DistRot.h

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/* $Id: DistRot.h,v 1.4 2002/11/05 14:31:15 anonymous Exp $ */

#ifndef __DIST_ROT_H
#define __DIST_ROT_H

#include <esg/geometry/includes.h>

#include <esg/Export>

/*
 * Class DistRot takes geometry and infomation about its transformation
 * in constructor. The distance() method takes static geometry and
 * returns their distance with next conditions:
 *
 * minimal distance < 0 => penetration
 * minimal distance > 0 => separation
 *
 * If distance is bigger then 'minimal distance'
 * then MAXFLOAT is returned, found distance is returned otherwise.
 *
 * Because convertion of two transformation matrices may change ratio scale,
 * this scale factor is get in constructor and applyied to computed distances
 * (distance is divided by this parapeter)
 */

namespace esg {

class OGSCENE_EXPORT DistRot {
protected:
    double _scaleRatio;
    
public:
    DistRot(double sr = 1.0)
        : _scaleRatio(sr) {}
    
    virtual ~DistRot() {}
    
    virtual double distance (Geometry& /* static geometry   */,
                             double    /* minimal distance  */,
                             Vector3*  /* approx. direction */) = 0;

    /*
     * Output separation diraction is valid only for objects that are
     * penetrated and represents the approximately shortest way to
     * get them separated.
     */
    virtual bool separation (Geometry& /* static geometry   */,
                             Vector3*  /* approx. direction */) = 0;
};

}; // namespace

#endif // __DIST_ROT_H

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