
- context.lineWidth = this.options.strokeWidth;
- var prevX = -1;
- var prevYs = [-1, -1];
- var count = 0;
- var yscale = this.layout.yscale;
- // should be same color as the lines
- var err_color = color.colorWithAlpha(0.15);
- ctx.fillStyle = err_color.toRGBString();
+ 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 (var j = 0; j < this.layout.points.length; j++) {
- var point = this.layout.points[j];
- count++;
+ for (j = 0; j < pointsLength; j++) {
+ point = points[j];
if (point.name == setName) {
- if (!point.y || isNaN(point.y)) {
- prevX = -1;
- return;
+ if (!Dygraph.isOK(point.y)) {
+ prevX = NaN;
+ continue;
}
- var newYs = [ point.y - point.errorPlus * yscale,
- point.y + point.errorMinus * yscale ];
- newYs[0] = this.area.h * newYs[0] + this.area.y;
- newYs[1] = this.area.h * newYs[1] + this.area.y;
- if (prevX >= 0) {
+ 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]);
- ctx.lineTo(point.canvasx, newYs[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[0] = newYs[0];
- prevYs[1] = newYs[1];
+ 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);
+ 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');
+ ctx.moveTo(prevX, prevY);
+ ctx.lineTo(point.canvasx, prevY);
+ 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;
+ ctx.moveTo(prevX, prevY);
+ if (stepPlot) {
+ ctx.lineTo(point.canvasx, prevY);
+ }
+ prevX = point.canvasx;
+ prevY = point.canvasy;
+ ctx.lineTo(prevX, prevY);
+ 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;
+ }
- if (errorBars)
- bind(makeErrorBars, this)(context);
- bind(makePath, this)(context);
context.restore();
};
projects / dygraphs.git / blobdiff