Points and Rectangles

The Co-ordinate System:

• Specify points with pt(x,y)
• Specify rectangles with rect(x,y,width,height)
• The co-ordinate (0,0) is at the top left of the window or drawing area:

Using Points and Rectangles:

• Find the rectangle of a control with r = get_control_area(c)
• Find the rectangle of a window with r = get_window_area(w)
• Inset a rectangle with r2 = inset_rect(r,1)
• Center a rectangle on another with r3 = center_rect(r1,r2)
• Are two rectangles equal? rects_equal(r1,r2)
• Are two points equal? points_equal(p1,p2)
• Is a point inside a rect? point_in_rect(p,r)