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341 lines
11 KiB
JavaScript
341 lines
11 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 valueOrDefault = helpers.valueOrDefault;
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var resolve = helpers.options.resolve;
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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 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: valueOrDefault(dataset.spanGaps, options.spanGaps),
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tension: resolve([custom.tension, dataset.lineTension, lineElementOptions.tension]),
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backgroundColor: resolve([custom.backgroundColor, dataset.backgroundColor, lineElementOptions.backgroundColor]),
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borderWidth: resolve([custom.borderWidth, dataset.borderWidth, lineElementOptions.borderWidth]),
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borderColor: resolve([custom.borderColor, dataset.borderColor, lineElementOptions.borderColor]),
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borderCapStyle: resolve([custom.borderCapStyle, dataset.borderCapStyle, lineElementOptions.borderCapStyle]),
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borderDash: resolve([custom.borderDash, dataset.borderDash, lineElementOptions.borderDash]),
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borderDashOffset: resolve([custom.borderDashOffset, dataset.borderDashOffset, lineElementOptions.borderDashOffset]),
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borderJoinStyle: resolve([custom.borderJoinStyle, dataset.borderJoinStyle, lineElementOptions.borderJoinStyle]),
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fill: resolve([custom.fill, dataset.fill, lineElementOptions.fill]),
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steppedLine: resolve([custom.steppedLine, dataset.steppedLine, lineElementOptions.stepped]),
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cubicInterpolationMode: resolve([custom.cubicInterpolationMode, 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 dataset = this.getDataset();
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var custom = point.custom || {};
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return resolve([
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custom.backgroundColor,
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dataset.pointBackgroundColor,
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dataset.backgroundColor,
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this.chart.options.elements.point.backgroundColor
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], undefined, index);
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},
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getPointBorderColor: function(point, index) {
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var dataset = this.getDataset();
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var custom = point.custom || {};
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return resolve([
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custom.borderColor,
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dataset.pointBorderColor,
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dataset.borderColor,
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this.chart.options.elements.point.borderColor
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], undefined, index);
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},
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getPointBorderWidth: function(point, index) {
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var dataset = this.getDataset();
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var custom = point.custom || {};
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return resolve([
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custom.borderWidth,
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dataset.pointBorderWidth,
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dataset.borderWidth,
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this.chart.options.elements.point.borderWidth
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], undefined, index);
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},
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getPointRotation: function(point, index) {
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var custom = point.custom || {};
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return resolve([
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custom.rotation,
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this.getDataset().pointRotation,
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this.chart.options.elements.point.rotation
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], undefined, index);
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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: resolve([custom.radius, dataset.pointRadius, pointOptions.radius], undefined, index),
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pointStyle: resolve([custom.pointStyle, dataset.pointStyle, pointOptions.pointStyle], undefined, index),
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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: resolve([custom.hitRadius, dataset.pointHitRadius, pointOptions.hitRadius], undefined, index)
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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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var getHoverColor = helpers.getHoverColor;
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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 = resolve([custom.hoverBackgroundColor, dataset.pointHoverBackgroundColor, getHoverColor(model.backgroundColor)], undefined, index);
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model.borderColor = resolve([custom.hoverBorderColor, dataset.pointHoverBorderColor, getHoverColor(model.borderColor)], undefined, index);
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model.borderWidth = resolve([custom.hoverBorderWidth, dataset.pointHoverBorderWidth, model.borderWidth], undefined, index);
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model.radius = resolve([custom.hoverRadius, dataset.pointHoverRadius, this.chart.options.elements.point.hoverRadius], undefined, index);
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}
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});
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