HTML5 Canvas: How to make a loading spinner by rotating the image in degrees?
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by Bill
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Published on 2010-05-03T20:50:05Z
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2010/05/03
21:28 UTC
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I am making a loading spinner with html5 canvas. I have my graphic on the canvas but when i rotate it the image rotates off the canvas. How do I tell it to spin the graphic on its center point?
<!DOCTYPE html>
<html>
<head>
<title>Canvas test</title>
<script type="text/javascript">
window.onload = function() {
var drawingCanvas = document.getElementById('myDrawing');
// Check the element is in the DOM and the browser supports canvas
if(drawingCanvas && drawingCanvas.getContext) {
// Initaliase a 2-dimensional drawing context
var context = drawingCanvas.getContext('2d');
//Load the image object in JS, then apply to canvas onload
var myImage = new Image();
myImage.onload = function() {
context.drawImage(myImage, 0, 0, 27, 27);
}
myImage.src = "img/loading.png";
context.rotate(45);
}
}
</script>
</head>
<body>
<canvas id="myDrawing" width="27" height="27">
</canvas>
</body>
</html>
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