Draw a filled box in image using specified coordinates.
ImageNum : The number of the image. You can use a number from 0 to 63 (included).
sx, sy : Coordinates of the top left point of the box.
ex, ey :Coordinates of the bottom right point of the box.
Color : The box filling color.
A boolean value. True if the operation succeeded. False is returned if the image doesn't existes or if the image number is out of bound.
To do.
// Listing #1: Todo.
To do