January 2020
Intermediate to advanced
356 pages
6h 4m
Chinese
Content preview from Swift游戏开发经典实例
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263
第 9 章
人工智能和行为
只有能够给玩家带来挑战的游戏才是真正的好游戏。有许多方法可以使游戏具有挑
战性，如复杂的解谜题目；但是真正的挑战应该是给玩家创建一个敌人，玩家必须
想尽一切办法，才能获得最终胜利，这会给玩家带来一种无法言喻的满足感，以及
那种只有经过努力才能获得的成就感。
本章，将介绍如何让对象移动
，如何让对象追逐和躲避目标，如何找到两点之间
的最短路径，以及如何设计一个有预判能力的人工智能系统。
9.1 Swift
使向量计算更轻松
问题
我们有一个
CGPoint
集合，我们想对它们进行
+
、
-
、
*
、
/
运
算。我们还想将
CGPoint
当成向量来用，并能够获得它们的长度或单位向量。
解决方案
利用
Swift
的运算符重载，让两个
CGPoint
或者一个
CGPoint
和一个标量（如
CGFloat
）进行运算：
/*
两个点相加
*/
func + (left: CGPoint, right : CGPoint) -> CGPoint {
return CGPoint(x: left.x + right.x, y: left.y + right.y)
}
264
｜
第
9
章
func - (left: CGPoint, right : CGPoint) -> CGPoint {
return CGPoint(x: ...
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