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h5 Canvas中Fill 与Stroke文字效果实现实例
- 零下一度asal
- 2017-05-17 14:24:552868semak imbas
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 = '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 
代码如下:
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="X-UA-Compatible" content="
chr
ome=IE8">
<meta http-equiv="Content-type" content="text/html;char
set
=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 inst
all
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.li
neW
idth = 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
set
Time
out(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 class="brush:php;toolbar:false">Fill And Stroke