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353 lines
12 KiB
JavaScript
353 lines
12 KiB
JavaScript
'use strict';
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var DatasetController = require('../core/core.datasetController');
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var defaults = require('../core/core.defaults');
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var elements = require('../elements/index');
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var helpers = require('../helpers/index');
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var _isPointInArea = helpers.canvas._isPointInArea;
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defaults._set('line', {
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showLines: true,
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spanGaps: false,
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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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function lineEnabled(dataset, options) {
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return helpers.valueOrDefault(dataset.showLine, options.showLines);
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}
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module.exports = DatasetController.extend({
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datasetElementType: elements.Line,
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dataElementType: elements.Point,
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update: function(reset) {
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var me = this;
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var meta = me.getMeta();
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var line = meta.dataset;
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var points = meta.data || [];
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var options = me.chart.options;
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var lineElementOptions = options.elements.line;
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var scale = me.getScaleForId(meta.yAxisID);
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var i, ilen, custom;
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var dataset = me.getDataset();
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var showLine = lineEnabled(dataset, options);
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// Update Line
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if (showLine) {
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custom = line.custom || {};
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// Compatibility: If the properties are defined with only the old name, use those values
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if ((dataset.tension !== undefined) && (dataset.lineTension === undefined)) {
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dataset.lineTension = dataset.tension;
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}
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// Utility
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line._scale = scale;
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line._datasetIndex = me.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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// The default behavior of lines is to break at null values, according
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// to https://github.com/chartjs/Chart.js/issues/2435#issuecomment-216718158
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// This option gives lines the ability to span gaps
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spanGaps: dataset.spanGaps ? dataset.spanGaps : options.spanGaps,
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tension: custom.tension ? custom.tension : helpers.valueOrDefault(dataset.lineTension, lineElementOptions.tension),
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backgroundColor: custom.backgroundColor ? custom.backgroundColor : (dataset.backgroundColor || lineElementOptions.backgroundColor),
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borderWidth: custom.borderWidth ? custom.borderWidth : (dataset.borderWidth || lineElementOptions.borderWidth),
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borderColor: custom.borderColor ? custom.borderColor : (dataset.borderColor || lineElementOptions.borderColor),
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borderCapStyle: custom.borderCapStyle ? custom.borderCapStyle : (dataset.borderCapStyle || lineElementOptions.borderCapStyle),
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borderDash: custom.borderDash ? custom.borderDash : (dataset.borderDash || lineElementOptions.borderDash),
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borderDashOffset: custom.borderDashOffset ? custom.borderDashOffset : (dataset.borderDashOffset || lineElementOptions.borderDashOffset),
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borderJoinStyle: custom.borderJoinStyle ? custom.borderJoinStyle : (dataset.borderJoinStyle || lineElementOptions.borderJoinStyle),
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fill: custom.fill ? custom.fill : (dataset.fill !== undefined ? dataset.fill : lineElementOptions.fill),
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steppedLine: custom.steppedLine ? custom.steppedLine : helpers.valueOrDefault(dataset.steppedLine, lineElementOptions.stepped),
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cubicInterpolationMode: custom.cubicInterpolationMode ? custom.cubicInterpolationMode : helpers.valueOrDefault(dataset.cubicInterpolationMode, lineElementOptions.cubicInterpolationMode),
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};
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line.pivot();
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}
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// Update Points
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for (i = 0, ilen = points.length; i < ilen; ++i) {
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me.updateElement(points[i], i, reset);
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}
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if (showLine && line._model.tension !== 0) {
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me.updateBezierControlPoints();
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}
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// Now pivot the point for animation
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for (i = 0, ilen = points.length; i < ilen; ++i) {
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points[i].pivot();
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}
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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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var custom = point.custom || {};
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if (custom.backgroundColor) {
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backgroundColor = custom.backgroundColor;
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} else if (dataset.pointBackgroundColor) {
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backgroundColor = helpers.valueAtIndexOrDefault(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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var custom = point.custom || {};
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if (custom.borderColor) {
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borderColor = custom.borderColor;
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} else if (dataset.pointBorderColor) {
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borderColor = helpers.valueAtIndexOrDefault(dataset.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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var custom = point.custom || {};
