CODEWITHSUNDEEP
swiftmacoscocoadrawgeometry
Devid Otladka
Devid Otladka

Reputation: 53

Drawing a circle in Swift (MacOS)

I've found this code for drawing the line for MacOS app. 

 class Drawing: NSView {
        override func draw(_ dirtyRect: NSRect) {
            super.draw(dirtyRect)

            let context = NSGraphicsContext.current?.cgContext;

            context!.beginPath()
            context!.move(to: CGPoint(x: 0.0, y: 0.0))
            context!.addLine(to: CGPoint(x: 100.0, y: 100.0))
            context!.setStrokeColor(red: 1, green: 0, blue: 0, alpha: 1)
            context!.setLineWidth(1.0)
            context!.strokePath()
        }

override func viewDidLoad() {
        super.viewDidLoad()
let dr = Drawing(frame: NSRect(x: 0, y: 0, width: 100, height: 100))
        self.view.addSubview(dr)
}

How to change this code for circle? It's difficult for me to solve this problem. Help me, please.

Upvotes: 2

Views: 4813

Answers (2)

Tim Isenman
Tim Isenman

Reputation: 190

Depending on the side of the circle, you can also do this:

class YourParentView: NSView {

    // Create it as a view of its own
    let circleView = NSView()
    circleView.wantsLayer = true

    circleView.layer?.cornerRadius = 7 
    //depending on the size, adjust this
    //and that's it. Now it's a circle.

    //Then just addict the style
    circleView.layer?.backgroundColor = NSColor.green.cgColor
    circleView.layer?.borderColor = NSColor.white.cgColor

    //Be sure to add it to the parent view
    self.view.addSubview(circleView)
}

Upvotes: 2

vadian
vadian

Reputation: 285079

The circle equivalent is

class Drawing: NSView {
    override func draw(_ dirtyRect: NSRect) {
        super.draw(dirtyRect)

        let context = NSGraphicsContext.current!.cgContext
        context.saveGState()
        context.setFillColor(NSColor.red.cgColor)
        context.fillEllipse(in: dirtyRect)
        context.restoreGState()
    }   
}

or the classic NSBezierPath way

class Drawing: NSView {
    override func draw(_ dirtyRect: NSRect) {
        super.draw(dirtyRect)

        let fillColor = NSColor.red
        let path = NSBezierPath(ovalIn: dirtyRect)
        fillColor.setFill()
        path.fill()
    }
}

Upvotes: 9

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