"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.xlabels = [];
this.ylabels = [];
this.annotations = [];
- this.chartLabels = {};
this.area = layout.getPlotArea();
this.container.style.position = "relative";
return this.dygraph_.attr_(x);
};
+/**
+ * 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) {
removeArray(this.ylabels);
removeArray(this.annotations);
- for (var k in this.chartLabels) {
- if (!this.chartLabels.hasOwnProperty(k)) continue;
- var el = this.chartLabels[k];
- if (el.parentNode) el.parentNode.removeChild(el);
- }
this.xlabels = [];
this.ylabels = [];
this.annotations = [];
- this.chartLabels = {};
};
-
+/**
+ * Checks whether the browser supports the <canvas> tag.
+ * @private
+ */
DygraphCanvasRenderer.isSupported = function(canvasName) {
var canvas = null;
try {
};
/**
- * Draw an X/Y grid on top of the existing plot
+ * 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.render = function() {
// Draw the new X/Y grid. Lines appear crisper when pixels are rounded to
// Do the ordinary rendering, as before
this._renderLineChart();
this._renderAxis();
- this._renderChartLabels();
- this._renderAnnotations();
+ // this._renderAnnotations();
};
DygraphCanvasRenderer.prototype._createIEClipArea = function() {
};
-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",
var setCount = setNames.length;
// TODO(danvk): Move this mapping into Dygraph and get it out of here.
- this.colors = {};
- for (i = 0; i < setCount; i++) {
- this.colors[setNames[i]] = this.colorScheme_[i % this.colorScheme_.length];
- }
+ this.colors = this.dygraph_.colorsMap_;
+ // for (i = 0; i < setCount; i++) {
+ // this.colors[setNames[i]] = this.colorScheme_[i % this.colorScheme_.length];
+ // }
// Update Points
// TODO(danvk): here
projects / dygraphs.git / blobdiff