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制作渐变图片:《CSS3 Gradient》

2013-05-13 15:41 246 查看
CSS3 Gradient分为linear-gradient(线性渐变)和radial-gradient(径向渐变)。而我们今天主要是针对线性渐变来剖析其具体的用法。为了更好的应用CSS3 Gradient,我们需要先了解一下目前的几种现代浏览器的内核,主流内容主要有Mozilla(熟悉的有Firefox,Flock等浏览器)、WebKit(熟悉的有Safari、Chrome等浏览器)、Opera(Opera浏览器)、Trident(讨厌的IE浏览器)。本文照常忽略IE不管,我们主要看看在Mozilla、Webkit、Opera下的应用,当然在IE下也可以实现,他需要通过IE特有的滤镜来实现,在后面会列出滤镜的使用语法,但不会具体介绍如何实用,感兴趣的可以搜索相关技术文档。那我们了解了这些,现在就开始今天的主题吧

CSS3的线性渐变

一、线性渐变在Mozilla下的应用

语法:

-moz-linear-gradient( [<point> || <angle>,]? <stop>, <stop> [, <stop>]* )
参数:其共有三个参数,第一个参数表示线性渐变的方向,top是从上到下、left是从左到右,如果定义成left top,那就是从左上角到右下角。第二个和第三个参数分别是起点颜色和终点颜色。你还可以在它们之间插入更多的参数,表示多种颜色的渐变。如图所示:



根据上面的介绍,我们先来看一个简单的例子:

HTML:

<div class="example example1"></div>
CSS:

.example {
width: 150px;
height: 80px;
}
(如无特殊说明,我们后面的示例都是应用这一段html和css 的基本代码)

现在我们给这个div应用一个简单的渐变样式:

.example1 {
background: -moz-linear-gradient( top,#ccc,#000);
}
效果如下:



注:这个效果暂时只有在Mozilla内核的浏览器下才能正常显示。

二、线性渐变在Webkit下的应用

语法:

-webkit-linear-gradient( [<point> || <angle>,]? <stop>, <stop> [, <stop>]* )//最新发布书写语法
-webkit-gradient(<type>, <point> [, <radius>]?, <point> [, <radius>]? [, <stop>]*) //老式语法书写规则
参数:-webkit-gradient是webkit引擎对渐变的实现参数,一共有五个。第一个参数表示渐变类型(type),可以是linear(线性渐变)或者radial(径向渐变)。第二个参数和第三个参数,都是一对值,分别表示渐变起点和终点。这对值可以用坐标形式表示,也可以用关键值表示,比如 left top(左上角)和left bottom(左下角)。第四个和第五个参数,分别是两个color-stop函数。color-stop函数接受两个参数,第一个表示渐变的位置,0为起点,0.5为中点,1为结束点;第二个表示该点的颜色。如图所示:





我们先来看一个老式的写法示例:

background: -webkit-gradient(linear,center top,center bottom,from(#ccc), to(#000));
效果如下所示



接着我们在来看一下新式的写法:

-webkit-linear-gradient(top,#ccc,#000);
这个效果我就不在贴出来了,大家在浏览器中一看就明白了,他们是否一致的效果。仔细对比,在Mozilla和Webkit下两者的学法都基本上一致了,只是其前缀的区别,当然哪一天他们能统一成一样,对我们来说当然是更好了,那就不用去处理了。将大大节省我们的开发时间哟。

三、线性渐变在Opera下的应用

语法:

-o-linear-gradient([<point> || <angle>,]? <stop>, <stop> [, <stop>]); /* Opera 11.10+ */
参数:-o-linear-gradient有三个参数。第一个参数表示线性渐变的方向,top是从上到下、left是从左到右,如果定义成left top,那就是从左上角到右下角。第二个和第三个参数分别是起点颜色和终点颜色。你还可以在它们之间插入更多的参数,表示多种颜色的渐变。(注:Opera支持的版本有限,本例测试都是在Opera11.1版本下,后面不在提示),如图所示:



示例:

background: -o-linear-gradient(top,#ccc, #000);
效果如图所示



四、线性渐变在Trident (IE)下的应用

语法:

filter: progid:DXImageTransform.Microsoft.gradient(GradientType=0, startColorstr=#1471da, endColorstr=#1C85FB);/*IE<9>*/
-ms-filter: "progid:DXImageTransform.Microsoft.gradient (GradientType=0, startColorstr=#1471da, endColorstr=#1C85FB)";/*IE8+*/
IE依靠滤镜实现渐变。startColorstr表示起点的颜色,endColorstr表示终点颜色。GradientType表示渐变类型,0为缺省值,表示垂直渐变,1表示水平渐变。如图所示:



上面我们主要介绍了线性渐变在上述四大核心模块下的实现方法,接着我们主要针对线性渐变在MOZ、Webkit、Opera三大模块下实现各种不同线性渐变实例:

从上面的语法中我们可以很清楚的知道,要创建一个线性渐变,我们需要创建一个起点和一个渐变方向(或角度),定义一个起始色:

-moz-linear-gradient( [<point> || <angle>,]? <stop>, <stop> [, <stop>]* )
-webkit-linear-gradient( [<point> || <angle>,]? <stop>, <stop> [, <stop>]* )
-o-linear-gradient( [<point> || <angle>,]? <stop>, <stop> [, <stop>]* )
具体应用如下:

background:-moz-linear-gradient(left,#ace,#f96);/*Mozilla*/
background:-webkit-gradient(linear,0 50%,100% 50%,from(#ace),to(#f96));/*Old gradient for webkit*/
background:-webkit-linear-gradient(left,#ace,#f96);/*new gradient for Webkit*/
background:-o-linear-gradient(left,#ace,#f96); /*Opera11*/
效果如下:



起始点(Starting Point)的工作方式类似于background position。您可以设置水平和垂直位置为百分比,或以像素为单位,或在水平方向上可以使用left/center/right,在垂直方向上可以使用top/center/bottom。位置起始于左上角。如果你不指定水平或垂直位置,它将默认为center。其工作方式主要包含:Top → Bottom、Left → Right、bottom → top、right → left等,接着我们主要一种一种来看其实现的效果:

1、开始于center(水平方向)和top(垂直方向)也就是Top → Bottom:

/* Firefox 3.6+ */
background: -moz-linear-gradient(top, #ace, #f96);
/* Safari 4-5, Chrome 1-9 */
/* -webkit-gradient(, [, ]?, [, ]? [, ]*) */
background: -webkit-gradient(linear,top,from(#ace),to(#f96));
/* Safari 5.1+, Chrome 10+ */
background: -webkit-linear-gradient(top, #ace, #f96);
/* Opera 11.10+ */
background: -o-linear-gradient(top, #ace, #f96);
效果:



2、始于left(水平方向)和center(垂直方向)也是就Left → Right:

/* Firefox 3.6+ */
background: -moz-linear-gradient(left, #ace, #f96);
/* Safari 5.1+, Chrome 10+ */
background: -webkit-linear-gradient(left, #ace, #f96);
/* Opera 11.10+ */
background: -o-linear-gradient(left, #ace, #f96);
效果如下:



3、起始于left(水平方向)和top(垂直方向):

background: -moz-linear-gradient(left top, #ace, #f96);
background: -webkit-linear-gradient(left top, #ace, #f96);
background: -o-linear-gradient(left top, #ace, #f96);
效果如下:



4、Linear Gradient (with Even Stops):

/* Firefox 3.6+ */
background: -moz-linear-gradient(left, #ace, #f96, #ace, #f96, #ace);
/* Safari 4-5, Chrome 1-9 */
background: -webkit-gradient(linear, left top, right top, from(#ace), color-stop(0.25, #f96), color-stop(0.5, #ace), color-stop(0.75, #f96), to(#ace));
/* Safari 5.1+, Chrome 10+ */
background: -webkit-linear-gradient(left, #ace, #f96, #ace, #f96, #ace);
/* Opera 11.10+ */
background: -o-linear-gradient(left, #ace, #f96, #ace, #f96, #ace);
效果如下:



5、with Specified Arbitrary Stops:

/* Firefox 3.6+ */
background: -moz-linear-gradient(left, #ace, #f96 5%, #ace, #f96 95%, #ace);
/* Safari 4-5, Chrome 1-9 */
background: -webkit-gradient(linear, left top, right top, from(#ace), color-stop(0.05, #f96), color-stop(0.5, #ace), color-stop(0.95, #f96), to(#ace));
/* Safari 5.1+, Chrome 10+ */
background: -webkit-linear-gradient(left, #ace, #f96 5%, #ace, #f96 95%, #ace);
/* Opera 11.10+ */
background: -o-linear-gradient(left, #ace, #f96 5%, #ace, #f96 95%, #ace);
效果如下:



6、角度(Angle):

正如上面看到的示例,如果您不指定一个角度,它会根据起始位置自动定义。如果你想更多的控制渐变的方向,您不妨设置角度试试。例如,下面的两个渐变具有相同的起点left center,但是加上一个30度的角度。

没有角度的示例代码:

background: -moz-linear-gradient(left, #ace, #f96);
background: -webkit-linear-gradient(left,#ace,#f96);
background: -o-linear-gradient(left, #ace, #f96);
加上30度的角度代码:

background: -moz-linear-gradient(left 30deg, #ace, #f96);
background: -webkit-gradient(linear, 0 0, 100% 100%, from(#ace),to(#f96));
background: -o-linear-gradient(30deg, #ace, #f96);
效果图如下:





当指定的角度,请记住,它是一个由水平线与渐变线产生的的角度,逆时针方向。因此,使用0deg将产生一个左到右横向梯度,而90度将创建一个从底部到顶部的垂直渐变。我来看看你核心代码:

background: -moz-linear-gradient(<angle>, #ace, #f96);
background: -webkit-gradient(<type>,<angle>, from(#ace), to(#f96));
background: -webkit-linear-gradient(<angle>, #ace, #f96);
background: -o-linear-gradient(<angle>, #ace, #f96);
我们来看看各角度的区别

.deg0 {
background: -moz-linear-gradient(0deg, #ace, #f96);
background: -webkit-gradient(linear,0 50%,100% 50%,from(#ace),to(#f96));
background: -webkit-linear-gradient(0deg, #ace, #f96);
background: -o-linear-gradient(0deg, #ace, #f96);
}

.deg45 {
background: -moz-linear-gradient(45deg, #ace, #f96);
background: -webkit-gradient(linear,0 100%,100% 0%,from(#ace),to(#f96));
background: -webkit-linear-gradient(45deg, #ace, #f96);
background: -o-linear-gradient(45deg, #ace, #f96);
}
.deg90 {
background: -moz-linear-gradient(90deg, #ace, #f96);
background: -webkit-gradient(linear,50% 100%,50% 0%,from(#ace),to(#f96));
background: -webkit-linear-gradient(90deg, #ace, #f96);
background: -o-linear-gradient(90deg, #ace, #f96);
}
.deg135 {
background: -moz-linear-gradient(135deg, #ace, #f96);
background: -webkit-gradient(linear,100% 100%,0 0,from(#ace),to(#f96));
background: -webkit-linear-gradient(135deg, #ace, #f96);
background: -o-linear-gradient(135deg, #ace, #f96);
}
.deg180 {
background: -moz-linear-gradient(180deg, #ace, #f96);
background: -webkit-gradient(linear,100% 50%,0 50%,from(#ace),to(#f96));
background: -webkit-linear-gradient(180deg, #ace, #f96);
background: -o-linear-gradient(180deg, #ace, #f96);
}
.deg225 {
background: -moz-linear-gradient(225deg, #ace, #f96);
background: -webkit-gradient(linear,100% 0%,0 100%,from(#ace),to(#f96));
background: -webkit-linear-gradient(225deg, #ace, #f96);
background: -o-linear-gradient(225deg, #ace, #f96);
}
.deg270 {
background: -moz-linear-gradient(270deg, #ace, #f96);
background: -webkit-gradient(linear,50% 0%,50% 100%,from(#ace),to(#f96));
background: -webkit-linear-gradient(270deg, #ace, #f96);
background: -o-linear-gradient(270deg, #ace, #f96);
}
.deg315 {
background: -moz-linear-gradient(315deg, #ace, #f96);
background: -webkit-gradient(linear,0% 0%,100% 100%,from(#ace),to(#f96));
background: -webkit-linear-gradient(315deg, #ace, #f96);
background: -o-linear-gradient(315deg, #ace, #f96);
}
.deg360 {
background: -moz-linear-gradient(360deg, #ace, #f96);
background: -webkit-gradient(linear,0 50%,100% 50%,from(#ace),to(#f96));
background: -webkit-linear-gradient(360deg, #ace, #f96);
background: -o-linear-gradient(360deg, #ace, #f96);
}
效果如下:



除了起始位置和角度,你应该指定起止颜色。起止颜色是沿着渐变线,将会在指定位置(以百分比或长度设定)含有指定颜色的点。色彩的起止数是无限的。如果您使用一个百分比位置,0%代表起点和100%是终点,但区域外的值可以被用来达到预期的效果。 这也是通过CSS3 Gradient制作渐变的一个关键所在,其直接影响了你的设计效果,像我们这里的示例都不是完美的效果,只是为了能给大家展示一个渐变的效果,大家就这样先用着吧。我们接着看一下不同的起址色的示例:

background: -moz-linear-gradient(top, #ace, #f96 80%, #f96);
background: -webkit-linear-gradient(top,#ace,#f96 80%,#f96);
background: -o-linear-gradient(top, #ace, #f96 80%, #f96);
效果如下:



如果没有指定位置,颜色会均匀分布。如下面的示例:

background: -moz-linear-gradient(left, red, #f96, yellow, green, #ace);
background: -webkit-linear-gradient(left,red,#f96,yellow,green,#ace);
background: -o-linear-gradient(left, red, #f96, yellow, green, #ace);
效果如下



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</div>

<div class="demo clearfix">
<a href="http://www.w3cplus.com" target="_blank" class="links item first" id="first" title="w3cplus">1</a>
<a href="" class="links active item" title="test website" target="_blank" lang="zh">2</a>
<a href="sites/file/test.html" class="links item" title="this is a link" lang="zh-cn">3</a>
<a href="sites/file/test.png" class="links item" target="_balnk" lang="zh-tw">4</a>
<a href="sites/file/image.jpg" class="links item" title="zh-cn">5</a>
<a href="mailto:w3cplus@hotmail" class="links item" title="website link" lang="zh">6</a>
<a href="" class="links item" title="open the website" lang="cn">7</a>
<a href="" class="links item" title="close the website" lang="en-zh">8</a>
<a href="" class="links item" title="http://www.sina.com">9</a>
<a href="" class="links item last" id="last">10</a>
</div>

<div class="demo clearfix">
<a href="http://www.w3cplus.com" target="_blank" class="links item first" id="first" title="w3cplus">1</a>
<a href="" class="links active item" title="test website" target="_blank" lang="zh">2</a>
<a href="sites/file/test.html" class="links item" title="this is a link" lang="zh-cn">3</a>
<a href="sites/file/test.png" class="links item" target="_balnk" lang="zh-tw">4</a>
<a href="sites/file/image.jpg" class="links item" title="zh-cn">5</a>
<a href="mailto:w3cplus@hotmail" class="links item" title="website link" lang="zh">6</a>
<a href="" class="links item" title="open the website" lang="cn">7</a>
<a href="" class="links item" title="close the website" lang="en-zh">8</a>
<a href="" class="links item" title="http://www.sina.com">9</a>
<a href="" class="links item last" id="last">10</a>
</div>

