-// 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
* - error bars
*/
/**
- * 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.
- Dygraph.update(this.options, options ? options : {});
- this.datasets = new Array();
- this.annotations = 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.setAnnotations = function(ann) {
- // The Dygraph object's annotations aren't parsed. We parse them here and
- // save a copy.
- this.annotations = [];
- var parse = this.attr_('xValueParser');
- 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.evaluate = function() {
- this._evaluateLimits();
- this._evaluateLineCharts();
- this._evaluateLineTicks();
- this._evaluateAnnotations();
-};
-
-DygraphLayout.prototype._evaluateLimits = function() {
- this.minxval = this.maxxval = null;
- if (this.options.dateWindow) {
- this.minxval = this.options.dateWindow[0];
- this.maxxval = this.options.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.options.yAxes.length; i++) {
- var axis = this.options.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);
-
- axis.ylogrange = Dygraph.log10(axis.maxyval) - Dygraph.log10(axis.minyval);
- axis.ylogscale = (axis.ylogrange != 0 ? 1.0 / axis.ylogrange : 1.0);
- }
-};
-
-DygraphLayout.prototype._evaluateLineCharts = function() {
- // add all the rects
- this.points = new Array();
- for (var setName in this.datasets) {
- if (!this.datasets.hasOwnProperty(setName)) continue;
-
- var dataset = this.datasets[setName];
- var axis = this.options.yAxes[this.options.seriesToAxisMap[setName]];
-
- for (var j = 0; j < dataset.length; j++) {
- var item = dataset[j];
-
- var yval;
- if (this.dygraph_.attr_("logscale")) {
- yval = 1.0 - ((Dygraph.log10(parseFloat(item[1])) - Dygraph.log10(axis.minyval)) * axis.ylogscale); // really should just be yscale.
- } else {
- yval = 1.0 - ((parseFloat(item[1]) - axis.minyval) * axis.yscale);
- }
- var point = {
- // TODO(danvk): here
- x: ((parseFloat(item[0]) - this.minxval) * this.xscale),
- y: yval,
- xval: parseFloat(item[0]),
- yval: parseFloat(item[1]),
- name: setName
- };
-
- 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.yAxes.length; i++ ) {
- var axis = this.options.yAxes[i];
- for (var j = 0; j < axis.ticks.length; j++) {
- var tick = axis.ticks[j];
- var label = tick.label;
- var 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.options.errorBars) 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];
- 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]);
- }
- }
- }
-};
-
-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 annotations = {};
- for (var i = 0; i < this.annotations.length; i++) {
- var a = this.annotations[i];
- annotations[a.xval + "," + a.series] = a;
- }
-
- this.annotated_points = [];
- for (var 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
+ * 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
*/
-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) {
- Dygraph.update(this.options, new_options ? new_options : {});
-};
+/*jshint globalstrict: true */
+/*global Dygraph:false,RGBColor:false */
+"use strict";
-/**
- * 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 i in point) {
- unstackedPoint[i] = point[i];
- }
-
- 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;
-}
-
-// Subclass PlotKit.CanvasRenderer to add:
-// 1. X/Y grid overlay
-// 2. Ability to draw error bars (if required)
-/**
- * Sets some PlotKit.CanvasRenderer options
- * @param {Object} element The canvas to attach to
- * @param {Layout} layout The DygraphLayout object for this graph.
- * @param {Object} options Options to pass on to CanvasRenderer
- */
-DygraphCanvasRenderer = function(dygraph, element, layout, options) {
- // TODO(danvk): remove options, just use dygraph.attr_.
+var DygraphCanvasRenderer = function(dygraph, element, elementContext, layout) {
this.dygraph_ = dygraph;
- // default options
- this.options = {
- "strokeWidth": 0.5,
- "drawXAxis": true,
- "drawYAxis": true,
- "axisLineColor": "black",
- "axisLineWidth": 0.5,
- "axisTickSize": 3,
- "axisLabelColor": "black",
- "axisLabelFont": "Arial",
- "axisLabelFontSize": 9,
- "axisLabelWidth": 50,
- "drawYGrid": true,
- "drawXGrid": true,
- "gridLineColor": "rgb(128,128,128)",
- "fillAlpha": 0.15,
- "underlayCallback": null
- };
- Dygraph.update(this.options, options);
-
this.layout = layout;
this.element = element;
+ this.elementContext = elementContext;
this.container = this.element.parentNode;
this.height = this.element.height;
throw "Canvas is not supported.";
// internal state
- this.xlabels = new Array();
- this.ylabels = new Array();
- this.annotations = new Array();
-
- // TODO(danvk): consider all axes in this computation.
- this.area = {
- // TODO(danvk): per-axis setting.
- 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;
-
- // Shrink the drawing area to accomodate additional y-axes.
