From: Steinar H. Gunderson <sgunderson@bigfoot.com>
Date: Mon, 17 Sep 2012 11:39:07 +0000 (+0200)
Subject: Fix a problem with the normals.
X-Git-Url: https://git.sesse.net/?p=tcxmerge;a=commitdiff_plain;h=5e162abbf9da991f67661149b686714535e0fa1d;ds=sidebyside

Fix a problem with the normals.
---

diff --git a/opt.cc b/opt.cc
index bb318a4..87b632e 100644
--- a/opt.cc
+++ b/opt.cc
@@ -93,8 +93,8 @@ BSPTreeNode* make_bsp_tree(const vector<int>& remaining_roads)
 		const LineSegment& ls = roads[remaining_roads[i]];
 
 		// find the normal
-		double a = -(ls.to.x - ls.from.x);
-		double b =  ls.to.y - ls.from.y;
+		double a =   ls.to.y - ls.from.y;
+		double b = -(ls.to.x - ls.from.x);
 		double invlen = 1.0 / hypot(a, b);
 		a *= invlen, b *= invlen;