306 lines
10 KiB
JavaScript
Executable File
306 lines
10 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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Chart.defaults.bar = {
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hover: {
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mode: "label"
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},
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scales: {
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xAxes: [{
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type: "category",
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// Specific to Bar Controller
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categoryPercentage: 0.8,
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barPercentage: 0.9,
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// grid line settings
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gridLines: {
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offsetGridLines: true
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}
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}],
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yAxes: [{
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type: "linear"
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}]
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}
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};
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Chart.controllers.bar = Chart.DatasetController.extend({
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initialize: function(chart, datasetIndex) {
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Chart.DatasetController.prototype.initialize.call(this, chart, datasetIndex);
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// Use this to indicate that this is a bar dataset.
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this.getDataset().bar = true;
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},
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// Get the number of datasets that display bars. We use this to correctly calculate the bar width
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getBarCount: function getBarCount() {
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var barCount = 0;
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helpers.each(this.chart.data.datasets, function(dataset) {
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if (helpers.isDatasetVisible(dataset) && dataset.bar) {
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++barCount;
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}
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});
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return barCount;
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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.Rectangle({
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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 rectangle = new Chart.elements.Rectangle({
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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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var numBars = this.getBarCount();
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this.updateElement(rectangle, index, true, numBars);
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this.getDataset().metaData.splice(index, 0, rectangle);
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},
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update: function update(reset) {
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var numBars = this.getBarCount();
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helpers.each(this.getDataset().metaData, function(rectangle, index) {
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this.updateElement(rectangle, index, reset, numBars);
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}, this);
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},
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updateElement: function updateElement(rectangle, index, reset, numBars) {
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var xScale = this.getScaleForId(this.getDataset().xAxisID);
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var yScale = this.getScaleForId(this.getDataset().yAxisID);
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var yScalePoint;
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if (yScale.min < 0 && yScale.max < 0) {
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// all less than 0. use the top
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yScalePoint = yScale.getPixelForValue(yScale.max);
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} else if (yScale.min > 0 && yScale.max > 0) {
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yScalePoint = yScale.getPixelForValue(yScale.min);
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} else {
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yScalePoint = yScale.getPixelForValue(0);
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}
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helpers.extend(rectangle, {
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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: this.calculateBarX(index, this.index),
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y: reset ? yScalePoint : this.calculateBarY(index, this.index),
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// Tooltip
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label: this.chart.data.labels[index],
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datasetLabel: this.getDataset().label,
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// Appearance
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base: this.calculateBarBase(this.index, index),
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width: this.calculateBarWidth(numBars),
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backgroundColor: rectangle.custom && rectangle.custom.backgroundColor ? rectangle.custom.backgroundColor : helpers.getValueAtIndexOrDefault(this.getDataset().backgroundColor, index, this.chart.options.elements.rectangle.backgroundColor),
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borderColor: rectangle.custom && rectangle.custom.borderColor ? rectangle.custom.borderColor : helpers.getValueAtIndexOrDefault(this.getDataset().borderColor, index, this.chart.options.elements.rectangle.borderColor),
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borderWidth: rectangle.custom && rectangle.custom.borderWidth ? rectangle.custom.borderWidth : helpers.getValueAtIndexOrDefault(this.getDataset().borderWidth, index, this.chart.options.elements.rectangle.borderWidth)
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}
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});
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rectangle.pivot();
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},
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calculateBarBase: function(datasetIndex, index) {
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var xScale = this.getScaleForId(this.getDataset().xAxisID);
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var yScale = this.getScaleForId(this.getDataset().yAxisID);
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var base = 0;
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if (yScale.options.stacked) {
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var value = this.chart.data.datasets[datasetIndex].data[index];
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if (value < 0) {
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for (var i = 0; i < datasetIndex; i++) {
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var negDS = this.chart.data.datasets[i];
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if (helpers.isDatasetVisible(negDS) && negDS.yAxisID === yScale.id && negDS.bar) {
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base += negDS.data[index] < 0 ? negDS.data[index] : 0;
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}
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}
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} else {
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for (var j = 0; j < datasetIndex; j++) {
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var posDS = this.chart.data.datasets[j];
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if (helpers.isDatasetVisible(posDS) && posDS.yAxisID === yScale.id && posDS.bar) {
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base += posDS.data[index] > 0 ? posDS.data[index] : 0;
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}
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}
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}
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return yScale.getPixelForValue(base);
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}
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base = yScale.getPixelForValue(yScale.min);
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if (yScale.beginAtZero || ((yScale.min <= 0 && yScale.max >= 0) || (yScale.min >= 0 && yScale.max <= 0))) {
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base = yScale.getPixelForValue(0, 0);
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//base += yScale.options.gridLines.lineWidth;
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} else if (yScale.min < 0 && yScale.max < 0) {
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// All values are negative. Use the top as the base
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base = yScale.getPixelForValue(yScale.max);
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}
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return base;
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},
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getRuler: function() {
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var xScale = this.getScaleForId(this.getDataset().xAxisID);
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var yScale = this.getScaleForId(this.getDataset().yAxisID);
