         self.backgroundColor = color
     }
 
+    public func background(_ r: CGFloat, _ g: CGFloat, _ b: CGFloat, _ a: CGFloat = 255) {
+        self.colorModel.background(r, g, b, a)
+    }
+
     public func clear() {
         self.colorModel.clear()
         self.background(UIColor.white)

        self.colorComponents.fill = color
    }

    func stroke(_ color: UIColor) {
        self.colorComponents.stroke = color
    }

    func strokeWeight(_ weight: CGFloat) {


protocol ColorModelContract {
    func background(_ color: UIColor)
    func background(_ r: CGFloat, _ g: CGFloat, _ b: CGFloat, _ a: CGFloat)
    func clear()
    func fill(_ color: UIColor)
    func fill(_ r: CGFloat, _ g: CGFloat, _ b: CGFloat, _ a: CGFloat)
    func stroke(_ color: UIColor)
    func stroke(_ r: CGFloat, _ g: CGFloat, _ b: CGFloat, _ a: CGFloat)
    func strokeWeight(_ weight: CGFloat)
    func noFill()
    func noStroke()
