Drawing primitives

gui/notepad/src/notepad.tal

@@ -10,7 +10,7 @@
 
 	@page $1
 	@collapsed $1
-	@selection &a $2 &b $2 &length $2
+	@selection &a $2 &b $2 &length $2 &sketch $1
 
 |100
 
@@ -18,9 +18,9 @@
 	( | meta )
 	;meta #06 DEO2
 	( | theme )
-	#f0cf .System/r DEO2
-	#f0cf .System/g DEO2
-	#f0cf .System/b DEO2
+	#f0ff .System/r DEO2
+	#f00f .System/g DEO2
+	#f00f .System/b DEO2
 	load-theme
 	( | size )
 	#00e0 .Screen/width DEO2
@@ -31,6 +31,7 @@
 	;on-frame .Screen/vector DEO2
 	;on-control .Controller/vector DEO2
 	( | let's go! )
+	#01 .selection/sketch STZ
 	file-init <draw-header>
 	#00 change-page BRK
 
@@ -100,6 +101,7 @@
 	&unchanged BRK
 
 @on-mouse-body ( -> )
+	.selection/sketch LDZ ?on-mouse-body-draw
 	[ LIT2 00 -Mouse/state ] DEI NEQ #41 ADD ;caret-icn <update-cursor>
 	<trap-mouse>
 	[ LIT &last $1 ] .Mouse/state DEI DUP #02 LTH ?{
@@ -110,6 +112,11 @@
 	,&last STR
 	POP BRK
 
+@on-mouse-body-draw ( -> )
+	[ LIT2 00 -Mouse/state ] DEI NEQ #41 ADD ;mouse-icn <update-cursor>
+	.Mouse/x DEI2 .Mouse/y DEI2 #0012 SUB2 #01 set-pixel <draw-sketch>
+	BRK
+
 @on-mouse-foot ( -> )
 	[ LIT2 00 -Mouse/state ] DEI NEQ #41 ADD ;mouse-icn <update-cursor>
 	<trap-mouse>
@@ -432,6 +439,30 @@
 		INC2 GTH2k ?&>l
 	&end NIP2 JMP2r
 
+(
+@|sketch )
+
+@get-row ( x* y* -- row* )
+	STH2k #03 SFT2 SWP2 #03 SFT2 SWP2 #001c MUL2 ADD2 #30 SFT2 STH2r #0007 AND2 ADD2 ;sketch ADD2 JMP2r
+
+@set-pixel ( x* y* color -- )
+	?add-pixel
+	( >> )
+
+@remove-pixel ( x* y* -- )
+	( keep x* ) OVR2 NIP #07 AND STH
+	( get byte ) get-row LDAk
+	( mask ) #0107 STHr SUB #40 SFT SFT #ff EOR AND
+	( save ) ROT ROT STA
+	JMP2r
+
+@add-pixel ( x* y* -- )
+	( keep x* ) OVR2 NIP #07 AND STH
+	( get byte ) get-row LDAk
+	( mask ) #0107 STHr SUB #40 SFT SFT ORA
+	( save ) ROT ROT STA
+	JMP2r
+
 (
 @|drawing )