src/math/aatriangle.cpp: Added forgotten new file.

This file should have been part of the previous commit, but I forgot to add it.

git-svn-id: http://supertux.lethargik.org/svn/supertux/trunk/supertux@6287 837edb03-e0f3-0310-88ca-d4d4e8b29345

diff --git a/src/math/aatriangle.cpp b/src/math/aatriangle.cpp
new file mode 100644 (file)
index 0000000..815e58d
--- /dev/null
+++ b/src/math/aatriangle.cpp
@@ -0,0 +1,38 @@
+//  $Id$
+//
+//  SuperTux
+//  Copyright (C) 2009 Matt McCutchen
+//
+//  This program is free software; you can redistribute it and/or
+//  modify it under the terms of the GNU General Public License
+//  as published by the Free Software Foundation; either version 2
+//  of the License, or (at your option) any later version.
+//
+//  This program is distributed in the hope that it will be useful,
+//  but WITHOUT ANY WARRANTY; without even the implied warranty of
+//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+//  GNU General Public License for more details.
+//
+//  You should have received a copy of the GNU General Public License
+//  along with this program; if not, write to the Free Software
+//  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+
+#include "aatriangle.hpp"
+
+int AATriangle::vertical_flip(int dir) {
+  int direction = dir & AATriangle::DIRECTION_MASK;
+  direction = 3 - direction;
+  int deform = dir & AATriangle::DEFORM_MASK;
+  switch (deform) {
+    case AATriangle::DEFORM1:
+      deform = AATriangle::DEFORM2;
+      break;
+    case AATriangle::DEFORM2:
+      deform = AATriangle::DEFORM1;
+      break;
+    default:
+      // unchanged
+      break;
+  }
+  return (direction | deform);
+}