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Bubble Chart Type and Bubble Controller
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Tanner Linsley
218
src/controllers/controller.bubble.js
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218
src/controllers/controller.bubble.js
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(function() {
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"use strict";
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var root = this,
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Chart = root.Chart,
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helpers = Chart.helpers;
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Chart.defaults.bubble = {
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hover: {
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mode: "single"
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},
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scales: {
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xAxes: [{
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type: "linear", // bubble should probably use a linear scale by default
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position: "bottom",
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id: "x-axis-0", // need an ID so datasets can reference the scale
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}],
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yAxes: [{
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type: "linear",
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position: "left",
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id: "y-axis-0",
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}],
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},
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tooltips: {
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template: "(<%= value.x %>, <%= value.y %>, <%= value.r %>)",
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multiTemplate: "<%if (datasetLabel){%><%=datasetLabel%>: <%}%>(<%= value.x %>, <%= value.y %>, <%= value.r %>)",
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},
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};
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Chart.controllers.bubble = function(chart, datasetIndex) {
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this.initialize.call(this, chart, datasetIndex);
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};
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helpers.extend(Chart.controllers.bubble.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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addElements: function() {
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this.getDataset().metaData = this.getDataset().metaData || [];
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helpers.each(this.getDataset().data, function(value, index) {
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this.getDataset().metaData[index] = this.getDataset().metaData[index] || new Chart.elements.Point({
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_chart: this.chart.chart,
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_datasetIndex: this.index,
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_index: index,
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});
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}, this);
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},
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addElementAndReset: function(index) {
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this.getDataset().metaData = this.getDataset().metaData || [];
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var point = new Chart.elements.Point({
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_chart: this.chart.chart,
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_datasetIndex: this.index,
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_index: index,
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});
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// Reset the point
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this.updateElement(point, index, true);
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// Add to the points array
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this.getDataset().metaData.splice(index, 0, point);
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},
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removeElement: function(index) {
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this.getDataset().metaData.splice(index, 1);
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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 numPoints = this.getDataset().metaData.length;
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// Make sure that we handle number of datapoints changing
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if (numData < numPoints) {
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// Remove excess bars for data points that have been removed
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this.getDataset().metaData.splice(numData, numPoints - numData);
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} else if (numData > numPoints) {
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// Add new elements
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for (var index = numPoints; 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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update: function update(reset) {
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var points = this.getDataset().metaData;
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var yScale = this.getScaleForId(this.getDataset().yAxisID);
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var xScale = this.getScaleForId(this.getDataset().xAxisID);
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var scaleBase;
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if (yScale.min < 0 && yScale.max < 0) {
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scaleBase = yScale.getPixelForValue(yScale.max);
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} else if (yScale.min > 0 && yScale.max > 0) {
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scaleBase = yScale.getPixelForValue(yScale.min);
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} else {
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scaleBase = yScale.getPixelForValue(0);
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}
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// Update Points
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helpers.each(points, function(point, index) {
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this.updateElement(point, index, reset);
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}, this);
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},
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updateElement: function(point, index, reset) {
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var yScale = this.getScaleForId(this.getDataset().yAxisID);
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var xScale = this.getScaleForId(this.getDataset().xAxisID);
