From 845bdad1b405018437aeaa345de8d646c477a9e3 Mon Sep 17 00:00:00 2001
From: Vince Weaver <vincent.weaver@maine.edu>
Date: Thu, 1 Jul 2021 13:57:10 -0400
Subject: [PATCH] gr: thinking: have it scrolling

what to do about bottom of screen
---
 graphics/gr/thinking/thinking.s | 36 +++++++++++++++++++++++++++++++--
 1 file changed, 34 insertions(+), 2 deletions(-)

diff --git a/graphics/gr/thinking/thinking.s b/graphics/gr/thinking/thinking.s
index e6d53997..3a99f970 100644
--- a/graphics/gr/thinking/thinking.s
+++ b/graphics/gr/thinking/thinking.s
@@ -16,6 +16,7 @@ thinking:
 	jsr	SETGR		; set lo-res 40x40 mode
 				; A=$D0 afterward
 
+big_loop:
 
 	; COL value doesn't matter?
 
@@ -37,6 +38,11 @@ yloop:
 	txa
 	jsr	GBASCALC	; take Y-coord/2 in A, put address in GBASL/H ( a trashed, C clear)
 
+	lda	GBASH
+draw_page_smc:
+	adc	#0
+	sta	GBASH
+
 	lda	COL
 	and	#$7
 	tay
@@ -56,8 +62,6 @@ xloop:
 	inc	COL
 
 	inc	XSTART
-	inc	XSTART
-	dec	XSTOP
 	dec	XSTOP
 
 	inc	YSTART
@@ -66,6 +70,34 @@ xloop:
 	cmp	#10
 	bne	box_loop
 
+	;==========================
+	; done drawing rainbow box
+	;==========================
+
+flip_pages:
+
+	ldy	#1
+	lda	draw_page_smc+1	; DRAW_PAGE
+	bne	done_page
+	dey
+done_page:
+	ldx	PAGE1,Y		; set display page to PAGE1 or PAGE2
+
+	eor	#$4		; flip draw page between $400/$800
+	sta	draw_page_smc+1	; DRAW_PAGE
+
+
+
+	lda	#255
+	jsr	WAIT
+
+	;===================
+	; increment color
+	;	after loop we are +10
+	;	so -1 actually means increment 1 (because we mod 8 it)
+	dec	COL
+
+	jmp	big_loop
 
 
 ;0         1         2         3        3