主页 / 建站知识 /

html5实现canvas阴影效果示例

建站知识 2021-07-02 23:00www.168986.cn长沙网站建设

在HTML5中实现Canvas阴影效果


复制代码
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 Clip 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 patible browser.");
return;
}
var context = canvas.getContext('2d');

// section one - shadow and blur
context.fillStyle="black";
context.fillRect(0, 0, canvas.width, canvas.height/4);
context.font = '60pt Calibri';

context.shadowColor = "white";
context.shadowOffsetX = 0;
context.shadowOffsetY = 0;
context.shadowBlur = 20;
context.fillText("Blur Canvas", 40, 80);
context.strokeStyle = "RGBA(0, 255, 0, 1)";
context.lineWidth = 2;
context.strokeText("Blur Canvas", 40, 80);

// section two - shadow font
var hh = canvas.height/4;
context.fillStyle="white";
context.fillRect(0, hh, canvas.width, canvas.height/4);
context.font = '60pt Calibri';

context.shadowColor = "RGBA(127,127,127,1)";
context.shadowOffsetX = 3;
context.shadowOffsetY = 3;
context.shadowBlur = 0;
context.fillStyle = "RGBA(0, 0, 0, 0.8)";
context.fillText("Blur Canvas", 40, 80+hh);

// section three - down shadow effect
var hh = canvas.height/4 + hh;
context.fillStyle="black";
context.fillRect(0, hh, canvas.width, canvas.height/4);
for(var i = 0; i < 10; i++)
{
context.shadowColor = "RGBA(255, 255, 255," + ((10-i)/10) + ")";
context.shadowOffsetX = i2;
context.shadowOffsetY = i2;
context.shadowBlur = i2;
context.fillStyle = "RGBA(127, 127, 127, 1)";
context.fillText("Blur Canvas", 40, 80+hh);
}

// section four - fade effect
var hh = canvas.height/4 + hh;
context.fillStyle="green";
context.fillRect(0, hh, canvas.width, canvas.height/4);
for(var i = 0; i < 10; i++)
{
context.shadowColor = "RGBA(255, 255, 255," + ((10-i)/10) + ")";
context.shadowOffsetX = 0;
context.shadowOffsetY = -i2;
context.shadowBlur = i2;
context.fillStyle = "RGBA(127, 127, 127, 1)";
context.fillText("Blur Canvas", 40, 80+hh);
}
for(var i = 0; i < 10; i++)
{
context.shadowColor = "RGBA(255, 255, 255," + ((10-i)/10) + ")";
context.shadowOffsetX = 0;
context.shadowOffsetY = i2;
context.shadowBlur = i2;
context.fillStyle = "RGBA(127, 127, 127, 1)";
context.fillText("Blur Canvas", 40, 80+hh);
}
for(var i = 0; i < 10; i++)
{
context.shadowColor = "RGBA(255, 255, 255," + ((10-i)/10) + ")";
context.shadowOffsetX = i2;
context.shadowOffsetY = 0;
context.shadowBlur = i2;
context.fillStyle = "RGBA(127, 127, 127, 1)";
context.fillText("Blur Canvas", 40, 80+hh);
}
for(var i = 0; i < 10; i++)
{
context.shadowColor = "RGBA(255, 255, 255," + ((10-i)/10) + ")";
context.shadowOffsetX = -i2;
context.shadowOffsetY = 0;
context.shadowBlur = i2;
context.fillStyle = "RGBA(127, 127, 127, 1)";
context.fillText("Blur Canvas", 40, 80+hh);
}
}

</script>
</head>
<body>
<h1>HTML5 Canvas</h1>
<pre>Fill And Stroke Clip</pre>
<div id="my_painter">
<canvas id="text_canvas"></canvas>
</div>
</body>
</html>

上一篇：HTML5本地存储localStorage、sessionStorage基本用法、遍 下一篇：html5 利用重力感应实现摇一摇换颜色可用来做抽

长沙网站设计

Copyright © 2016-2025 www.168986.cn 狼蚁网络 版权所有 Power by