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index.html
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index.html
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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>HiDPI Canvas Example</title>
<style>
#canvas {
background-color: whiteSmoke;
}
</style>
</head>
<body>
<canvas id="canvas" height="600" width="600"></canvas>
<script src="dist/hidpi-canvas.js"></script>
<script>
(function() {
var canvas = document.getElementById('canvas'),
ctx = canvas.getContext('2d');
// Rectangle
ctx.beginPath();
ctx.fillRect(425,25,100,100);
ctx.clearRect(445,45,60,60);
ctx.strokeRect(440,50,50,50);
ctx.closePath();
// Triangle
ctx.beginPath();
ctx.moveTo(175,150);
ctx.lineTo(200,175);
ctx.lineTo(200,125);
ctx.fill();
ctx.closePath();
// Arcs
ctx.beginPath();
for(var i=0;i<4;i++){
for(var j=0;j<3;j++){
var x = 225+j*50; // x coordinate
var y = 225+i*50; // y coordinate
var radius = 20; // Arc radius
var startAngle = 0; // Starting point on circle
var endAngle = Math.PI+(Math.PI*j)/2; // End point on circle
var anticlockwise = i%2==0 ? false : true; // clockwise or anticlockwise
ctx.beginPath();
ctx.arc(x, y, radius, startAngle, endAngle, anticlockwise);
if (i>1){
ctx.fill();
} else {
ctx.stroke();
}
}
}
ctx.closePath();
// arcTo
ctx.beginPath();
ctx.moveTo(250,150);
ctx.arcTo(350,50,350,100,50);
ctx.lineWidth = 10;
ctx.stroke();
ctx.closePath();
// Quadradic Curves
ctx.beginPath();
ctx.moveTo(75,40);
ctx.bezierCurveTo(75,37,70,25,50,25);
ctx.bezierCurveTo(20,25,20,62.5,20,62.5);
ctx.bezierCurveTo(20,80,40,102,75,120);
ctx.bezierCurveTo(110,102,130,80,130,62.5);
ctx.bezierCurveTo(130,62.5,130,25,100,25);
ctx.bezierCurveTo(85,25,75,37,75,40);
ctx.fill();
ctx.closePath();
ctx.font="20px Arial";
ctx.fillText("Am I Sharp?",10,300);
ctx.fillText("Am I Sharp Also?",10,450);
})();
</script>
</body>