I think that I've written my ShapeGenerator class wrong, as now I come to use a transform on a shape, it will do so from the top left of the UIView created (the shape), rather than the centre:

            UIView.animate(withDuration: 0.7, animations: {
                shape.transform = CGAffineTransform(scaleX: 2.0, y: 2.0)
            }

line : 265 https://github.com/kwolk/GeometricBG/blob/master/GeometricBG/ViewController.swift

I found that setting the shape with a centre of half the radius (x and y) in the ShapeGenerator class (line: 64) would allow the transform method to sxpand from the centre, but then they always placed at the top left of the view.

What to do ?