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line2d.h
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2 // Copyright 2016 Pixar
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24 #ifndef GF_LINE2D_H
25 #define GF_LINE2D_H
26 
29 
30 #include "pxr/pxr.h"
31 #include "pxr/base/gf/vec2d.h"
32 #include "pxr/base/gf/api.h"
33 
34 #include <float.h>
35 
36 PXR_NAMESPACE_OPEN_SCOPE
37 
49 class GfLine2d {
50 
51  public:
52 
55  }
56 
58  GfLine2d(const GfVec2d &p0, const GfVec2d &dir ) {
59  Set( p0, dir );
60  }
61 
62  double Set(const GfVec2d &p0, const GfVec2d &dir ) {
63  _p0 = p0;
64  _dir = dir;
65  return _dir.Normalize();
66  }
67 
70  GfVec2d GetPoint( double t ) const { return _p0 + _dir * t; }
71 
73  const GfVec2d &GetDirection() const { return _dir; }
74 
78  GF_API
79  GfVec2d FindClosestPoint(const GfVec2d &point, double *t = NULL) const;
80 
83  bool operator ==(const GfLine2d &l) const {
84  return _p0 == l._p0 && _dir == l._dir;
85  }
86 
89  bool operator !=(const GfLine2d &r) const {
90  return ! (*this == r);
91  }
92 
93  private:
94  GF_API
95  friend bool GfFindClosestPoints( const GfLine2d &, const GfLine2d &,
96  GfVec2d *, GfVec2d *,
97  double *, double *);
98 
99  // Parametric description:
100  // l(t) = _p0 + t * _length * _dir;
101  GfVec2d _p0;
102  GfVec2d _dir;
103 };
104 
113 GF_API
114 bool GfFindClosestPoints(const GfLine2d &l1, const GfLine2d &l2,
115  GfVec2d *p1 = nullptr, GfVec2d *p2 = nullptr,
116  double *t1 = nullptr, double *t2 = nullptr);
117 
118 PXR_NAMESPACE_CLOSE_SCOPE
119 
120 #endif // GF_LINE2D_H
const GfVec2d & GetDirection() const
Return the normalized direction of the line.
Definition: line2d.h:73
Basic type: 2D line.
Definition: line2d.h:49
GfLine2d()
The default constructor leaves line parameters undefined.
Definition: line2d.h:54
GF_API bool GfFindClosestPoints(const GfLine &l1, const GfLine &l2, GfVec3d *p1=nullptr, GfVec3d *p2=nullptr, double *t1=nullptr, double *t2=nullptr)
Computes the closets points between two lines.
Basic type for a vector of 2 double components.
Definition: vec2d.h:63
double Normalize(double eps=GF_MIN_VECTOR_LENGTH)
Normalizes the vector in place to unit length, returning the length before normalization.
Definition: vec2d.h:263
GfVec2d GetPoint(double t) const
Return the point on the line at ( p0 + t * dir ).
Definition: line2d.h:70
GfLine2d(const GfVec2d &p0, const GfVec2d &dir)
Construct a line from a point and a direction.
Definition: line2d.h:58
GF_API GfVec2d FindClosestPoint(const GfVec2d &point, double *t=NULL) const
Returns the point on the line that is closest to point.
bool operator==(const GfLine2d &l) const
Component-wise equality test.
Definition: line2d.h:83
bool operator!=(const GfLine2d &r) const
Component-wise inequality test.
Definition: line2d.h:89
GF_API friend bool GfFindClosestPoints(const GfLine2d &, const GfLine2d &, GfVec2d *, GfVec2d *, double *, double *)
Computes the closets points between two lines.