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* Copyright (C) 2007 Fabien Chereau
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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#ifndef _STELGRIDOBJECT_HPP_
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#define _STELGRIDOBJECT_HPP_
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#include "VecMath.hpp"
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//! Simple abstract class defining the method getPositionForGrid() used
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//! by the grid algorithms to get a permanent (fixed) position.
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virtual ~StelGridObject(void) {;}
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//! This method is used by the grid algorithms to get a permanent position for an object
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//! @return a unit vector giving a permanent direction in a 3d coordinate system.
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virtual Vec3d getPositionForGrid() const=0;
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#endif // _STELGRIDOBJECT_HPP_