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var datasetCount = this.getBarCount();
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var tickWidth = (function() {
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var min = xScale.getPixelForTick(1) - xScale.getPixelForTick(0);
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for (var i = 2; i < this.getDataset().data.length; i++) {
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min = Math.min(xScale.getPixelForTick(i) - xScale.getPixelForTick(i - 1), min);
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}
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return min;
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}).call(this);
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var categoryWidth = tickWidth * xScale.options.categoryPercentage;
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var categorySpacing = (tickWidth - (tickWidth * xScale.options.categoryPercentage)) / 2;
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var fullBarWidth = categoryWidth / datasetCount;
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var barWidth = fullBarWidth * xScale.options.barPercentage;
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var barSpacing = fullBarWidth - (fullBarWidth * xScale.options.barPercentage);
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return {
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datasetCount: datasetCount,
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tickWidth: tickWidth,
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categoryWidth: categoryWidth,
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categorySpacing: categorySpacing,
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fullBarWidth: fullBarWidth,
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barWidth: barWidth,
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barSpacing: barSpacing
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};
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},
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calculateBarWidth: function() {
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var xScale = this.getScaleForId(this.getDataset().xAxisID);
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var ruler = this.getRuler();
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return xScale.options.stacked ? ruler.categoryWidth : ruler.barWidth;
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},
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// Get bar index from the given dataset index accounting for the fact that not all bars are visible
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getBarIndex: function(datasetIndex) {
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var barIndex = 0;
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for (var j = 0; j < datasetIndex; ++j) {
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if (helpers.isDatasetVisible(this.chart.data.datasets[j]) && this.chart.data.datasets[j].bar) {
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++barIndex;
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}
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}
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return barIndex;
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},
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calculateBarX: function(index, datasetIndex) {
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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 barIndex = this.getBarIndex(datasetIndex);
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var ruler = this.getRuler();
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var leftTick = xScale.getPixelForValue(null, index, datasetIndex, this.chart.isCombo);
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leftTick -= this.chart.isCombo ? (ruler.tickWidth / 2) : 0;
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if (xScale.options.stacked) {
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return leftTick + (ruler.categoryWidth / 2) + ruler.categorySpacing;
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}
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return leftTick +
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(ruler.barWidth / 2) +
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ruler.categorySpacing +
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(ruler.barWidth * barIndex) +
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(ruler.barSpacing / 2) +
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(ruler.barSpacing * barIndex);
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},
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calculateBarY: function(index, datasetIndex) {
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var xScale = this.getScaleForId(this.getDataset().xAxisID);
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var yScale = this.getScaleForId(this.getDataset().yAxisID);
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var value = this.getDataset().data[index];
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if (yScale.options.stacked) {
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var sumPos = 0,
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sumNeg = 0;
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for (var i = 0; i < datasetIndex; i++) {
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var ds = this.chart.data.datasets[i];
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if (helpers.isDatasetVisible(ds) && ds.bar && ds.yAxisID === yScale.id) {
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if (ds.data[index] < 0) {
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sumNeg += ds.data[index] || 0;
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} else {
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sumPos += ds.data[index] || 0;
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}
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}
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}
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if (value < 0) {
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return yScale.getPixelForValue(sumNeg + value);
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} else {
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return yScale.getPixelForValue(sumPos + value);
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}
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return yScale.getPixelForValue(value);
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}
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return yScale.getPixelForValue(value);
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},
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draw: function(ease) {
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var easingDecimal = ease || 1;
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helpers.each(this.getDataset().metaData, function(rectangle, index) {
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var d = this.getDataset().data[index];
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if (d !== null && d !== undefined && !isNaN(d)) {
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rectangle.transition(easingDecimal).draw();
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}
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}, this);
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},
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setHoverStyle: function(rectangle) {
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var dataset = this.chart.data.datasets[rectangle._datasetIndex];
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var index = rectangle._index;
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rectangle._model.backgroundColor = rectangle.custom && rectangle.custom.hoverBackgroundColor ? rectangle.custom.hoverBackgroundColor : helpers.getValueAtIndexOrDefault(dataset.hoverBackgroundColor, index, helpers.color(rectangle._model.backgroundColor).saturate(0.5).darken(0.1).rgbString());
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rectangle._model.borderColor = rectangle.custom && rectangle.custom.hoverBorderColor ? rectangle.custom.hoverBorderColor : helpers.getValueAtIndexOrDefault(dataset.hoverBorderColor, index, helpers.color(rectangle._model.borderColor).saturate(0.5).darken(0.1).rgbString());
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rectangle._model.borderWidth = rectangle.custom && rectangle.custom.hoverBorderWidth ? rectangle.custom.hoverBorderWidth : helpers.getValueAtIndexOrDefault(dataset.hoverBorderWidth, index, rectangle._model.borderWidth);
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},
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removeHoverStyle: function(rectangle) {
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var dataset = this.chart.data.datasets[rectangle._datasetIndex];
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var index = rectangle._index;
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rectangle._model.backgroundColor = rectangle.custom && rectangle.custom.backgroundColor ? rectangle.custom.backgroundColor : helpers.getValueAtIndexOrDefault(this.getDataset().backgroundColor, index, this.chart.options.elements.rectangle.backgroundColor);
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rectangle._model.borderColor = rectangle.custom && rectangle.custom.borderColor ? rectangle.custom.borderColor : helpers.getValueAtIndexOrDefault(this.getDataset().borderColor, index, this.chart.options.elements.rectangle.borderColor);
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rectangle._model.borderWidth = rectangle.custom && rectangle.custom.borderWidth ? rectangle.custom.borderWidth : helpers.getValueAtIndexOrDefault(this.getDataset().borderWidth, index, this.chart.options.elements.rectangle.borderWidth);
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}
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});
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};
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