291 lines
12 KiB
JavaScript
Executable File
291 lines
12 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.line = {
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showLines: true,
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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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id: 'x-axis-0'
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}],
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yAxes: [{
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type: "linear",
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id: 'y-axis-0'
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}]
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}
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};
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Chart.controllers.line = Chart.DatasetController.extend({
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addElements: function() {
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this.getDataset().metaData = this.getDataset().metaData || [];
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this.getDataset().metaDataset = this.getDataset().metaDataset || new Chart.elements.Line({
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_chart: this.chart.chart,
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_datasetIndex: this.index,
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_points: this.getDataset().metaData
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});
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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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// Make sure bezier control points are updated
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if (this.chart.options.showLines && this.chart.options.elements.line.tension !== 0)
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this.updateBezierControlPoints();
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},
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update: function update(reset) {
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var line = this.getDataset().metaDataset;
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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 Line
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if (this.chart.options.showLines) {
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// Utility
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line._scale = yScale;
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line._datasetIndex = this.index;
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// Data
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line._children = points;
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// Model
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line._model = {
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// Appearance
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tension: line.custom && line.custom.tension ? line.custom.tension : helpers.getValueOrDefault(this.getDataset().tension, this.chart.options.elements.line.tension),
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backgroundColor: line.custom && line.custom.backgroundColor ? line.custom.backgroundColor : (this.getDataset().backgroundColor || this.chart.options.elements.line.backgroundColor),
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borderWidth: line.custom && line.custom.borderWidth ? line.custom.borderWidth : (this.getDataset().borderWidth || this.chart.options.elements.line.borderWidth),
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borderColor: line.custom && line.custom.borderColor ? line.custom.borderColor : (this.getDataset().borderColor || this.chart.options.elements.line.borderColor),
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borderCapStyle: line.custom && line.custom.borderCapStyle ? line.custom.borderCapStyle : (this.getDataset().borderCapStyle || this.chart.options.elements.line.borderCapStyle),
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borderDash: line.custom && line.custom.borderDash ? line.custom.borderDash : (this.getDataset().borderDash || this.chart.options.elements.line.borderDash),
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borderDashOffset: line.custom && line.custom.borderDashOffset ? line.custom.borderDashOffset : (this.getDataset().borderDashOffset || this.chart.options.elements.line.borderDashOffset),
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borderJoinStyle: line.custom && line.custom.borderJoinStyle ? line.custom.borderJoinStyle : (this.getDataset().borderJoinStyle || this.chart.options.elements.line.borderJoinStyle),
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fill: line.custom && line.custom.fill ? line.custom.fill : (this.getDataset().fill !== undefined ? this.getDataset().fill : this.chart.options.elements.line.fill),
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// Scale
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scaleTop: yScale.top,
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scaleBottom: yScale.bottom,
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scaleZero: scaleBase
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};
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line.pivot();
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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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if (this.chart.options.showLines && this.chart.options.elements.line.tension !== 0)
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this.updateBezierControlPoints();
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},
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getPointBackgroundColor: function(point, index) {
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var backgroundColor = this.chart.options.elements.point.backgroundColor;
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var dataset = this.getDataset();
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if (point.custom && point.custom.backgroundColor) {
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backgroundColor = point.custom.backgroundColor;
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} else if (dataset.pointBackgroundColor) {
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backgroundColor = helpers.getValueAtIndexOrDefault(dataset.pointBackgroundColor, index, backgroundColor);
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} else if (dataset.backgroundColor) {
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backgroundColor = dataset.backgroundColor;
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}
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return backgroundColor;
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},
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getPointBorderColor: function(point, index) {
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var borderColor = this.chart.options.elements.point.borderColor;
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var dataset = this.getDataset();
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if (point.custom && point.custom.borderColor) {
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borderColor = point.custom.borderColor;
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} else if (dataset.pointBorderColor) {
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borderColor = helpers.getValueAtIndexOrDefault(this.getDataset().pointBorderColor, index, borderColor);
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} else if (dataset.borderColor) {
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borderColor = dataset.borderColor;
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}
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return borderColor;
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},
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getPointBorderWidth: function(point, index) {
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var borderWidth = this.chart.options.elements.point.borderWidth;
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var dataset = this.getDataset();
