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canvas-test.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1, minimum-scale=1, maximum-scale=1">
<title></title>
<style>
canvas {
background: #eee;
}
</style>
</head>
<body>
<canvas></canvas>
<script>
(function () {
var canvas = document.querySelector( "canvas" );
var gl = canvas.getContext( "2d" );
canvas.width = canvas.height = 500;
document.body.appendChild( canvas );
var img = new Image();
img.src = "img/heart.png";
img.onload = function () {
gl.save();
gl.globalAlpha = 0.5;
gl.translate( 250 , 250 );
gl.rotate( Math.PI / 180 * 20 );
gl.drawImage( img , 0 , 0 , 20 , 20 );
gl.restore();
gl.save();
gl.translate( 240 , 240 );
gl.rotate( Math.PI / 180 * 10 );
gl.drawImage( img , 0 , 0 , 20 , 20 );
gl.restore();
}
})();
</script>
</body>
</html>