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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274
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第
9
章
func findPotentialCover(steps : Int, distance : CGFloat) -> [CGPoint] {
//
初始化空数组
var coverPoints : [CGPoint] = []
//
在对象四周画一个圈，将这个圆等分成
steps
份，
//
每次取等分点上的那一点来进行扫描
for coverPoint in 0..<steps {
//
计算当前扫描到的角度（等分点）
let angle = Float(.pi * 2.0) * (Float(coverPoint) / Float(steps))
//
算出当前角度到达指定距离（
distance
）处的点
let potentialPoint = CGPoint(angleRadians: CGFloat(angle)) * distance
//
判断从这里到那里（
potentialPoint
）之间是否存在物体
if self.scene?.physicsWorld.body(alongRayStart: self.position,
end: potentialPoint) != nil {
//
如果有，
//
将这个点加到列表中
coverPoints.append(potentialPoint)
}
}
//
返回所找到的所有隐蔽点 ...
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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.