-// 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.CanvasRenderer, but modified to meet the
* @param {Layout} layout The DygraphLayout object for this graph.
* @constructor
*/
-DygraphCanvasRenderer = function(dygraph, element, elementContext, layout) {
+
+/*jshint globalstrict: true */
+/*global Dygraph:false,RGBColor:false */
+"use strict";
+
+
+/**
+ * @constructor
+ *
+ * This gets called when there are "new points" to chart. This is generally the
+ * case when the underlying data being charted has changed. It is _not_ called
+ * in the common case that the user has zoomed or is panning the view.
+ *
+ * The chart canvas has already been created by the Dygraph object. The
+ * renderer simply gets a drawing context.
+ *
+ * @param {Dyraph} dygraph The chart to which this renderer belongs.
+ * @param {Canvas} element The <canvas> DOM element on which to draw.
+ * @param {CanvasRenderingContext2D} elementContext The drawing context.
+ * @param {DygraphLayout} layout The chart's DygraphLayout object.
+ *
+ * TODO(danvk): remove the elementContext property.
+ */
+var DygraphCanvasRenderer = function(dygraph, element, elementContext, layout) {
this.dygraph_ = dygraph;
this.layout = layout;
throw "Canvas is not supported.";
// internal state
- this.xlabels = new Array();
- this.ylabels = new Array();
- this.annotations = new Array();
- this.chartLabels = {};
-
- this.area = this.computeArea_();
+ 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.
- var ctx = this.dygraph_.canvas_ctx_;
- ctx.beginPath();
- ctx.rect(this.area.x, this.area.y, this.area.w, this.area.h);
- ctx.clip();
+ 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();
+ 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);
};
-// Compute the box which the chart should be drawn in. This is the canvas's
-// box, less space needed for axis and chart labels.
-// TODO(danvk): this belongs in DygraphLayout.
-DygraphCanvasRenderer.prototype.computeArea_ = 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.width - area.x - this.attr_('rightGap');
- area.h = this.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.
- }
-
- return area;
-};
-
+/**
+ * Clears out all chart content and DOM elements.
+ * This is called immediately before render() on every frame, including
+ * during zooms and pans.
+ * @private
+ */
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.elementContext;
+ 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.elementContext;
+ 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];
- if (el.parentNode) el.parentNode.removeChild(el);
- }
- for (var i = 0; i < this.ylabels.length; i++) {
- var el = this.ylabels[i];
- if (el.parentNode) el.parentNode.removeChild(el);
- }
- for (var i = 0; i < this.annotations.length; i++) {
- var el = this.annotations[i];
- if (el.parentNode) el.parentNode.removeChild(el);
- }
- 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.annotations = new Array();
- this.chartLabels = {};
};
-
+/**
+ * Checks whether the browser supports the <canvas> tag.
+ * @private
+ */
DygraphCanvasRenderer.isSupported = function(canvasName) {
var canvas = null;
try {
- if (typeof(canvasName) == 'undefined' || canvasName == null)
+ 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.
+ * This method is responsible for drawing everything on the chart, including
+ * lines, error bars, fills and axes.
+ * It is called immediately after clear() on every frame, including during pans
+ * and zooms.
+ * @private
*/
-DygraphCanvasRenderer.prototype.setColors = function(colors) {
- this.colorScheme_ = colors;
+DygraphCanvasRenderer.prototype.render = function() {
+ this._renderLineChart();
};
-/**
- * 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};
+DygraphCanvasRenderer.prototype._createIEClipArea = function() {
+ var className = 'dygraph-clip-div';
+ var graphDiv = this.dygraph_.graphDiv;
- 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_);
+ // 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]);
+ }
}
- if (this.attr_('drawYGrid')) {
- var ticks = this.layout.yticks;
- ctx.save();
- ctx.strokeStyle = this.attr_('gridLineColor');
- ctx.lineWidth = this.attr_('gridLineWidth');
- for (var i = 0; i < ticks.length; i++) {
- // TODO(danvk): allow secondary axes to draw a grid, too.
