Igis Snippet: Clearing the Canvas Every Frame

Within these castle walls be forged Mavens of Computer Science ...

— Merlin, The Coder

func clearCanvas(canvas:Canvas) {
    if let canvasSize = canvas.canvasSize {
        let canvasRect = Rect(topLeft:Point(), size:canvasSize)
        let canvasClearRectangle = Rectangle(rect:canvasRect, fillMode:.clear)
        canvas.render(canvasClearRectangle)
    }
}

override func render(canvas:Canvas) {
    clearCanvas(canvas:canvas)
}