diff --git a/ray/src/ray.tal b/ray/src/ray.tal
index ab4e75f..55eb8e1 100644
--- a/ray/src/ray.tal
+++ b/ray/src/ray.tal
@@ -33,6 +33,7 @@
 
 	( vectors )
 	;on-frame .Screen/vector DEO2
+	;on-mouse .Mouse/vector DEO2
 
 	#0060 .player/x STZ2
 	#0070 .player/y STZ2
@@ -47,6 +48,57 @@ BRK
 
 @on-frame ( -> )
 
+BRK
+
+@on-mouse ( -> )
+
+	;draw-viewport JSR2
+	;draw-minimap JSR2
+
+BRK
+
+(
+@|drawing )
+
+@draw-viewport ( -- )
+
+	#00 .Screen/auto DEO
+	#3c00
+	&h
+		#00 OVR #10 SFT2 #0090 ADD2 .Screen/x DEO2
+		#00 OVR .Mouse/x DEI2 ADD2 #003c DIV2k MUL2 SUB2 .player/a STZ2
+		( get distance ) ;cast JSR2 ;draw-col JSR2
+		INC GTHk ,&h JCN
+	POP2
+
+JMP2r
+
+@draw-col ( distance -- )
+
+	STH
+	#8000
+	&l
+		#00 OVR .Screen/y DEO2
+		DUP STHkr ;get-color JSR2 .Screen/pixel DEO
+		INC GTHk ,&l JCN
+	POP2
+	POPr
+
+JMP2r
+
+@get-color ( y distance -- color )
+
+	OVR #40 GTH ,&bottom JCN
+
+	#01 SFT GTH INC
+
+JMP2r
+	&bottom
+		#00 SWP SUB #01 SFT LTH INC
+		JMP2r
+
+@draw-minimap ( -- )
+
 	;draw-map JSR2
 
 	.Mouse/x DEI2 #003c DIV2k MUL2 SUB2 .player/a STZ2
@@ -54,18 +106,16 @@ BRK
 	.player/x LDZ2
 	.player/y LDZ2
 
-	#00 ;cast JSR2
+	[ #00 ;cast JSR2 ]
 		STH2k ;raycast JSR2
-
 		OVR2 .player/x LDZ2 STH2kr #01 SFT2 SUB2 ADD2
 		OVR2 .player/y LDZ2 STH2kr #01 SFT2 SUB2 ADD2 
 			;get-tile JSR2 #00 NEQ ,&color STR
-
 		SWP2 .player/x LDZ2 STH2kr #01 SFT2 SUB2 ADD2 SWP2
 		.player/y LDZ2 STH2r #01 SFT2 SUB2 ADD2
 		#02 [ LIT &color $1 ] ADD ;draw-line JSR2
 
-BRK
+JMP2r
 
 @cast ( -- range )