},
draw: function() {
- var ctx = this._chart.ctx;
+ var ctx = this.ctx;
var vm = this._vm;
ctx.beginPath();
},
});
- Chart.RadialScale = Chart.Element.extend({
- initialize: function() {
- this.size = min([this.height, this.width]);
- this.drawingArea = (this.display) ? (this.size / 2) - (this.fontSize / 2 + this.backdropPaddingY) : (this.size / 2);
- },
- calculateCenterOffset: function(value) {
- // Take into account half font size + the yPadding of the top value
- var scalingFactor = this.drawingArea / (this.max - this.min);
-
- return (value - this.min) * scalingFactor;
- },
- update: function() {
- if (!this.lineArc) {
- this.setScaleSize();
- } else {
- this.drawingArea = (this.display) ? (this.size / 2) - (this.fontSize / 2 + this.backdropPaddingY) : (this.size / 2);
- }
- this.buildYLabels();
- },
- buildYLabels: function() {
- this.yLabels = [];
-
- var stepDecimalPlaces = getDecimalPlaces(this.stepValue);
-
- for (var i = 0; i <= this.steps; i++) {
- this.yLabels.push(template(this.templateString, {
- value: (this.min + (i * this.stepValue)).toFixed(stepDecimalPlaces)
- }));
- }
- },
- getCircumference: function() {
- return ((Math.PI * 2) / this.valuesCount);
- },
- setScaleSize: function() {
- /*
- * Right, this is really confusing and there is a lot of maths going on here
- * The gist of the problem is here: https://gist.github.com/nnnick/696cc9c55f4b0beb8fe9
- *
- * Reaction: https://dl.dropboxusercontent.com/u/34601363/toomuchscience.gif
- *
- * Solution:
- *
- * We assume the radius of the polygon is half the size of the canvas at first
- * at each index we check if the text overlaps.
- *
- * Where it does, we store that angle and that index.
- *
- * After finding the largest index and angle we calculate how much we need to remove
- * from the shape radius to move the point inwards by that x.
- *
- * We average the left and right distances to get the maximum shape radius that can fit in the box
- * along with labels.
- *
- * Once we have that, we can find the centre point for the chart, by taking the x text protrusion
- * on each side, removing that from the size, halving it and adding the left x protrusion width.
- *
- * This will mean we have a shape fitted to the canvas, as large as it can be with the labels
- * and position it in the most space efficient manner
- *
- * https://dl.dropboxusercontent.com/u/34601363/yeahscience.gif
- */
-
-
- // Get maximum radius of the polygon. Either half the height (minus the text width) or half the width.
- // Use this to calculate the offset + change. - Make sure L/R protrusion is at least 0 to stop issues with centre points
- var largestPossibleRadius = min([(this.height / 2 - this.pointLabelFontSize - 5), this.width / 2]),
- pointPosition,
- i,
- textWidth,
- halfTextWidth,
- furthestRight = this.width,
- furthestRightIndex,
- furthestRightAngle,
- furthestLeft = 0,
- furthestLeftIndex,
- furthestLeftAngle,
- xProtrusionLeft,
- xProtrusionRight,
- radiusReductionRight,
- radiusReductionLeft,
- maxWidthRadius;
- this.ctx.font = fontString(this.pointLabelFontSize, this.pointLabelFontStyle, this.pointLabelFontFamily);
- for (i = 0; i < this.valuesCount; i++) {
- // 5px to space the text slightly out - similar to what we do in the draw function.
- pointPosition = this.getPointPosition(i, largestPossibleRadius);
- textWidth = this.ctx.measureText(template(this.templateString, {
- value: this.labels[i]
- })).width + 5;
- if (i === 0 || i === this.valuesCount / 2) {
- // If we're at index zero, or exactly the middle, we're at exactly the top/bottom
- // of the radar chart, so text will be aligned centrally, so we'll half it and compare
- // w/left and right text sizes
- halfTextWidth = textWidth / 2;
- if (pointPosition.x + halfTextWidth > furthestRight) {
- furthestRight = pointPosition.x + halfTextWidth;
- furthestRightIndex = i;
- }
- if (pointPosition.x - halfTextWidth < furthestLeft) {
- furthestLeft = pointPosition.x - halfTextWidth;
- furthestLeftIndex = i;
- }
- } else if (i < this.valuesCount / 2) {
- // Less than half the values means we'll left align the text
- if (pointPosition.x + textWidth > furthestRight) {
- furthestRight = pointPosition.x + textWidth;
- furthestRightIndex = i;
- }
- } else if (i > this.valuesCount / 2) {
- // More than half the values means we'll right align the text
- if (pointPosition.x - textWidth < furthestLeft) {
- furthestLeft = pointPosition.x - textWidth;
- furthestLeftIndex = i;
- }
- }
- }
-
- xProtrusionLeft = furthestLeft;
-
- xProtrusionRight = Math.ceil(furthestRight - this.width);
-
- furthestRightAngle = this.getIndexAngle(furthestRightIndex);
-
- furthestLeftAngle = this.getIndexAngle(furthestLeftIndex);
-
