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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280
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第
9
章
from: startNode,
to: destinationNode
) as! [GKGridGraphNode]
//
打印路径
print("Path found:")
for point in path {
print(point.gridPosition)
}
讨论
虽然
A
星算法很有用，但知道如何利用
SDK
解决问题也很有用。
记住，当
findPath
无法找出路径时，它会返回
nil
。此外，它返回的是
GKGraphNode
数组，而不是
GKGridGraphNode
，你需要自己进行转换（就像我们在例子所做的那
样）。
9.11
计算下一步问题
问题
在回合制游戏中，我们想算出下一步棋该怎么下。
解决方案
对于不同的游戏，可能有无数种答案。在这里，我们只讨论此类问题的比较常见的
解决方案。
首先假设这个游戏的所有状态（棋子的位置、步数、每个游戏对象的状态），全部
都保存在内存里。
从当前状态开始，将下一个玩家有可能采取的动作都计算出来。对于每个可能的动
作，都创建一个动作执行后状态的拷贝。
然后，根据这个拷贝，计算得分。对于不同的游戏，用于计算得分的标准可能各有
不同，例如：
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