- if (ticks[i][0] != 0) continue;
- var x = halfUp(this.area.x);
- var 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();
+ // 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;
}
- if (this.attr_('drawXGrid')) {
- var ticks = this.layout.xticks;
- ctx.save();
- ctx.strokeStyle = this.attr_('gridLineColor');
- ctx.lineWidth = this.attr_('gridLineWidth');
- for (var i=0; i<ticks.length; i++) {
- var x = halfUp(this.area.x + ticks[i][0] * this.area.w);
- var y = halfDown(this.area.y + this.area.h);
- ctx.beginPath();
- ctx.moveTo(x, y);
- ctx.lineTo(x, this.area.y);
- ctx.closePath();
- ctx.stroke();
+ 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);
}
- // Do the ordinary rendering, as before
- this._renderLineChart();
- this._renderAxis();
- this._renderChartLabels();
- this._renderAnnotations();
+ 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 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",
- overflow: "hidden"
- };
- var makeDiv = function(txt, 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");
- // TODO(danvk): separate class for secondary y-axis
- inner_div.className = 'dygraph-axis-label dygraph-axis-label-' + axis;
- inner_div.appendChild(document.createTextNode(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) {
- for (var i = 0; i < this.layout.yticks.length; i++) {
- var tick = this.layout.yticks[i];
- if (typeof(tick) == "function") return;
- var x = this.area.x;
- var sgn = 1;
- if (tick[0] == 1) { // right-side y-axis
- x = this.area.x + this.area.w;
- sgn = -1;
- }
- var y = this.area.y + tick[1] * this.area.h;
- context.beginPath();
- context.moveTo(halfUp(x), halfDown(y));
- context.lineTo(halfUp(x - sgn * this.attr_('axisTickSize')), halfDown(y));
- context.closePath();
- context.stroke();
-
- var label = makeDiv(tick[2], 'y');
- 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);
- }
+/**
+ * Returns a predicate to be used with an iterator, which will
+ * iterate over points appropriately, depending on whether
+ * connectSeparatedPoints is true. When it's false, the predicate will
+ * skip over points with missing yVals.
+ */
+DygraphCanvasRenderer._getIteratorPredicate = function(connectSeparatedPoints) {
+ return connectSeparatedPoints
+ ? DygraphCanvasRenderer._predicateThatSkipsEmptyPoints
+ : null;
+};
- // 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) + fontSize;
- if (bottom > this.height - fontSize) {
- bottomTick.style.top = (parseInt(bottomTick.style.top) -
- fontSize / 2) + "px";
- }
- }
+DygraphCanvasRenderer._predicateThatSkipsEmptyPoints =
+ function(array, idx) {
+ return array[idx].yval !== null;
+};
- // 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();
- }
+/**
+ *
+ * @private
+ */
+DygraphCanvasRenderer.prototype._drawStyledLine = function(
+ ctx, i, setName, color, strokeWidth, strokePattern, drawPoints,
+ drawPointCallback, pointSize) {
+ // TODO(konigsberg): Compute attributes outside this method call.
+ var stepPlot = this.attr_("stepPlot");
+ var firstIndexInSet = this.layout.setPointsOffsets[i];
+ var setLength = this.layout.setPointsLengths[i];
+ var points = this.layout.points;
+ if (!Dygraph.isArrayLike(strokePattern)) {
+ strokePattern = null;
}
+ var drawGapPoints = this.dygraph_.attr_('drawGapEdgePoints', setName);
- 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;
-
- var x = this.area.x + tick[0] * this.area.w;
- var y = this.area.y + this.area.h;
- context.beginPath();
- context.moveTo(halfUp(x), halfDown(y));
- context.lineTo(halfUp(x), halfDown(y + this.attr_('axisTickSize')));
- context.closePath();
- context.stroke();
-
- var 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";
- }
+ var iter = Dygraph.createIterator(points, firstIndexInSet, setLength,
+ DygraphCanvasRenderer._getIteratorPredicate(
+ this.attr_("connectSeparatedPoints")));
- label.style.left = left + "px";
- label.style.width = this.attr_('xAxisLabelWidth') + "px";
- this.container.appendChild(label);
- this.xlabels.push(label);
- }
- }
+ var stroking = strokePattern && (strokePattern.length >= 2);
- 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();
+ ctx.save();
+ if (stroking) {
+ ctx.installPattern(strokePattern);
}
- context.restore();
-};
-
-
-DygraphCanvasRenderer.prototype._renderChartLabels = function() {
- // 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')) {
- var 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';
- var 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;
- }
+ var pointsOnLine = this._drawSeries(ctx, iter, strokeWidth, pointSize, drawPoints, drawGapPoints, stepPlot, color);
+ this._drawPointsOnLine(ctx, pointsOnLine, drawPointCallback, setName, color, pointSize);
- if (this.attr_('xlabel')) {
- var 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';
-
- var 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 (stroking) {
+ ctx.uninstallPattern();
}
- 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?