- radiusReductionRight = xProtrusionRight / Math.sin(furthestRightAngle + Math.PI / 2);
-
- radiusReductionLeft = xProtrusionLeft / Math.sin(furthestLeftAngle + Math.PI / 2);
-
- // Ensure we actually need to reduce the size of the chart
- radiusReductionRight = (isNumber(radiusReductionRight)) ? radiusReductionRight : 0;
- radiusReductionLeft = (isNumber(radiusReductionLeft)) ? radiusReductionLeft : 0;
-
- this.drawingArea = largestPossibleRadius - (radiusReductionLeft + radiusReductionRight) / 2;
-
- //this.drawingArea = min([maxWidthRadius, (this.height - (2 * (this.pointLabelFontSize + 5)))/2])
- this.setCenterPoint(radiusReductionLeft, radiusReductionRight);
-
- },
- setCenterPoint: function(leftMovement, rightMovement) {
-
- var maxRight = this.width - rightMovement - this.drawingArea,
- maxLeft = leftMovement + this.drawingArea;
-
- this.xCenter = (maxLeft + maxRight) / 2;
- // Always vertically in the centre as the text height doesn't change
- this.yCenter = (this.height / 2);
- },
-
- getIndexAngle: function(index) {
- var angleMultiplier = (Math.PI * 2) / this.valuesCount;
- // Start from the top instead of right, so remove a quarter of the circle
-
- return index * angleMultiplier - (Math.PI / 2);
- },
- getPointPosition: function(index, distanceFromCenter) {
- var thisAngle = this.getIndexAngle(index);
- return {
- x: (Math.cos(thisAngle) * distanceFromCenter) + this.xCenter,
- y: (Math.sin(thisAngle) * distanceFromCenter) + this.yCenter
- };
- },
- draw: function() {
- if (this.display) {
- var ctx = this.ctx;
- each(this.yLabels, function(label, index) {
- // Don't draw a centre value
- if (index > 0) {
- var yCenterOffset = index * (this.drawingArea / this.steps),
- yHeight = this.yCenter - yCenterOffset,
- pointPosition;
-
- // Draw circular lines around the scale
- if (this.lineWidth > 0) {
- ctx.strokeStyle = this.lineColor;
- ctx.lineWidth = this.lineWidth;
-
- if (this.lineArc) {
- ctx.beginPath();
- ctx.arc(this.xCenter, this.yCenter, yCenterOffset, 0, Math.PI * 2);
- ctx.closePath();
- ctx.stroke();
- } else {
- ctx.beginPath();
- for (var i = 0; i < this.valuesCount; i++) {
- pointPosition = this.getPointPosition(i, this.calculateCenterOffset(this.min + (index * this.stepValue)));
- if (i === 0) {
- ctx.moveTo(pointPosition.x, pointPosition.y);
- } else {
- ctx.lineTo(pointPosition.x, pointPosition.y);
- }
- }
- ctx.closePath();
- ctx.stroke();
- }
- }
- if (this.showLabels) {
- ctx.font = fontString(this.fontSize, this._fontStyle, this._fontFamily);
- if (this.showLabelBackdrop) {
- var labelWidth = ctx.measureText(label).width;
- ctx.fillStyle = this.backdropColor;
- ctx.fillRect(
- this.xCenter - labelWidth / 2 - this.backdropPaddingX,
- yHeight - this.fontSize / 2 - this.backdropPaddingY,
- labelWidth + this.backdropPaddingX * 2,
- this.fontSize + this.backdropPaddingY * 2
- );
- }
- ctx.textAlign = 'center';
- ctx.textBaseline = "middle";
- ctx.fillStyle = this.fontColor;
- ctx.fillText(label, this.xCenter, yHeight);
- }
- }
- }, this);
-
- if (!this.lineArc) {
- ctx.lineWidth = this.angleLineWidth;
- ctx.strokeStyle = this.angleLineColor;
- for (var i = this.valuesCount - 1; i >= 0; i--) {
- if (this.angleLineWidth > 0) {
- var outerPosition = this.getPointPosition(i, this.calculateCenterOffset(this.max));
- ctx.beginPath();
- ctx.moveTo(this.xCenter, this.yCenter);
- ctx.lineTo(outerPosition.x, outerPosition.y);
- ctx.stroke();
- ctx.closePath();
- }
- // Extra 3px out for some label spacing
- var pointLabelPosition = this.getPointPosition(i, this.calculateCenterOffset(this.max) + 5);
- ctx.font = fontString(this.pointLabelFontSize, this.pointLabelFontStyle, this.pointLabelFontFamily);
- ctx.fillStyle = this.pointLabelFontColor;
-
- var labelsCount = this.labels.length,
- halfLabelsCount = this.labels.length / 2,
- quarterLabelsCount = halfLabelsCount / 2,
- upperHalf = (i < quarterLabelsCount || i > labelsCount - quarterLabelsCount),
- exactQuarter = (i === quarterLabelsCount || i === labelsCount - quarterLabelsCount);
- if (i === 0) {
- ctx.textAlign = 'center';
- } else if (i === halfLabelsCount) {
- ctx.textAlign = 'center';
- } else if (i < halfLabelsCount) {
- ctx.textAlign = 'left';
- } else {
- ctx.textAlign = 'right';
- }
-
- // Set the correct text baseline based on outer positioning
- if (exactQuarter) {
- ctx.textBaseline = 'middle';
- } else if (upperHalf) {
- ctx.textBaseline = 'bottom';
- } else {
- ctx.textBaseline = 'top';
- }
-
- ctx.fillText(this.labels[i], pointLabelPosition.x, pointLabelPosition.y);
- }
- }
- }
- }
- });
-
Chart.animationService = {
frameDuration: 17,
animations: [],
helpers = Chart.helpers;
var defaultConfig = {
- //Boolean - Show a backdrop to the scale label
- scaleShowLabelBackdrop : true,
