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我有一個簡單的HTML5畫布繪圖應用程序(代碼從here)以下代碼。但是,我無法使用畫布來繪製鼠標。有任何想法嗎?HTML 5畫布繪圖應用程序不繪圖
在Firefox中試過這個,而不是IE。
任何幫助表示讚賞。
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>Untitled Document</title>
<script type="text/javascript">
var canvas = document.querySelector('#paint');
var ctx = canvas.getContext('2d');
var sketch = document.querySelector('#sketch');
var sketch_style = getComputedStyle(sketch);
canvas.width = parseInt(sketch_style.getPropertyValue('width'));
canvas.height = parseInt(sketch_style.getPropertyValue('height'));
var mouse = {x: 0, y: 0};
var last_mouse = {x: 0, y: 0};
/* Mouse Capturing Work */
canvas.addEventListener('mousemove', function(e) {
last_mouse.x = mouse.x;
last_mouse.y = mouse.y;
mouse.x = e.pageX - this.offsetLeft;
mouse.y = e.pageY - this.offsetTop;
}, false);
/* Drawing on Paint App */
ctx.lineWidth = 5;
ctx.lineJoin = 'round';
ctx.lineCap = 'round';
ctx.strokeStyle = 'blue';
canvas.addEventListener('mousedown', function(e) {
canvas.addEventListener('mousemove', onPaint, false);
}, false);
canvas.addEventListener('mouseup', function() {
canvas.removeEventListener('mousemove', onPaint, false);
}, false);
var onPaint = function() {
ctx.beginPath();
ctx.moveTo(last_mouse.x, last_mouse.y);
ctx.lineTo(mouse.x, mouse.y);
ctx.closePath();
ctx.stroke();
};
</script>
<style type="text/css">
html, body {
width: 100%;
height: 100%;
}
#sketch {
border: 10px solid gray;
height: 100%;
}
</style>
</head>
<body>
<div id="sketch">
<canvas id="paint"></canvas>
</div>
</body>
</html>
謝謝你......我看到的教程都沒提到這個...... – IlludiumPu36 2013-03-14 07:01:52