From 44dd6ad61dfed5d89f8abf7e8f41797501f071cc Mon Sep 17 00:00:00 2001
From: Sam Anthony <sam@samanthony.xyz>
Date: Wed, 25 Sep 2024 17:16:54 -0400
Subject: refactor graphics functions

---
 balls.c    | 34 ----------------------------------
 balls.h    |  4 ++++
 graphics.c | 35 +++++++++++++++++++++++++++++++++++
 mkfile     |  2 +-
 4 files changed, 40 insertions(+), 35 deletions(-)
 create mode 100644 graphics.c

diff --git a/balls.c b/balls.c
index d742d67..1a10e42 100644
--- a/balls.c
+++ b/balls.c
@@ -48,7 +48,6 @@ static Rectangle bounds = {{PAD, PAD}, {PAD+WIDTH, PAD+HEIGHT}};
 
 int init(char *label, Mousectl **mctl, Keyboardctl **kctl);
 void spawnball(void);
-void drawbg(Image *walls, Image *bg);
 void spawnballs(int n);
 Channel **allocchans(int nchans, int elsize, int nel);
 void mcopycolskip(Channel *vec[], Channel **matrix[], int n, int col, int skip);
@@ -57,8 +56,6 @@ void nooverlapcircles(Point centers[], int n);
 Point randptinrect(Rectangle r);
 int randint(int lo, int hi);
 void ball(void *arg);
-Image *alloccircle(int fg, int bg);
-void drawcircle(Image *m, Point pos);
 void broadcast(Point p, Channel *cs[], int n);
 void frametick(void *arg);
 
@@ -131,13 +128,6 @@ init(char *label, Mousectl **mctl, Keyboardctl **kctl) {
 	return 0;
 }
 
-void
-drawbg(Image *walls, Image *bg) {
-	draw(screen, screen->r, walls, nil, ZP);
-	draw(screen, screen->r, bg, nil, ZP);
-	flushimage(display, Refnone);
-}
-
 void
 spawnballs(int n) {
 	Channel **ticks;
@@ -314,30 +304,6 @@ ball(void *arg) {
 	}	
 }
 
-Image *
-alloccircle(int fg, int bg) {
-	Image *m, *fill
-;
-	m = allocimage(display, Rect(0, 0, 2*RADIUS, 2*RADIUS), RGBA32, 0, bg);
-	if (m == nil)
-		return nil;
-
-	fill = allocimage(display, Rect(0, 0, 1, 1), RGBA32, 1, fg);
-	if (fill == nil) {
-		free(m);
-		return nil;
-	}
-
-	fillellipse(m, Pt(RADIUS, RADIUS), RADIUS, RADIUS, fill, ZP);
-	freeimage(fill);
-	return m;
-}
-
-void
-drawcircle(Image *m, Point pos) {
-	draw(screen, rectaddpt(bounds, subpt(pos, Pt(RADIUS, RADIUS))), m, nil, ZP);
-}
-
 void
 broadcast(Point p, Channel *cs[], int n) {
 	while (n-- > 0)
diff --git a/balls.h b/balls.h
index 69adde9..0e98506 100644
--- a/balls.h
+++ b/balls.h
@@ -32,6 +32,10 @@ Point ptaddv(Point p, Vec v);
 Vec V(double x, double y);
 Vec Vpt(Point p, Point q);
 
+void drawbg(Image *walls, Image *bg);
+Image *alloccircle(int fg, int bg);
+void drawcircle(Image *m, Point pos);
+
 int iscollision(Point p, Point q);
 void collideball(Ball *b1, const Ball *b2);
 void collidewall(Ball *b, Rectangle wall);
diff --git a/graphics.c b/graphics.c
new file mode 100644
index 0000000..c03dc8e
--- /dev/null
+++ b/graphics.c
@@ -0,0 +1,35 @@
+#include "balls.h"
+
+void
+drawbg(Image *walls, Image *bg) {
+	draw(screen, screen->r, walls, nil, ZP);
+	draw(screen, screen->r, bg, nil, ZP);
+	flushimage(display, Refnone);
+}
+
+Image *
+alloccircle(int fg, int bg) {
+	Image *m, *fill;
+
+	m = allocimage(display, Rect(0, 0, 2*RADIUS, 2*RADIUS), RGBA32, 0, bg);
+	if (m == nil)
+		return nil;
+
+	fill = allocimage(display, Rect(0, 0, 1, 1), RGBA32, 1, fg);
+	if (fill == nil) {
+		free(m);
+		return nil;
+	}
+
+	fillellipse(m, Pt(RADIUS, RADIUS), RADIUS, RADIUS, fill, ZP);
+	freeimage(fill);
+	return m;
+}
+
+void
+drawcircle(Image *m, Point pos) {
+	Rectangle r;
+
+	r = Rpt(subpt(pos, Pt(RADIUS, RADIUS)), addpt(pos, Pt(RADIUS, RADIUS)));
+	draw(screen, r, m, nil, ZP);
+}
diff --git a/mkfile b/mkfile
index e43c880..ce0c5d8 100644
--- a/mkfile
+++ b/mkfile
@@ -3,7 +3,7 @@ LD=9l
 O=o
 LDFLAGS=
 
-OBJ = balls.$O vec.$O collision.$O
+OBJ = balls.$O vec.$O collision.$O graphics.$O
 
 balls: $OBJ
 	$LD -o balls $OBJ $LDFLAGS
-- 
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