1// $Id$
2//
3// SuperTux
4// Copyright (C) 2009 Matt McCutchen
5//
6// This program is free software; you can redistribute it and/or
7// modify it under the terms of the GNU General Public License
8// as published by the Free Software Foundation; either version 2
9// of the License, or (at your option) any later version.
10//
11// This program is distributed in the hope that it will be useful,
12// but WITHOUT ANY WARRANTY; without even the implied warranty of
13// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14// GNU General Public License for more details.
15//
16// You should have received a copy of the GNU General Public License
17// along with this program; if not, write to the Free Software
18// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
19
20#include "aatriangle.hpp"
21
22int AATriangle::vertical_flip(int dir) {
23 int direction = dir & AATriangle::DIRECTION_MASK;
24 direction = 3 - direction;
25 int deform = dir & AATriangle::DEFORM_MASK;
26 switch (deform) {
27 case AATriangle::DEFORM_BOTTOM:
28 deform = AATriangle::DEFORM_TOP;
29 break;
30 case AATriangle::DEFORM_TOP:
31 deform = AATriangle::DEFORM_BOTTOM;
32 break;
33 default:
34 // unchanged
35 break;
36 }
37 return (direction | deform);
38}
39
40/* EOF */
41