- var 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';
- }
-
- var 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;
- }
+ ctx.restore();
};
-
-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 );
- }
- };
+DygraphCanvasRenderer.prototype._drawPointsOnLine = function(ctx, pointsOnLine, drawPointCallback, setName, color, pointSize) {
+ for (var idx = 0; idx < pointsOnLine.length; idx++) {
+ var cb = pointsOnLine[idx];
+ ctx.save();
+ drawPointCallback(
+ this.dygraph_, setName, ctx, cb[0], cb[1], color, pointSize);
+ ctx.restore();
}
+}
- // 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;
- }
+DygraphCanvasRenderer.prototype._drawSeries = function(
+ ctx, iter, strokeWidth, pointSize, drawPoints, drawGapPoints,
+ stepPlot, color) {
- var a = p.annotation;
- var tick_height = 6;
- if (a.hasOwnProperty("tickHeight")) {
- tick_height = a.tickHeight;
- }
+ var prevCanvasX = null;
+ var prevCanvasY = null;
+ var nextCanvasY = null;
+ var isIsolated; // true if this point is isolated (no line segments)
+ var point; // the point being processed in the while loop
+ var pointsOnLine = []; // Array of [canvasx, canvasy] pairs.
+ var first = true; // the first cycle through the while loop
- var div = document.createElement("div");
- for (var name in annotationStyle) {
- if (annotationStyle.hasOwnProperty(name)) {
- div.style[name] = annotationStyle[name];
+ ctx.beginPath();
+ ctx.strokeStyle = color;
+ ctx.lineWidth = strokeWidth;
+
+ for (var i = iter.start_; i < iter.end_; i++) {
+ // while (iter.hasNext) {
+ point = iter.array_[i];
+ if (iter.predicate_) {
+ while (i < iter.end_ && !iter.predicate_(iter.array_, i)) {
+ i++;
}
- }
- if (!a.hasOwnProperty('icon')) {
- div.className = "dygraphDefaultAnnotation";
- }
- if (a.hasOwnProperty('cssClass')) {
- div.className += " " + a.cssClass;
+ if (i == iter.end_) break;
}
- 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);
+ if (point.canvasy === null || point.canvasy != point.canvasy) {
+ if (stepPlot && prevCanvasX !== null) {
+ // Draw a horizontal line to the start of the missing data
+ ctx.moveTo(prevX, prevY);
+ ctx.lineTo(point.canvasx, prevY);
+ }
+ prevCanvasX = prevCanvasY = null;
} else {
- ctx.moveTo(p.canvasx, this.area.h);
- ctx.lineTo(p.canvasx, this.area.h - 2 - tick_height);
+ isIsolated = false;
+ if (drawGapPoints || !prevCanvasX) {
+ // nextCanvasY = iter.hasNext ? iter.peek.canvasy : null;
+ // var next_i = i + 1;
+ // while (next_i < iter.end_ && (!iter.predicate_ || !iter.predicate_(iter.array_, next_i))) {
+ // next_i++;
+ // }
+ iter.nextIdx_ = i;
+ var peek = iter.next();
+ nextCanvasY = peek ? peek.canvasy : null;
+ // nextCanvasY = next_i < iter.end_ ? iter.array_[next_i].canvasy : null;
+
+ // TODO: we calculate isNullOrNaN for this point, and the next, and then,
+ // when we iterate, test for isNullOrNaN again. Why bother?
