1 files changed, 65 insertions, 0 deletions
diff --git a/src/imageplugins/perspective/triangle.cpp b/src/imageplugins/perspective/triangle.cpp
new file mode 100644
index 00000000..84f80a07
--- /dev/null
+++ b/src/imageplugins/perspective/triangle.cpp
@@ -0,0 +1,65 @@
+/* ============================================================
+ *
+ * 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.
+ * 
+ * ============================================================ */
+
+// C++ includes.
+
+#include <cstdio>
+#include <cstdlib>
+#include <cmath>
+
+// Local includes.
+
+#include "triangle.h"
+
+namespace DigikamPerspectiveImagesPlugin
+{
+
+Triangle::Triangle(TQPoint A, TQPoint B, TQPoint C)
+{
+    m_a = distanceP2P(B, C);
+    m_b = distanceP2P(A, C);
+    m_c = distanceP2P(A, B);
+}
+
+float Triangle::angleABC(void)
+{
+    return( 57.295779513082 * acos( (m_b*m_b - m_a*m_a - m_c*m_c ) / (-2*m_a*m_c ) ) );
+}
+
+float Triangle::angleACB(void)
+{
+    return( 57.295779513082 * acos( (m_c*m_c - m_a*m_a - m_b*m_b ) / (-2*m_a*m_b ) ) );
+}
+
+float Triangle::angleBAC(void)
+{
+    return( 57.295779513082 * acos( (m_a*m_a - m_b*m_b - m_c*m_c ) / (-2*m_b*m_c ) ) );
+}
+
+float Triangle::distanceP2P(const TQPoint& p1, const TQPoint& p2)
+{
+    return(sqrt( abs( p2.x()-p1.x() ) * abs( p2.x()-p1.x() ) +
+                 abs( p2.y()-p1.y() ) * abs( p2.y()-p1.y() ) ));
+}
+
+}  // NameSpace DigikamPerspectiveImagesPlugin