Question

我可以在iOS中使用UIBezierPath's方法addQuadCurveToPoint绘制四边形曲线，但无法在NSBezierPath中找到相同的方法。

我只能在NSBezierPath类中看到以下方法，

- moveToPoint:(NSPoint)point;
- lineToPoint:(NSPoint)point;
- curveToPoint:(NSPoint)endPoint
       controlPoint1:(NSPoint)controlPoint1
       controlPoint2:(NSPoint)controlPoint2;
- closePath;

有没有办法在OS X环境中绘制四边形曲线？

Answer 1

致电path.addQuadCurve(to: endPoint, controlPoint: controlPoint)，下面的代码

extension NSBezierPath{   
    func addQuadCurve(to endPoint: CGPoint, controlPoint: CGPoint){
        let startPoint = self.currentPoint
        let controlPoint1 = CGPoint(x: (startPoint.x + (controlPoint.x - startPoint.x) * 2.0/3.0), y: (startPoint.y + (controlPoint.y - startPoint.y) * 2.0/3.0))
        let controlPoint2 = CGPoint(x: (endPoint.x + (controlPoint.x - endPoint.x) * 2.0/3.0), y: (endPoint.y + (controlPoint.y - endPoint.y) * 2.0/3.0))
        curve(to: endPoint, controlPoint1: controlPoint1, controlPoint2: controlPoint2)
    }
}

感谢有节奏的拳头

在OS X App中绘制四条曲线

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