-
- //String - The colour of the label backdrop
- scaleBackdropColor : "rgba(255,255,255,0.75)",
-
- // Boolean - Whether the scale should begin at zero
- scaleBeginAtZero : true,
-
- //Number - The backdrop padding above & below the label in pixels
- scaleBackdropPaddingY : 2,
-
- //Number - The backdrop padding to the side of the label in pixels
- scaleBackdropPaddingX : 2,
-
- //Boolean - Show line for each value in the scale
- scaleShowLine : true,
-
//Boolean - Stroke a line around each segment in the chart
segmentShowStroke : true,
//Number - The width of the stroke value in pixels
segmentStrokeWidth : 2,
+ scale: {
+ scaleType: "radialLinear",
+ display: true,
+
+ //Boolean - Whether to animate scaling the chart from the centre
+ animate : false,
+
+ lineArc: true,
+
+ // grid line settings
+ gridLines: {
+ show: true,
+ color: "rgba(0, 0, 0, 0.05)",
+ lineWidth: 1,
+ },
+
+ // scale numbers
+ beginAtZero: true,
+
+ // label settings
+ labels: {
+ show: true,
+ template: "<%=value%>",
+ fontSize: 12,
+ fontStyle: "normal",
+ fontColor: "#666",
+ fontFamily: "Helvetica Neue",
+
+ //Boolean - Show a backdrop to the scale label
+ showLabelBackdrop : true,
+
+ //String - The colour of the label backdrop
+ backdropColor : "rgba(255,255,255,0.75)",
+
+ //Number - The backdrop padding above & below the label in pixels
+ backdropPaddingY : 2,
+
+ //Number - The backdrop padding to the side of the label in pixels
+ backdropPaddingX : 2,
+ }
+ },
+
//Number - Amount of animation steps
animationSteps : 100,
//Boolean - Whether to animate the rotation of the chart
animateRotate : true,
- //Boolean - Whether to animate scaling the chart from the centre
- animateScale : false,
-
//String - A legend template
legendTemplate : "<ul class=\"<%=name.toLowerCase()%>-legend\"><% for (var i=0; i<segments.length; i++){%><li><span style=\"background-color:<%=segments[i].fillColor%>\"></span><%if(segments[i].label){%><%=segments[i].label%><%}%></li><%}%></ul>"
};
x : this.chart.width/2,
y : this.chart.height/2
});
- this.scale = new Chart.RadialScale({
- display: this.options.showScale,
- fontStyle: this.options.scaleFontStyle,
- fontSize: this.options.scaleFontSize,
- fontFamily: this.options.scaleFontFamily,
- fontColor: this.options.scaleFontColor,
- showLabels: this.options.scaleShowLabels,
- showLabelBackdrop: this.options.scaleShowLabelBackdrop,
- backdropColor: this.options.scaleBackdropColor,
- backdropPaddingY : this.options.scaleBackdropPaddingY,
- backdropPaddingX: this.options.scaleBackdropPaddingX,
- lineWidth: (this.options.scaleShowLine) ? this.options.scaleLineWidth : 0,
- lineColor: this.options.scaleLineColor,
+
+ var self = this;
+ var ScaleClass = Chart.scales.getScaleConstructor(this.options.scale.scaleType);
+ this.scale = new ScaleClass({
+ options: this.options.scale,
lineArc: true,
width: this.chart.width,
height: this.chart.height,
xCenter: this.chart.width/2,
yCenter: this.chart.height/2,
ctx : this.chart.ctx,
- templateString: this.options.scaleLabel,
- valuesCount: this.data.length
+ valuesCount: this.data.length,
+ calculateRange: function() {
+ this.min = null;
+ this.max = null;
+
+ helpers.each(self.data, function(data) {
+ if (this.min === null) {
+ this.min = data.value;
+ } else if (data.value < this.min) {
+ this.min = data.value;
+ }
+
+ if (this.max === null) {
+ this.max = data.value;
+ } else if (data.value > this.max) {
+ this.max = data.value;
+ }
+ }, this);
+ }
});
- this.updateScaleRange(this.data);
-
- this.scale.update();
+ this.updateScaleRange();
+ this.scale.calculateRange();
+ this.scale.generateTicks();
+ this.scale.buildYLabels();
helpers.each(this.data,function(segment,index){
this.addData(segment,index,true);
helpers.each(this.segments,function(segment){
segment.restore(["fillColor"]);
});
+
helpers.each(activeSegments,function(activeSegment){
activeSegment.fillColor = activeSegment.highlightColor;
});
+
this.showTooltip(activeSegments);
});
}
},
getSegmentsAtEvent : function(e){
var segmentsArray = [];
-
var location = helpers.getRelativePosition(e);
helpers.each(this.segments,function(segment){
if (segment.inRange(location.x,location.y)) segmentsArray.push(segment);
},this);
+
return segmentsArray;
},
addData : function(segment, atIndex, silent){
},this);
this.scale.valuesCount = this.segments.length;
},
- updateScaleRange: function(datapoints){
- var valuesArray = [];
- helpers.each(datapoints,function(segment){
- valuesArray.push(segment.value);
+ updateScaleRange: function(){
+ helpers.extend(this.scale, {
+ size: helpers.min([this.chart.width, this.chart.height]),
+ xCenter: this.chart.width/2,
+ yCenter: this.chart.height/2
});
- var scaleSizes = (this.options.scaleOverride) ?
