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diff --git a/src/imageplugins/perspective/triangle.h b/src/imageplugins/perspective/triangle.h
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+/* ============================================================
+ *
+ * This file is a part of digiKam project
+ * http://www.digikam.org
+ *
+ * Date        : 2005-01-18
+ * Description : triangle geometry calculation class.
+ * 
+ * Copyright (C) 2005-2007 by Gilles Caulier <caulier dot gilles at gmail dot com>
+ * 
+ * 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, 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.
+ * 
+ * ============================================================ */
+
+#ifndef TRIANGLE_H
+#define TRIANGLE_H
+
+// TQt includes.
+
+#include <tqpoint.h>
+
+namespace DigikamPerspectiveImagesPlugin
+{
+
+class Triangle
+{
+
+public:
+
+    Triangle(TQPoint A, TQPoint B, TQPoint C);
+    ~Triangle(){};
+    
+    float angleABC(void);
+    float angleACB(void);
+    float angleBAC(void);
+    
+private:  
+    
+    float  m_a;
+    float  m_b;
+    float  m_c;
+        
+    float distanceP2P(const TQPoint& p1, const TQPoint& p2);
+};
+
+}  // NameSpace DigikamPerspectiveImagesPlugin
+
+#endif /* TRIANGLE_H */