+ var isNextCanvasYNullOrNaN = nextCanvasY === null ||
+ nextCanvasY != nextCanvasY;
+ isIsolated = (!prevCanvasX && isNextCanvasYNullOrNaN);
+ if (drawGapPoints) {
+ // Also consider a point to be "isolated" if it's adjacent to a
+ // null point, excluding the graph edges.
+ if ((!first && !prevCanvasX) ||
+ (iter.hasNext && isNextCanvasYNullOrNaN)) {
+ isIsolated = true;
+ }
+ }
+ }
+
+ if (prevCanvasX !== null) {
+ if (strokeWidth) {
+ if (stepPlot) {
+ ctx.moveTo(prevCanvasX, prevCanvasY);
+ ctx.lineTo(point.canvasx, prevCanvasY);
+ prevCanvasX = point.canvasx;
+ }
+ ctx.moveTo(prevCanvasX, prevCanvasY);
+ ctx.lineTo(point.canvasx, point.canvasy);
+ }
+ }
+ if (drawPoints || isIsolated) {
+ pointsOnLine.push([point.canvasx, point.canvasy]);
+ }
+ prevCanvasX = point.canvasx;
+ prevCanvasY = point.canvasy;
}
- ctx.closePath();
- ctx.stroke();
+ first = false;
}
+ ctx.stroke();
+ return pointsOnLine;
};
+DygraphCanvasRenderer.prototype._drawLine = function(ctx, i) {
+ var setNames = this.layout.setNames;
+ var setName = setNames[i];
+
+ var strokeWidth = this.dygraph_.attr_("strokeWidth", setName);
+ var borderWidth = this.dygraph_.attr_("strokeBorderWidth", setName);
+ var drawPointCallback = this.dygraph_.attr_("drawPointCallback", setName) ||
+ Dygraph.Circles.DEFAULT;
+
+ if (borderWidth && strokeWidth) {
+ this._drawStyledLine(ctx, i, setName,
+ this.dygraph_.attr_("strokeBorderColor", setName),
+ strokeWidth + 2 * borderWidth,
+ this.dygraph_.attr_("strokePattern", setName),
+ this.dygraph_.attr_("drawPoints", setName),
+ drawPointCallback,
+ this.dygraph_.attr_("pointSize", setName));
+ }
+
+ this._drawStyledLine(ctx, i, setName,
+ this.colors[setName],
+ strokeWidth,
+ this.dygraph_.attr_("strokePattern", setName),
+ this.dygraph_.attr_("drawPoints", setName),
+ drawPointCallback,
+ this.dygraph_.attr_("pointSize", setName));
+};
/**
- * Overrides the CanvasRenderer method to draw error bars
+ * Actually draw the lines chart, including error bars.
+ * @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 ctx = this.elementContext;
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 i;
- var setNames = [];
- for (var name in this.layout.datasets) {
- if (this.layout.datasets.hasOwnProperty(name)) {
- setNames.push(name);
- }
- }
+ var setNames = this.layout.setNames;
var setCount = setNames.length;
- // TODO(danvk): Move this mapping into Dygraph and get it out of here.
- this.colors = {}
- for (var i = 0; i < setCount; i++) {
- this.colors[setNames[i]] = this.colorScheme_[i % this.colorScheme_.length];
- }
+ this.colors = this.dygraph_.colorsMap_;
// Update Points
// TODO(danvk): here
- for (var i = pointsLength; i--;) {
+ //
+ // TODO(bhs): this loop is a hot-spot for high-point-count charts. These
+ // transformations can be pushed into the canvas via linear transformation
+ // matrices.
+ var points = this.layout.points;
+ for (i = points.length; i--;) {
var 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;
+ // Draw any "fills", i.e. error bars or the filled area under a series.
+ // These must all be drawn before any lines, so that the main lines of a
+ // series are drawn on top.
if (errorBars) {
if (fillGraph) {
this.dygraph_.warn("Can't use fillGraph option with error bars");
}
- for (var i = 0; i < setCount; i++) {
- var setName = setNames[i];
- var axis = this.dygraph_.axisPropertiesForSeries(setName);
- var color = this.colors[setName];
-
- // setup graphics context
- ctx.save();
- var prevX = NaN;
- var prevY = NaN;
- var prevYs = [-1, -1];
- var yscale = axis.yscale;
- // should be same color as the lines but only 15% opaque.
