line2d.h

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//
// Copyright 2016 Pixar
//
// Licensed under the terms set forth in the LICENSE.txt file available at
// https://openusd.org/license.
//
#ifndef PXR_BASE_GF_LINE2D_H
#define PXR_BASE_GF_LINE2D_H
 
 
#include "pxr/pxr.h"
#include "pxr/base/gf/vec2d.h"
#include "pxr/base/gf/api.h"
 
#include <float.h>
 
PXR_NAMESPACE_OPEN_SCOPE
 
class GfLine2d {
 
  public:
 
    GfLine2d() {
    }
 
    GfLine2d(const GfVec2d &p0, const GfVec2d &dir ) {
        Set( p0, dir );
    }
 
    double Set(const GfVec2d &p0, const GfVec2d &dir ) {
        _p0 = p0;
        _dir = dir;
        return _dir.Normalize();
    }
 
    GfVec2d GetPoint( double t ) const { return _p0 + _dir * t; }
 
    const GfVec2d &GetDirection() const { return _dir; }
 
    GF_API
    GfVec2d FindClosestPoint(const GfVec2d &point, double *t = NULL) const;
 
    bool                operator ==(const GfLine2d &l) const {
        return _p0 == l._p0 &&  _dir  == l._dir;
    }
 
    bool                operator !=(const GfLine2d &r) const {
        return ! (*this == r);
    }
 
  private:
    GF_API
    friend bool GfFindClosestPoints( const GfLine2d &, const GfLine2d &,
                                     GfVec2d *, GfVec2d *,
                                     double *, double *);
 
    // Parametric description:
    //  l(t) = _p0 + t * _length * _dir;
    GfVec2d             _p0;
    GfVec2d             _dir;   
};
 
GF_API
bool GfFindClosestPoints(const GfLine2d &l1, const GfLine2d &l2,
                         GfVec2d *p1 = nullptr, GfVec2d *p2 = nullptr,
                         double *t1 = nullptr, double *t2 = nullptr);
 
PXR_NAMESPACE_CLOSE_SCOPE
 
#endif // PXR_BASE_GF_LINE2D_H