日期:2014-05-17  浏览次数:20741 次

Html5学习---------canvas阴影效果的显示
<!doctype html>
<html>
<head>
<meta charset="utf-8" />
<script type="text/javascript">
function drawShadow(e) {
	var shadowCanvasElt = document.getElementById("shadowCanvas");
	if (shadowCanvasElt && shadowCanvasElt.getContext) {
		var shadowCanvasCtx = shadowCanvasElt.getContext("2d");
		//基本阴影属性设定
		shadowCanvasCtx.shadowColor = "#000000";
		//在X轴上偏移10(右)
		shadowCanvasCtx.shadowOffsetX = 10;
		//在Y轴上偏移10(右)
		shadowCanvasCtx.shadowOffsetY = 10;
		//高斯模糊
		shadowCanvasCtx.shadowBlur = 10;
		//画一个简单的矩形
		shadowCanvasCtx.fillStyle = "red";
		shadowCanvasCtx.fillRect(75, 20, 200, 100);
		//文字渲染
		var theString = "在canvas上绘制文字";
		//设置一下font
		shadowCanvasCtx.font = "25pt 微软雅黑";
		//将阴影减弱一些
		shadowCanvasCtx.fillStyle = "green";
		shadowCanvasCtx.shadowColor = "rgba(0,100,100,0.5)";
		//在X轴上偏移5(左)
		shadowCanvasCtx.shadowOffsetX = -5;
		//在Y轴上偏移5(左)
		shadowCanvasCtx.shadowOffsetY = -5;
		//高斯模糊
		shadowCanvasCtx.shadowBlur = 5;
		shadowCanvasCtx.fillText(theString, 50, 200);
	}
	else{
		alert("您的浏览器不支持canvas,请更换!");
	}
}
window.addEventListener("load", drawShadow, false);
</script>
</head>
<body>
<canvas id="shadowCanvas" width="400px" height="300px" style="border:1px dotted">
</canvas>
</body>
</html>


效果图:


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