2*M_PI Rotations not executing (visually)

[traviskirton]

Possible solution: look at animation groups to see if easing applies across all animations in the group. If so, then this is probably the best approach.

Here's an example that doesn't work:

import C4
import UIKit

class ViewController: C4CanvasController {
    var previous: C4Shape!
    override func setup() {
        for i in 1...20 {
            let s = C4Circle(center: canvas.center, radius: Double(50 - i * 2))
            s.anchorPoint = C4Point(0.5, 1.0)
            s.lineWidth = 0

            if i == 1 {
                s.center = canvas.center
                canvas.add(s)
            } else {
                s.center = previous.bounds.center
                previous.add(s)
            }
            previous = s

            var dir = 1.0
            if i % 2 == 0 {
                s.fillColor = C4Pink
                dir = -1.0
            }

            let a = C4ViewAnimation(duration: 0.25) {
                s.rotation += 2*M_PI
            }
            a.addCompletionObserver {
                a.animate()
            }
            a.animate()
        }
    }
}