<div class="demo clearfix">
<a href="http://www.w3cplus.com" target="_blank" class="links item first" id="first" title="w3cplus">1</a>
<a href="" class="links active item" title="test website" target="_blank" lang="zh">2</a>
<a href="sites/file/test.html" class="links item" title="this is a link" lang="zh-cn">3</a>
<a href="sites/file/test.png" class="links item" target="_balnk" lang="zh-tw">4</a>
<a href="sites/file/image.jpg" class="links item" title="zh-cn">5</a>
<a href="mailto:w3cplus@hotmail" class="links item" title="website link" lang="zh">6</a>
<a href="" class="links item" title="open the website" lang="cn">7</a>
<a href="" class="links item" title="close the website" lang="en-zh">8</a>
<a href="" class="links item" title="http://www.sina.com">9</a>
<a href="" class="links item last" id="last">10</a>
</div>

<div class="demo clearfix">
<a href="http://www.w3cplus.com" target="_blank" class="links item first" id="first" title="w3cplus">1</a>
<a href="" class="links active item" title="test website" target="_blank" lang="zh">2</a>
<a href="sites/file/test.html" class="links item" title="this is a link" lang="zh-cn">3</a>
<a href="sites/file/test.png" class="links item" target="_balnk" lang="zh-tw">4</a>
<a href="sites/file/image.jpg" class="links item" title="zh-cn">5</a>
<a href="mailto:w3cplus@hotmail" class="links item" title="website link" lang="zh">6</a>
<a href="" class="links item" title="open the website" lang="cn">7</a>
<a href="" class="links item" title="close the website" lang="en-zh">8</a>
<a href="" class="links item" title="http://www.sina.com">9</a>
<a href="" class="links item last" id="last">10</a>
</div>

<div class="demo clearfix">
<a href="http://www.w3cplus.com" target="_blank" class="links item first" id="first" title="w3cplus">1</a>
<a href="" class="links active item" title="test website" target="_blank" lang="zh">2</a>
<a href="sites/file/test.html" class="links item" title="this is a link" lang="zh-cn">3</a>
<a href="sites/file/test.png" class="links item" target="_balnk" lang="zh-tw">4</a>
<a href="sites/file/image.jpg" class="links item" title="zh-cn">5</a>
<a href="mailto:w3cplus@hotmail" class="links item" title="website link" lang="zh">6</a>
<a href="" class="links item" title="open the website" lang="cn">7</a>
<a href="" class="links item" title="close the website" lang="en-zh">8</a>
<a href="" class="links item" title="http://www.sina.com">9</a>
<a href="" class="links item last" id="last">10</a>
</div>

<div class="demo clearfix">
<a href="http://www.w3cplus.com" target="_blank" class="links item first" id="first" title="w3cplus">1</a>
<a href="" class="links active item" title="test website" target="_blank" lang="zh">2</a>
<a href="sites/file/test.html" class="links item" title="this is a link" lang="zh-cn">3</a>
<a href="sites/file/test.png" class="links item" target="_balnk" lang="zh-tw">4</a>
<a href="sites/file/image.jpg" class="links item" title="zh-cn">5</a>
<a href="mailto:w3cplus@hotmail" class="links item" title="website link" lang="zh">6</a>
<a href="" class="links item" title="open the website" lang="cn">7</a>
<a href="" class="links item" title="close the website" lang="en-zh">8</a>
<a href="" class="links item" title="http://www.sina.com">9</a>
<a href="" class="links item last" id="last">10</a>
</div>

<div class="demo clearfix">
<a href="http://www.w3cplus.com" target="_blank" class="links item first" id="first" title="w3cplus">1</a>
<a href="" class="links active item" title="test website" target="_blank" lang="zh">2</a>
<a href="sites/file/test.html" class="links item" title="this is a link" lang="zh-cn">3</a>
<a href="sites/file/test.png" class="links item" target="_balnk" lang="zh-tw">4</a>
<a href="sites/file/image.jpg" class="links item" title="zh-cn">5</a>
<a href="mailto:w3cplus@hotmail" class="links item" title="website link" lang="zh">6</a>
<a href="" class="links item" title="open the website" lang="cn">7</a>
<a href="" class="links item" title="close the website" lang="en-zh">8</a>
<a href="" class="links item" title="http://www.sina.com">9</a>
<a href="" class="links item last" id="last">10</a>
</div>
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