[英]How to use an image DOM element as a value for the source property in jCanvas?
我想測試這個例子: http : //calebevans.me/projects/jcanvas/sandbox.php#%24%28%22canvas%22%29.drawImage%28%7B%0A%20%20source%3A%20% 24%28%27%23image魚%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
但我沒有在瀏覽器中看到任何結果,默認情況下為“img src”。 請有人幫助我。 我該如何使用此功能?
<!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: $('#draggable')[0],
x: 50, y: 50,
width: 60,
fromCenter: false
});
</script>
<body>
<img src="../image/0.jpg" class="drag-image" id="draggable"/>
</div>
</body>
</html>
謝謝。
設置canvas標記的source時,image標記未完全加載。 結果,$('#draggable')[0]返回undefined。 嘗試在加載文檔時調用drawImage。 以下應該可以解決您的問題。
<!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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