( dev/mouse )

%RTN { JMP2r }
%8+  { #0008 ADD2 }
%++  { #0001 ADD2 }
%--  { #0001 SUB2 }
%ABS2 { DUP2 #000f SFT2 EQU #04 JNZ #ffff MUL2 }

( devices )

|00 @System     [ &vector $2 &pad     $6 &r      $2 &g     $2 &b      $2 ]
|10 @Console    [ &pad    $8 &char    $1 &byte   $1 &short $2 &string $2 ]
|20 @Screen     [ &vector $2 &width   $2 &height $2 &pad   $2 &x      $2 &y     $2 &addr $2 &color $1 ]
|40 @Controller [ &vector $2 &button  $1 &key    $1 ]
|60 @Mouse      [ &vector $2 &x       $2 &y      $2 &state $1 &chord $1 ]

|0000

@line    [ &x0 $2 &y0 $2 &x $2 &y $2 &sx $2 &sy $2 &dx $2 &dy $2 &e1 $2 &e2 $2 ]

@pointer [ &x $2 &y $2 &lastx $2 &lasty $2 &state $1 ]
@color $1

( program )

|0100 ( -> )

	( theme ) 
	#0ffd .System/r DEO2 
	#0f03 .System/g DEO2 
	#0f02 .System/b DEO2

	( vectors ) ;on-mouse .Mouse/vector DEO2

	#0010 #0030 #0050 #0070 #01 ;hairline JSR2
	#0000 #0000 #0020 #0090 #01 ;hairline JSR2

BRK

@on-mouse ( -> )

	;draw-cursor JSR2

	( on down )
	.Mouse/state DEI #00 NEQ 
	.pointer/state PEK #00 EQU
	#0101 EQU2 ,on-mouse-down JNZ

	( on drag )
	.Mouse/state DEI 
	#00 NEQ ,on-mouse-drag JNZ

	.Mouse/state DEI .pointer/state POK

BRK 

@on-mouse-down ( -> )

	( record last position )
	.Mouse/x DEI2 .pointer/x POK2 
	.Mouse/y DEI2 .pointer/y POK2

	.Mouse/x DEI2 .pointer/lastx POK2 
	.Mouse/y DEI2 .pointer/lasty POK2

	.Mouse/state DEI .pointer/state POK

BRK

@on-mouse-drag ( -> )
	
	.pointer/lastx PEK2 .pointer/lasty PEK2 .pointer/x PEK2 .pointer/y PEK2 #01 .Mouse/state DEI #10 EQU #02 MUL ADD ;hairline JSR2

	( record last position )
	.Mouse/x DEI2 .pointer/lastx POK2 
	.Mouse/y DEI2 .pointer/lasty POK2

	.Mouse/state DEI .pointer/state POK

BRK

@draw-cursor ( -- )
	
	( clear last cursor )
	;clear .Screen/addr DEO2 
	.pointer/x PEK2 .Screen/x DEO2 
	.pointer/y PEK2 .Screen/y DEO2 
	#30 .Screen/color DEO

	( record pointer positions )
	.Mouse/x DEI2 .pointer/x POK2 
	.Mouse/y DEI2 .pointer/y POK2

	( draw new cursor )
	;cursor .Screen/addr DEO2 
	.pointer/x PEK2 .Screen/x DEO2 
	.pointer/y PEK2 .Screen/y DEO2 

	( colorize on state )
	.Mouse/state DEI #00 NEQ
	#31 ADD .Screen/color DEO

RTN

@hairline ( x1 y1 x2 y2 color -- )
	
	( load ) .color POK .line/y0 POK2 .line/x0 POK2 .line/y POK2 .line/x POK2
	.line/x0 PEK2 .line/x PEK2 SUB2 ABS2 .line/dx POK2
	.line/y0 PEK2 .line/y PEK2 SUB2 ABS2 #0000 SWP2 SUB2 .line/dy POK2
	#ffff #00 .line/x PEK2 .line/x0 PEK2 LTS2 #0002 MUL2 ADD2 .line/sx POK2 
	#ffff #00 .line/y PEK2 .line/y0 PEK2 LTS2 #0002 MUL2 ADD2 .line/sy POK2 
	.line/dx PEK2 .line/dy PEK2 ADD2 .line/e1 POK2
	&loop
		.line/x PEK2 .Screen/x DEO2 .line/y PEK2 .Screen/y DEO2 .color PEK .Screen/color DEO
		.line/x PEK2 .line/x0 PEK2 EQU2 .line/y PEK2 .line/y0 PEK2 EQU2 #0101 EQU2 ,&end JNZ
		.line/e1 PEK2 #0002 MUL2 .line/e2 POK2
		.line/e2 PEK2 .line/dy PEK2 LTS2 ,&skipy JNZ
			.line/e1 PEK2 .line/dy PEK2 ADD2 .line/e1 POK2
			.line/x PEK2 .line/sx PEK2 ADD2 .line/x POK2
		&skipy
		.line/e2 PEK2 .line/dx PEK2 GTS2 ,&skipx JNZ
			.line/e1 PEK2 .line/dx PEK2 ADD2 .line/e1 POK2
			.line/y PEK2 .line/sy PEK2 ADD2 .line/y POK2
		&skipx
		,&loop JMP
	&end

RTN

@clear   [ 0000 0000 0000 0000 ]
@cursor  [ 80c0 e0f0 f8e0 1000 ]