- if (this.dygraph_.numAxes() == 2) {
- // TODO(danvk): per-axis setting.
- this.area.w -= (this.options.yAxisLabelWidth + 2 * this.options.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() + ")");
- }
+ 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.
- var ctx = this.dygraph_.canvas_.getContext("2d");
- ctx.beginPath();
- ctx.rect(this.area.x, this.area.y, this.area.w, this.area.h);
- ctx.clip();
-
- ctx = this.dygraph_.hidden_.getContext("2d");
- 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();
+ }
+ }
};
DygraphCanvasRenderer.prototype.attr_ = function(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];
- 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);
+ 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.annotations.length; i++) {
- var el = this.annotations[i];
+
+ 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.annotations = new Array();
+ this.xlabels = [];
+ this.ylabels = [];
+ this.annotations = [];
+ this.chartLabels = {};
};
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.
+ */
+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.element.getContext("2d");
- function halfUp(x){return Math.round(x)+0.5};
- function halfDown(y){return Math.round(y)-0.5};
+ var ctx = this.elementContext;
+ function halfUp(x) { return Math.round(x) + 0.5; }
+ function halfDown(y){ return Math.round(y) - 0.5; }
- if (this.options.underlayCallback) {
+ 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.options.underlayCallback(ctx, this.area, this.dygraph_, this.dygraph_);
+ this.attr_('underlayCallback')(ctx, this.area, this.dygraph_, this.dygraph_);
}
- if (this.options.drawYGrid) {
- var ticks = this.layout.yticks;
+ 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++) {
+ 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;
- var x = halfUp(this.area.x);
- var y = halfDown(this.area.y + ticks[i][1] * this.area.h);
+ 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 = halfUp(this.area.x + ticks[i][0] * this.area.w);
- var y = halfDown(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
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};
+ function halfUp(x) { return Math.round(x) + 0.5; }
+ function halfDown(y){ return Math.round(y) - 0.5; }
- var context = this.element.getContext("2d");
+ var context = this.elementContext;
+
+ var label, x, y, tick, i;
var labelStyle = {
- "position": "absolute",
- "fontSize": this.options.axisLabelFontSize + "px",
- "zIndex": 10,
- "color": this.options.axisLabelColor,
- "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) {
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.innerHTML=txt;
+ div.appendChild(inner_div);
return div;
};
// axis lines
context.save();
- context.strokeStyle = this.options.axisLineColor;
- context.lineWidth = this.options.axisLineWidth;
+ context.strokeStyle = this.attr_('axisLineColor');
+ context.lineWidth = this.attr_('axisLineWidth');
- if (this.options.drawYAxis) {
+ 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];
+ 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;
+ 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';
}
- var y = this.area.y + tick[1] * this.area.h;
+ 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.options.axisTickSize), halfDown(y));
+ context.lineTo(halfUp(x - sgn * this.attr_('axisTickSize')), halfDown(y));
context.closePath();
context.stroke();
+ */
- var label = makeDiv(tick[2]);
- 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";
}
- if (tick[0] == 0) {
- label.style.left = "0px";
+ 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.options.axisTickSize) + "px";
+ this.attr_('axisTickSize')) + "px";
label.style.textAlign = "left";
}
- label.style.width = this.options.yAxisLabelWidth + "px";
+ 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";
}
}
}
}
- 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(halfUp(x), halfDown(y));
- context.lineTo(halfUp(x), halfDown(y + this.options.axisTickSize));
+ 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);
}
};
+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.options.axisLabelFontSize + "px",
+ "fontSize": this.attr_('axisLabelFontSize') + "px",
"zIndex": 10,
"overflow": "hidden"
};
self.dygraph_.attr_(classEventName)(a, p, self.dygraph_,e );
}
};
- }
+ };
// Get a list of point with annotations.
var points = this.layout.annotated_points;
this.container.appendChild(div);
this.annotations.push(div);
- var ctx = this.element.getContext("2d");
+ var ctx = this.elementContext;
ctx.strokeStyle = this.colors[p.name];
ctx.beginPath();
if (!a.attachAtBottom) {
/**
- * 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 isNullOrNaN = function(x) {
+ return (x === null || isNaN(x));
+ };
+
// TODO(danvk): use this.attr_ for many of these.
