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diff --git a/lsystem3d/src/callbacks.h b/lsystem3d/src/callbacks.h
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+// Copyright (C) 2006 Erik Dahlberg
+// 
+// This file is part of LSystem3d.
+// 
+// LSystem3D 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.
+// 
+// LSystem3D 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 LSystem3D; if not, write to the Free Software
+// Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+
+
+
+
+#ifndef CALLBACKS_H
+#define CALLBACKS_H
+
+
+
+// GLUT callback functions
+// -----------------------
+
+/**
+ * Key press
+ * @param key the key
+ * @param x mouse x-coordinate
+ * @param y mouse y-coordinate
+ */
+void glutKeyboardCB(unsigned char key, int x, int y);
+
+/**
+ * Special key press
+ * @param key the key
+ * @param x mouse x-coordinate
+ * @param y mouse y-coordinate
+ */
+void glutSpecialCB(int key, int x, int y);
+
+/**
+ * Redraw of screen
+ */
+void glutDisplayCB();
+
+/**
+ * Idling
+ */
+void glutIdleCB();
+
+
+
+// GLUI callback functions
+// -----------------------
+
+/**
+ * Angle changes
+ * @param id not used
+ */
+void gluiSpinnerAngleCB(int id);
+
+/**
+ * Reset button pressed
+ * @param id not used
+ */
+void gluiButtonResetCB(int id);
+
+/**
+ * Generate button pressed
+ * @param id not used
+ */
+void gluiButtonGenerateCB(int id);
+
+
+
+#endif