uxn/examples/shapes.usm

( draw routines )

:dev/r fff8 ( std read port )
:dev/w fff9 ( std write port )

;color 1 ;x1 2 ;x2 2 ;y1 2 ;y2 2

|0100 @RESET

	#01 =dev/w ( set dev/write to screen ) 

	#01 =color
	#0010 #0020 #0040 #0060 ,fill-rect JSR
	#02 =color
	#0020 #0030 #0050 #0070 ,fill-rect JSR
	#03 =color
	#0030 #0040 #0060 #0080 ,fill-rect JSR

	#01 =color
	#0070 #0020 #00a0 #0060 ,line-rect JSR
	#02 =color
	#0080 #0030 #00b0 #0070 ,line-rect JSR
	#03 =color
	#0090 #0040 #00c0 #0080 ,line-rect JSR
	
BRK

@line-ver ( x1 y1 y2 )
	=y2 =y1 =x1 
	@line-ver-loop
		( draw ) ~x1 ~y1 IOW2 IOW2 ~color IOW
		( incr ) ~y1 #0001 ADD2 DUP2 =y1
		~y2 NEQ2 ,line-ver-loop ROT JMP? POP2
RTS

@line-hor ( x1 y1 x2 )
	=x2 =y1 =x1
	@line-hor-loop
		( draw ) ~x1 ~y1 IOW2 IOW2 ~color IOW
		( incr ) ~x1 #0001 ADD2 DUP2 =x1
		~x2 NEQ2 ,line-hor-loop ROT JMP? POP2
RTS

@line-rect ( x1 y1 x2 y2 )
	=y2 =x2 ( stash x1 y1 ) DUP2 WSR2 =y1 DUP2 WSR2 =x1
	@line-rect-hor
		( draw ) ~x1 ~y1 IOW2 IOW2 ~color IOW
		( draw ) ~x1 ~y2 IOW2 IOW2 ~color IOW
		( incr ) ~x1 #0001 ADD2 DUP2 =x1  
		~x2 #0001 ADD2 LTH2 ,line-rect-hor ROT JMP? POP2
	( restore x1 y1 ) RSW2 =x1 RSW2 =y1
	@line-rect-ver
		( incr ) ~y1 #0001 ADD2 DUP2 =y1  
		( draw ) ~x1 ~y1 IOW2 IOW2 ~color IOW
		( draw ) ~x2 ~y1 IOW2 IOW2 ~color IOW
		~y2 #0001 SUB2 LTH2 ,line-rect-ver ROT JMP? POP2
RTS

@fill-rect ( x1 y1 x2 y2 )
	=y2 =x2 ( stash x1 y1 ) =y1 DUP2 WSR2 =x1
	@fill-rect-ver
		RSW2 DUP2 =x1 WSR2
		@fill-rect-hor
			( draw ) ~x1 ~y1 IOW2 IOW2 ~color IOW
			( incr ) ~x1 #0001 ADD2 DUP2 =x1  
			~x2 LTH2 ,fill-rect-hor ROT JMP? POP2
		~y1 #0001 ADD2 DUP2 =y1
		~y2 LTH2 ,fill-rect-ver ROT JMP? POP2
	RSW2 POP2
RTS

|c000 @FRAME BRK 
|d000 @ERROR BRK 
|FFF0 [ 0f0f 0fff 0ff0 ] ( palette )
|FFFA .RESET .FRAME .ERROR ( vectors )