- {
- steps: this.options.scaleSteps,
- stepValue: this.options.scaleStepWidth,
- min: this.options.scaleStartValue,
- max: this.options.scaleStartValue + (this.options.scaleSteps * this.options.scaleStepWidth)
- } :
- helpers.calculateScaleRange(
- valuesArray,
- helpers.min([this.chart.width, this.chart.height])/2,
- this.options.scaleFontSize,
- this.options.scaleBeginAtZero,
- this.options.scaleIntegersOnly
- );
-
- helpers.extend(
- this.scale,
- scaleSizes,
- {
- size: helpers.min([this.chart.width, this.chart.height]),
- xCenter: this.chart.width/2,
- yCenter: this.chart.height/2
- }
- );
-
},
update : function(){
x : this.chart.width/2,
y : this.chart.height/2
});
- this.updateScaleRange(this.segments);
- this.scale.update();
+
+ this.updateScaleRange();
+ this.scale.calculateRange();
+ this.scale.generateTicks();
+ this.scale.buildYLabels();
helpers.extend(this.scale,{
xCenter: this.chart.width/2,
});
helpers.each(this.segments, function(segment){
- segment.update({
- outerRadius : this.scale.calculateCenterOffset(segment.value)
+ //segment.update({
+ // outerRadius : this.scale.calculateCenterOffset(segment.value)
+ //});
+ helpers.extend(segment, {
+ outerRadius: this.scale.calculateCenterOffset(segment.value)
});
}, this);
Chart.Type.extend({
name: "Radar",
defaults:{
- //Boolean - Whether to show lines for each scale point
- scaleShowLine : true,
- //Boolean - Whether we show the angle lines out of the radar
- angleShowLineOut : true,
-
- //Boolean - Whether to show labels on the scale
- scaleShowLabels : false,
-
- // Boolean - Whether the scale should begin at zero
- scaleBeginAtZero : true,
-
- //String - Colour of the angle line
- angleLineColor : "rgba(0,0,0,.1)",
-
- //Number - Pixel width of the angle line
- angleLineWidth : 1,
-
- //String - Point label font declaration
- pointLabelFontFamily : "'Arial'",
-
- //String - Point label font weight
- pointLabelFontStyle : "normal",
-
- //Number - Point label font size in pixels
- pointLabelFontSize : 10,
-
- //String - Point label font colour
- pointLabelFontColor : "#666",
+ scale: {
+ scaleType: "radialLinear",
+ display: true,
+
+ //Boolean - Whether to animate scaling the chart from the centre
+ animate : false,
+
+ lineArc: false,
+
+ // grid line settings
+ gridLines: {
+ show: true,
+ color: "rgba(0, 0, 0, 0.05)",
+ lineWidth: 1,
+ },
+
+ angleLines: {
+ show: true,
+ color: "rgba(0,0,0,.1)",
+ lineWidth: 1
+ },
+
+ // scale numbers
+ beginAtZero: true,
+
+ // label settings
+ labels: {
+ show: true,
+ template: "<%=value%>",
+ fontSize: 12,
+ fontStyle: "normal",
+ fontColor: "#666",
+ fontFamily: "Helvetica Neue",
+
+ //Boolean - Show a backdrop to the scale label
+ showLabelBackdrop : true,
+
+ //String - The colour of the label backdrop
+ backdropColor : "rgba(255,255,255,0.75)",
+
+ //Number - The backdrop padding above & below the label in pixels
+ backdropPaddingY : 2,
+
+ //Number - The backdrop padding to the side of the label in pixels
+ backdropPaddingX : 2,
+ },
+
+ pointLabels: {
+ //String - Point label font declaration
+ fontFamily : "'Arial'",
+
+ //String - Point label font weight
+ fontStyle : "normal",
+
+ //Number - Point label font size in pixels
+ fontSize : 10,
+
+ //String - Point label font colour
+ fontColor : "#666",
+ },
+ },
//Boolean - Whether to show a dot for each point
pointDot : true,
//Number - Radius of each point dot in pixels
- pointDotRadius : 3,
+ pointRadius: 3,
+
+ //Number - Pixel width of point dot border
+ pointBorderWidth: 1,
+
+ //Number - Pixel width of point on hover
+ pointHoverRadius: 5,
- //Number - Pixel width of point dot stroke
- pointDotStrokeWidth : 1,
+ //Number - Pixel width of point dot border on hover
+ pointHoverBorderWidth: 2,
+ pointBackgroundColor: Chart.defaults.global.defaultColor,
+ pointBorderColor: Chart.defaults.global.defaultColor,
