使用PHP 5.0创建图形的巧妙方法_php技巧
我将图形编辑程序分为两类：一类(是)绘图程序，利用这种程序可以一个像素一个像素(地)绘制图像；另外一类(是)制图程序，这种程序提供了一组对象，例如线、椭圆和矩形，您可以使用这些对象来组合成一幅大图像，例如 JPEG。绘图程序非常适合进行像素级(的)控制。但(是)对于业务图形来说，制图程序(是)比较好(的)方式，因为大部分图形都(是)由矩形、线和椭圆组成(的)。
PHP 内置(的)制图基本操作与绘图程序非常类似。它们对于绘制图像来说功能非常强大；但(是)如果您希望自己(的)图像(是)一组对象集合时，这(就)不太适合了。本文将向您展示如何在 PHP 图形库(的)基础上构建一个面向对象(的)图形库。您将使用 PHP V5 中提供(的)面向对象(的)扩展。
具有面向对象(的)图形支持之后，您(的)图形代码(就)非常容易理解和维护了。您可能还需要从一种单一(的)图形源将图形合成为多种类型(的)媒介：Flash 电影、SVG 等等。
目标
创建一个图形对象库包括 3 个主要(的)目标：
从基本操作切换到对象上
它不使用 imageline、imagefilledrectangle 以及其他图形函数，这个库应该提供一些对象，例如 Line、Rectangle 和 Oval，它们可以用来制作图像。它应该还可以支持构建更大(的)复杂对象或对对象进行分组(的)功能。
可以进行 z 值排序
制图程序让画家可以在画面表面上上下移动图形对象。这个库应该可以支持将一个对象放到其他对象前后(的)功能：它使用了一个 z 值，用来定义对象从制图平面开始(的)高度。z 值越大(的)对象被画(得)越晚，(也就)出现在那些 z 值较小(的)对象之上。
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