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var scaleBase;
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if (yScale.min < 0 && yScale.max < 0) {
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scaleBase = yScale.getPixelForValue(yScale.max);
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} else if (yScale.min > 0 && yScale.max > 0) {
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scaleBase = yScale.getPixelForValue(yScale.min);
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} else {
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scaleBase = yScale.getPixelForValue(0);
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}
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helpers.extend(point, {
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// Utility
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_chart: this.chart.chart,
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_xScale: xScale,
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_yScale: yScale,
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_datasetIndex: this.index,
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_index: index,
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// Desired view properties
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_model: {
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x: reset ? xScale.getPixelForDecimal(0.5) : xScale.getPixelForValue(this.getDataset().data[index], index, this.index, this.chart.isCombo),
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y: reset ? scaleBase : yScale.getPixelForValue(this.getDataset().data[index], index, this.index),
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// Appearance
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radius: reset ? 0 : point.custom && point.custom.radius ? point.custom.radius : this.getRadius(this.getDataset().data[index]),
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backgroundColor: point.custom && point.custom.backgroundColor ? point.custom.backgroundColor : helpers.getValueAtIndexOrDefault(this.getDataset().backgroundColor, index, this.chart.options.elements.point.backgroundColor),
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borderColor: point.custom && point.custom.borderColor ? point.custom.borderColor : helpers.getValueAtIndexOrDefault(this.getDataset().borderColor, index, this.chart.options.elements.point.borderColor),
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borderWidth: point.custom && point.custom.borderWidth ? point.custom.borderWidth : helpers.getValueAtIndexOrDefault(this.getDataset().borderWidth, index, this.chart.options.elements.point.borderWidth),
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skip: point.custom && point.custom.skip ? point.custom.skip : this.getDataset().data[index] === null,
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// Tooltip
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hitRadius: point.custom && point.custom.hitRadius ? point.custom.hitRadius : helpers.getValueAtIndexOrDefault(this.getDataset().hitRadius, index, this.chart.options.elements.point.hitRadius),
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},
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});
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point.pivot();
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},
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getRadius: function(value) {
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return value.r || this.chart.options.elements.point.radius;
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},
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draw: function(ease) {
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var easingDecimal = ease || 1;
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// Transition and Draw the Points
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helpers.each(this.getDataset().metaData, function(point, index) {
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point.transition(easingDecimal);
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point.draw();
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}, this);
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},
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setHoverStyle: function(point) {
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// Point
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var dataset = this.chart.data.datasets[point._datasetIndex];
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var index = point._index;
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point._model.radius = point.custom && point.custom.hoverRadius ? point.custom.hoverRadius : (helpers.getValueAtIndexOrDefault(dataset.hoverRadius, index, this.chart.options.elements.point.hoverRadius)) + this.getRadius(this.getDataset().data[point._index]);
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point._model.backgroundColor = point.custom && point.custom.hoverBackgroundColor ? point.custom.hoverBackgroundColor : helpers.getValueAtIndexOrDefault(dataset.hoverBackgroundColor, index, helpers.color(point._model.backgroundColor).saturate(0.5).darken(0.1).rgbString());
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point._model.borderColor = point.custom && point.custom.hoverBorderColor ? point.custom.hoverBorderColor : helpers.getValueAtIndexOrDefault(dataset.hoverBorderColor, index, helpers.color(point._model.borderColor).saturate(0.5).darken(0.1).rgbString());
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point._model.borderWidth = point.custom && point.custom.hoverBorderWidth ? point.custom.hoverBorderWidth : helpers.getValueAtIndexOrDefault(dataset.hoverBorderWidth, index, point._model.borderWidth);
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},
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removeHoverStyle: function(point) {
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var dataset = this.chart.data.datasets[point._datasetIndex];
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var index = point._index;
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point._model.radius = point.custom && point.custom.radius ? point.custom.radius : this.getRadius(this.getDataset().data[point._index]);
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point._model.backgroundColor = point.custom && point.custom.backgroundColor ? point.custom.backgroundColor : helpers.getValueAtIndexOrDefault(this.getDataset().backgroundColor, index, this.chart.options.elements.point.backgroundColor);
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point._model.borderColor = point.custom && point.custom.borderColor ? point.custom.borderColor : helpers.getValueAtIndexOrDefault(this.getDataset().borderColor, index, this.chart.options.elements.point.borderColor);
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point._model.borderWidth = point.custom && point.custom.borderWidth ? point.custom.borderWidth : helpers.getValueAtIndexOrDefault(this.getDataset().borderWidth, index, this.chart.options.elements.point.borderWidth);
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}
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});
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}).call(this);
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