let color = Color(red: 1.0, green: 0.0, blue: 0.0, alpha: 1.0)

var red, green, blue: Shape!

override func setup() {
    setupShapes()
    setupLabels()

    red.fillColor   = Color(red: 1.0, green: 0.0, blue: 0.0, alpha: 1.0)
    green.fillColor = Color(red: 0.0, green: 1.0, blue: 0.0, alpha: 1.0)
    blue.fillColor  = Color(red: 0.0, green: 0.0, blue: 1.0, alpha: 1.0)
}

func setupShapes() {
    let frame = Rect(0, 0, canvas.width*0.9, canvas.height/5)

    red =  Rectangle(frame: frame)
    green = Rectangle(frame: frame)
    blue = Rectangle(frame: frame)

    red.lineWidth = 0.0
    green.lineWidth = 0.0
    blue.lineWidth = 0.0

    let dy = Vector(x: 0, y: canvas.height/4)
    red.center  = canvas.center - dy
    green.center = canvas.center
    blue.center = canvas.center + dy

    canvas.add(red)
    canvas.add(green)
    canvas.add(blue)
}

func setupLabels() {
    let f = Font(name: "Helvetica", size: 30.0)!
    var l = TextShape(text: "{RGBA} : {1.0, 0, 0, 1.0}", font: f)!
    l.fillColor = white
    l.center = red.center
    canvas.add(l)

    l = TextShape(text: "{RGBA} : {0, 1.0, 0, 1.0}", font: f)!
    l.fillColor = white
    l.center = green.center
    canvas.add(l)

    l = TextShape(text: "{RGBA} : {0, 0, 1.0, 1.0}", font: f)!
    l.fillColor = white
    l.center = blue.center
    canvas.add(l)
}