h5 Canvas中Fill 與Stroke文字效果如何實(shí)現(xiàn)

發(fā)布時(shí)間：2020-10-26 09:08:39 來源：億速云閱讀：306 作者：小新欄目：web開發(fā)

這篇文章主要介紹h5 Canvas中Fill 與Stroke文字效果如何實(shí)現(xiàn)，文中介紹的非常詳細(xì)，具有一定的參考價(jià)值，感興趣的小伙伴們一定要看完！

一：顏色填充與描邊
顏色填充可以通過fillStyle來實(shí)現(xiàn)，描邊顏色可以通過strokeStyle來實(shí)現(xiàn)。簡(jiǎn)單示例
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：紋理填充與描邊
HTML5 Canvas還支持紋理填充，通過加載一張紋理圖像，然后創(chuàng)建畫筆模式，創(chuàng)建紋理模式的API為ctx.createPattern(imageTexture,"repeat");第二參數(shù)支持四個(gè)值，分別為”repeat-x”, ”repeat-y”, ”repeat”,”no-repeat”意思是紋理分別沿著X軸，Y軸，XY方向沿重復(fù)或者不重復(fù)。紋理描邊與填充的代碼如下：

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);

紋理圖片：
h5 Canvas中Fill 與Stroke文字效果如何實(shí)現(xiàn)
三：運(yùn)行效果

代碼如下:

<!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> 
<h2>HTML5 Canvas Text Demo - By Gloomy Fish</h2> 
<pre>Fill And Stroke</pre> 
<p id="my_painter"> 
<canvas id="text_canvas"></canvas> 
</p> 
</body> 
</html>

以上是h5 Canvas中Fill 與Stroke文字效果如何實(shí)現(xiàn)的所有內(nèi)容，感謝各位的閱讀！希望分享的內(nèi)容對(duì)大家有幫助，更多相關(guān)知識(shí)，歡迎關(guān)注億速云行業(yè)資訊頻道！

向AI問一下細(xì)節(jié)

h5 Canvas中Fill 與Stroke文字效果如何實(shí)現(xiàn)

猜你喜歡

最新資訊

相關(guān)推薦

相關(guān)標(biāo)簽