PlaneInt.h

//===========================================================================
// GoTools - SINTEF Geometry Tools
//
// GoTools module: Intersections, version 1.0
//
// Copyright (C) 2000-2007 SINTEF ICT, Applied Mathematics, Norway.
//
// This program 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 version 2 of the License. 
//
// This program 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 this program; if not, write to the Free Software            
// Foundation, Inc.,                                                      
// 59 Temple Place - Suite 330,                                           
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//
// Contact information: E-mail: tor.dokken@sintef.no                      
// SINTEF ICT, Department of Applied Mathematics,                         
// P.O. Box 124 Blindern,                                                 
// 0314 Oslo, Norway.                                                     
//
// Other licenses are also available for this software, notably licenses
// for:
// - Building commercial software.                                        
// - Building software whose source code you wish to keep private.        
//===========================================================================
#ifndef _PLANEINT_H
#define _PLANEINT_H


#include "AlgObj3DInt.h"
#include "Point.h"
#include <boost/shared_ptr.hpp>


using namespace boost;


namespace Go {



class SplineSurface;



class PlaneInt : public AlgObj3DInt
{
public:
    PlaneInt();

    PlaneInt(Point point, Point normal);

    PlaneInt(double a, double b, double c, double d);

    virtual ~PlaneInt();

    void read(std::istream& is);

    double a() const;
    double b() const;
    double c() const;
    double d() const;

    boost::shared_ptr<SplineSurface>
    surface(Point mid_pt, double length_x, double length_y) const;


private:

    // (n_x, n_y, n_z)*(x - x_0, y - y_0, z - z_0) = 0.
    Point point_; // 3D ref point (x_0, y_0, z_0).
    Point normal_; // 3D normal direction (n_x, n_y, n_z).

    // Compute point_ & normal_.
    void computePoints();

    // Compute a, b, c & d based on point_ & normal_.
    void computeConstants(Point point, Point normal,
                          double& a, double& b, double& c, double& d) const;

    // We return the projection of the 3D input space_pt.
    Point projectPoint(const Point& space_pt) const;

};


} // namespace Go


#endif // _PLANEINT_H

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