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HTML5 Canvas 填充与描边(Fill And Stroke)

2013-07-12 15:00 399 查看

HTML5 Canvas 填充与描边(Fill And Stroke) 演示HTML5 Canvas Fill 与Stroke文字效果，基于Canvas如何实
现纹理填充与描边。

一：颜色填充与描边
颜色填充可以通过fillStyle来实现，描边颜色可以通过strokeStyle来实现。简单示例
如下：
// fill and stroke text ctx.font = '60pt Calibri'; ctx.lineWidth = 3; ctx.strokeStyle = 'green'; ctx.strokeText('Hello World!', 20, 100); ctx.fillStyle = 'red'; ctx.fillText('Hello World!', 20, 100);
二：纹理填充与描边
HTML5 Canvas还支持纹理填充，通过加载一张纹理图像，然后创建画笔模式，创建
纹理模式的API为ctx.createPattern(imageTexture,"repeat");第二参数支持四个
值，分别为”repeat-x”, ”repeat-y”, ”repeat”,”no-repeat”意思是纹理分别沿着
X轴，Y轴，XY方向沿重复或者不重复。纹理描边与填充的代码如下：
var woodfill = ctx.createPattern(imageTexture,"repeat"); ctx.strokeStyle = woodfill; ctx.strokeText('Hello World!', 20, 200); // fill rectangle ctx.fillStyle = woodfill; ctx.fillRect(60, 240, 260, 440);
纹理图片：

三：运行效果

代码：

<!DOCTYPE html> <html> <head> <meta http-equiv="X-UA-Compatible" content="chrome=IE8"> <meta http-equiv="Content-type" content="text/html;charset=UTF-8"> <title>Canvas Fill And Stroke Text Demo</title> <link href="default.css" rel="stylesheet" /> 	<script> 		var ctx = null; // global variable 2d context 		var imageTexture = null; 		window.onload = function() { 			var canvas = document.getElementById("text_canvas"); 			console.log(canvas.parentNode.clientWidth); 			canvas.width = canvas.parentNode.clientWidth; 			canvas.height = canvas.parentNode.clientHeight; 			 			if (!canvas.getContext) { 			    console.log("Canvas not supported. Please install a HTML5 compatible browser."); 			    return; 			} 			 			// get 2D context of canvas and draw rectangel 			ctx = canvas.getContext("2d"); 			ctx.fillStyle="black"; 			ctx.fillRect(0, 0, canvas.width, canvas.height); 			 			// fill and stroke text 			ctx.font = '60pt Calibri'; 			ctx.lineWidth = 3; 			ctx.strokeStyle = 'green'; 			ctx.strokeText('Hello World!', 20, 100); 			ctx.fillStyle = 'red'; 			ctx.fillText('Hello World!', 20, 100); 			 			// fill and stroke by pattern 			imageTexture = document.createElement('img'); 			imageTexture.src = "../pattern.png"; 			imageTexture.onload = loaded(); 		} 		 		function loaded() { 			// delay to image loaded 			setTimeout(textureFill, 1000/30); 		} 		 		function textureFill() { 			// var woodfill = ctx.createPattern(imageTexture, "repeat-x"); 			// var woodfill = ctx.createPattern(imageTexture, "repeat-y"); 			// var woodfill = ctx.createPattern(imageTexture, "no-repeat"); 			var woodfill = ctx.createPattern(imageTexture, "repeat"); 			ctx.strokeStyle = woodfill; 			ctx.strokeText('Hello World!', 20, 200); 			 			// fill rectangle 			ctx.fillStyle = woodfill; 			ctx.fillRect(60, 240, 260, 440); 		} 		 	</script> </head> <body> 	<h1>HTML5 Canvas Text Demo - By Gloomy Fish</h1> 	<pre>Fill And Stroke</pre> 	<div id="my_painter"> 		<canvas id="text_canvas"></canvas> 	</div> </body> </html>

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