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-/**
- * @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.
- *
- * 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;
-};
-
-DygraphLayout.prototype.attr_ = function(name) {
- return this.dygraph_.attr_(name);
-};
-
-/**
- * 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.attr_('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.attr_('xValueParser') || function(x) { return x; };
- for (var i = 0; i < ann.length; i++) {
- var a = {};
- if (!ann[i].xval && ann[i].x === undefined) {
- 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.evaluate = function() {
- this._evaluateLimits();
- this._evaluateLineCharts();
- this._evaluateLineTicks();
- this._evaluateAnnotations();
-};
-
-DygraphLayout.prototype._evaluateLimits = function() {
- var xlimits = this.dygraph_.xAxisRange();
- this.minxval = xlimits[0];
- this.maxxval = xlimits[1];
- var xrange = xlimits[1] - xlimits[0];
- this.xscale = (xrange !== 0 ? 1 / 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._calcYNormal = function(axis, value, logscale) {
- if (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() {
- var connectSeparated = this.attr_('connectSeparatedPoints');
- var isStacked = this.attr_("stackedGraph");
- var hasBars = this.attr_('errorBars') || this.attr_('customBars');
-
- for (var setIdx = 0; setIdx < this.points.length; setIdx++) {
- var points = this.points[setIdx];
- var setName = this.setNames[setIdx];
- 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 = (point.xval - this.minxval) * this.xscale;
- // 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);
-
- if (hasBars) {
- point.y_top = DygraphLayout._calcYNormal(
- axis, yval - point.yval_minus, logscale);
- point.y_bottom = DygraphLayout._calcYNormal(
- axis, yval + point.yval_plus, logscale);
- }
- }
- }
-};
-
-/**
- * Optimized replacement for parseFloat, which was way too slow when almost
- * all values were type number, with few edge cases, none of which were strings.
- */
-DygraphLayout.parseFloat_ = function(val) {
- // parseFloat(null) is NaN
- if (val === null) {
- return NaN;
- }
-
- // Assume it's a number or NaN. If it's something else, I'll be shocked.
- return val;
-};
-
-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.xscale * (tick.v - this.minxval);
- 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 = [];
-};