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if (!isNaN(custom.borderWidth)) {
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borderWidth = custom.borderWidth;
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} else if (!isNaN(dataset.pointBorderWidth) || helpers.isArray(dataset.pointBorderWidth)) {
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borderWidth = helpers.valueAtIndexOrDefault(dataset.pointBorderWidth, index, borderWidth);
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} else if (!isNaN(dataset.borderWidth)) {
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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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getPointRotation: function(point, index) {
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var pointRotation = this.chart.options.elements.point.rotation;
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var dataset = this.getDataset();
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var custom = point.custom || {};
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if (!isNaN(custom.rotation)) {
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pointRotation = custom.rotation;
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} else if (!isNaN(dataset.pointRotation) || helpers.isArray(dataset.pointRotation)) {
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pointRotation = helpers.valueAtIndexOrDefault(dataset.pointRotation, index, pointRotation);
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}
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return pointRotation;
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},
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updateElement: function(point, index, reset) {
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var me = this;
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var meta = me.getMeta();
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var custom = point.custom || {};
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var dataset = me.getDataset();
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var datasetIndex = me.index;
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var value = dataset.data[index];
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var yScale = me.getScaleForId(meta.yAxisID);
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var xScale = me.getScaleForId(meta.xAxisID);
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var pointOptions = me.chart.options.elements.point;
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var x, y;
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// Compatibility: If the properties are defined with only the old name, use those values
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if ((dataset.radius !== undefined) && (dataset.pointRadius === undefined)) {
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dataset.pointRadius = dataset.radius;
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}
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if ((dataset.hitRadius !== undefined) && (dataset.pointHitRadius === undefined)) {
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dataset.pointHitRadius = dataset.hitRadius;
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}
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x = xScale.getPixelForValue(typeof value === 'object' ? value : NaN, index, datasetIndex);
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y = reset ? yScale.getBasePixel() : me.calculatePointY(value, index, datasetIndex);
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// Utility
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point._xScale = xScale;
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point._yScale = yScale;
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point._datasetIndex = datasetIndex;
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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: x,
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y: y,
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skip: custom.skip || isNaN(x) || isNaN(y),
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// Appearance
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radius: custom.radius || helpers.valueAtIndexOrDefault(dataset.pointRadius, index, pointOptions.radius),
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pointStyle: custom.pointStyle || helpers.valueAtIndexOrDefault(dataset.pointStyle, index, pointOptions.pointStyle),
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rotation: me.getPointRotation(point, index),
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backgroundColor: me.getPointBackgroundColor(point, index),
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borderColor: me.getPointBorderColor(point, index),
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borderWidth: me.getPointBorderWidth(point, index),
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tension: meta.dataset._model ? meta.dataset._model.tension : 0,
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steppedLine: meta.dataset._model ? meta.dataset._model.steppedLine : false,
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// Tooltip
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hitRadius: custom.hitRadius || helpers.valueAtIndexOrDefault(dataset.pointHitRadius, index, pointOptions.hitRadius)
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};
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},
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calculatePointY: function(value, index, datasetIndex) {
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var me = this;
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var chart = me.chart;
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var meta = me.getMeta();
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var yScale = me.getScaleForId(meta.yAxisID);
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var sumPos = 0;
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var sumNeg = 0;
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var i, ds, dsMeta;
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if (yScale.options.stacked) {
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for (i = 0; i < datasetIndex; i++) {
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ds = chart.data.datasets[i];
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dsMeta = chart.getDatasetMeta(i);
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if (dsMeta.type === 'line' && dsMeta.yAxisID === yScale.id && chart.isDatasetVisible(i)) {
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var stackedRightValue = Number(yScale.getRightValue(ds.data[index]));
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if (stackedRightValue < 0) {
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sumNeg += stackedRightValue || 0;
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} else {
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sumPos += stackedRightValue || 0;
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}
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}
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}
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var rightValue = Number(yScale.getRightValue(value));
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if (rightValue < 0) {
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return yScale.getPixelForValue(sumNeg + rightValue);
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}
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return yScale.getPixelForValue(sumPos + rightValue);
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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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var me = this;
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var chart = me.chart;
