Draws a rectangle with the upper left corner (x1, y1) and the lower right corner (x2, y2) with the given value z.

Value	Function
0	Box clear (White)
1	Box set (Black)
2	Box clear (White)
4	Dotted Lines
5	Box inverts
5	Black Box with white corners (STD_RBOX)
10	Clear box area
11	Invert box area
11	Shade box area

For a better control of the design of the box modes z greater the 1000 can be used. These values are a sum of values for the parts of the box:

box element	value	form
inside area	0	unchanged
inside area	1	black
inside area	2	clear(white)
inside area	3	shade
inside area	5	reverse
border	0	nothing
border	10	black
border	20	clear(white)
border	30	dotted
border	50	inverse
shadow	0	nothing
shadow	100	black
shadow	200	clear(white)
shadow	300	dotted
shadow	500	inverse