From 7ae2369dda35e9649bd5f12b3b91232a168e896e Mon Sep 17 00:00:00 2001
From: Simon Robertshaw <simon@hardwired.org.uk>
Date: Sun, 19 Aug 2012 11:30:44 +0100
Subject: Make ngrav negative, fixes #133


diff --git a/src/simulation/tools/NGrv.cpp b/src/simulation/tools/NGrv.cpp
index 7a097d5..525d697 100644
--- a/src/simulation/tools/NGrv.cpp
+++ b/src/simulation/tools/NGrv.cpp
@@ -11,7 +11,7 @@ Tool_NGrv::Tool_NGrv()
 
 int Tool_NGrv::Perform(Simulation * sim, Particle * cpart, int x, int y, float strength)
 {
-	sim->gravmap[((y/CELL)*(XRES/CELL))+(x/CELL)] += 0.03f*strength;
+	sim->gravmap[((y/CELL)*(XRES/CELL))+(x/CELL)] -= 0.03f*strength;
 	return 1;
 }
 
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