561 lines
16 KiB
JavaScript
Executable file
561 lines
16 KiB
JavaScript
Executable file
"use strict";
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module.exports = function(Chart) {
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var helpers = Chart.helpers;
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//Create a dictionary of chart types, to allow for extension of existing types
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Chart.types = {};
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//Store a reference to each instance - allowing us to globally resize chart instances on window resize.
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//Destroy method on the chart will remove the instance of the chart from this reference.
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Chart.instances = {};
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// Controllers available for dataset visualization eg. bar, line, slice, etc.
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Chart.controllers = {};
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// The main controller of a chart
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Chart.Controller = function(instance) {
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this.chart = instance;
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this.config = instance.config;
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this.options = this.config.options = helpers.configMerge(Chart.defaults.global, Chart.defaults[this.config.type], this.config.options || {});
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this.id = helpers.uid();
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Object.defineProperty(this, 'data', {
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get: function() {
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return this.config.data;
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}
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});
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//Add the chart instance to the global namespace
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Chart.instances[this.id] = this;
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if (this.options.responsive) {
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// Silent resize before chart draws
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this.resize(true);
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}
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this.initialize();
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return this;
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};
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helpers.extend(Chart.Controller.prototype, {
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initialize: function initialize() {
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// TODO
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// If BeforeInit(this) doesn't return false, proceed
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this.bindEvents();
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// Make sure controllers are built first so that each dataset is bound to an axis before the scales
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// are built
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this.ensureScalesHaveIDs();
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this.buildOrUpdateControllers();
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this.buildScales();
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this.buildSurroundingItems();
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this.updateLayout();
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this.resetElements();
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this.initToolTip();
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this.draw();
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this.update();
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// TODO
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// If AfterInit(this) doesn't return false, proceed
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return this;
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},
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clear: function clear() {
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helpers.clear(this.chart);
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return this;
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},
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stop: function stop() {
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// Stops any current animation loop occuring
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Chart.animationService.cancelAnimation(this);
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return this;
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},
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resize: function resize(silent) {
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var canvas = this.chart.canvas;
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var newWidth = helpers.getMaximumWidth(this.chart.canvas);
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var newHeight = (this.options.maintainAspectRatio && isNaN(this.chart.aspectRatio) === false && isFinite(this.chart.aspectRatio) && this.chart.aspectRatio !== 0) ? newWidth / this.chart.aspectRatio : helpers.getMaximumHeight(this.chart.canvas);
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var sizeChanged = this.chart.width !== newWidth || this.chart.height !== newHeight;
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if (!sizeChanged)
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return this;
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canvas.width = this.chart.width = newWidth;
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canvas.height = this.chart.height = newHeight;
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helpers.retinaScale(this.chart);
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if (!silent) {
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this.stop();
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this.update(this.options.responsiveAnimationDuration);
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}
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return this;
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},
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ensureScalesHaveIDs: function ensureScalesHaveIDs() {
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var defaultXAxisID = 'x-axis-';
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var defaultYAxisID = 'y-axis-';
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if (this.options.scales) {
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if (this.options.scales.xAxes && this.options.scales.xAxes.length) {
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helpers.each(this.options.scales.xAxes, function(xAxisOptions, index) {
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xAxisOptions.id = xAxisOptions.id || (defaultXAxisID + index);
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});
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}
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if (this.options.scales.yAxes && this.options.scales.yAxes.length) {
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// Build the y axes
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helpers.each(this.options.scales.yAxes, function(yAxisOptions, index) {
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yAxisOptions.id = yAxisOptions.id || (defaultYAxisID + index);
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});
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}
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}
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},
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buildScales: function buildScales() {
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// Map of scale ID to scale object so we can lookup later
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this.scales = {};
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// Build the x axes
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if (this.options.scales) {
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if (this.options.scales.xAxes && this.options.scales.xAxes.length) {
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helpers.each(this.options.scales.xAxes, function(xAxisOptions, index) {
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var ScaleClass = Chart.scaleService.getScaleConstructor(xAxisOptions.type);
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if (ScaleClass) {
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var scale = new ScaleClass({
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ctx: this.chart.ctx,
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options: xAxisOptions,
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chart: this,
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id: xAxisOptions.id
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});
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this.scales[scale.id] = scale;
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}
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}, this);
