h5 Canvas中Fill 与Stroke文字效果实现实例

百变鹏仔 2个月前 (10-18) #H5教程

文章标签实例

本文为大家详细介绍下HTML5 Canvas Fill 与Stroke文字效果，基于Canvas如何实现纹理填充与描边、颜色填充与描边，具体代码如下，感兴趣的朋友可以参考下哈，希望对大家有所帮助演示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 = &#39;60pt Calibri&#39;; ctx.lineWidth = 3; ctx.strokeStyle = &#39;green&#39;; ctx.strokeText(&#39;Hello World!&#39;, 20, 100); ctx.fillStyle = &#39;red&#39;; ctx.fillText(&#39;Hello World!&#39;, 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(&#39;Hello World!&#39;, 20, 200); // fill rectangle ctx.fillStyle = woodfill; ctx.fillRect(60, 240, 260, 440);

纹理图片：

三：运行效果

代码如下:

<!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 = &#39;60pt Calibri&#39;; ctx.lineWidth = 3; ctx.strokeStyle = &#39;green&#39;; ctx.strokeText(&#39;Hello World!&#39;, 20, 100); ctx.fillStyle = &#39;red&#39;; ctx.fillText(&#39;Hello World!&#39;, 20, 100); // fill and stroke by pattern imageTexture = document.createElement(&#39;img&#39;); 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(&#39;Hello World!&#39;, 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 class="brush:php;toolbar:false">Fill And Stroke

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