在 OS X App 中绘制四边形曲线

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 中看到以下方法 class,

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

有没有办法在OS X 环境下绘制四边形曲线？

Answer 1

呼叫path.addQuadCurve(to: endPoint, controlPoint: controlPoint), 代码如下

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 Rhythmic Fistman

在 OS X App 中绘制四边形曲线

Drawing Quad Curve in OS X App

macos

cocoa

core-graphics

objective-c