-// Copyright 2011 Dan Vanderkam (danvdk@gmail.com)
-// All Rights Reserved.
+/**
+ * @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.
*/
+/*jshint globalstrict: true */
+/*global Dygraph:false */
+"use strict";
+
/**
* Creates a new DygraphLayout object.
*
*
* @constructor
*/
-DygraphLayout = function(dygraph) {
+var DygraphLayout = function(dygraph) {
this.dygraph_ = dygraph;
- this.datasets = new Array();
- this.annotations = new Array();
+ this.datasets = [];
+ this.setNames = [];
+ this.annotations = [];
this.yAxes_ = null;
// TODO(danvk): it's odd that xTicks_ and yTicks_ are inputs, but xticks and
};
DygraphLayout.prototype.addDataset = function(setname, set_xy) {
- this.datasets[setname] = set_xy;
+ this.datasets.push(set_xy);
+ this.setNames.push(setname);
+};
+
+DygraphLayout.prototype.getPlotArea = function() {
+ return this.computePlotArea_();
+};
+
+// Compute the box which the chart should be drawn in. This is the canvas's
+// box, less space needed for axis and chart labels.
+DygraphLayout.prototype.computePlotArea_ = 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.dygraph_.width_ - area.x - this.attr_('rightGap');
+ area.h = this.dygraph_.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.
+ }
+
+ if (this.attr_('y2label')) {
+ // same logic applies here as for ylabel.
+ // TODO(danvk): make yAxisLabelWidth a per-axis property
+ }
+
+ // Add space for range selector, if needed.
+ if (this.attr_('showRangeSelector')) {
+ area.h -= this.attr_('rangeSelectorHeight') + 4;
+ }
+
+ return area;
};
DygraphLayout.prototype.setAnnotations = function(ann) {
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];
+ for (var setIdx = 0; setIdx < this.datasets.length; ++setIdx) {
+ var series = this.datasets[setIdx];
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);
+ 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);
+ 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);
+ 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 [' +
}
};
+DygraphLayout._calcYNormal = function(axis, value) {
+ if (axis.logscale) {
+ return 1.0 - ((Dygraph.log10(value) - Dygraph.log10(axis.minyval)) * axis.ylogscale);
+ } else {
+ return 1.0 - ((value - axis.minyval) * axis.yscale);
+ }
+};
+
DygraphLayout.prototype._evaluateLineCharts = function() {
// add all the rects
- this.points = new Array();
- for (var setName in this.datasets) {
- if (!this.datasets.hasOwnProperty(setName)) continue;
+ this.points = [];
+ // An array to keep track of how many points will be drawn for each set.
+ // This will allow for the canvas renderer to not have to check every point
+ // for every data set since the points are added in order of the sets in
+ // datasets.
+ this.setPointsLengths = [];
+ this.setPointsOffsets = [];
- var dataset = this.datasets[setName];
+ var connectSeparated = this.attr_('connectSeparatedPoints');
+ for (var setIdx = 0; setIdx < this.datasets.length; ++setIdx) {
+ var dataset = this.datasets[setIdx];
+ var setName = this.setNames[setIdx];
var axis = this.dygraph_.axisPropertiesForSeries(setName);
+ this.setPointsOffsets.push(this.points.length);
+ var setPointsLength = 0;
+
for (var j = 0; j < dataset.length; j++) {
var item = dataset[j];
+ var xValue = parseFloat(item[0]);
+ var yValue = parseFloat(item[1]);
+
+ // Range from 0-1 where 0 represents left and 1 represents right.
+ var xNormal = (xValue - this.minxval) * this.xscale;
+ // Range from 0-1 where 0 represents top and 1 represents bottom
+ var yNormal = DygraphLayout._calcYNormal(axis, yValue);
- 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]),
+ x: xNormal,
+ y: yNormal,
+ xval: xValue,
+ yval: yValue,
name: setName
};
-
+ if (connectSeparated && item[1] === null) {
+ point.yval = null;
+ }
this.points.push(point);
+ setPointsLength += 1;
}
+ this.setPointsLengths.push(setPointsLength);
}
};
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);
+ var i, tick, label, pos;
+ this.xticks = [];
+ for (i = 0; i < this.xTicks_.length; i++) {
+ tick = this.xTicks_[i];
+ label = tick.label;
+ 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++ ) {
+ this.yticks = [];
+ for (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);
+ 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]);
}
if (!(this.attr_('errorBars') || this.attr_('customBars'))) 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 i = 0; // index in this.points
+ for (var setIdx = 0; setIdx < this.datasets.length; ++setIdx) {
var j = 0;
- var dataset = this.datasets[setName];
- for (var j = 0; j < dataset.length; j++, i++) {
+ var dataset = this.datasets[setIdx];
+ var setName = this.setNames[setIdx];
+ var axis = this.dygraph_.axisPropertiesForSeries(setName);
+ for (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]);
+ var errorMinus = parseFloat(item[2]);
+ var errorPlus = parseFloat(item[3]);
+
+ var yv_minus = yv - errorMinus;
+ var yv_plus = yv + errorPlus;
+ this.points[i].y_top = DygraphLayout._calcYNormal(axis, yv_minus);
+ this.points[i].y_bottom = DygraphLayout._calcYNormal(axis, yv_plus);
}
}
}
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 (var i = 0; i < this.annotations.length; i++) {
+ for (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++) {
+
+ // Exit the function early if there are no annotations.
+ if (!this.annotations || !this.annotations.length) {
+ return;
+ }
+
+ // TODO(antrob): loop through annotations not points.
+ for (i = 0; i < this.points.length; i++) {
var p = this.points[i];
var k = p.xval + "," + p.name;
if (k in annotations) {
*/
DygraphLayout.prototype.removeAllDatasets = function() {
delete this.datasets;
- this.datasets = new Array();
+ delete this.setNames;
+ delete this.setPointsLengths;
+ delete this.setPointsOffsets;
+ this.datasets = [];
+ this.setNames = [];
+ this.setPointsLengths = [];
+ this.setPointsOffsets = [];
};
/**
*/
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];
+ var unstackedPoint = {};
+ for (var pt in point) {
+ unstackedPoint[pt] = point[pt];
}
-
+
if (!this.attr_("stackedGraph")) {
return unstackedPoint;
}
-
- // The unstacked yval is equal to the current yval minus the yval of the
+
+ // 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;
+ unstackedPoint.yval -= this.points[i].yval;
break;
}
}
-
+
return unstackedPoint;
-}
+};
projects / dygraphs.git / blobdiff