- *
- * High level overview of classes:
- *
- * - DygraphLayout
- * This contains all the data to be charted.
- * It uses data coordinates, but also records the chart range (in data
- * coordinates) and hence is able to calculate percentage positions ('In
- * this view, Point A lies 25% down the x-axis.')
- * Two things that it does not do are:
- * 1. Record pixel coordinates for anything.
- * 2. (oddly) determine anything about the layout of chart elements.
- * The naming is a vestige of Dygraph's original PlotKit roots.
- *
- * - DygraphCanvasRenderer
- * This class determines the charting area (in pixel coordinates), maps the
- * percentage coordinates in the DygraphLayout to pixels and draws them.
- * It's also responsible for creating chart DOM elements, i.e. annotations,
- * tick mark labels, the title and the x/y-axis labels.
- */
-
-/**
- * Creates a new DygraphLayout object.
- * @return {Object} The DygraphLayout object
- */
-DygraphLayout = function(dygraph) {
- this.dygraph_ = dygraph;
- this.datasets = new Array();
- this.annotations = new Array();
- this.yAxes_ = null;
-
- // TODO(danvk): it's odd that xTicks_ and yTicks_ are inputs, but xticks and
- // yticks are outputs. Clean this up.
- this.xTicks_ = null;
- this.yTicks_ = null;
-};
-
-DygraphLayout.prototype.attr_ = function(name) {
- return this.dygraph_.attr_(name);
-};
-
-DygraphLayout.prototype.addDataset = function(setname, set_xy) {
- this.datasets[setname] = set_xy;
-};
-
-DygraphLayout.prototype.setAnnotations = function(ann) {
- // The Dygraph object's annotations aren't parsed. We parse them here and
- // save a copy. If there is no parser, then the user must be using raw format.
- this.annotations = [];
- var parse = this.attr_('xValueParser') || function(x) { return x; };
- for (var i = 0; i < ann.length; i++) {
- var a = {};
- if (!ann[i].xval && !ann[i].x) {
- this.dygraph_.error("Annotations must have an 'x' property");
- return;
- }
- if (ann[i].icon &&
- !(ann[i].hasOwnProperty('width') &&
- ann[i].hasOwnProperty('height'))) {
- this.dygraph_.error("Must set width and height when setting " +
- "annotation.icon property");
- return;
- }
- Dygraph.update(a, ann[i]);
- if (!a.xval) a.xval = parse(a.x);
- this.annotations.push(a);
- }
-};
-
-DygraphLayout.prototype.setXTicks = function(xTicks) {
- this.xTicks_ = xTicks;
-};
-
-// TODO(danvk): add this to the Dygraph object's API or move it into Layout.
-DygraphLayout.prototype.setYAxes = function (yAxes) {
- this.yAxes_ = yAxes;
-};
-
-DygraphLayout.prototype.setDateWindow = function(dateWindow) {
- this.dateWindow_ = dateWindow;
-};
-
-DygraphLayout.prototype.evaluate = function() {
- this._evaluateLimits();
- this._evaluateLineCharts();
- this._evaluateLineTicks();
- this._evaluateAnnotations();
-};
-
-DygraphLayout.prototype._evaluateLimits = function() {
- this.minxval = this.maxxval = null;
- if (this.dateWindow_) {
- this.minxval = this.dateWindow_[0];
- this.maxxval = this.dateWindow_[1];
- } else {
- for (var name in this.datasets) {
- if (!this.datasets.hasOwnProperty(name)) continue;
- var series = this.datasets[name];
- if (series.length > 1) {
- var x1 = series[0][0];
- if (!this.minxval || x1 < this.minxval) this.minxval = x1;
-
- var x2 = series[series.length - 1][0];
- if (!this.maxxval || x2 > this.maxxval) this.maxxval = x2;
- }
- }
- }
- this.xrange = this.maxxval - this.minxval;
- this.xscale = (this.xrange != 0 ? 1/this.xrange : 1.0);
-
- for (var i = 0; i < this.yAxes_.length; i++) {
- var axis = this.yAxes_[i];
- axis.minyval = axis.computedValueRange[0];
- axis.maxyval = axis.computedValueRange[1];
- axis.yrange = axis.maxyval - axis.minyval;
- axis.yscale = (axis.yrange != 0 ? 1.0 / axis.yrange : 1.0);
-
- if (axis.g.attr_("logscale")) {
- axis.ylogrange = Dygraph.log10(axis.maxyval) - Dygraph.log10(axis.minyval);
- axis.ylogscale = (axis.ylogrange != 0 ? 1.0 / axis.ylogrange : 1.0);
- if (!isFinite(axis.ylogrange) || isNaN(axis.ylogrange)) {
- axis.g.error('axis ' + i + ' of graph at ' + axis.g +
- ' can\'t be displayed in log scale for range [' +
- axis.minyval + ' - ' + axis.maxyval + ']');
- }
- }
- }
-};
-
-DygraphLayout.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.dygraph_.axisPropertiesForSeries(setName);
-
- for (var j = 0; j < dataset.length; j++) {
- var item = dataset[j];
-
- var yval;
- if (axis.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.xTicks_.length; i++) {
- var tick = this.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.yAxes_.length; i++ ) {
- var axis = this.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