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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人工智能和行为
｜
271
9.6
目标选择问题
问题
我们想从多个目标中选择一个目标进行追逐。
解决方案
选择最优目标的一般算法步骤如下：
1.
将
bestScoreSoFar
设置为最恶劣的情况（要么
0
要么无限大，取决于你要搜寻
的目标是什么）。
2.
将
bestTargetSoFar
设为空。
3.
遍历每个可能的目标：
a.
计算每个目标的得分情况。
b.
如果该目标得分大于
bestScoreSoFar
：
i.
将该目标保存到
bestTargetSoFar
。
ii.
将该目标得分保存到
bestScoreSoFar
。
遍历结束，
bestTargetSoFar
保存的要么是搜索得到的最佳目标，要么为空。
上述步骤用代码实现后如下所示。
bestScoreSoFar
变量用
nearestNodeDistance
代
替；用它来保存搜索到的距离最近的目标，初始值为最大可能距离（即无限大）。
然后对所有可能的目标对象进行遍历，每当找到一个距离比它小的目标对象，就把
新目标的距离赋给它：
var nearestNodeDistance = CGFloat.infinity
var nearestNode : Critter? = nil
//
搜索最近的目标
scene?.enumerateChildNodes(withName: "Critter") { (node, stop) -> Void in
if let otherCritter = node as? Critter {
if otherCritter == ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.