lineSeg2d.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_LINE_SEG2D_H
#define PXR_BASE_GF_LINE_SEG2D_H
 
 
#include "pxr/pxr.h"
#include "pxr/base/gf/line2d.h"
#include "pxr/base/gf/vec2d.h"
#include "pxr/base/gf/api.h"
 
#include <float.h>
 
PXR_NAMESPACE_OPEN_SCOPE
 
class GfLineSeg2d {
 
  public:
 
    GfLineSeg2d() {
    }
 
    GfLineSeg2d(const GfVec2d &p0, const GfVec2d &p1 ) {
        _length = _line.Set( p0, p1 - p0 );
    }
 
    GfVec2d GetPoint( double t ) const {return _line.GetPoint( t * _length );}
 
    const GfVec2d &GetDirection() const { return _line.GetDirection(); }
 
    double GetLength() const { return _length; }
 
    GF_API
    GfVec2d FindClosestPoint(const GfVec2d &point, double *t = NULL) const;
 
    bool        operator ==(const GfLineSeg2d &l) const {
        return (_line == l._line && _length  == l._length);
    }
 
    bool        operator !=(const GfLineSeg2d &r) const {
        return ! (*this == r);
    }
 
  private:
    GF_API
    friend bool GfFindClosestPoints( const GfLine2d &, const GfLineSeg2d &,
                                     GfVec2d *, GfVec2d *,
                                     double *t1, double *t2 );
    GF_API
    friend bool GfFindClosestPoints( const GfLineSeg2d &, const GfLineSeg2d &,
                                     GfVec2d *, GfVec2d *,
                                     double *, double * );
 
    GfLine2d            _line;
    double              _length;   // distance from p0 to p1
};
 
GF_API
bool GfFindClosestPoints( const GfLine2d &line, const GfLineSeg2d &seg,
                          GfVec2d *p1 = nullptr, GfVec2d *p2 = nullptr,
                          double *t1 = nullptr, double *t2 = nullptr );
 
GF_API
bool GfFindClosestPoints( const GfLineSeg2d &seg1, const GfLineSeg2d &seg2,
                          GfVec2d *p1 = nullptr, GfVec2d *p2 = nullptr,
                          double *t1 = nullptr, double *t2 = nullptr );
 
PXR_NAMESPACE_CLOSE_SCOPE
 
#endif // PXR_BASE_GF_LINE_SEG2D_H