php设计模式之享元模式分析【星际争霸游戏案例】

<?php
 //机枪兵享元
 class MarineFlyweight
 {
  //绘制机枪兵的图像动画，参数为状态，比如属于哪一个玩家
  public function drawMarine($state)
  {
   //绘制机枪兵
  }
 }

 //享元工厂
 class FlyweightFactory
 {
  //享元数组，用于存放多个享元
  private $flyweights;

  //获取享元的方法
  public function getFlyweight($name)
  {
   if (!isset($flyweights[$name]))
   {
    $flyweights[$name] = new $name."Flyweight";
   }
   return $flyweights[$name];
  }
 }

 //初始化享元工厂
 $flyweightFactory = new FlyweightFactory();

 //当我们需要绘制一个机枪兵的时候，同时传递一个状态数组，里面包含剩余的血等等
 $marine = $flyweightFactory->getFlyweight("Marine");
 $marine->drawMarine($status);
?>