- var context = this.element.getContext("2d");
- var colorCount = this.options.colorScheme.length;
- var colorScheme = this.options.colorScheme;
- var fillAlpha = this.options.fillAlpha;
- var errorBars = this.layout.options.errorBars;
+ 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.layout.options.stackedGraph;
- var stepPlot = this.layout.options.stepPlot;
+ 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) {
}
var setCount = setNames.length;
- this.colors = {}
- for (var i = 0; i < setCount; i++) {
- this.colors[setNames[i]] = colorScheme[i % colorCount];
+ // 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 (var i = 0; i < this.layout.points.length; i++) {
- var point = this.layout.points[i];
+ 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 ctx = context;
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.layout.options.yAxes[
- this.layout.options.seriesToAxisMap[setName]];
- var color = this.colors[setName];
+ for (i = 0; i < setCount; i++) {
+ setName = setNames[i];
+ axis = this.dygraph_.axisPropertiesForSeries(setName);
+ color = this.colors[setName];
// setup graphics context
ctx.save();
- var prevX = NaN;
- var prevY = NaN;
- var prevYs = [-1, -1];
- var yscale = axis.yscale;
+ prevX = NaN;
+ prevY = NaN;
+ prevYs = [-1, -1];
+ 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 + ',' +
+ 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];
+ for (j = 0; j < pointsLength; j++) {
+ point = points[j];
if (point.name == setName) {
- if (!isOK(point.y)) {
+ if (!Dygraph.isOK(point.y)) {
prevX = NaN;
continue;
}
// TODO(danvk): here
if (stepPlot) {
- var newYs = [ prevY - point.errorPlus * yscale,
- prevY + point.errorMinus * yscale ];
+ newYs = [ point.y_bottom, point.y_top ];
prevY = point.y;
} else {
- var newYs = [ point.y - point.errorPlus * yscale,
- point.y + point.errorMinus * yscale ];
+ 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;
ctx.fill();
}
} else if (fillGraph) {
- var baseline = [] // for stacked graphs: baseline for filling
+ 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.layout.options.yAxes[
- this.layout.options.seriesToAxisMap[setName]];
+ 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;
// setup graphics context
ctx.save();
- var prevX = NaN;
- var prevYs = [-1, -1];
- var yscale = axis.yscale;
+ prevX = NaN;
+ prevYs = [-1, -1];
+ 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 + ',' +
+ 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];
+ for (j = 0; j < pointsLength; j++) {
+ point = points[j];
if (point.name == setName) {
- if (!isOK(point.y)) {
+ if (!Dygraph.isOK(point.y)) {
prevX = NaN;
continue;
}
- var newYs;
if (stackedGraph) {
- lastY = baseline[point.canvasx];
+ var lastY = baseline[point.canvasx];
if (lastY === undefined) lastY = axisY;
baseline[point.canvasx] = point.canvasy;
newYs = [ point.canvasy, lastY ];
}
}
- for (var i = 0; i < setCount; i++) {
- var setName = setNames[i];
- var color = this.colors[setName];
+ // 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 point = this.layout.points[0];
var pointSize = this.dygraph_.attr_("pointSize", setName);
- var prevX = null, prevY = null;
+ prevX = null;
+ prevY = null;
var drawPoints = this.dygraph_.attr_("drawPoints", setName);
- var points = this.layout.points;
- for (var j = 0; j < points.length; j++) {
- var point = points[j];
- if (point.name == setName) {
- if (!isOK(point.canvasy)) {
- if (stepPlot && prevX != null) {
- // Draw a horizontal line to the start of the missing data
+ var strokePattern = this.dygraph_.attr_("strokePattern", setName);
+ if (!Dygraph.isArrayLike(strokePattern)) {
+ strokePattern = null;
+ }
+ for (j = firstIndexInSet; j < afterLastIndexInSet; j++) {
+ point = points[j];
+ if (isNullOrNaN(point.canvasy)) {
+ if (stepPlot && prevX !== null) {
+ // Draw a horizontal line to the start of the missing data
+ ctx.beginPath();
+ ctx.strokeStyle = color;
+ ctx.lineWidth = this.attr_('strokeWidth');
+ this._dashedLine(ctx, prevX, prevY, point.canvasx, prevY, strokePattern);
+ ctx.stroke();
+ }
+ // this will make us move to the next point, not draw a line to it.
+ prevX = prevY = null;
+ } else {
+ // A point is "isolated" if it is non-null but both the previous
+ // and next points are null.
+ var isIsolated = (!prevX && (j == points.length - 1 ||
+ isNullOrNaN(points[j+1].canvasy)));
+ if (prevX === null) {
+ prevX = point.canvasx;
+ prevY = point.canvasy;
+ } else {
+ // Skip over points that will be drawn in the same pixel.
+ if (Math.round(prevX) == Math.round(point.canvasx) &&
+ Math.round(prevY) == Math.round(point.canvasy)) {
+ continue;
+ }
+ // TODO(antrob): skip over points that lie on a line that is already
+ // going to be drawn. There is no need to have more than 2
+ // consecutive points that are collinear.