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var meta = me.getMeta();
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var lineModel = meta.dataset._model;
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var area = chart.chartArea;
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var points = meta.data || [];
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var i, ilen, point, model, controlPoints;
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// Only consider points that are drawn in case the spanGaps option is used
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if (lineModel.spanGaps) {
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points = points.filter(function(pt) {
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return !pt._model.skip;
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});
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}
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function capControlPoint(pt, min, max) {
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return Math.max(Math.min(pt, max), min);
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}
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if (lineModel.cubicInterpolationMode === 'monotone') {
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helpers.splineCurveMonotone(points);
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} else {
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for (i = 0, ilen = points.length; i < ilen; ++i) {
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point = points[i];
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model = point._model;
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controlPoints = helpers.splineCurve(
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helpers.previousItem(points, i)._model,
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model,
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helpers.nextItem(points, i)._model,
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lineModel.tension
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);
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model.controlPointPreviousX = controlPoints.previous.x;
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model.controlPointPreviousY = controlPoints.previous.y;
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model.controlPointNextX = controlPoints.next.x;
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model.controlPointNextY = controlPoints.next.y;
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}
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}
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if (chart.options.elements.line.capBezierPoints) {
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for (i = 0, ilen = points.length; i < ilen; ++i) {
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model = points[i]._model;
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if (_isPointInArea(model, area)) {
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if (i > 0 && _isPointInArea(points[i - 1]._model, area)) {
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model.controlPointPreviousX = capControlPoint(model.controlPointPreviousX, area.left, area.right);
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model.controlPointPreviousY = capControlPoint(model.controlPointPreviousY, area.top, area.bottom);
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}
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if (i < points.length - 1 && _isPointInArea(points[i + 1]._model, area)) {
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model.controlPointNextX = capControlPoint(model.controlPointNextX, area.left, area.right);
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model.controlPointNextY = capControlPoint(model.controlPointNextY, area.top, area.bottom);
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}
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}
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}
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}
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},
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draw: function() {
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var me = this;
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var chart = me.chart;
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var meta = me.getMeta();
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var points = meta.data || [];
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var area = chart.chartArea;
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var ilen = points.length;
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var halfBorderWidth;
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var i = 0;
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if (lineEnabled(me.getDataset(), chart.options)) {
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halfBorderWidth = (meta.dataset._model.borderWidth || 0) / 2;
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helpers.canvas.clipArea(chart.ctx, {
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left: area.left,
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right: area.right,
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top: area.top - halfBorderWidth,
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bottom: area.bottom + halfBorderWidth
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});
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meta.dataset.draw();
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helpers.canvas.unclipArea(chart.ctx);
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}
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// Draw the points
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for (; i < ilen; ++i) {
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points[i].draw(area);
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}
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},
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setHoverStyle: function(element) {
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// Point
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var dataset = this.chart.data.datasets[element._datasetIndex];
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var index = element._index;
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var custom = element.custom || {};
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var model = element._model;
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element.$previousStyle = {
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backgroundColor: model.backgroundColor,
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borderColor: model.borderColor,
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borderWidth: model.borderWidth,
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radius: model.radius
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};
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model.backgroundColor = custom.hoverBackgroundColor || helpers.valueAtIndexOrDefault(dataset.pointHoverBackgroundColor, index, helpers.getHoverColor(model.backgroundColor));
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model.borderColor = custom.hoverBorderColor || helpers.valueAtIndexOrDefault(dataset.pointHoverBorderColor, index, helpers.getHoverColor(model.borderColor));
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model.borderWidth = custom.hoverBorderWidth || helpers.valueAtIndexOrDefault(dataset.pointHoverBorderWidth, index, model.borderWidth);
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model.radius = custom.hoverRadius || helpers.valueAtIndexOrDefault(dataset.pointHoverRadius, index, this.chart.options.elements.point.hoverRadius);
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}
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});
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