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if (point.custom && point.custom.borderWidth !== undefined) {
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borderWidth = point.custom.borderWidth;
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} else if (dataset.pointBorderWidth !== undefined) {
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borderWidth = helpers.getValueAtIndexOrDefault(dataset.pointBorderWidth, index, borderWidth);
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} else if (dataset.borderWidth !== undefined) {
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borderWidth = dataset.borderWidth;
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}
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return borderWidth;
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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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// Utility
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point._chart = this.chart.chart;
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point._xScale = xScale;
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point._yScale = yScale;
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point._datasetIndex = this.index;
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point._index = index;
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// Desired view properties
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point._model = {
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x: xScale.getPixelForValue(this.getDataset().data[index], index, this.index, this.chart.isCombo),
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y: reset ? scaleBase : this.calculatePointY(this.getDataset().data[index], index, this.index, this.chart.isCombo),
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// Appearance
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tension: point.custom && point.custom.tension ? point.custom.tension : helpers.getValueOrDefault(this.getDataset().tension, this.chart.options.elements.line.tension),
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radius: point.custom && point.custom.radius ? point.custom.radius : helpers.getValueAtIndexOrDefault(this.getDataset().radius, index, this.chart.options.elements.point.radius),
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pointStyle: point.custom && point.custom.pointStyle ? point.custom.pointStyle : helpers.getValueAtIndexOrDefault(this.getDataset().pointStyle, index, this.chart.options.elements.point.pointStyle),
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backgroundColor: this.getPointBackgroundColor(point, index),
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borderColor: this.getPointBorderColor(point, index),
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borderWidth: this.getPointBorderWidth(point, index),
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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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point._model.skip = point.custom && point.custom.skip ? point.custom.skip : (isNaN(point._model.x) || isNaN(point._model.y));
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},
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calculatePointY: function(value, index, datasetIndex, isCombo) {
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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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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 (ds.type === 'line' && helpers.isDatasetVisible(ds)) {
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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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}
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return yScale.getPixelForValue(value);
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},
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updateBezierControlPoints: function() {
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// Update bezier control points
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helpers.each(this.getDataset().metaData, function(point, index) {
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var controlPoints = helpers.splineCurve(
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helpers.previousItem(this.getDataset().metaData, index)._model,
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point._model,
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helpers.nextItem(this.getDataset().metaData, index)._model,
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point._model.tension
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);
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// Prevent the bezier going outside of the bounds of the graph
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point._model.controlPointPreviousX = Math.max(Math.min(controlPoints.previous.x, this.chart.chartArea.right), this.chart.chartArea.left);
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point._model.controlPointPreviousY = Math.max(Math.min(controlPoints.previous.y, this.chart.chartArea.bottom), this.chart.chartArea.top);
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point._model.controlPointNextX = Math.max(Math.min(controlPoints.next.x, this.chart.chartArea.right), this.chart.chartArea.left);
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point._model.controlPointNextY = Math.max(Math.min(controlPoints.next.y, this.chart.chartArea.bottom), this.chart.chartArea.top);
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// Now pivot the point for animation
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point.pivot();
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}, this);
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},
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draw: function(ease) {
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var easingDecimal = ease || 1;
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// Transition Point Locations
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helpers.each(this.getDataset().metaData, function(point) {
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point.transition(easingDecimal);
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});
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// Transition and Draw the line
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if (this.chart.options.showLines)
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this.getDataset().metaDataset.transition(easingDecimal).draw();
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// Draw the points
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helpers.each(this.getDataset().metaData, function(point) {
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point.draw();
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});
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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.pointHoverRadius, index, this.chart.options.elements.point.hoverRadius);
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point._model.backgroundColor = point.custom && point.custom.hoverBackgroundColor ? point.custom.hoverBackgroundColor : helpers.getValueAtIndexOrDefault(dataset.pointHoverBackgroundColor, 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.pointHoverBorderColor, 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.pointHoverBorderWidth, 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 : helpers.getValueAtIndexOrDefault(this.getDataset().radius, index, this.chart.options.elements.point.radius);
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point._model.backgroundColor = this.getPointBackgroundColor(point, index);
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point._model.borderColor = this.getPointBorderColor(point, index);
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point._model.borderWidth = this.getPointBorderWidth(point, index);
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}
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});
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};
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