- //Number - amount extra to add to the radius to cater for hit detection outside the drawn point
- pointHitDetectionRadius : 20,
+ //Number - amount extra to add to the radius to cater for hit detection outside the drawn point
+ pointHitRadius: 20,
//Boolean - Whether to show a stroke for datasets
datasetStroke : true,
initialize: function(){
this.PointClass = Chart.Point.extend({
- strokeWidth : this.options.pointDotStrokeWidth,
- radius : this.options.pointDotRadius,
display: this.options.pointDot,
- hitDetectionRadius : this.options.pointHitDetectionRadius,
- ctx : this.chart.ctx
+ _chart: this.chart
});
this.datasets = [];
strokeColor : dataset.pointStrokeColor,
fillColor : dataset.pointColor,
highlightFill : dataset.pointHighlightFill || dataset.pointColor,
- highlightStroke : dataset.pointHighlightStroke || dataset.pointStrokeColor
+ highlightStroke : dataset.pointHighlightStroke || dataset.pointStrokeColor,
+
+ // Appearance
+ radius: dataset.pointRadius || this.options.pointRadius,
+ backgroundColor: dataset.pointBackgroundColor || this.options.pointBackgroundColor,
+ borderWidth: dataset.pointBorderWidth || this.options.pointBorderWidth,
+
+ // Tooltip
+ hoverRadius: dataset.pointHitRadius || this.options.pointHitRadius,
}));
},this);
},
buildScale : function(data){
- this.scale = new Chart.RadialScale({
- display: this.options.showScale,
- fontStyle: this.options.scaleFontStyle,
- fontSize: this.options.scaleFontSize,
- fontFamily: this.options.scaleFontFamily,
- fontColor: this.options.scaleFontColor,
- showLabels: this.options.scaleShowLabels,
- showLabelBackdrop: this.options.scaleShowLabelBackdrop,
- backdropColor: this.options.scaleBackdropColor,
- backdropPaddingY : this.options.scaleBackdropPaddingY,
- backdropPaddingX: this.options.scaleBackdropPaddingX,
- lineWidth: (this.options.scaleShowLine) ? this.options.scaleLineWidth : 0,
- lineColor: this.options.scaleLineColor,
- angleLineColor : this.options.angleLineColor,
- angleLineWidth : (this.options.angleShowLineOut) ? this.options.angleLineWidth : 0,
- // Point labels at the edge of each line
- pointLabelFontColor : this.options.pointLabelFontColor,
- pointLabelFontSize : this.options.pointLabelFontSize,
- pointLabelFontFamily : this.options.pointLabelFontFamily,
- pointLabelFontStyle : this.options.pointLabelFontStyle,
+ var self = this;
+
+ var ScaleConstructor = Chart.scales.getScaleConstructor(this.options.scale.scaleType);
+ this.scale = new ScaleConstructor({
+ options: this.options.scale,
height : this.chart.height,
width: this.chart.width,
xCenter: this.chart.width/2,
yCenter: this.chart.height/2,
ctx : this.chart.ctx,
- templateString: this.options.scaleLabel,
labels: data.labels,
- valuesCount: data.datasets[0].data.length
+ valuesCount: data.datasets[0].data.length,
+ calculateRange: function() {
+ this.min = null;
+ this.max = null;
+
+ helpers.each(self.data.datasets, function(dataset) {
+ if (dataset.yAxisID === this.id) {
+ helpers.each(dataset.data, function(value, index) {
+ if (this.min === null) {
+ this.min = value;
+ } else if (value < this.min) {
+ this.min = value;
+ }
+
+ if (this.max === null) {
+ this.max = value;
+ } else if (value > this.max) {
+ this.max = value;
+ }
+ }, this);
+ }
+ }, this);
+ }
});
this.scale.setScaleSize();
- this.updateScaleRange(data.datasets);
+ this.scale.calculateRange();
+ this.scale.generateTicks();
this.scale.buildYLabels();
},
- updateScaleRange: function(datasets){
- var valuesArray = (function(){
- var totalDataArray = [];
- helpers.each(datasets,function(dataset){
- if (dataset.data){
- totalDataArray = totalDataArray.concat(dataset.data);
- }
- else {
- helpers.each(dataset.points, function(point){
- totalDataArray.push(point.value);
- });
- }
- });
- return totalDataArray;
- })();
-
-
- var scaleSizes = (this.options.scaleOverride) ?
