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File: bootstrap/chartjs/src/Chart.Line.js

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File: bootstrap/chartjs/src/Chart.Line.js
Role: Auxiliary data
Content type: text/plain
Description: Auxiliary data
Class: Noblesse CMS
Content management system with custom plugins
Author: By
Last change:
Date: 8 years ago
Size: 12,059 bytes
 

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(function(){ "use strict"; var root = this, Chart = root.Chart, helpers = Chart.helpers; var defaultConfig = { ///Boolean - Whether grid lines are shown across the chart scaleShowGridLines : true, //String - Colour of the grid lines scaleGridLineColor : "rgba(0,0,0,.05)", //Number - Width of the grid lines scaleGridLineWidth : 1, //Boolean - Whether to show horizontal lines (except X axis) scaleShowHorizontalLines: true, //Boolean - Whether to show vertical lines (except Y axis) scaleShowVerticalLines: true, //Boolean - Whether the line is curved between points bezierCurve : true, //Number - Tension of the bezier curve between points bezierCurveTension : 0.4, //Boolean - Whether to show a dot for each point pointDot : true, //Number - Radius of each point dot in pixels pointDotRadius : 4, //Number - Pixel width of point dot stroke pointDotStrokeWidth : 1, //Number - amount extra to add to the radius to cater for hit detection outside the drawn point pointHitDetectionRadius : 20, //Boolean - Whether to show a stroke for datasets datasetStroke : true, //Number - Pixel width of dataset stroke datasetStrokeWidth : 2, //Boolean - Whether to fill the dataset with a colour datasetFill : true, //String - A legend template legendTemplate : "<ul class=\"<%=name.toLowerCase()%>-legend\"><% for (var i=0; i<datasets.length; i++){%><li><span style=\"background-color:<%=datasets[i].strokeColor%>\"><%if(datasets[i].label){%><%=datasets[i].label%><%}%></span></li><%}%></ul>", //Boolean - Whether to horizontally center the label and point dot inside the grid offsetGridLines : false }; Chart.Type.extend({ name: "Line", defaults : defaultConfig, initialize: function(data){ //Declare the extension of the default point, to cater for the options passed in to the constructor this.PointClass = Chart.Point.extend({ offsetGridLines : this.options.offsetGridLines, strokeWidth : this.options.pointDotStrokeWidth, radius : this.options.pointDotRadius, display: this.options.pointDot, hitDetectionRadius : this.options.pointHitDetectionRadius, ctx : this.chart.ctx, inRange : function(mouseX){ return (Math.pow(mouseX-this.x, 2) < Math.pow(this.radius + this.hitDetectionRadius,2)); } }); this.datasets = []; //Set up tooltip events on the chart if (this.options.showTooltips){ helpers.bindEvents(this, this.options.tooltipEvents, function(evt){ var activePoints = (evt.type !== 'mouseout') ? this.getPointsAtEvent(evt) : []; this.eachPoints(function(point){ point.restore(['fillColor', 'strokeColor']); }); helpers.each(activePoints, function(activePoint){ activePoint.fillColor = activePoint.highlightFill; activePoint.strokeColor = activePoint.highlightStroke; }); this.showTooltip(activePoints); }); } //Iterate through each of the datasets, and build this into a property of the chart helpers.each(data.datasets,function(dataset){ var datasetObject = { label : dataset.label || null, fillColor : dataset.fillColor, strokeColor : dataset.strokeColor, pointColor : dataset.pointColor, pointStrokeColor : dataset.pointStrokeColor, points : [] }; this.datasets.push(datasetObject); helpers.each(dataset.data,function(dataPoint,index){ //Add a new point for each piece of data, passing any required data to draw. datasetObject.points.push(new this.PointClass({ value : dataPoint, label : data.labels[index], datasetLabel: dataset.label, strokeColor : dataset.pointStrokeColor, fillColor : dataset.pointColor, highlightFill : dataset.pointHighlightFill || dataset.pointColor, highlightStroke : dataset.pointHighlightStroke || dataset.pointStrokeColor })); },this); this.buildScale(data.labels); this.eachPoints(function(point, index){ helpers.extend(point, { x: this.scale.calculateX(index), y: this.scale.endPoint }); point.save(); }, this); },this); this.render(); }, update : function(){ this.scale.update(); // Reset any highlight colours before updating. helpers.each(this.activeElements, function(activeElement){ activeElement.restore(['fillColor', 'strokeColor']); }); this.eachPoints(function(point){ point.save(); }); this.render(); }, eachPoints : function(callback){ helpers.each(this.datasets,function(dataset){ helpers.each(dataset.points,callback,this); },this); }, getPointsAtEvent : function(e){ var pointsArray = [], eventPosition = helpers.getRelativePosition(e); helpers.each(this.datasets,function(dataset){ helpers.each(dataset.points,function(point){ if (point.inRange(eventPosition.x,eventPosition.y)) pointsArray.push(point); }); },this); return pointsArray; }, buildScale : function(labels){ var self = this; var dataTotal = function(){ var values = []; self.eachPoints(function(point){ values.push(point.value); }); return values; }; var scaleOptions = { templateString : this.options.scaleLabel, height : this.chart.height, width : this.chart.width, ctx : this.chart.ctx, textColor : this.options.scaleFontColor, offsetGridLines : this.options.offsetGridLines, fontSize : this.options.scaleFontSize, fontStyle : this.options.scaleFontStyle, fontFamily : this.options.scaleFontFamily, valuesCount : labels.length, beginAtZero : this.options.scaleBeginAtZero, integersOnly : this.options.scaleIntegersOnly, calculateYRange : function(currentHeight){ var updatedRanges = helpers.calculateScaleRange( dataTotal(), currentHeight, this.fontSize, this.beginAtZero, this.integersOnly ); helpers.extend(this, updatedRanges); }, xLabels : labels, font : helpers.fontString(this.options.scaleFontSize, this.options.scaleFontStyle, this.options.scaleFontFamily), lineWidth : this.options.scaleLineWidth, lineColor : this.options.scaleLineColor, showHorizontalLines : this.options.scaleShowHorizontalLines, showVerticalLines : this.options.scaleShowVerticalLines, gridLineWidth : (this.options.scaleShowGridLines) ? this.options.scaleGridLineWidth : 0, gridLineColor : (this.options.scaleShowGridLines) ? this.options.scaleGridLineColor : "rgba(0,0,0,0)", padding: (this.options.showScale) ? 