+ if (strokeWidth) {
ctx.beginPath();
ctx.strokeStyle = color;
- ctx.lineWidth = this.options.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 ||
- !isOK(points[j+1].canvasy)));
-
- if (!prevX) {
+ ctx.lineWidth = strokeWidth;
+ if (stepPlot) {
+ this._dashedLine(ctx, prevX, prevY, point.canvasx, prevY, strokePattern);
+ }
+ this._dashedLine(ctx, prevX, prevY, point.canvasx, point.canvasy, strokePattern);
prevX = point.canvasx;
prevY = point.canvasy;
- } else {
- // TODO(danvk): figure out why this conditional is necessary.
- 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();
- }
+ ctx.stroke();
}
+ }
- if (drawPoints || isIsolated) {
- ctx.beginPath();
- ctx.fillStyle = color;
- ctx.arc(point.canvasx, point.canvasy, pointSize,
- 0, 2 * Math.PI, false);
- ctx.fill();
- }
+ if (drawPoints || isIsolated) {
+ ctx.beginPath();
+ ctx.fillStyle = color;
+ ctx.arc(point.canvasx, point.canvasy, pointSize,
+ 0, 2 * Math.PI, false);
+ ctx.fill();
}
}
}
+ firstIndexInSet = afterLastIndexInSet;
}
context.restore();
};
+
+/**
+ * This does dashed lines onto a canvas for a given pattern. You must call
+ * ctx.stroke() after to actually draw it, much line ctx.lineTo(). It remembers
+ * the state of the line in regards to where we left off on drawing the pattern.
+ * You can draw a dashed line in several function calls and the pattern will be
+ * continous as long as you didn't call this function with a different pattern
+ * in between.
+ * @param ctx The canvas 2d context to draw on.
+ * @param x The start of the line's x coordinate.
+ * @param y The start of the line's y coordinate.
+ * @param x2 The end of the line's x coordinate.
+ * @param y2 The end of the line's y coordinate.
+ * @param pattern The dash pattern to draw, an array of integers where even
+ * index is drawn and odd index is not drawn (Ex. [10, 2, 5, 2], 10 is drawn 5
+ * is drawn, 2 is the space between.). A null pattern, array of length one, or
+ * empty array will do just a solid line.
+ * @private
+ */
+DygraphCanvasRenderer.prototype._dashedLine = function(ctx, x, y, x2, y2, pattern) {
+ // Original version http://stackoverflow.com/questions/4576724/dotted-stroke-in-canvas
+ // Modified by Russell Valentine to keep line history and continue the pattern
+ // where it left off.
+ var dx, dy, len, rot, patternIndex, segment;
+
+ // If we don't have a pattern or it is an empty array or of size one just
+ // do a solid line.
+ if (!pattern || pattern.length <= 1) {
+ ctx.moveTo(x, y);
+ ctx.lineTo(x2, y2);
+ return;
+ }
+
+ // If we have a different dash pattern than the last time this was called we
+ // reset our dash history and start the pattern from the begging
+ // regardless of state of the last pattern.
+ if (!Dygraph.compareArrays(pattern, this._dashedLineToHistoryPattern)) {
+ this._dashedLineToHistoryPattern = pattern;
+ this._dashedLineToHistory = [0, 0];
+ }
+ ctx.save();
+
+ // Calculate transformation parameters
+ dx = (x2-x);
+ dy = (y2-y);
+ len = Math.sqrt(dx*dx + dy*dy);
+ rot = Math.atan2(dy, dx);
+
+ // Set transformation
+ ctx.translate(x, y);
+ ctx.moveTo(0, 0);
+ ctx.rotate(rot);
+
+ // Set last pattern index we used for this pattern.
+ patternIndex = this._dashedLineToHistory[0];
+ x = 0;
+ while (len > x) {
+ // Get the length of the pattern segment we are dealing with.
+ segment = pattern[patternIndex];
+ // If our last draw didn't complete the pattern segment all the way we
+ // will try to finish it. Otherwise we will try to do the whole segment.
+ if (this._dashedLineToHistory[1]) {
+ x += this._dashedLineToHistory[1];
+ } else {
+ x += segment;
+ }
+ if (x > len) {
+ // We were unable to complete this pattern index all the way, keep
+ // where we are the history so our next draw continues where we left off
+ // in the pattern.
+ this._dashedLineToHistory = [patternIndex, x-len];
+ x = len;
+ } else {
+ // We completed this patternIndex, we put in the history that we are on
+ // the beginning of the next segment.
+ this._dashedLineToHistory = [(patternIndex+1)%pattern.length, 0];
+ }
+
+ // We do a line on a even pattern index and just move on a odd pattern index.
+ // The move is the empty space in the dash.
+ if(patternIndex % 2 === 0) {
+ ctx.lineTo(x, 0);
+ } else {
+ ctx.moveTo(x, 0);
+ }
+ // If we are not done, next loop process the next pattern segment, or the
+ // first segment again if we are at the end of the pattern.
+ patternIndex = (patternIndex+1) % pattern.length;
+ }
+ ctx.restore();
+};
projects / dygraphs.git / blobdiff