- {
- steps: this.options.scaleSteps,
- stepValue: this.options.scaleStepWidth,
- min: this.options.scaleStartValue,
- max: this.options.scaleStartValue + (this.options.scaleSteps * this.options.scaleStepWidth)
- } :
- helpers.calculateScaleRange(
- valuesArray,
- helpers.min([this.chart.width, this.chart.height])/2,
- this.options.scaleFontSize,
- this.options.scaleBeginAtZero,
- this.options.scaleIntegersOnly
- );
-
- helpers.extend(
- this.scale,
- scaleSizes
- );
-
- },
addData : function(valuesArray,label){
//Map the values array for each of the datasets
this.scale.valuesCount++;
xCenter: this.chart.width/2,
yCenter: this.chart.height/2
});
- this.updateScaleRange(this.datasets);
- this.scale.setScaleSize();
+
+ this.scale.calculateRange();
+ this.scale.generateTicks();
this.scale.buildYLabels();
},
draw : function(ease){
//Transition each point first so that the line and point drawing isn't out of sync
helpers.each(dataset.points,function(point,index){
if (point.hasValue()){
- point.transition(this.scale.getPointPosition(index, this.scale.calculateCenterOffset(point.value)), easeDecimal);
+ point.transition(easeDecimal);
}
},this);
helpers.each(this.ticks, function(tick, index, ticks) {
var label;
- if (this.options.labelCallback) {
+ if (this.options.labels.userCallback) {
// If the user provided a callback for label generation, use that as first priority
- label = this.options.labelCallback(tick, index, ticks);
+ label = this.options.lables.userCallback(tick, index, ticks);
} else if (this.options.labels.template) {
// else fall back to the template string
label = helpers.template(this.options.labels.template, {
}
});
Chart.scales.registerScaleType("dataset", DatasetScale);
+
+ var LinearRadialScale = Chart.Element.extend({
+ initialize: function() {
+ this.size = helpers.min([this.height, this.width]);
+ this.drawingArea = (this.options.display) ? (this.size / 2) - (this.options.labels.fontSize / 2 + this.options.labels.backdropPaddingY) : (this.size / 2);
+ },
+ calculateCenterOffset: function(value) {
+ // Take into account half font size + the yPadding of the top value
+ var scalingFactor = this.drawingArea / (this.max - this.min);
+ return (value - this.min) * scalingFactor;
+ },
+ update: function() {
+ if (!this.options.lineArc) {
+ this.setScaleSize();
+ } else {
+ this.drawingArea = (this.options.display) ? (this.size / 2) - (this.fontSize / 2 + this.backdropPaddingY) : (this.size / 2);
+ }
+
+ this.buildYLabels();
+ },
+ calculateRange: helpers.noop, // overridden in chart
+ generateTicks: function() {
+ // We need to decide how many ticks we are going to have. Each tick draws a grid line.
+ // There are two possibilities. The first is that the user has manually overridden the scale
+ // calculations in which case the job is easy. The other case is that we have to do it ourselves
+ //
+ // We assume at this point that the scale object has been updated with the following values
+ // by the chart.
+ // min: this is the minimum value of the scale
+ // max: this is the maximum value of the scale
+ // options: contains the options for the scale. This is referenced from the user settings
+ // rather than being cloned. This ensures that updates always propogate to a redraw
+
+ // Reset the ticks array. Later on, we will draw a grid line at these positions
+ // The array simply contains the numerical value of the spots where ticks will be
+ this.ticks = [];
+
+ if (this.options.override) {
+ // The user has specified the manual override. We use <= instead of < so that
+ // we get the final line
+ for (var i = 0; i <= this.options.override.steps; ++i) {
+ var value = this.options.override.start + (i * this.options.override.stepWidth);
+ ticks.push(value);
+ }
+ }
+ else {
+ // Figure out what the max number of ticks we can support it is based on the size of
+ // the axis area. For now, we say that the minimum tick spacing in pixels must be 50
+ // We also limit the maximum number of ticks to 11 which gives a nice 10 squares on
+ // the graph
+
+ var maxTicks = Math.min(11, Math.ceil(this.drawingArea / (2 * this.options.labels.fontSize)));
+
+ // Make sure we always have at least 2 ticks
+ maxTicks = Math.max(2, maxTicks);
+
+ // To get a "nice" value for the tick spacing, we will use the appropriately named
+ // "nice number" algorithm. See http://stackoverflow.com/questions/8506881/nice-label-algorithm-for-charts-with-minimum-ticks
+ // for details.
+
+ // If we are forcing it to begin at 0, but 0 will already be rendered on the chart,
+ // do nothing since that would make the chart weird. If the user really wants a weird chart
+ // axis, they can manually override it
+ if (this.options.beginAtZero) {
+ var minSign = helpers.sign(this.min);
+ var maxSign = helpers.sign(this.max);
+
+ if (minSign < 0 && maxSign < 0) {
+ // move the top up to 0
+ this.max = 0;
+ } else if (minSign > 0 && maxSign > 0) {
+ // move the botttom down to 0
+ this.min = 0;
+ }
+ }
+
+ var niceRange = helpers.niceNum(this.max - this.min, false);
+ var spacing = helpers.niceNum(niceRange / (maxTicks - 1), true);
+ var niceMin = Math.floor(this.min / spacing) * spacing;
+ var niceMax = Math.ceil(this.max / spacing) * spacing;
+
+ // Put the values into the ticks array
+ for (var j = niceMin; j <= niceMax; j += spacing) {
+ this.ticks.push(j);
+ }
+ }
+
+ if (this.options.position == "left" || this.options.position == "right") {
+ // We are in a vertical orientation. The top value is the highest. So reverse the array
+ this.ticks.reverse();
+ }
+
+ // At this point, we need to update our max and min given the tick values since we have expanded the
+ // range of the scale
+ this.max = helpers.max(this.ticks);
+ this.min = helpers.min(this.ticks);
+ },
+ buildYLabels: function() {
+ this.yLabels = [];
+
+ helpers.each(this.ticks, function(tick, index, ticks) {
+ var label;
+
+ if (this.options.labels.userCallback) {
+ // If the user provided a callback for label generation, use that as first priority
+ label = this.options.labels.userCallback(tick, index, ticks);
+ } else if (this.options.labels.template) {
+ // else fall back to the template string
+ label = helpers.template(this.options.labels.template, {
+ value: tick
+ });
+ }
+
+ this.yLabels.push(label ? label : "");
+ }, this);
+ },
+ getCircumference: function() {
+ return ((Math.PI * 2) / this.valuesCount);
+ },
+ setScaleSize: function() {
+ /*
+ * Right, this is really confusing and there is a lot of maths going on here
+ * The gist of the problem is here: https://gist.github.com/nnnick/696cc9c55f4b0beb8fe9
+ *
+ * Reaction: https://dl.dropboxusercontent.com/u/34601363/toomuchscience.gif
+ *
+ * Solution:
+ *
+ * We assume the radius of the polygon is half the size of the canvas at first
+ * at each index we check if the text overlaps.
