73 lines
1.9 KiB
JavaScript
Executable file
73 lines
1.9 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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// Base class for all dataset controllers (line, bar, etc)
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Chart.DatasetController = function(chart, datasetIndex) {
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this.initialize.call(this, chart, datasetIndex);
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};
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helpers.extend(Chart.DatasetController.prototype, {
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initialize: function(chart, datasetIndex) {
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this.chart = chart;
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this.index = datasetIndex;
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this.linkScales();
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this.addElements();
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},
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updateIndex: function(datasetIndex) {
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this.index = datasetIndex;
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},
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linkScales: function() {
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if (!this.getDataset().xAxisID) {
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this.getDataset().xAxisID = this.chart.options.scales.xAxes[0].id;
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}
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if (!this.getDataset().yAxisID) {
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this.getDataset().yAxisID = this.chart.options.scales.yAxes[0].id;
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}
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},
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getDataset: function() {
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return this.chart.data.datasets[this.index];
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},
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getScaleForId: function(scaleID) {
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return this.chart.scales[scaleID];
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},
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reset: function() {
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this.update(true);
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},
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buildOrUpdateElements: function buildOrUpdateElements() {
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// Handle the number of data points changing
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var numData = this.getDataset().data.length;
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var numMetaData = this.getDataset().metaData.length;
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// Make sure that we handle number of datapoints changing
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if (numData < numMetaData) {
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// Remove excess bars for data points that have been removed
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this.getDataset().metaData.splice(numData, numMetaData - numData);
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} else if (numData > numMetaData) {
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// Add new elements
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for (var index = numMetaData; index < numData; ++index) {
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this.addElementAndReset(index);
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}
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}
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},
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// Controllers should implement the following
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addElements: helpers.noop,
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addElementAndReset: helpers.noop,
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draw: helpers.noop,
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removeHoverStyle: helpers.noop,
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setHoverStyle: helpers.noop,
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update: helpers.noop
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});
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Chart.DatasetController.extend = helpers.inherits;
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}; |