- var rgb = new RGBColor(color);
- var err_color = 'rgba(' + rgb.r + ',' + rgb.g + ',' + rgb.b + ',' +
- fillAlpha + ')';
- ctx.fillStyle = err_color;
- ctx.beginPath();
- for (var j = 0; j < pointsLength; j++) {
- var point = points[j];
- if (point.name == setName) {
- if (!Dygraph.isOK(point.y)) {
- prevX = NaN;
- continue;
- }
+ ctx.save();
+ this.drawErrorBars_(points);
+ ctx.restore();
+ } else if (fillGraph) {
+ ctx.save();
+ this.drawFillBars_(points);
+ ctx.restore();
+ }
- // TODO(danvk): here
- if (stepPlot) {
- var newYs = [ point.y_bottom, point.y_top ];
- prevY = point.y;
- } else {
- var 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;
- }
+ // Drawing the lines.
+ for (i = 0; i < setCount; i += 1) {
+ this._drawLine(ctx, i);
+ }
+};
+
+/**
+ * Draws the shaded error bars/confidence intervals for each series.
+ * This happens before the center lines are drawn, since the center lines
+ * need to be drawn on top of the error bars for all series.
+ *
+ * @private
+ */
+DygraphCanvasRenderer.prototype.drawErrorBars_ = function(points) {
+ var ctx = this.elementContext;
+ var setNames = this.layout.setNames;
+ var setCount = setNames.length;
+ var fillAlpha = this.attr_('fillAlpha');
+ var stepPlot = this.attr_('stepPlot');
+
+ var newYs;
+
+ for (var i = 0; i < setCount; i++) {
+ var setName = setNames[i];
+ var axis = this.dygraph_.axisPropertiesForSeries(setName);
+ var color = this.colors[setName];
+
+ var firstIndexInSet = this.layout.setPointsOffsets[i];
+ var setLength = this.layout.setPointsLengths[i];
+
+ var iter = Dygraph.createIterator(points, firstIndexInSet, setLength,
+ DygraphCanvasRenderer._getIteratorPredicate(
+ this.attr_("connectSeparatedPoints")));
+
+ // setup graphics context
+ var prevX = NaN;
+ var prevY = NaN;
+ var prevYs = [-1, -1];
+ var yscale = axis.yscale;
+ // should be same color as the lines but only 15% opaque.
+ var rgb = new RGBColor(color);
+ var err_color =
+ 'rgba(' + rgb.r + ',' + rgb.g + ',' + rgb.b + ',' + fillAlpha + ')';
+ ctx.fillStyle = err_color;
+ ctx.beginPath();
+ while (iter.hasNext) {
+ var point = iter.next();
+ if (!Dygraph.isOK(point.y)) {
+ prevX = NaN;
+ continue;
}
- ctx.fill();
- }
- } else if (fillGraph) {
- var baseline = [] // for stacked graphs: baseline for filling
-
- // process sets in reverse order (needed for stacked graphs)
- for (var i = setCount - 1; i >= 0; i--) {
- var setName = setNames[i];
- var color = this.colors[setName];
- var 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();
- var prevX = NaN;
- var prevYs = [-1, -1];
- var yscale = axis.yscale;
- // should be same color as the lines but only 15% opaque.
- var rgb = new RGBColor(color);
- var err_color = 'rgba(' + rgb.r + ',' + rgb.g + ',' + rgb.b + ',' +
- fillAlpha + ')';
- ctx.fillStyle = err_color;
- ctx.beginPath();
- for (var j = 0; j < pointsLength; j++) {
- var point = points[j];
- if (point.name == setName) {
- if (!Dygraph.isOK(point.y)) {
- prevX = NaN;
- continue;
- }
- var newYs;
- if (stackedGraph) {
- 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;
+
+ // 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();
}
- ctx.fill();
+ prevYs = newYs;
+ prevX = point.canvasx;
}
+ ctx.fill();
}
+};
- // Drawing the lines.
