不可移动的断点

Question

我是Swift的新手，并尝试编写一个用于矢量计算的litte命令行工具。当我运行它时，程序被中断并显示绿线。我试过了，但无法摆脱它。你有什么想法？ mormod

func isLineParallelTo(l: Line) -> Bool{
    if(self.directionVector.isLinearlyDependentTo(v: l.directionVector)){
        let pointToTest = Point(name: "p", x: l.positionVector.x, y: l.positionVector.y, z: l.positionVector.z)
        //println("\(pointToTest.displayPoint())")
        println("\(self.isPointOnLine(pointToTest))") //says false
        let b:Bool = self.isPointOnLine(pointToTest)
        if(b){ //Thread 1: breakpoint 1.1
            return false
        }
        else{
            return true
        }
    }
    else{
        return false
    }
}

整个代码（行）

import Foundation

class Line {
let name: String
let positionVector: Vector
let directionVector: Vector

func isPointOnLine(p: Point) -> Bool{
    let pv = Vector(name: "pv", x: p.x, y: p.y, z: p.z)
    let pvMinusPosition = Vector(name: "pvMinusPosition", x: pv.x-self.positionVector.x, y: pv.y-self.positionVector.y, z: pv.z-self.positionVector.z)
    if(pvMinusPosition.isLinearlyDependentTo(v: directionVector)){
        return true
    }
    else{
        return false;
    }
}

//TODO: are lines parallel?
func isLineParallelTo(l: Line) -> Bool{
    if(self.directionVector.isLinearlyDependentTo(v: l.directionVector)){
        let pointToTest = Point(name: "p", x: l.positionVector.x, y: l.positionVector.y, z: l.positionVector.z)
        println("\(pointToTest.displayPoint())")
        println("\(self.isPointOnLine(pointToTest))")
        let b:Bool = self.isPointOnLine(pointToTest)
        if(b){
            return false
        }
        else{
            return true
        }
    }
    else{
        return false
    }
}
//TODO: are lines equal?
//TODO: are lines 'windschief'?

init(name: String, position positionVector: Vector, direction       directionVector: Vector){
    self.name = name;
    self.positionVector = positionVector;
    self.directionVector = directionVector;
}
}