Swift... Clip to a Bezier Curve

Swift
1

my app contains this code

    public func drawPieSlice(_ rect:CGRect,startAngle:CGFloat,endAngle:CGFloat,fill:Bool=false) {
        let r = adjRect(rect)
        let center : CGPoint = CGPoint(x: r.midX,y: r.midY)
        let radius : CGFloat = min(r.width,r.height)/2
        
        let path = UIBezierPath(circleSegmentCenter: center, radius: radius, startAngle: startAngle, endAngle: endAngle)
        if fill==true {
            path.fill()
        } else {
            path.lineWidth = penSize
            path.stroke()
        }
    }

What I would like to add is the ability to “clip” to the created path, and draw lines for cross hatching inside the defined area. Any ideas?

2

I used a rect in xojo for Clipped Pies… many years ago :wink:

3

not sure how clipping to a rect is the same as clipping to a shape that is not a rect

4

maybe this ?

CGContextEOClip

sounds like it lets you modify the current clipping path with a new one

5

It should be so while the flexibility is needed for all dynamically changed graphics.

6

NSBeizerPath has a setClip function.

UIBezierPath has a addClip function which seems like it should do the same thing.

Failing that, you can get the CGPath, get the CGContext from the current NSGraphicsContext (or equivalent) and then use CGContextClipToPath

7

AddClip was what did it… thanks

8

You’re welcome.