我们利用css3中的transform可以实现文字或图像的旋转、缩放、倾斜和移动四种类型的变形处理。
本文使用的是标准的transform，亦可以使用各个浏览器对应私有的属性。对应如下
- -webkit-transform
- -moz-transform
- -o-transform
不过在我的电脑上用transform效果相同，Chrome 49 Firefox 46 IE 10
一、旋转(rotate)
<!doctype html><html lang="en"><head> <meta charset="UTF-8"> <title>Document</title> <style> img:hover{ transform: rotate(90deg); } </style></head><body> <img src="/static/imghwm/default1.png" data-src="http://dl.bizhi.sogou.com/images/2012/03/23/107607.jpg?f=download" class="lazy" alt="CSS之Transform_html/css_WEB-ITnose" ></body></html> 语法格式如下：
rotate(angle)
旋转角度单位有：
- deg 指角度制,一周的角度是360°,直角是90°
- grad 指百分度制,一周的角度是400,直角是100
- turn 圈, 1turn代表旋转一圈
- rad 指弧度制,一周的角度是2π,直角是π/2
转换比例为： 90deg = 100grad = 0.25turn ≈ 1.570796326794897rad
二、缩放(scale)
<!doctype html><html lang="en"><head> <meta charset="UTF-8"> <title>Document</title> <style> img:hover{ transform: scale(1,-1) } </style></head><body> <img src="/static/imghwm/default1.png" data-src="http://dl.bizhi.sogou.com/images/2012/03/23/107607.jpg?f=download" class="lazy" alt="CSS之Transform_html/css_WEB-ITnose" ></body></html> 语法格式如下：
scale(number,[number2])
number2是可选的，如果未设置，则与默认与number相同。number可以为正数、负数、小数。
我们将number分为两部分，正负号(+,-)和数值(number的绝对值)。负号(-)意味着元素要被旋转180度，数值部分大于1则放大，小于一则缩小，等于一既不放大又不缩小，为零时消失。
三、移动(translate)
<!doctype html><html lang="en"><head> <meta charset="UTF-8"> <title>Document</title> <style> img:hover{ transform: translate(2in,5cm) } </style></head><body> <img src="/static/imghwm/default1.png" data-src="http://dl.bizhi.sogou.com/images/2012/03/23/107607.jpg?f=download" class="lazy" alt="CSS之Transform_html/css_WEB-ITnose" ></body></html> 语法格式如下：
translate(value1,[value2])
第一个参数表示相对于原位置X轴偏移距离，第二个参数表示相对于Y轴偏移个距离，如果省略了第二个参数，则默认为0。正数向右和下偏移，负数向左和上偏移。
距离的单位有：
- 绝对长度单位
- px
- in
- cm
- mm
- 相对字体长度单位
- em
- rem
- pt
- pc
- ex
- ch
- 可视区百分比长度单位
- vw
- vh
- vmin
- vmax
- 离奇的长度单位
- %(百分比)
关于这些长度单位，这有一篇很好的介绍链接http://www.w3cplus.com/css/the-lengths-of-css.html，本段也是参照此链接，不过提示大家，浏览器的版本也在不断的迭代，有些特性需要自己去验证，比如vmax属性在我的chrome浏览器下也行正常运行。
四、倾斜(skew)
<!doctype html><html lang="en"><head> <meta charset="UTF-8"> <title>Document</title> <style> img:hover{ transform: skew(30deg,-0.1turn) } </style></head><body> <img src="/static/imghwm/default1.png" data-src="http://dl.bizhi.sogou.com/images/2012/03/23/107607.jpg?f=download" class="lazy" alt="CSS之Transform_html/css_WEB-ITnose" ></body></html> 语法格式：
skew(angle,[angle])
第一个参数表示相对于X轴进行倾斜，第二个参数相对于Y轴进行倾斜，如果省略了第二个参数，则默认为0。
rotate函数只是旋转，不改变元素的形状，但skew函数会改变元素的形状。
五、变形
<!doctype html><html lang="en"><head> <meta charset="UTF-8"> <title>Document</title> <style> img:hover{ transform: matrix(1,0.4,0,1,0,0) } </style></head><body> <img src="/static/imghwm/default1.png" data-src="http://dl.bizhi.sogou.com/images/2012/03/23/107607.jpg?f=download" class="lazy" alt="CSS之Transform_html/css_WEB-ITnose" ></body></html> matrix()函数是一个3x3的矩阵，将旧的参数转换成新的参数。
目前，我对此也不是很了解，大家如有兴趣自行Google。
六、Transform-origin
CSS变形的原点默认是对象的中心点，如果要改变这个中心点，可以使用transform-origin属性进行定义。
<!doctype html><html lang="en"><head> <meta charset="UTF-8"> <title>Document</title> <style> img:hover{ /*以左上角为原点旋转*/ transform-origin: top left; transform: rotate(30deg); } </style></head><body> <img src="/static/imghwm/default1.png" data-src="http://dl.bizhi.sogou.com/images/2012/03/23/107607.jpg?f=download" class="lazy" alt="CSS之Transform_html/css_WEB-ITnose" ></body></html> 语法格式：
transform-origin:[ [
transform-origin属性的初始值是50%,50%，使用与块状元素和内联元素。transform-origin接受连个参数，他们可以是百分比、em、px等具体值也可以是left、center、right，或者top、middle、bottom等描述性关键字。
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