From f3d86c5384e3a50636417383cb1b0d2dde92e0c7 Mon Sep 17 00:00:00 2001
From: Devine Lu Linvega <aliceffekt@gmail.com>
Date: Sun, 21 Jan 2024 08:58:34 -0800
Subject: [PATCH] (hilbert) Cache last pos

---
 projects/examples/demos/hilbert.tal | 34 +++++++++++++++++++----------
 1 file changed, 22 insertions(+), 12 deletions(-)

diff --git a/projects/examples/demos/hilbert.tal b/projects/examples/demos/hilbert.tal
index dc7f866..0f08a8c 100644
--- a/projects/examples/demos/hilbert.tal
+++ b/projects/examples/demos/hilbert.tal
@@ -12,13 +12,21 @@
 	#00c0
 	( ) DUP2 .Screen/width DEO2
 	( ) .Screen/height DEO2
+	( | pen )
+	#0020
+	( ) DUP2 .Screen/x DEO2
+	.Screen/y DEO2
 	( | vector )
 	;on-frame .Screen/vector DEO2
 	BRK
 
 @on-frame ( -> )
-	[ LIT2 &f $2 ] STH2k INC2 DUP2 ,&f STR2
-	d2xy STH2r d2xy #01 <draw-line>
+	[ LIT2 &x1 0020 ] [ LIT2 &y1 0020 ]
+	( ) [ LIT2 &f $2 ] INC2 DUP2 ,&f STR2
+	d2xy
+	( ) DUP2 ,&y1 STR2
+	( ) OVR2 ,&x1 STR2
+	#01 <draw-line>
 	BRK
 
 @d2xy ( d* -- x* y* )
@@ -26,16 +34,18 @@
 	#0000
 	( ) DUP2 ,&x STR2
 	( ) ,&y STR2
-	#2001 &l #00 OVR STH2
-	[ LIT2 &t $2 ]
-	( ) DUP2 DUP2 #01 SFT2 #0001 AND2 DUP2 ,&rx STR2
-	( ) EOR2 #0001 AND2 ,&ry STR2
-	( ) #02 SFT2 ,&t STR2
-	[ LIT2 &x $2 ] [ LIT2 &y $2 ] [ LIT2 &rx $2 ] [ LIT2 &ry $2 ]
-	( ) STH2kr rot
-	( ) STH2kr ,&ry LDR2 MUL2 ADD2 ,&y STR2
-	( ) STH2r ,&rx LDR2 MUL2 ADD2 ,&x STR2
-	DUP ADD GTHk ?&l
+	#2001
+	&l ( -- )
+		#00 OVR STH2
+		[ LIT2 &t $2 ]
+		( ) DUP2 DUP2 #01 SFT2 #0001 AND2 DUP2 ,&rx STR2
+		( ) EOR2 #0001 AND2 ,&ry STR2
+		( ) #02 SFT2 ,&t STR2
+		[ LIT2 &x $2 ] [ LIT2 &y $2 ] [ LIT2 &rx $2 ] [ LIT2 &ry $2 ]
+		( ) STH2kr rot
+		( ) STH2kr ,&ry LDR2 MUL2 ADD2 ,&y STR2
+		( ) STH2r ,&rx LDR2 MUL2 ADD2 ,&x STR2
+		DUP ADD GTHk ?&l
 	POP2
 	( ) ,&x LDR2 #20 SFT2 #0020 ADD2
 	( ) ,&y LDR2 #20 SFT2 #0020 ADD2 JMP2r