判断一个坐标点是否在封闭曲线内的方法(swift)

//用playground运行即可
import UIKit

var str = "Hello, playground"

let lTestPointsOne : [(Double, Double)]  = [(0,0)]
let lTestPoints : [(Double, Double)]  = [(0,0),(0,1),(1,1)]
let lPoints : [(Double, Double)]  = [(0,0),(0,1),(1,2),(2,1),(3,2),(3,0)]

func judgeIf(point:(Double,Double), isIn pointArr:[(Double, Double)])->Bool{
    if 0 == pointArr.count {
        return false
    }
    let lPath = UIBezierPath.init()
    let l1stPoint = pointArr.first
    lPath.move(to: CGPoint.init(x: l1stPoint!.0, y: l1stPoint!.1))
    
    for i in 1..<pointArr.count {
        let lP = pointArr[i]
        lPath.addLine(to: CGPoint.init(x: lP.0, y: lP.1))
    }
    
    lPath.close()
    return lPath.contains(CGPoint.init(x: point.0, y: point.1))
}

print(lPoints)
judgeIf(point: (0,0), isIn: lPoints)
judgeIf(point: (1,0), isIn: lPoints)
judgeIf(point: (3,-1), isIn: lPoints)
judgeIf(point: (0.5,2), isIn: lPoints)
judgeIf(point: (1,1), isIn: lPoints)
judgeIf(point: (2,1), isIn: lPoints)
judgeIf(point: (2,0.5), isIn: lPoints)
judgeIf(point: (2,1.5), isIn: lPoints)
judgeIf(point: (3,1), isIn: lPoints)
judgeIf(point: (3.3,8.1), isIn: lPoints)

judgeIf(point: (0,0), isIn: lTestPoints)
judgeIf(point: (0,1), isIn: lTestPoints)
judgeIf(point: (0.5,0.5), isIn: lTestPoints)
judgeIf(point: (0.5,0.7), isIn: lTestPoints)
judgeIf(point: (0.5,0.1), isIn: lTestPoints)
judgeIf(point: (0,8), isIn: lTestPoints)
judgeIf(point: (1,0), isIn: lTestPoints)

judgeIf(point: (1,0), isIn: lTestPointsOne)
judgeIf(point: (0,0), isIn: lTestPointsOne)