0 : this.options.pointDotRadius + this.options.pointDotStrokeWidth, showLabels : this.options.scaleShowLabels, display : this.options.showScale }; if (this.options.scaleOverride){ helpers.extend(scaleOptions, { calculateYRange: helpers.noop, steps: this.options.scaleSteps, stepValue: this.options.scaleStepWidth, min: this.options.scaleStartValue, max: this.options.scaleStartValue + (this.options.scaleSteps * this.options.scaleStepWidth) }); } this.scale = new Chart.Scale(scaleOptions); }, addData : function(valuesArray,label){ //Map the values array for each of the datasets helpers.each(valuesArray,function(value,datasetIndex){ //Add a new point for each piece of data, passing any required data to draw. this.datasets[datasetIndex].points.push(new this.PointClass({ value : value, label : label, datasetLabel: this.datasets[datasetIndex].label, x: this.scale.calculateX(this.scale.valuesCount+1), y: this.scale.endPoint, strokeColor : this.datasets[datasetIndex].pointStrokeColor, fillColor : this.datasets[datasetIndex].pointColor })); },this); this.scale.addXLabel(label); //Then re-render the chart. this.update(); }, removeData : function(){ this.scale.removeXLabel(); //Then re-render the chart. helpers.each(this.datasets,function(dataset){ dataset.points.shift(); },this); this.update(); }, reflow : function(){ var newScaleProps = helpers.extend({ height : this.chart.height, width : this.chart.width }); this.scale.update(newScaleProps); }, draw : function(ease){ var easingDecimal = ease || 1; this.clear(); var ctx = this.chart.ctx; // Some helper methods for getting the next/prev points var hasValue = function(item){ return item.value !== null; }, nextPoint = function(point, collection, index){ return helpers.findNextWhere(collection, hasValue, index) || point; }, previousPoint = function(point, collection, index){ return helpers.findPreviousWhere(collection, hasValue, index) || point; }; this.scale.draw(easingDecimal); helpers.each(this.datasets,function(dataset){ var pointsWithValues = helpers.where(dataset.points, hasValue); //Transition each point first so that the line and point drawing isn't out of sync //We can use this extra loop to calculate the control points of this dataset also in this loop helpers.each(dataset.points, function(point, index){ if (point.hasValue()){ point.transition({ y : this.scale.calculateY(point.value), x : this.scale.calculateX(index) }, easingDecimal); } },this); // Control points need to be calculated in a separate loop, because we need to know the current x/y of the point // This would cause issues when there is no animation, because the y of the next point would be 0, so beziers would be skewed if (this.options.bezierCurve){ helpers.each(pointsWithValues, function(point, index){ var tension = (index > 0 && index < pointsWithValues.length - 1) ? this.options.bezierCurveTension : 0; point.controlPoints = helpers.splineCurve( previousPoint(point, pointsWithValues, index), point, nextPoint(point, pointsWithValues, index), tension ); // Prevent the bezier going outside of the bounds of the graph // Cap puter bezier handles to the upper/lower scale bounds if (point.controlPoints.outer.y > this.scale.endPoint){ point.controlPoints.outer.y = this.scale.endPoint; } else if (point.controlPoints.outer.y < this.scale.startPoint){ point.controlPoints.outer.y = this.scale.startPoint; } // Cap inner bezier handles to the upper/lower scale bounds if (point.controlPoints.inner.y > this.scale.endPoint){ point.controlPoints.inner.y = this.scale.endPoint; } else if (point.controlPoints.inner.y < this.scale.startPoint){ point.controlPoints.inner.y = this.scale.startPoint; } },this); } //Draw the line between all the points ctx.lineWidth = this.options.datasetStrokeWidth; ctx.strokeStyle = dataset.strokeColor; ctx.beginPath(); helpers.each(pointsWithValues, function(point, index){ if (index === 0){ ctx.moveTo(point.x, point.y); } else{ if(this.options.bezierCurve){ var previous = previousPoint(point, pointsWithValues, index); ctx.bezierCurveTo( previous.controlPoints.outer.x, previous.controlPoints.outer.y, point.controlPoints.inner.x, point.controlPoints.inner.y, point.x, point.y ); } else{ ctx.lineTo(point.x,point.y); } } }, this); ctx.stroke(); if (this.options.datasetFill && pointsWithValues.length > 0){ //Round off the line by going to the base of the chart, back to the start, then fill. ctx.lineTo(pointsWithValues[pointsWithValues.length - 1].x, this.scale.endPoint); ctx.lineTo(pointsWithValues[0].x, this.scale.endPoint); ctx.fillStyle = dataset.fillColor; ctx.closePath(); ctx.fill(); } //Now draw the points over the line //A little inefficient double looping, but better than the line //lagging behind the point positions helpers.each(pointsWithValues,function(point){ point.draw(); }); },this); } }); }).call(this);