Css - How To Create Circle Pie Canvas Like This?
Solution 1:
This effect can be achieved by layering a couple arc()s:
// bright blue full circle
d.beginPath();
d.arc(50, 50, 50, 0, 2 * Math.PI, false);
d.fillStyle = "#aaeeff";
d.fill();
// dark blue percentage circle
d.beginPath();
d.moveTo(50, 50);
d.arc(50, 50, 50, -0.5 * Math.PI, 0.78 * 2 * Math.PI - 0.5 * Math.PI, false);
d.fillStyle = "#00aaff";
d.fill();
// white inner filler
d.beginPath();
d.moveTo(50, 50);
d.arc(50, 50, 25, 0, 2 * Math.PI, false);
d.fillStyle = "#ffffff";
d.fill();
and finally rendering the text:
d.moveTo(50, 50);
d.fillStyle = "#606060";
d.font = "12pt sans-serif";
d.fillText("78%", 36, 56);
Fiddle: http://jsfiddle.net/j6NVg/
Solution 2:
Instead of using the <canvas> element, I have chosen to construct the pie chart relying on CSS and JS entirely. The HTML markup is as follow:
<divclass="pie"data-percent="78"><divclass="left"><span></span></div><divclass="right"><span></span></div></div>The CSS is as follow. The trick is to split the circle into two halves (the nested .left and .right elements). The halves will have their overflowing content hidden, and contain nested <span> that we will manipulate with JS for rotation later. Add vendor prefixes when appropriate :)
.pie {
background-color: #eee;
border-radius: 50%;
width: 200px;
height: 200px;
overflow: hidden;
position: relative;
}
.pie > div {
float: left;
width: 50%;
height: 100%;
position: relative;
overflow: hidden;
}
.piespan {
background-color: #4a7298;
display: block;
width: 100%;
height: 100%;
}
.pie.leftspan {
border-top-right-radius: 0;
border-bottom-right-radius: 0;
-webkit-transform-origin: 100%50%;
transform-origin: 100%50%;
}
.pie.rightspan {
border-top-left-radius: 0;
border-bottom-left-radius: 0;
-webkit-transform-origin: 0%50%;
transform-origin: 0%50%;
}
.pie:before,
.pie:after {
border-radius: 50%;
display: block;
position: absolute;
top: 50%;
left: 50%;
-webkit-transform: translateX(-50%) translateY(-50%);
transform: translateX(-50%) translateY(-50%);
}
.pie:before {
background-color: #fff;
content: "";
width: 75%;
height: 75%;
z-index: 100;
}
.pie:after {
content: attr(data-percent) "%";
z-index: 200;
text-align: center;
}
I have used the following with jQuery:
$(function() {
$(".pie").each(function() {
var percent = $(this).data("percent").slice(0,-1), // Removes '%'
$left = $(this).find(".left span"),
$right = $(this).find(".right span"),
deg;
if(percent<=50) {
// Hide left
$left.hide();
// Adjust right
deg = 180 - (percent/100*360)
$right.css({
"transform": "rotateZ(-"+deg+"deg)"
});
} else {
// Adjust left
deg = 180 - ((percent-50)/100*360)
$left.css({
"transform": "rotateZ(-"+deg+"deg)"
});
}
});
});
Here is the fiddle: http://jsfiddle.net/Aw5Rf/7/
Solution 3:
Check the below links for more info (not an exact one.But you can get some idea).
<!doctype html><html><head><metacharset="UTF-8" /><title>Canvas Test</title></head><body><section><div><canvasid="canvas"width="400"height="300">
This text is displayed if your browser does not support HTML5 Canvas.
</canvas></div><scripttype="text/javascript">var myColor = ["#ECD078","#D95B43","#C02942","#542437","#53777A"];
var myData = [10,30,20,60,40];
functiongetTotal(){
var myTotal = 0;
for (var j = 0; j < myData.length; j++) {
myTotal += (typeof myData[j] == 'number') ? myData[j] : 0;
}
return myTotal;
}
functionplotData() {
var canvas;
var ctx;
var lastend = 0;
var myTotal = getTotal();
canvas = document.getElementById("canvas");
ctx = canvas.getContext("2d");
ctx.clearRect(0, 0, canvas.width, canvas.height);
for (var i = 0; i < myData.length; i++) {
ctx.fillStyle = myColor[i];
ctx.beginPath();
ctx.moveTo(200,150);
ctx.arc(200,150,150,lastend,lastend+
(Math.PI*2*(myData[i]/myTotal)),false);
ctx.lineTo(200,150);
ctx.fill();
lastend += Math.PI*2*(myData[i]/myTotal);
}
}
plotData();
</script></section></body></html>For more info :Graphing Data in the HTML5 Canvas Element Simple Pie Charts
Another Link : Pure CSS3 Pie Charts effect
This is an online demo: http://jsbin.com/uFaSOwO/1/
Solution 4:
First of all what you need can be done exactly using jQuery knob plugin. Still interested in a CSS Solution, than here's what I have done
<divclass="load_me"></div>.load_me {
margin:100px;height:50px;width:50px;border:5pxsolid#f00;border-radius:50%;border-top-color:transparent;
}
If you want to prevent the mouse alteration, you can simply add readOnly
$this.knob({
readOnly: true
});
Solution 5:
Here's my approach:
var ctx = canvas.getContext('2d');
/*
* in canvas, 0 degrees angle is on the right edge of a circle,
* while we want to start at the top edge of the circle.
* We'll use this variable to compensate the difference.
*/var relativeAngle = 270;
functiondrawCanvas() {
ctx.clearRect(0, 0, 90, 90);
//light blue circle
ctx.lineWidth = 20;
ctx.strokeStyle = '#D8E8F7';
ctx.beginPath();
ctx.arc(45, 45, 35, 0, 2*Math.PI);
ctx.stroke();
//dark blue circle
ctx.strokeStyle = '#66ADF4';
ctx.beginPath();
//notice the angle conversion from degrees to radians in the 5th argument
ctx.arc(45, 45, 35, 1.5*Math.PI, ((angle + relativeAngle) / 180) * Math.PI);
ctx.stroke();
//text
ctx.textBaseline = 'middle';
ctx.textAlign = 'center';
ctx.fillStyle = '#666';
ctx.font = 'bold 14px serif';
// angle conversion to percentage value
ctx.fillText(parseInt(100 * angle / 360).toString() + '%', 45, 45);
}
var angle;
functiontimeout() {
angle = parseInt(360 * percent / 100);
drawCanvas();
if (angle > 360) {
document.getElementById('run').disabled = false;
percent = 0;
return;
}
percent++;
setTimeout(timeout, 10);
};
var percent = 0;
/* START the ANIMATION */timeout();
At the bottom of the code you'll find a self evaluating function timeout which calls the drawCanvas function every 10 miliseconds and increments the blue circle angle. I hope everything is clear here. If not, feel free to ask!
Enjoy it!
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