HTML5 Canvas阴影使用方法实例演示
导读：收集整理的这篇文章主要介绍了HTML5 Canvas阴影使用方法实例演示，觉得挺不错的，现在分享给大家，也给大家做个参考。 HTML5 canvas中提供了设置阴影的四个属性值分别为： context.shadowColor =...
收集整理的这篇文章主要介绍了HTML5 Canvas阴影使用方法实例演示，觉得挺不错的，现在分享给大家，也给大家做个参考。 HTML5 canvas中提供了设置阴影的四个属性值分别为： context.shadowColor = “red” 表示设置阴影颜色为红色
context.shadowOffsetX = 0表示阴影相对TEXT的水平距离，0表示两者水平位置重合
context.shadowOffsetY = 0表示阴影相对TEXT的垂直距离，0表示两者垂直位置重合
context.shadowBlur = 10 阴影模糊效果，值越大模糊越厉害。
一个最简单的带有阴影的矩形代码如下：
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.fillRect(10, hh+10, 200,canvas.height/4-20);
效果如下：
阴影文字：
只要设置shadowOffsetX与shadowOffsetY的值，当值都正数时，阴影相对文字的右下
方偏移。当值都为负数时，阴影相对文字的左上方偏移。
3D拉影效果：
在同一位置不断的重复绘制文字同时改变shadowOffsetX、shadowOffsetY、shadowBlur
的值，从小到大不断偏移不断增加，透明度也不断增加。就得到了拉影效果文字。
边缘模糊效果文字：
在3D拉影效果的基础上在四个方向重复，就得到了边缘羽化的文字效果。
运行效果：
序代码：
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 compatible 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 = i*2;
context.shadowOffsetY = i*2;
context.shadowBlur = i*2;
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 = -i*2;
context.shadowBlur = i*2;
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 = i*2;
context.shadowBlur = i*2;
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 = i*2;
context.shadowOffsetY = 0;
context.shadowBlur = i*2;
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 = -i*2;
context.shadowOffsetY = 0;
context.shadowBlur = i*2;
context.fillStyle = "RGBA(127, 127, 127, 1)";
context.fillText("Blur Canvas", 40, 80+hh);
}
}
/script>
/head>
body>
h1> HTML5 Canvas Clip Demo - By Gloomy Fish/h1>
PRe> Fill And Stroke Clip/pre>
div id="my_painter">
canvas id="text_canvas"> /canvas>
/div>
/body>
/html>
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