Created
March 13, 2011 15:22
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Canvas exemple used in a video tutorial
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<html> | |
<head> | |
<style> | |
body { | |
background: #ddd; | |
} | |
canvas { | |
background: #fff; | |
} | |
</style> | |
</head> | |
<body> | |
<canvas id="sketch" width="300" height="300"></canvas> | |
<img id="image" src="http://www.whatwg.org/images/logo" style="display: none;" /> | |
<script type="text/javascript"> | |
(function(){ | |
var canvas = document.getElementById('sketch'); | |
var ctx = canvas.getContext('2d'); | |
var img = document.getElementById('image'); | |
var i = 0; | |
setInterval(function() { | |
ctx.clearRect(0, 0, 300, 300); | |
ctx.drawImage(img, 0, 0, 300, 300); | |
ctx.fillStyle = 'rgba(255, 0, '+Math.floor(Math.sin(i/50)*255)+', 0.8)'; | |
ctx.fillRect(100, i % 300, 100, 100); | |
/* | |
ctx.strokeStyle = '#09F'; | |
ctx.lineWidth = 5; | |
ctx.beginPath(); // commence à tracer un chemin | |
ctx.moveTo(0, 20); // défini le premier point de tracage à la position (0, 20) | |
ctx.lineTo(canvas.width-100, 30); // Tracer une ligne jusqu'à la position (canvas.width, 30). canvas.width désigne la largeur du canvas (500 dans notre exemple). | |
ctx.bezierCurveTo(100, 200, 0, 100, 300, 300); | |
ctx.stroke(); // Indique au canvas de dessiner le chemin tracé depuis le beginPath | |
*/ | |
++ i; | |
}, 30); | |
}()); | |
</script> | |
</body> | |
</html> |
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