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<title>Four methods of Javascript animation - 3. Clip-rect method</title>
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<a href="http://michalbe.blogspot.com">MichalBe's Blog</a>
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var width = 300,
height = 56,
frames = 10,
actualFrame = 0,
posX = 100,
posY = 100;
var canvas = document.createElement('img'),
canvasStyle = canvas.style;
canvas.src = 'http://images.virtualdesign.pl/images/78335sprite.jpg';
canvasStyle.position = "absolute";
canvasStyle.top = posX;
canvasStyle.left = posY;
//canvasStyle.width = width;
//canvasStyle.height = height;
document.body.appendChild(canvas);
var draw = function(){
var frameTop = height * actualFrame,
frameLeft = 0,
frameRight = width,
frameBottom = frameTop + height;
canvasStyle.clip = "rect("
+frameTop +"px " //top
+frameRight +"px " //right
+frameBottom +"px " //bottom
+frameLeft +"px )"; //left
//canvasStyle.left = posX - width * actualAnimation;
canvasStyle.top = posY - height * actualFrame;
if (actualFrame == frames) {
actualFrame = 0;
}
else {
actualFrame++;
}
}
setInterval(draw, 80);
Output
300px
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