[英]How to use an image DOM element as a value for the source property in jCanvas?
我想测试这个例子: http : //calebevans.me/projects/jcanvas/sandbox.php#%24%28%22canvas%22%29.drawImage%28%7B%0A%20%20source%3A%20% 24%28%27%23image鱼%27%29%5B0%5D%2C%0A%20%20×%3A%2050%2C%20Y%3A%2050%2C%0A%20%20width%3A%20100% 2C%0A%20%20fromCenter%3A%20false%0A%7D%29%3B
但我没有在浏览器中看到任何结果,默认情况下为“img src”。 请有人帮助我。 我该如何使用此功能?
<!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: $('#draggable')[0],
x: 50, y: 50,
width: 60,
fromCenter: false
});
</script>
<body>
<img src="../image/0.jpg" class="drag-image" id="draggable"/>
</div>
</body>
</html>
谢谢。
设置canvas标记的source时,image标记未完全加载。 结果,$('#draggable')[0]返回undefined。 尝试在加载文档时调用drawImage。 以下应该可以解决您的问题。
<!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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