aabb_2d_transformation_2d.h

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/** @file
 *  @author Bram de Greve (bram@cocamware.com)
 *  @author Tom De Muer (tom@cocamware.com)
 *
 *  *** BEGIN LICENSE INFORMATION ***
 *  
 *  The contents of this file are subject to the Common Public Attribution License 
 *  Version 1.0 (the "License"); you may not use this file except in compliance with 
 *  the License. You may obtain a copy of the License at 
 *  http://lass.sourceforge.net/cpal-license. The License is based on the 
 *  Mozilla Public License Version 1.1 but Sections 14 and 15 have been added to cover 
 *  use of software over a computer network and provide for limited attribution for 
 *  the Original Developer. In addition, Exhibit A has been modified to be consistent 
 *  with Exhibit B.
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 *  Software distributed under the License is distributed on an "AS IS" basis, WITHOUT 
 *  WARRANTY OF ANY KIND, either express or implied. See the License for the specific 
 *  language governing rights and limitations under the License.
 *  
 *  The Original Code is LASS - Library of Assembled Shared Sources.
 *  
 *  The Initial Developer of the Original Code is Bram de Greve and Tom De Muer.
 *  The Original Developer is the Initial Developer.
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 *  Copyright (C) 2004-2011 the Initial Developer.
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#ifndef LASS_GUARDIAN_OF_INCLUSION_PRIM_AABB_2D_TRANSFORMATION_2D_H
#define LASS_GUARDIAN_OF_INCLUSION_PRIM_AABB_2D_TRANSFORMATION_2D_H
 
#include "prim_common.h"
#include "aabb_2d.h"
#include "transformation_2d.h"
 
namespace lass
{
 
namespace prim
{
 
/** apply transformation to axis aligned bounding box
 *  @relates Transformation3D
 */
template<typename T, class MMP>
Aabb2D<T, MMP> transform(const Aabb2D<T, MMP>& subject, const Transformation2D<T>& transformation)
{
    typedef Aabb2D<T, MMP> TAabb;
    typedef typename TAabb::TPoint TPoint;
    typedef typename TAabb::TVector TVector;
 
    if (subject.isEmpty())
    {
        return subject;
    }
 
    const TVector delta = subject.size();
    const TPoint p0 = transform(subject.min(), transformation);
    const TPoint px = p0 + transform(TVector(delta.x, 0), transformation);
    const TVector dy = transform(TVector(0, delta.y), transformation);
 
    TAabb result = Aabb2D<T, AutoMinMax>(p0, px);
    result += (p0 + dy);
    result += (px + dy);
    return result;
}
 
}
 
}
 
#endif
 
// EOF