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HTML5 Canvas如何实现纹理填充与描边(Fill And Stroke)

2013-07-15 16:36 501 查看

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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