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}
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if (this.options.scales.yAxes && this.options.scales.yAxes.length) {
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// Build the y axes
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helpers.each(this.options.scales.yAxes, function(yAxisOptions, index) {
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var ScaleClass = Chart.scaleService.getScaleConstructor(yAxisOptions.type);
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if (ScaleClass) {
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var scale = new ScaleClass({
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ctx: this.chart.ctx,
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options: yAxisOptions,
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chart: this,
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id: yAxisOptions.id
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});
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this.scales[scale.id] = scale;
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}
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}, this);
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}
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}
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if (this.options.scale) {
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// Build radial axes
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var ScaleClass = Chart.scaleService.getScaleConstructor(this.options.scale.type);
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if (ScaleClass) {
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var scale = new ScaleClass({
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ctx: this.chart.ctx,
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options: this.options.scale,
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chart: this
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});
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this.scale = scale;
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this.scales.radialScale = scale;
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}
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}
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Chart.scaleService.addScalesToLayout(this);
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},
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buildSurroundingItems: function() {
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if (this.options.title) {
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this.titleBlock = new Chart.Title({
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ctx: this.chart.ctx,
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options: this.options.title,
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chart: this
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});
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Chart.layoutService.addBox(this, this.titleBlock);
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}
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if (this.options.legend) {
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this.legend = new Chart.Legend({
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ctx: this.chart.ctx,
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options: this.options.legend,
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chart: this
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});
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Chart.layoutService.addBox(this, this.legend);
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}
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},
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updateLayout: function() {
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Chart.layoutService.update(this, this.chart.width, this.chart.height);
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},
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buildOrUpdateControllers: function buildOrUpdateControllers() {
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var types = [];
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var newControllers = [];
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helpers.each(this.data.datasets, function(dataset, datasetIndex) {
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if (!dataset.type) {
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dataset.type = this.config.type;
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}
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var type = dataset.type;
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types.push(type);
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if (dataset.controller) {
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dataset.controller.updateIndex(datasetIndex);
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} else {
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dataset.controller = new Chart.controllers[type](this, datasetIndex);
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newControllers.push(dataset.controller);
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}
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}, this);
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if (types.length > 1) {
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for (var i = 1; i < types.length; i++) {
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if (types[i] !== types[i - 1]) {
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this.isCombo = true;
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break;
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}
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}
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}
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return newControllers;
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},
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resetElements: function resetElements() {
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helpers.each(this.data.datasets, function(dataset, datasetIndex) {
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dataset.controller.reset();
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});
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},
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update: function update(animationDuration, lazy) {
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// In case the entire data object changed
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this.tooltip._data = this.data;
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// Make sure dataset controllers are updated and new controllers are reset
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var newControllers = this.buildOrUpdateControllers();
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Chart.layoutService.update(this, this.chart.width, this.chart.height);
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// Can only reset the new controllers after the scales have been updated
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helpers.each(newControllers, function(controller) {
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controller.reset();
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});
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// Make sure all dataset controllers have correct meta data counts
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helpers.each(this.data.datasets, function(dataset, datasetIndex) {
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dataset.controller.buildOrUpdateElements();
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});
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// This will loop through any data and do the appropriate element update for the type
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helpers.each(this.data.datasets, function(dataset, datasetIndex) {
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dataset.controller.update();
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});
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this.render(animationDuration, lazy);
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},
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render: function render(duration, lazy) {
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if (this.options.animation && ((typeof duration !== 'undefined' && duration !== 0) || (typeof duration === 'undefined' && this.options.animation.duration !== 0))) {
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var animation = new Chart.Animation();
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animation.numSteps = (duration || this.options.animation.duration) / 16.66; //60 fps
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animation.easing = this.options.animation.easing;
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// render function
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animation.render = function(chartInstance, animationObject) {
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var easingFunction = helpers.easingEffects[animationObject.easing];
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var stepDecimal = animationObject.currentStep / animationObject.numSteps;
