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[ctsim.git] / include / transformmatrix.h

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+/*****************************************************************************
+** FILE IDENTIFICATION
+**
+**      Name:         sgp.h
+**      Purpose:      Header file for Simple Graphics Package
+**      Author:       Kevin Rosenberg
+**      Date Started: 1984
+**
+**  This is part of the CTSim program
+**  Copyright (C) 1983-2000 Kevin Rosenberg
+**
+**  $Id: transformmatrix.h,v 1.1 2000/07/28 08:28:08 kevin Exp $
+**
+**  This program is free software; you can redistribute it and/or modify
+**  it under the terms of the GNU General Public License (version 2) as
+**  published by the Free Software Foundation.
+**
+**  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
+******************************************************************************/
+
+#ifndef __H_TRANSFORMMATRIX
+#define __H_TRANSFORMMATRIX
+
+class ostream;
+class TransformationMatrix2D {
+public:
+  double mtx[3][3];
+
+  TransformationMatrix2D () {};
+  TransformationMatrix2D (double m[3][3]);
+
+  void setIdentity();
+  void setTranslate (double x, double y);
+  void setScale (double sx, double sy);
+  void setShear (double shrx, double shry);
+  void setRotate (double theta);
+
+  double determinant () const;
+
+  const TransformationMatrix2D invert () const;
+
+  void transformPoint (double *pX, double *pY) const;
+
+  void print (ostream& ostr) const;
+
+  friend const TransformationMatrix2D operator* (const TransformationMatrix2D& lhs, const TransformationMatrix2D& rhs);
+
+};
+
+
+const TransformationMatrix2D  operator* (const TransformationMatrix2D& lhs, const TransformationMatrix2D& rhs);
+
+#endif