NSBezierCurve没有绘制线条

Question

我尝试在NSImageView上绘图，如果我想画一个椭圆形，它就可以了。如果我尝试绘制一条线，它就会失败。为什么？ 我的对象声明：

class MyImgView: NSImageView {

var color = NSColor.greenColor()
var point1 = NSPoint()
var point2 = NSPoint()

init(frame: NSRect) {
    super.init(frame: frame)
    self.setNeedsDisplay()
    self.point1 = NSPoint(x: 0, y: 0)
    self.point2 = NSPoint(x: bounds.width, y:bounds.height)
}

init(coder aDecoder: NSCoder!)
{
    super.init(coder: aDecoder)
}

override func drawRect(dirtyRect: NSRect) {
    super.drawRect(dirtyRect)
    //var path = NSBezierPath(ovalInRect: dirtyRect)
    var path = NSBezierPath()
    path.lineWidth = 10
    path.moveToPoint(point1)
    path.lineToPoint(point2)
    color.setFill()
    path.fill()

}

}

Answer 1

因为path没有区域，只有一条线。 color.setFill()和path.fill()应为color.setStroke()和path.stroke()：

class MyImgView: NSImageView {

    var color = NSColor.greenColor()
    var point1 = NSPoint()
    var point2 = NSPoint()

    override init(frame: NSRect) {
        super.init(frame: frame)
        self.setNeedsDisplay()
        self.point1 = NSPoint(x: 0, y: 0)
        self.point2 = NSPoint(x: bounds.width, y:bounds.height)
    }

    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
    }

    override func drawRect(dirtyRect: NSRect) {
        super.drawRect(dirtyRect)
        //var path = NSBezierPath(ovalInRect: dirtyRect)
        var path = NSBezierPath()
        path.lineWidth = 10
        path.moveToPoint(point1)
        path.lineToPoint(point2)
        color.setStroke() // <-- HERE
        path.stroke() // <-- and HERE

    }
}