ClearRect

This function clears a section of the screen to white and exits with COLOR=COLOR_NORMAL. All parameters are in pixels. (0,0) is the upper-left corner of the screen.

         int x                Horizontal location of upper left corner of cleared area. 
         int y                Vertical location of upper left corner of cleared area.  
         int w                Width of cleared area.  
         int h                Height of cleared area.