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var easeDecimal = easingFunction(stepDecimal);
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chartInstance.draw(easeDecimal, stepDecimal, animationObject.currentStep);
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};
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// user events
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animation.onAnimationProgress = this.options.animation.onProgress;
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animation.onAnimationComplete = this.options.animation.onComplete;
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Chart.animationService.addAnimation(this, animation, duration, lazy);
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} else {
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this.draw();
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if (this.options.animation && this.options.animation.onComplete && this.options.animation.onComplete.call) {
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this.options.animation.onComplete.call(this);
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}
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}
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return this;
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},
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draw: function(ease) {
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var easingDecimal = ease || 1;
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this.clear();
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// Draw all the scales
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helpers.each(this.boxes, function(box) {
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box.draw(this.chartArea);
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}, this);
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if (this.scale) {
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this.scale.draw();
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}
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// Draw each dataset via its respective controller (reversed to support proper line stacking)
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helpers.each(this.data.datasets, function(dataset, datasetIndex) {
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if (helpers.isDatasetVisible(dataset)) {
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dataset.controller.draw(ease);
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}
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}, null, true);
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// Finally draw the tooltip
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this.tooltip.transition(easingDecimal).draw();
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},
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// Get the single element that was clicked on
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// @return : An object containing the dataset index and element index of the matching element. Also contains the rectangle that was draw
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getElementAtEvent: function(e) {
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var eventPosition = helpers.getRelativePosition(e, this.chart);
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var elementsArray = [];
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helpers.each(this.data.datasets, function(dataset, datasetIndex) {
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if (helpers.isDatasetVisible(dataset)) {
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helpers.each(dataset.metaData, function(element, index) {
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if (element.inRange(eventPosition.x, eventPosition.y)) {
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elementsArray.push(element);
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return elementsArray;
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}
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});
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}
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});
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return elementsArray;
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},
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getElementsAtEvent: function(e) {
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var eventPosition = helpers.getRelativePosition(e, this.chart);
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var elementsArray = [];
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var found = (function() {
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for (var i = 0; i < this.data.datasets.length; i++) {
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if (helpers.isDatasetVisible(this.data.datasets[i])) {
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for (var j = 0; j < this.data.datasets[i].metaData.length; j++) {
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if (this.data.datasets[i].metaData[j].inRange(eventPosition.x, eventPosition.y)) {
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return this.data.datasets[i].metaData[j];
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}
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}
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}
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}
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}).call(this);
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if (!found) {
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return elementsArray;
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}
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helpers.each(this.data.datasets, function(dataset, dsIndex) {
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if (helpers.isDatasetVisible(dataset)) {
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elementsArray.push(dataset.metaData[found._index]);
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}
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});
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return elementsArray;
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},
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getDatasetAtEvent: function(e) {
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var elementsArray = this.getElementAtEvent(e);
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if (elementsArray.length > 0) {
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elementsArray = this.data.datasets[elementsArray[0]._datasetIndex].metaData;
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}
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return elementsArray;
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},
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generateLegend: function generateLegend() {
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return this.options.legendCallback(this);
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},
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destroy: function destroy() {
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this.clear();
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helpers.unbindEvents(this, this.events);
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helpers.removeResizeListener(this.chart.canvas.parentNode);
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// Reset canvas height/width attributes
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var canvas = this.chart.canvas;
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canvas.width = this.chart.width;
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canvas.height = this.chart.height;
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// if we scaled the canvas in response to a devicePixelRatio !== 1, we need to undo that transform here
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if (this.chart.originalDevicePixelRatio !== undefined) {
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this.chart.ctx.scale(1 / this.chart.originalDevicePixelRatio, 1 / this.chart.originalDevicePixelRatio);
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}
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// Reset to the old style since it may have been changed by the device pixel ratio changes
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canvas.style.width = this.chart.originalCanvasStyleWidth;
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canvas.style.height = this.chart.originalCanvasStyleHeight;
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delete Chart.instances[this.id];
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},
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toBase64Image: function toBase64Image() {
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return this.chart.canvas.toDataURL.apply(this.chart.canvas, arguments);
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},
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initToolTip: function initToolTip() {
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this.tooltip = new Chart.Tooltip({
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_chart: this.chart,
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_chartInstance: this,
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_data: this.data,