+ *
+ * Where it does, we store that angle and that index.
+ *
+ * After finding the largest index and angle we calculate how much we need to remove
+ * from the shape radius to move the point inwards by that x.
+ *
+ * We average the left and right distances to get the maximum shape radius that can fit in the box
+ * along with labels.
+ *
+ * Once we have that, we can find the centre point for the chart, by taking the x text protrusion
+ * on each side, removing that from the size, halving it and adding the left x protrusion width.
+ *
+ * This will mean we have a shape fitted to the canvas, as large as it can be with the labels
+ * and position it in the most space efficient manner
+ *
+ * https://dl.dropboxusercontent.com/u/34601363/yeahscience.gif
+ */
+
+
+ // Get maximum radius of the polygon. Either half the height (minus the text width) or half the width.
+ // Use this to calculate the offset + change. - Make sure L/R protrusion is at least 0 to stop issues with centre points
+ var largestPossibleRadius = helpers.min([(this.height / 2 - this.options.pointLabels.fontSize - 5), this.width / 2]),
+ pointPosition,
+ i,
+ textWidth,
+ halfTextWidth,
+ furthestRight = this.width,
+ furthestRightIndex,
+ furthestRightAngle,
+ furthestLeft = 0,
+ furthestLeftIndex,
+ furthestLeftAngle,
+ xProtrusionLeft,
+ xProtrusionRight,
+ radiusReductionRight,
+ radiusReductionLeft,
+ maxWidthRadius;
+ this.ctx.font = helpers.fontString(this.options.pointLabels.fontSize, this.options.pointLabels.fontStyle, this.options.pointLabels.fontFamily);
+ for (i = 0; i < this.valuesCount; i++) {
+ // 5px to space the text slightly out - similar to what we do in the draw function.
+ pointPosition = this.getPointPosition(i, largestPossibleRadius);
+ textWidth = this.ctx.measureText(helpers.template(this.options.labels.template, {
+ value: this.labels[i]
+ })).width + 5;
+ if (i === 0 || i === this.valuesCount / 2) {
+ // If we're at index zero, or exactly the middle, we're at exactly the top/bottom
+ // of the radar chart, so text will be aligned centrally, so we'll half it and compare
+ // w/left and right text sizes
+ halfTextWidth = textWidth / 2;
+ if (pointPosition.x + halfTextWidth > furthestRight) {
+ furthestRight = pointPosition.x + halfTextWidth;
+ furthestRightIndex = i;
+ }
+ if (pointPosition.x - halfTextWidth < furthestLeft) {
+ furthestLeft = pointPosition.x - halfTextWidth;
+ furthestLeftIndex = i;
+ }
+ } else if (i < this.valuesCount / 2) {
+ // Less than half the values means we'll left align the text
+ if (pointPosition.x + textWidth > furthestRight) {
+ furthestRight = pointPosition.x + textWidth;
+ furthestRightIndex = i;
+ }
+ } else if (i > this.valuesCount / 2) {
+ // More than half the values means we'll right align the text
+ if (pointPosition.x - textWidth < furthestLeft) {
+ furthestLeft = pointPosition.x - textWidth;
+ furthestLeftIndex = i;
+ }
+ }
+ }
+
+ xProtrusionLeft = furthestLeft;
+
+ xProtrusionRight = Math.ceil(furthestRight - this.width);
+
+ furthestRightAngle = this.getIndexAngle(furthestRightIndex);
+
+ furthestLeftAngle = this.getIndexAngle(furthestLeftIndex);
+
+ radiusReductionRight = xProtrusionRight / Math.sin(furthestRightAngle + Math.PI / 2);
+
+ radiusReductionLeft = xProtrusionLeft / Math.sin(furthestLeftAngle + Math.PI / 2);
+
+ // Ensure we actually need to reduce the size of the chart
+ radiusReductionRight = (helpers.isNumber(radiusReductionRight)) ? radiusReductionRight : 0;
+ radiusReductionLeft = (helpers.isNumber(radiusReductionLeft)) ? radiusReductionLeft : 0;
+
+ this.drawingArea = largestPossibleRadius - (radiusReductionLeft + radiusReductionRight) / 2;
+
+ //this.drawingArea = min([maxWidthRadius, (this.height - (2 * (this.pointLabelFontSize + 5)))/2])
+ this.setCenterPoint(radiusReductionLeft, radiusReductionRight);
+
+ },
+ setCenterPoint: function(leftMovement, rightMovement) {
+
+ var maxRight = this.width - rightMovement - this.drawingArea,
+ maxLeft = leftMovement + this.drawingArea;
+
+ this.xCenter = (maxLeft + maxRight) / 2;
+ // Always vertically in the centre as the text height doesn't change
