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Added mouseover and mouseout support for Polar Area charts. #2

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Added mouseover and mouseout support for Polar Area charts. #2

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128 changes: 104 additions & 24 deletions Chart.js
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Original file line number Diff line number Diff line change
Expand Up @@ -352,18 +352,13 @@ window.Chart = function(context){
};

var PolarArea = function(data,config,ctx){
var maxSize, scaleHop, calculatedScale, labelHeight, scaleHeight, valueBounds, labelTemplateString;


var maxSize, scaleHop, calculatedScale, labelHeight, scaleHeight, valueBounds, labelTemplateString;
var dataAreas = [], hoveredArea;
calculateDrawingSizes();

valueBounds = getValueBounds();

labelTemplateString = (config.scaleShowLabels)? config.scaleLabel : null;

//Check and set the scale
// Check and set the scale
if (!config.scaleOverride){

calculatedScale = calculateScale(scaleHeight,valueBounds.maxSteps,valueBounds.minSteps,valueBounds.maxValue,valueBounds.minValue,labelTemplateString);
}
else {
Expand All @@ -375,25 +370,71 @@ window.Chart = function(context){
}
populateLabels(labelTemplateString, calculatedScale.labels,calculatedScale.steps,config.scaleStartValue,config.scaleStepWidth);
}

scaleHop = maxSize/(calculatedScale.steps);

//Wrap in an animation loop wrapper
// Wrap in an animation loop wrapper
animationLoop(config,drawScale,drawAllSegments,ctx);
// Set up mouse/touch events
if (is_touch_device()) {
context.canvas.ontouchstart = function(e) {
e.offsetX = e.targetTouches[0].clientX - position.x;
e.offsetY = e.targetTouches[0].clientY - position.y;
activeAreaHandler(e);
}
context.canvas.ontouchmove = function(e) {
e.offsetX = e.targetTouches[0].clientX - position.x;
e.offsetY = e.targetTouches[0].clientY - position.y;
activeAreaHandler(e);
}
} else {
context.canvas.onmousemove = function(e) {
activeAreaHandler(e);
}
}

function activeAreaHandler(event) {
var offsetX = event.hasOwnProperty('offsetX') ? event.offsetX : event.layerX;
var offsetY = event.hasOwnProperty('offsetY') ? event.offsetY : event.layerY;
var mouse_on_area = false;
for (var i in data) {
var dataArea = dataAreas[i];
if (data[dataArea.areaIndex].mouseover && isPointInSector(offsetX, offsetY, dataArea)) {
mouse_on_area = true;
if (hoveredArea != dataArea) {
if (hoveredArea) {
// We jumped from one area to the next, so fire the mouseout first for that area
if (data[hoveredArea.areaIndex].mouseout) {
data[hoveredArea.areaIndex].mouseout({event: event, area: dataArea});
}
}
hoveredArea = dataArea;
data[dataArea.areaIndex].mouseover({event: event, area: dataArea});
}
break;
}
}
if (!mouse_on_area && hoveredArea) {
if (data[hoveredArea.areaIndex].mouseout) {
data[hoveredArea.areaIndex].mouseout({event: event, area: dataArea});
}
hoveredArea = null;
}
if (mouse_on_area) {
context.canvas.style.cursor = 'pointer';
} else {
context.canvas.style.cursor = 'default';
}
}

function calculateDrawingSizes(){
maxSize = (Min([width,height])/2);
//Remove whatever is larger - the font size or line width.

