First Swift C4. Trying out the new animation system.

Workspace.swift

import UIKit

class WorkSpace: C4CanvasController {
    var circles : [C4Circle]!

    override func setup() {
        
        circles = [C4Circle]()
        
        for var i = 0; i < 10; i++
        {
            let x = random01() * canvas.width
            let y = random01() * canvas.height
            let p:C4Point = C4Point(x, y)
            let c = C4Circle(center:p, radius: 49)
            circles.append(c)
        }
        
        for circle in circles{
            canvas.add(circle)
        }
        
        C4ViewAnimation(duration: 5.0) {
            for circle in self.circles {
                circle.fillColor = black
            }
        }.animate()
    }
}