+ this.yCenter = (this.height / 2);
+ },
+
+ getIndexAngle: function(index) {
+ var angleMultiplier = (Math.PI * 2) / this.valuesCount;
+ // Start from the top instead of right, so remove a quarter of the circle
+
+ return index * angleMultiplier - (Math.PI / 2);
+ },
+ getPointPosition: function(index, distanceFromCenter) {
+ var thisAngle = this.getIndexAngle(index);
+ return {
+ x: (Math.cos(thisAngle) * distanceFromCenter) + this.xCenter,
+ y: (Math.sin(thisAngle) * distanceFromCenter) + this.yCenter
+ };
+ },
+ draw: function() {
+ if (this.options.display) {
+ var ctx = this.ctx;
+ helpers.each(this.yLabels, function(label, index) {
+ // Don't draw a centre value
+ if (index > 0) {
+ var yCenterOffset = index * (this.drawingArea / Math.max(this.ticks.length, 1)),
+ yHeight = this.yCenter - yCenterOffset,
+ pointPosition;
+
+ // Draw circular lines around the scale
+ if (this.options.gridLines.show) {
+ ctx.strokeStyle = this.options.gridLines.color;
+ ctx.lineWidth = this.options.gridLines.lineWidth;
+
+ if (this.options.lineArc) {
+ ctx.beginPath();
+ ctx.arc(this.xCenter, this.yCenter, yCenterOffset, 0, Math.PI * 2);
+ ctx.closePath();
+ ctx.stroke();
+ } else {
+ ctx.beginPath();
+ for (var i = 0; i < this.valuesCount; i++) {
+ pointPosition = this.getPointPosition(i, this.calculateCenterOffset(this.ticks[index]));
+ if (i === 0) {
+ ctx.moveTo(pointPosition.x, pointPosition.y);
+ } else {
+ ctx.lineTo(pointPosition.x, pointPosition.y);
+ }
+ }
+ ctx.closePath();
+ ctx.stroke();
+ }
+ }
+
+ if (this.options.labels.show) {
+ ctx.font = helpers.fontString(this.options.labels.fontSize, this.options.labels.fontStyle, this.options.labels.fontFamily);
+
+ if (this.showLabelBackdrop) {
+ var labelWidth = ctx.measureText(label).width;
+ ctx.fillStyle = this.options.labels.backdropColor;
+ ctx.fillRect(
+ this.xCenter - labelWidth / 2 - this.options.labels.backdropPaddingX,
+ yHeight - this.fontSize / 2 - this.options.labels.backdropPaddingY,
+ labelWidth + this.options.labels.backdropPaddingX * 2,
+ this.options.labels.fontSize + this.options.lables.backdropPaddingY * 2
+ );
+ }
+
+ ctx.textAlign = 'center';
+ ctx.textBaseline = "middle";
+ ctx.fillStyle = this.options.labels.fontColor;
+ ctx.fillText(label, this.xCenter, yHeight);
+ }
+ }
+ }, this);
+
+ if (!this.options.lineArc) {
+ ctx.lineWidth = this.options.angleLines.lineWidth;
+ ctx.strokeStyle = this.options.angleLines.color;
+
+ for (var i = this.valuesCount - 1; i >= 0; i--) {
+ if (this.options.angleLines.show) {
+ var outerPosition = this.getPointPosition(i, this.calculateCenterOffset(this.max));
+ ctx.beginPath();
+ ctx.moveTo(this.xCenter, this.yCenter);
+ ctx.lineTo(outerPosition.x, outerPosition.y);
+ ctx.stroke();
+ ctx.closePath();
+ }
+ // Extra 3px out for some label spacing
+ var pointLabelPosition = this.getPointPosition(i, this.calculateCenterOffset(this.max) + 5);
+ ctx.font = helpers.fontString(this.options.pointLabels.fontSize, this.options.pointLabels.fontStyle, this.options.pointLabels.fontFamily);
+ ctx.fillStyle = this.options.pointLabels.fontColor;
+
+ var labelsCount = this.labels.length,
+ halfLabelsCount = this.labels.length / 2,
+ quarterLabelsCount = halfLabelsCount / 2,
+ upperHalf = (i < quarterLabelsCount || i > labelsCount - quarterLabelsCount),
+ exactQuarter = (i === quarterLabelsCount || i === labelsCount - quarterLabelsCount);
+ if (i === 0) {
+ ctx.textAlign = 'center';
+ } else if (i === halfLabelsCount) {
+ ctx.textAlign = 'center';
+ } else if (i < halfLabelsCount) {
+ ctx.textAlign = 'left';
+ } else {
+ ctx.textAlign = 'right';
+ }
+
+ // Set the correct text baseline based on outer positioning
+ if (exactQuarter) {
+ ctx.textBaseline = 'middle';
+ } else if (upperHalf) {
+ ctx.textBaseline = 'bottom';
+ } else {
+ ctx.textBaseline = 'top';
+ }
+
+ ctx.fillText(this.labels[i], pointLabelPosition.x, pointLabelPosition.y);
+ }
+ }
+ }
+ }
+ });
+ Chart.scales.registerScaleType("radialLinear", LinearRadialScale);
}).call(this);
\ No newline at end of file
projects / thirdparty / Chart.js.git / commitdiff
