BVHBoundingBoxVisitor.hxx

// Copyright (C) 2008 - 2009  Mathias Froehlich - Mathias.Froehlich@web.de
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Library General Public
// License as published by the Free Software Foundation; either
// version 2 of the License, or (at your option) any later version.
//
// This library 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
// Library 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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
//

#ifndef BVHBoundingBoxVisitor_hxx
#define BVHBoundingBoxVisitor_hxx

#include <simgear/math/SGGeometry.hxx>

#include "BVHVisitor.hxx"
#include "BVHNode.hxx"
#include "BVHGroup.hxx"
#include "BVHTransform.hxx"
#include "BVHMotionTransform.hxx"
#include "BVHLineGeometry.hxx"

#include "BVHStaticData.hxx"

#include "BVHStaticNode.hxx"
#include "BVHStaticTriangle.hxx"
#include "BVHStaticBinary.hxx"
#include "BVHStaticGeometry.hxx"

namespace simgear {

class BVHBoundingBoxVisitor : public BVHVisitor {
public:
    virtual ~BVHBoundingBoxVisitor() {}
    
    void clear()
    { _box.clear(); }
    
    virtual void apply(BVHGroup& node)
    { expandBy(node.getBoundingSphere()); }
    virtual void apply(BVHTransform& node)
    { expandBy(node.getBoundingSphere()); }
    virtual void apply(BVHMotionTransform& node)
    { expandBy(node.getBoundingSphere()); }
    virtual void apply(BVHLineGeometry& node)
    { expandBy(node.getBoundingSphere()); }
    virtual void apply(BVHStaticGeometry& node)
    { expandBy(node.getBoundingSphere()); }
    
    virtual void apply(const BVHStaticBinary& node, const BVHStaticData& data)
    { expandBy(node.getBoundingBox()); }
    virtual void apply(const BVHStaticTriangle& node, const BVHStaticData& data)
    { expandBy(node.computeBoundingBox(data)); }
    
    const SGBoxf& getBox() const
    { return _box; }
    
private:
    void expandBy(const SGSphered& sphere)
    {
        SGVec3f v0(sphere.getCenter() - sphere.getRadius()*SGVec3d(1, 1, 1));
        SGVec3f v1(sphere.getCenter() + sphere.getRadius()*SGVec3d(1, 1, 1));
        _box.expandBy(SGBoxf(v0, v1));
    }
    void expandBy(const SGBoxf& box)
    { _box.expandBy(box); }
    
    SGBoxf _box;
};

}

#endif

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