From ddf4abf52eb6f9ee521de0f6f730a93e09aae2cb Mon Sep 17 00:00:00 2001
From: Travis Shears <t@travisshears.com>
Date: Mon, 30 Jun 2025 08:09:19 +0200
Subject: [PATCH] add cursor

---
 one_line_canvas.tal | 44 ++++++++++++++++++++++++++++++++++++++++----
 1 file changed, 40 insertions(+), 4 deletions(-)

diff --git a/one_line_canvas.tal b/one_line_canvas.tal
index cb95885..6b3f308 100644
--- a/one_line_canvas.tal
+++ b/one_line_canvas.tal
@@ -1,6 +1,8 @@
 |00 @System &vector $2 &expansion $2 &wst $1 &rst $1 &metadata $2 &r $2 &g $2 &b $2 &debug $1 &state $1
 |10 @Console &vector $2 &read $1 &pad $4 &type $1 &write $1 &error $1
 |20 @Screen &vector $2 &width $2 &height $2 &auto $1 &pad $1 &x $2 &y $2 &addr $2 &pixel $1 &sprite $1
+|90 @Mouse/vector $2 &x $2 &y $2 &state $5 &scrolly &scrolly-hb $1 &scrolly-lb $1
+
 
 
 |58 @canvas-width
@@ -10,16 +12,36 @@
 (to run debugger: `../uxn/bin/uxnasm one_line_canvas.tal one_line_canvas.rom && ../uxn/bin/uxnemu ../beetbug.rom ./one_line_canvas.rom`)
 %dbug  { #01 .System/debug DEO }
 %PX { #01 .Screen/pixel DEO }
+%ADD1 { #01 ADD }
 
 |0100
 @on-reset
 	setup-gui
-	#58 #58 #1f draw-h-line
-	#58 #58 #1f #02 MUL  draw-h-line
-	#1f #58 #1f  draw-v-line
-	#1f #02 #58 MUL #1f  draw-v-line
+	( draw canvas bounds )
+	.canvas-width ADD1 .canvas-width ADD1 .canvas-height ADD1 draw-h-line
+	.canvas-width ADD1 .canvas-width ADD1 .canvas-height ADD1 #02 MUL draw-h-line
+	.canvas-height ADD1 .canvas-width ADD1 .canvas-height ADD1 draw-v-line
+	.canvas-height ADD1 .canvas-width ADD1 #02 MUL .canvas-height ADD1 draw-v-line
+	;on-mouse .Mouse/vector DEO2
 	BRK
 
+@on-mouse ( -> )
+	.Mouse/x DEI2
+	.Mouse/y DEI2
+	draw-cursor
+	BRK
+
+@draw-cursor ( x* y* )
+	( clear fg )
+	LIT2 0000 .Screen/x DEO2
+	LIT2 0000 .Screen/y DEO2
+	#c0 .Screen/pixel DEO
+	( draw cursor sprite to fg )
+	.Screen/y DEO2 ( x* )
+    .Screen/x DEO2 ( )
+	;cursor-sprite .Screen/addr DEO2
+	#41 .Screen/sprite DEO
+
 @draw-v-line ( l x y )
     SWP ( l y x )
     #00 ( l y x 00 )
@@ -78,3 +100,17 @@
 	#f0d6 .System/g DEO2
 	#f0b2 .System/b DEO2
 	JMP2r
+
+
+@cursor-sprite
+	20 20 d8 20 20 00 00 00
+(
+. . # . . . . . 20
+. . # . . . . . 20
+# # . # # . . . d8
+. . # . . . . . 20
+. . # . . . . . 20
+. . . . . . . . 7e
+. . . . . . . . 3c
+. . . . . . . . 18
+)