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//-----------------------------------------------------------------------------
/** @file libboardgame_base/Transform.h
@author Markus Enzenberger
@copyright GNU General Public License version 3 or later */
//-----------------------------------------------------------------------------
#ifndef LIBBOARDGAME_BASE_TRANSFORM_H
#define LIBBOARDGAME_BASE_TRANSFORM_H
#include "CoordPoint.h"
namespace libboardgame_base {
//-----------------------------------------------------------------------------
/** Rotation and/or reflection of local coordinates on the board. */
class Transform
{
public:
virtual ~Transform();
virtual CoordPoint get_transformed(CoordPoint p) const = 0;
/** Get the new point type of the (0,0) coordinates.
The transformation may change the point type of the (0,0) coordinates.
For example, in the Blokus Trigon board, a reflection at the y axis
changes the type from 0 (=downside triangle) to 1 (=upside triangle).
@see Geometry::get_point_type() */
unsigned get_point_type() const { return m_point_type; }
/** @tparam I An iterator of a container with elements of type CoordPoint */
template<class I>
void transform(I begin, I end) const;
protected:
explicit Transform(unsigned point_type)
: m_point_type(point_type)
{}
private:
unsigned m_point_type;
};
template<class I>
void Transform::transform(I begin, I end) const
{
for (I i = begin; i != end; ++i)
*i = get_transformed(*i);
}
//-----------------------------------------------------------------------------
} // namespace libboardgame_base
#endif // LIBBOARDGAME_BASE_TRANSFORM_H
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