maxSize -= Max([config.scaleFontSize*0.5,config.scaleLineWidth*0.5]);

labelHeight = config.scaleFontSize*2;
//If we're drawing the backdrop - add the Y padding to the label height and remove from drawing region.
if (config.scaleShowLabelBackdrop){
labelHeight += (2 * config.scaleBackdropPaddingY);
maxSize -= config.scaleBackdropPaddingY*1.5;
}

scaleHeight = maxSize;
//If the label height is less than 5, set it to 5 so we don't have lines on top of each other.
labelHeight = Default(labelHeight,5);
Expand All @@ -408,7 +449,6 @@ window.Chart = function(context){
ctx.lineWidth = config.scaleLineWidth;
ctx.stroke();
}

if (config.scaleShowLabels){
ctx.textAlign = "center";
ctx.font = config.scaleFontStyle + " " + config.scaleFontSize + "px " + config.scaleFontFamily;
Expand All @@ -432,6 +472,7 @@ window.Chart = function(context){
}
}
}

function drawAllSegments(animationDecimal){
var startAngle = -Math.PI/2,
angleStep = (Math.PI*2)/data.length,
Expand All @@ -445,16 +486,32 @@ window.Chart = function(context){
rotateAnimation = animationDecimal;
}
}

for (var i=0; i<data.length; i++){

var area = {
centerPoint: {
x: width/2,
y: height/2
},
radius: scaleAnimation * calculateOffset(data[i].value, calculatedScale, scaleHop),
startAngle: startAngle,
endAngle: startAngle + rotateAnimation*angleStep,
areaIndex: i
};
area.startPoint = {
x: area.radius*Math.cos(area.startAngle) + area.centerPoint.x,
y: area.radius*Math.sin(area.startAngle) + area.centerPoint.y
};
area.endPoint = {
x: area.radius*Math.cos(area.endAngle) + area.centerPoint.x,
y: area.radius*Math.sin(area.endAngle) + area.centerPoint.y
};
dataAreas[area.areaIndex] = area;
ctx.beginPath();
ctx.arc(width/2,height/2,scaleAnimation * calculateOffset(data[i].value,calculatedScale,scaleHop),startAngle, startAngle + rotateAnimation*angleStep, false);
ctx.lineTo(width/2,height/2);
ctx.arc(area.centerPoint.x, area.centerPoint.y, area.radius, area.startAngle, area.endAngle, false);
ctx.lineTo(area.centerPoint.x, area.centerPoint.y);
ctx.closePath();
ctx.fillStyle = data[i].color;
ctx.fill();

if(config.segmentShowStroke){
ctx.strokeStyle = config.segmentStrokeColor;
ctx.lineWidth = config.segmentStrokeWidth;
Expand All @@ -463,25 +520,48 @@ window.Chart = function(context){
startAngle += rotateAnimation*angleStep;
}
}

function getValueBounds() {
var upperValue = Number.MIN_VALUE;
var lowerValue = Number.MAX_VALUE;
for (var i=0; i<data.length; i++){
if (data[i].value > upperValue) {upperValue = data[i].value;}
if (data[i].value < lowerValue) {lowerValue = data[i].value;}
};

var maxSteps = Math.floor((scaleHeight / (labelHeight*0.66)));
var minSteps = Math.floor((scaleHeight / labelHeight*0.5));

return {
maxValue : upperValue,
minValue : lowerValue,
maxSteps : maxSteps,
minSteps : minSteps
};

}

function isPointInSector(x, y, areaData) {
var topV = {
x: areaData.startPoint.x - areaData.centerPoint.x,
y: areaData.centerPoint.y - areaData.startPoint.y,
},
botV = {
x: areaData.endPoint.x - areaData.centerPoint.x,
y: areaData.centerPoint.y - areaData.endPoint.y,
},
relV = {
x: x - areaData.centerPoint.x,
y: areaData.centerPoint.y - y
};
return !areClockwise(botV, relV) &&
areClockwise(topV, relV) &&
isWithinRadius(relV, Math.pow(areaData.radius, 2));

function areClockwise(v1, v2) {
return -v1.x*v2.y + v1.y*v2.x > 0;
}

function isWithinRadius(v, radiusSquared) {
return v.x*v.x + v.y*v.y <= radiusSquared;
}
}
}

Expand Down Expand Up @@ -1516,4 +1596,4 @@ window.Chart = function(context){
return !!('ontouchstart' in window) // works on most browsers
|| !!('onmsgesturechange' in window); // works on ie10
};
}
}