Modify the drawRectangle function so that it takes an RGB value and an optional Boolean value named fillOn as arguments. Its default fill value is False. If the fill value is True, the function should...

Modify the drawRectangle function so that it takes an RGB value and an optional Boolean value named fillOn as arguments. Its default fill value is False. If the fill value is True, the function should fill the rectangle in the given color. Describe the difference between Cartesian coordinates and screen coordinates.