Image Rendering swift

Asked Jul 11 '18 at 19:40

Active Jul 11 '18 at 20:11

Viewed 241 times

I am rendering an a lines on UIView. Problem is when I zoom in view, it gets blurred. I want to maintain the clarity while its getting zoom. Can this be achievable through rendering image in background? If yes then how? I am stuck at this part.[ When zoomed[1]

below is code for drawing lines :

 override  func draw(_ rect: CGRect)
    {
        let shape = CAShapeLayer()
        self.layer.addSublayer(shape)
        shape.fillColor = UIColor.black.cgColor
        shape.strokeColor = UIColor.white.cgColor
        let path = CGMutablePath()
        for stroke in strokePoints
        {
            //print(stroke.startPoint,stroke.endPoint)
            path.move(to: stroke.startPoint)
            path.addLine(to: stroke.endPoint)
        }
        shape.path = path
    }

edited Jul 11 '18 at 20:11

asked Jul 11 '18 at 19:40

blueWings

Could you post your code on how you draw the lines in the view? – Dalton Sweeney Jul 11 '18 at 19:45
Edited the question. Please check – blueWings Jul 11 '18 at 19:54
What do you mean when you say you "zoom" the view? – Dalton Sweeney Jul 11 '18 at 20:00
I mean to say , when I zoom in the drawing which is on the view, its not clear – blueWings Jul 11 '18 at 20:11
You should definitely not use draw(_ rect:) to do that. – Vin Gazoil Jul 11 '18 at 21:22
@VinGazoil am I missing something in drawing lines?? Could you please suggest document or links to look up on – blueWings Jul 12 '18 at 13:06
1

@blueWings The problem with your code is that it will add a sublayer to your layer every time the method gets called. Moreover, `DrawRect(_ rect:)` should only be used for actual drawing (take a look at https://stackoverflow.com/questions/14659563/to-drawrect-or-not-to-drawrect-when-should-one-use-drawrect-core-graphics-vs-su] for more informations). – Vin Gazoil Jul 12 '18 at 13:15
@VinGazoil thank you. Appreciated – blueWings Jul 12 '18 at 20:30

Image Rendering swift

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