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_options: this.options
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}, this);
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},
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bindEvents: function bindEvents() {
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helpers.bindEvents(this, this.options.events, function(evt) {
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this.eventHandler(evt);
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});
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},
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eventHandler: function eventHandler(e) {
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this.lastActive = this.lastActive || [];
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this.lastTooltipActive = this.lastTooltipActive || [];
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// Find Active Elements for hover and tooltips
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if (e.type === 'mouseout') {
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this.active = [];
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this.tooltipActive = [];
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} else {
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var _this = this;
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var getItemsForMode = function(mode) {
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switch (mode) {
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case 'single':
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return _this.getElementAtEvent(e);
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case 'label':
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return _this.getElementsAtEvent(e);
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case 'dataset':
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return _this.getDatasetAtEvent(e);
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default:
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return e;
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}
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};
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this.active = getItemsForMode(this.options.hover.mode);
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this.tooltipActive = getItemsForMode(this.options.tooltips.mode);
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}
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// On Hover hook
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if (this.options.hover.onHover) {
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this.options.hover.onHover.call(this, this.active);
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}
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if (e.type === 'mouseup' || e.type === 'click') {
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if (this.options.onClick) {
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this.options.onClick.call(this, e, this.active);
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}
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if (this.legend && this.legend.handleEvent) {
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this.legend.handleEvent(e);
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}
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}
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var dataset;
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var index;
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// Remove styling for last active (even if it may still be active)
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if (this.lastActive.length) {
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switch (this.options.hover.mode) {
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case 'single':
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this.data.datasets[this.lastActive[0]._datasetIndex].controller.removeHoverStyle(this.lastActive[0], this.lastActive[0]._datasetIndex, this.lastActive[0]._index);
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break;
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case 'label':
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case 'dataset':
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for (var i = 0; i < this.lastActive.length; i++) {
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if (this.lastActive[i])
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this.data.datasets[this.lastActive[i]._datasetIndex].controller.removeHoverStyle(this.lastActive[i], this.lastActive[i]._datasetIndex, this.lastActive[i]._index);
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}
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break;
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default:
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// Don't change anything
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}
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}
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// Built in hover styling
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if (this.active.length && this.options.hover.mode) {
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switch (this.options.hover.mode) {
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case 'single':
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this.data.datasets[this.active[0]._datasetIndex].controller.setHoverStyle(this.active[0]);
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break;
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case 'label':
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case 'dataset':
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for (var j = 0; j < this.active.length; j++) {
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if (this.active[j])
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this.data.datasets[this.active[j]._datasetIndex].controller.setHoverStyle(this.active[j]);
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}
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break;
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default:
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// Don't change anything
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}
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}
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// Built in Tooltips
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if (this.options.tooltips.enabled || this.options.tooltips.custom) {
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// The usual updates
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this.tooltip.initialize();
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this.tooltip._active = this.tooltipActive;
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this.tooltip.update();
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}
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// Hover animations
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this.tooltip.pivot();
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if (!this.animating) {
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var changed;
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helpers.each(this.active, function(element, index) {
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if (element !== this.lastActive[index]) {
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changed = true;
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}
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}, this);
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helpers.each(this.tooltipActive, function(element, index) {
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if (element !== this.lastTooltipActive[index]) {
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changed = true;
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}
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}, this);
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// If entering, leaving, or changing elements, animate the change via pivot
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if ((this.lastActive.length !== this.active.length) ||
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(this.lastTooltipActive.length !== this.tooltipActive.length) ||
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changed) {
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this.stop();
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if (this.options.tooltips.enabled || this.options.tooltips.custom) {
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this.tooltip.update(true);
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}
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// We only need to render at this point. Updating will cause scales to be recomputed generating flicker & using more
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// memory than necessary.
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this.render(this.options.hover.animationDuration, true);
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}
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}
|
|
|
|
// Remember Last Actives
|
|
this.lastActive = this.active;
|
|
this.lastTooltipActive = this.tooltipActive;
|
|
return this;
|
|
}
|
|
});
|
|
};
|