add vcglib

vcglib/vcg/math/similarity2.h

@@ -0,0 +1,60 @@
+/****************************************************************************
+* VCGLib                                                            o o     *
+* Visual and Computer Graphics Library                            o     o   *
+*                                                                _   O  _   *
+* Copyright(C) 2004-2016                                           \/)\/    *
+* Visual Computing Lab                                            /\/|      *
+* ISTI - Italian National Research Council                           |      *
+*                                                                    \      *
+* All rights reserved.                                                      *
+*                                                                           *
+* 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 (http://www.gnu.org/licenses/gpl.txt)          *
+* for more details.                                                         *
+*                                                                           *
+****************************************************************************/
+#ifndef __VCG_SIMILARITY2_H
+#define __VCG_SIMILARITY2_H
+namespace vcg
+{
+
+/*
+  This class codify a similarity transformation in 2D
+
+  The applied transformation is exactly the same of the Similarity class
+  Tra(Sca(Rot(P)))
+*/
+
+template <class SCALAR_TYPE>
+class Similarity2
+{
+public:
+  Similarity2():rotRad(0),tra(0,0),sca(1)  {}
+
+  SCALAR_TYPE rotRad;
+  Point2<SCALAR_TYPE> tra;
+  SCALAR_TYPE sca;
+};
+
+template <class SCALAR_TYPE>
+Point2<SCALAR_TYPE> operator*(const Similarity2<SCALAR_TYPE> &m, const Point2<SCALAR_TYPE> &p) {
+  Point2<SCALAR_TYPE> r = p;
+  // Apply Rotation to point
+  r.Rotate(m.rotRad);
+  r *= m.sca;
+  r += m.tra;
+  return r;
+}
+
+typedef Similarity2<float> Similarity2f;
+typedef Similarity2<double> Similarity2d;
+
+} // end namespace vcg
+#endif // __VCG_SIMILARITY2_H