用 Texvc 生成数学公式
is-Programmer 目前用 l2p 这个小程序，配合 TeX 系统来生成数学公式图片，现在又有新的选择了，那就是 Texvc ～ 
texvc 是 MediaWiki 附带的用来生成公式图片的小程序，在 MediaWiki 安装路径下的 Math 目录中可以找到这个程序，和 l2p 一样，需要配置好 TeX 环境。
genki 写了一个简单的 texvc 的 Ruby wrapper，这样在 ruby 中就可以方便的生成公式图片了～
首先安装，gem 包名称叫做 genki-texvc：
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sudo gem install genki-texvc
使用方法非常简单：
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require 'texvc'
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Texvc.parse( 'f(x)=\int_0^x \sin(t)\,dt' ) #=> Magick::Image
就会生成：
parse 之后会返回一个 Magick::Image 实例，你可以显示出来，或者写到文件中，或者再做进一步处理～
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