C4Blue
C4Grey
C4Pink
C4Purple

override func setup() {
    let dy = Vector(x: 0, y: canvas.height/5)

    var frame = Rect(Point(), Size(canvas.width * 0.9, canvas.height/6))
    frame.center = Point(canvas.center.x, dy.y)

    let blue = generateRect(frame, text: "C4Blue")
    canvas.add(blue)

    frame.center += dy
    let pink = generateRect(frame, text: "C4Pink")
    pink.fillColor = C4Pink

    frame.center += dy
    let purple = generateRect(frame, text: "C4Purple")
    purple.fillColor = C4Purple

    frame.center += dy
    let gray = generateRect(frame, text: "C4Grey")
    gray.fillColor = C4Grey
}

func generateRect(frame: Rect, text: String) -> Rectangle {
    let rect = Rectangle(frame: frame)
    canvas.add(rect)
    let label = TextShape(text: text, font: Font(name: "Helvetica", size: 20)!)!

    label.fillColor = text == "C4Grey" ? C4Purple : C4Grey

    label.center = rect.bounds.center
    rect.add(label)
    return rect
}