How to use an image DOM element as a value for the source property in jCanvas?
Question
I want to test this example : http://calebevans.me/projects/jcanvas/sandbox.php#%24%28%22canvas%22%29.drawImage%28%7B%0A%20%20source%3A%20%24%28%27%23image-fish%27%29%5B0%5D%2C%0A%20%20x%3A%2050%2C%20y%3A%2050%2C%0A%20%20width%3A%20100%2C%0A%20%20fromCenter%3A%20false%0A%7D%29%3B
But I don't see any result in the browser except image by default "img src". Please someone help me. How can I use this function?
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>Demo</title>
<canvas width="500" height="250"></canvas>
</head>
<script src="jquery.js"></script>
<script src="jcanvas.js"></script>
<script>
$("canvas").drawImage({
source: $('#draggable')[0],
x: 50, y: 50,
width: 60,
fromCenter: false
});
</script>
<body>
<img src="../image/0.jpg" class="drag-image" id="draggable"/>
</div>
</body>
</html>
Thanks.
1 answers
solution1
2 2012-06-04 18:34:41
image tag is not fully loaded when source for the canvas tag is set. As a result, $('#draggable')[0] is returning undefined. try calling drawImage on load of the document. The following should fix your problem.
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>Demo</title>
<canvas width="500" height="250"></canvas>
</head>
<script src="jquery.js"></script>
<script src="jcanvas.js"></script>
<script>
$(document).ready(function(){
$("canvas").drawImage({
source: $('#draggable')[0],
x: 50, y: 50,
width: 60,
fromCenter: false
});
});
</script>
<body>
<img src="../image/0.jpg" class="drag-image" id="draggable"/>
</div>
</body>
</html>
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