--- /dev/null
+/**
+ * @license
+ * Copyright 2011 Dan Vanderkam (danvdk@gmail.com)
+ * MIT-licensed (http://opensource.org/licenses/MIT)
+ */
+
+/**
+ * @fileoverview Based on PlotKitLayout, but modified to meet the needs of
+ * dygraphs.
+ */
+
+var DygraphLayout = (function() {
+
+/*global Dygraph:false */
+"use strict";
+
+/**
+ * Creates a new DygraphLayout object.
+ *
+ * This class 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.
+ *
+ * @constructor
+ */
+var DygraphLayout = function(dygraph) {
+ this.dygraph_ = dygraph;
+ /**
+ * Array of points for each series.
+ *
+ * [series index][row index in series] = |Point| structure,
+ * where series index refers to visible series only, and the
+ * point index is for the reduced set of points for the current
+ * zoom region (including one point just outside the window).
+ * All points in the same row index share the same X value.
+ *
+ * @type {Array.<Array.<Dygraph.PointType>>}
+ */
+ this.points = [];
+ this.setNames = [];
+ this.annotations = [];
+ 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;
+};
+
+/**
+ * Add points for a single series.
+ *
+ * @param {string} setname Name of the series.
+ * @param {Array.<Dygraph.PointType>} set_xy Points for the series.
+ */
+DygraphLayout.prototype.addDataset = function(setname, set_xy) {
+ this.points.push(set_xy);
+ this.setNames.push(setname);
+};
+
+/**
+ * Returns the box which the chart should be drawn in. This is the canvas's
+ * box, less space needed for the axis and chart labels.
+ *
+ * @return {{x: number, y: number, w: number, h: number}}
+ */
+DygraphLayout.prototype.getPlotArea = function() {
+ return this.area_;
+};
+
+// Compute the box which the chart should be drawn in. This is the canvas's
+// box, less space needed for axis, chart labels, and other plug-ins.
+// NOTE: This should only be called by Dygraph.predraw_().
+DygraphLayout.prototype.computePlotArea = function() {
+ var area = {
+ // TODO(danvk): per-axis setting.
+ x: 0,
+ y: 0
+ };
+
+ area.w = this.dygraph_.width_ - area.x - this.dygraph_.getOption('rightGap');
+ area.h = this.dygraph_.height_;
+
+ // Let plugins reserve space.
+ var e = {
+ chart_div: this.dygraph_.graphDiv,
+ reserveSpaceLeft: function(px) {
+ var r = {
+ x: area.x,
+ y: area.y,
+ w: px,
+ h: area.h
+ };
+ area.x += px;
+ area.w -= px;
+ return r;
+ },
+ reserveSpaceRight: function(px) {
+ var r = {
+ x: area.x + area.w - px,
+ y: area.y,
+ w: px,
+ h: area.h
+ };
+ area.w -= px;
+ return r;
+ },
+ reserveSpaceTop: function(px) {
+ var r = {
+ x: area.x,
+ y: area.y,
+ w: area.w,
+ h: px
+ };
+ area.y += px;
+ area.h -= px;
+ return r;
+ },
+ reserveSpaceBottom: function(px) {
+ var r = {
+ x: area.x,
+ y: area.y + area.h - px,
+ w: area.w,
+ h: px
+ };
+ area.h -= px;
+ return r;
+ },
+ chartRect: function() {
+ return {x:area.x, y:area.y, w:area.w, h:area.h};
+ }
+ };
+ this.dygraph_.cascadeEvents_('layout', e);
+
+ this.area_ = area;
+};
+
+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.dygraph_.getOption('xValueParser') || function(x) { return x; };
+ for (var i = 0; i < ann.length; i++) {
+ var a = {};
+ if (!ann[i].xval && ann[i].x === undefined) {
+ console.error("Annotations must have an 'x' property");
+ return;
+ }
+ if (ann[i].icon &&
+ !(ann[i].hasOwnProperty('width') &&
+ ann[i].hasOwnProperty('height'))) {
+ console.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.evaluate = function() {
+ this._xAxis = {};
+ this._evaluateLimits();
+ this._evaluateLineCharts();
+ this._evaluateLineTicks();
+ this._evaluateAnnotations();
+};
+
+DygraphLayout.prototype._evaluateLimits = function() {
+ var xlimits = this.dygraph_.xAxisRange();
+ this._xAxis.minval = xlimits[0];
+ this._xAxis.maxval = xlimits[1];
+ var xrange = xlimits[1] - xlimits[0];
+ this._xAxis.scale = (xrange !== 0 ? 1 / xrange : 1.0);
+
+ if (this.dygraph_.getOptionForAxis("logscale", 'x')) {
+ this._xAxis.xlogrange = Dygraph.log10(this._xAxis.maxval) - Dygraph.log10(this._xAxis.minval);