- var firstIndexInSet = 0;
- var afterLastIndexInSet = 0;
- var setLength = 0;
- for (var i = 0; i < setCount; i += 1) {
- setLength = this.layout.setPointsLengths[i];
- afterLastIndexInSet += setLength;
+/**
+ * Draws the shaded regions when "fillGraph" is set. Not to be confused with
+ * error bars.
+ *
+ * @private
+ */
+DygraphCanvasRenderer.prototype.drawFillBars_ = function(points) {
+ var ctx = this.elementContext;
+ var setNames = this.layout.setNames;
+ var setCount = setNames.length;
+ var fillAlpha = this.attr_('fillAlpha');
+ var stepPlot = this.attr_('stepPlot');
+ var stackedGraph = this.attr_("stackedGraph");
+
+ var baseline = {}; // for stacked graphs: baseline for filling
+ var currBaseline;
+
+ // process sets in reverse order (needed for stacked graphs)
+ for (var i = setCount - 1; i >= 0; i--) {
var setName = setNames[i];
var color = this.colors[setName];
- var strokeWidth = this.dygraph_.attr_("strokeWidth", setName);
+ var 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;
+ var firstIndexInSet = this.layout.setPointsOffsets[i];
+ var setLength = this.layout.setPointsLengths[i];
+
+ var iter = Dygraph.createIterator(points, firstIndexInSet, setLength,
+ DygraphCanvasRenderer._getIteratorPredicate(
+ this.attr_("connectSeparatedPoints")));
// setup graphics context
- context.save();
- var pointSize = this.dygraph_.attr_("pointSize", setName);
- var prevX = null, prevY = null;
- var drawPoints = this.dygraph_.attr_("drawPoints", setName);
- for (var j = firstIndexInSet; j < afterLastIndexInSet; j++) {
- var 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;
+ var prevX = NaN;
+ var prevYs = [-1, -1];
+ var newYs;
+ var yscale = axis.yscale;
+ // should be same color as the lines but only 15% opaque.
+ var rgb = new RGBColor(color);
+ var err_color =
+ 'rgba(' + rgb.r + ',' + rgb.g + ',' + rgb.b + ',' + fillAlpha + ')';
+ ctx.fillStyle = err_color;
+ ctx.beginPath();
+ while(iter.hasNext) {
+ var point = iter.next();
+ if (!Dygraph.isOK(point.y)) {
+ prevX = NaN;
+ continue;
+ }
+ if (stackedGraph) {
+ currBaseline = baseline[point.canvasx];
+ var lastY;
+ if (currBaseline === undefined) {
+ lastY = axisY;
} 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;
+ if(stepPlot) {
+ lastY = currBaseline[0];
+ } else {
+ lastY = currBaseline;
}
- // 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();
+ }
+ newYs = [ point.canvasy, lastY ];
+
+ if(stepPlot) {
+ // Step plots must keep track of the top and bottom of
+ // the baseline at each point.
+ if(prevYs[0] === -1) {
+ baseline[point.canvasx] = [ point.canvasy, axisY ];
+ } else {
+ baseline[point.canvasx] = [ point.canvasy, prevYs[0] ];
}
+ } else {
+ baseline[point.canvasx] = point.canvasy;
}
- if (drawPoints || isIsolated) {
- ctx.beginPath();
- ctx.fillStyle = color;
- ctx.arc(point.canvasx, point.canvasy, pointSize,
- 0, 2 * Math.PI, false);
- ctx.fill();
+ } else {
+ newYs = [ point.canvasy, axisY ];
+ }
+ if (!isNaN(prevX)) {
+ ctx.moveTo(prevX, prevYs[0]);
+
+ if (stepPlot) {
+ ctx.lineTo(point.canvasx, prevYs[0]);
+ if(currBaseline) {
+ // Draw to the bottom of the baseline
+ ctx.lineTo(point.canvasx, currBaseline[1]);
+ } else {
+ ctx.lineTo(point.canvasx, newYs[1]);
+ }
+ } 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;
}
- firstIndexInSet = afterLastIndexInSet;
+ ctx.fill();
}
-
- context.restore();
};
projects / dygraphs.git / blobdiff