From ebcdfd52ca5a725b35bf6cb7a6903377a5dca899 Mon Sep 17 00:00:00 2001
From: Werner Almesberger <werner@almesberger.net>
Date: Tue, 20 Mar 2012 19:18:08 -0300
Subject: [PATCH] cameo/area.c (hit_segment): clean up entry/exit handling

---
 cameo/area.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/cameo/area.c b/cameo/area.c
index 364f4a5..322f892 100644
--- a/cameo/area.c
+++ b/cameo/area.c
@@ -167,9 +167,8 @@ static int hit_segment(double fx, double fy, double tx, double ty,
 	dx = b->x-a->x;
 	dy = b->y-a->y;
 
-	if (enter && dy < 0)
-		return 0;
-	if (!enter && dy > 0)
+	/* -dy becomes the x component of the normal vector */
+	if (enter ? dy < 0 : dy > 0)
 		return 0;
 
 	d = hypot(dx, dy);