( Dev/Mouse )

%RTN { JMP2r }
%++  { #0001 ADD2 }
%--  { #0001 SUB2 }
%8+  { #0008 ADD2 }
%ABS2 { DUP2 #000f SFT2 #ffff SWP2 SWP POP MUL2? } 

;color { byte 1 }
;pointer { x 2 y 2 }
;circle { xc 2 yc 2 x 2 y 2 r 2 d 2 }

|0110 ;Screen { width 2 height 2 pad 4 x 2 y 2 color 1 }
|0120 ;Sprite { pad 8 x 2 y 2 addr 2 color 1 }
|0150 ;Mouse  { x 2 y 2 state 1 chord 1 }
|01F0 ;System { pad 8 r 2 g 2 b 2 }
|0200 ^RESET JMP
|0204 ,ERROR JMP2
|0208 ,FRAME JMP2

@RESET

	( theme ) #13fd =System.r #1ef3 =System.g #1bf2 =System.b
	
BRK

@FRAME
 	
 	( clear )
	~circle.xc ~circle.yc ~circle.r #00 ,draw-circle JSR2

	,draw-cursor JSR2

	~Mouse.state #00 EQU ^$no-touch JNZ
		~Mouse.x =circle.xc
		~Mouse.y =circle.yc
		#0000 =circle.r
	$no-touch

 	( draw )
	~circle.xc ~circle.yc ~circle.r #0001 ADD2 #03 ,draw-circle JSR2

BRK 

@draw-cursor ( -- )

	( clear last cursor )
	,clear_icn =Sprite.addr 
	~pointer.x =Sprite.x 
	~pointer.y =Sprite.y 
	#10 =Sprite.color

	( record pointer positions )
	~Mouse.x =pointer.x ~Mouse.y =pointer.y

	( draw new cursor )
	,cursor_icn =Sprite.addr 
	~pointer.x =Sprite.x 
	~pointer.y =Sprite.y 
	#11 ~Mouse.state #00 NEQ ADD =Sprite.color

RTN

@draw-circle ( xc yc r color )

	( load ) =color =circle.r =circle.yc =circle.xc
	#0000 =circle.x ~circle.r =circle.y
	~circle.r #0002 MUL2 #0003 SUB2 =circle.d
	( draw ) ,$seg JSR2
	$loop
		( incr ) ~circle.x ++ =circle.x
		~circle.d #0000 #0001 ADD2 LTS2 ^$else JNZ
			( decr ) ~circle.y -- =circle.y
			~circle.x ~circle.y SUB2 #0004 MUL2 ~circle.d ADD2 #000a ADD2 =circle.d
			,$end JMP2
		$else
			~circle.x #0004 MUL2 ~circle.d ADD2 #0006 ADD2 =circle.d
		$end
		( draw ) ,$seg JSR2
		~circle.y ~circle.x #0001 SUB2 GTS2 ^$loop JNZ
	RTN
	$seg
		~circle.xc ~circle.x ADD2 =Screen.x ~circle.yc ~circle.y ADD2 =Screen.y ~color =Screen.color
		~circle.xc ~circle.x SUB2 =Screen.x ~circle.yc ~circle.y ADD2 =Screen.y ~color =Screen.color
		~circle.xc ~circle.x ADD2 =Screen.x ~circle.yc ~circle.y SUB2 =Screen.y ~color =Screen.color
		~circle.xc ~circle.x SUB2 =Screen.x ~circle.yc ~circle.y SUB2 =Screen.y ~color =Screen.color
		~circle.xc ~circle.y ADD2 =Screen.x ~circle.yc ~circle.x ADD2 =Screen.y ~color =Screen.color
		~circle.xc ~circle.y SUB2 =Screen.x ~circle.yc ~circle.x ADD2 =Screen.y ~color =Screen.color
		~circle.xc ~circle.y ADD2 =Screen.x ~circle.yc ~circle.x SUB2 =Screen.y ~color =Screen.color
		~circle.xc ~circle.y SUB2 =Screen.x ~circle.yc ~circle.x SUB2 =Screen.y ~color =Screen.color

RTN

@ERROR BRK 

@clear_icn   [ 0000 0000 0000 0000 ]
@cursor_icn  [ 80c0 e0f0 f8e0 1000 ]