+ this._xAxis.xlogscale = (this._xAxis.xlogrange !== 0 ? 1.0 / this._xAxis.xlogrange : 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 (this.dygraph_.getOption("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)) {
+ console.error('axis ' + i + ' of graph at ' + axis.g +
+ ' can\'t be displayed in log scale for range [' +
+ axis.minyval + ' - ' + axis.maxyval + ']');
+ }
+ }
+ }
+};
+
+DygraphLayout.calcXNormal_ = function(value, xAxis, logscale) {
+ if (logscale) {
+ return ((Dygraph.log10(value) - Dygraph.log10(xAxis.minval)) * xAxis.xlogscale);
+ } else {
+ return (value - xAxis.minval) * xAxis.scale;
+ }
+};
+
+/**
+ * @param {DygraphAxisType} axis
+ * @param {number} value
+ * @param {boolean} logscale
+ * @return {number}
+ */
+DygraphLayout.calcYNormal_ = function(axis, value, logscale) {
+ if (logscale) {
+ var x = 1.0 - ((Dygraph.log10(value) - Dygraph.log10(axis.minyval)) * axis.ylogscale);
+ return isFinite(x) ? x : NaN; // shim for v8 issue; see pull request 276
+ } else {
+ return 1.0 - ((value - axis.minyval) * axis.yscale);
+ }
+};
+
+DygraphLayout.prototype._evaluateLineCharts = function() {
+ var isStacked = this.dygraph_.getOption("stackedGraph");
+ var isLogscaleForX = this.dygraph_.getOptionForAxis("logscale", 'x');
+
+ for (var setIdx = 0; setIdx < this.points.length; setIdx++) {
+ var points = this.points[setIdx];
+ var setName = this.setNames[setIdx];
+ var connectSeparated = this.dygraph_.getOption('connectSeparatedPoints', setName);
+ var axis = this.dygraph_.axisPropertiesForSeries(setName);
+ // TODO (konigsberg): use optionsForAxis instead.
+ var logscale = this.dygraph_.attributes_.getForSeries("logscale", setName);
+
+ for (var j = 0; j < points.length; j++) {
+ var point = points[j];
+
+ // Range from 0-1 where 0 represents left and 1 represents right.
+ point.x = DygraphLayout.calcXNormal_(point.xval, this._xAxis, isLogscaleForX);
+ // Range from 0-1 where 0 represents top and 1 represents bottom
+ var yval = point.yval;
+ if (isStacked) {
+ point.y_stacked = DygraphLayout.calcYNormal_(
+ axis, point.yval_stacked, logscale);
+ if (yval !== null && !isNaN(yval)) {
+ yval = point.yval_stacked;
+ }
+ }
+ if (yval === null) {
+ yval = NaN;
+ if (!connectSeparated) {
+ point.yval = NaN;
+ }
+ }
+ point.y = DygraphLayout.calcYNormal_(axis, yval, logscale);
+ }
+
+ this.dygraph_.dataHandler_.onLineEvaluated(points, axis, logscale);
+ }
+};
+
+DygraphLayout.prototype._evaluateLineTicks = function() {
+ var i, tick, label, pos;
+ this.xticks = [];
+ for (i = 0; i < this.xTicks_.length; i++) {
+ tick = this.xTicks_[i];
+ label = tick.label;
+ pos = this.dygraph_.toPercentXCoord(tick.v);
+ if ((pos >= 0.0) && (pos < 1.0)) {
+ this.xticks.push([pos, label]);
+ }
+ }
+
+ this.yticks = [];
+ for (i = 0; i < this.yAxes_.length; i++ ) {
+ var axis = this.yAxes_[i];
+ for (var j = 0; j < axis.ticks.length; j++) {
+ tick = axis.ticks[j];
+ label = tick.label;
+ pos = this.dygraph_.toPercentYCoord(tick.v, i);
+ if ((pos > 0.0) && (pos <= 1.0)) {
+ this.yticks.push([i, pos, label]);
+ }
+ }
+ }
+};
+
+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 i;
+ var annotations = {};
+ for (i = 0; i < this.annotations.length; i++) {
+ var a = this.annotations[i];
+ annotations[a.xval + "," + a.series] = a;
+ }
+
+ this.annotated_points = [];
+
+ // Exit the function early if there are no annotations.
+ if (!this.annotations || !this.annotations.length) {
+ return;
+ }
+
+ // TODO(antrob): loop through annotations not points.
+ for (var setIdx = 0; setIdx < this.points.length; setIdx++) {
+ var points = this.points[setIdx];
+ for (i = 0; i < points.length; i++) {
+ var p = 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
+ */
+DygraphLayout.prototype.removeAllDatasets = function() {
+ delete this.points;
+ delete this.setNames;
+ delete this.setPointsLengths;
+ delete this.setPointsOffsets;
+ this.points = [];
+ this.setNames = [];
+ this.setPointsLengths = [];
+ this.setPointsOffsets = [];
+};
+
+return DygraphLayout;
+
+})();
projects / dygraphs.git / blobdiff