IMP  2.4.0 The Integrative Modeling Platform
Segment3D.h
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1 /**
2  * \file IMP/algebra/Segment3D.h
3  * \brief Simple implementation of segments in 3D
4  *
6  */
7
8 #ifndef IMPALGEBRA_SEGMENT_3D_H
9 #define IMPALGEBRA_SEGMENT_3D_H
10
11 #include <IMP/algebra/algebra_config.h>
12 #include "Vector3D.h"
13 #include "BoundingBoxD.h"
14 #include "algebra_macros.h"
15 #include "GeometricPrimitiveD.h"
16 #include <iostream>
17 #include "constants.h"
18
19 IMPALGEBRA_BEGIN_NAMESPACE
20 //! Simple implementation of segments in 3D
21 /** A line segment is defined by a start and end point (as Vector3D).
22  \geometry
23  */
24 class IMPALGEBRAEXPORT Segment3D : public GeometricPrimitiveD<3> {
25  public:
26  Segment3D() {}
27  Segment3D(const Vector3D &start, const Vector3D &end);
28  //! Get the start=0/end=1 point of the segment
29  const Vector3D &get_point(unsigned int i) const {
30  IMP_INTERNAL_CHECK(i < 2, "Invalid point index");
31  return p_[i];
32  }
33  Vector3D get_middle_point() const { return .5 * p_[0] + .5 * p_[1]; }
34  /** \brief Get a normalized direction vector pointing from
35  get_point(0) to get_point(1).
36  */
37  Vector3D get_direction() const { return (p_[1] - p_[0]).get_unit_vector(); }
38  double get_length() const;
40  { out << spaces_io(p_[0]) << ": " << spaces_io(p_[1]); });
41
42  private:
43  Vector3D p_[2];
44 };
45
46 IMP_LINEAR_GEOMETRY_METHODS(Segment3D, segment_3d,
47  return BoundingBoxD<3>(g.get_point(0)) +
48  BoundingBoxD<3>(g.get_point(1)));
49
50 /** Returns f, the 'relative' projection of a point p onto the line
51  that contains s.
52  Formally, the projection of p onto the line through s is s[0]+f*(s[1]-s[0])
53  f is in the range [0..1] if the projection of p is inside s.
54
55  @param s segment in 3D
56  @param p point in 3D
57
58  @return the 'relative' project of p onto the line containing s
59 */
60 IMPALGEBRAEXPORT double get_relative_projection_on_segment(
61  const Segment3D &s, const algebra::Vector3D &p);
62
63 //! Get the distance between a segment and a point
64 /** \see Segment3D */
65 IMPALGEBRAEXPORT double get_distance(const Segment3D &s, const Vector3D &p);
66
67 //! Get the distance between two segments
68 /** \see Segment3D */
69 IMPALGEBRAEXPORT double get_distance(const Segment3D &a, const Segment3D &b);
70
71 IMPALGEBRA_END_NAMESPACE
72
73 #endif /* IMPALGEBRA_SEGMENT_3D_H */
Basic types used by IMP.
double get_distance(const Segment3D &a, const Segment3D &b)
Get the distance between two segments.
#define IMP_SHOWABLE_INLINE(Name, how_to_show)
Declare the methods needed by an object that can be printed.
#define IMP_LINEAR_GEOMETRY_METHODS(Name, name, bounding_box)
Implement the needed namespace methods for a geometry type.
#define IMP_INTERNAL_CHECK(expr, message)
An assertion to check for internal errors in IMP. An IMP::ErrorException will be thrown.
Definition: check_macros.h:141
Base class for geometric types.
Vector3D get_direction() const
Get a normalized direction vector pointing from get_point(0) to get_point(1).
Definition: Segment3D.h:37
A bounding box in D dimensions.
Various useful constants.
Simple implementation of segments in 3D.
Definition: Segment3D.h:24
double get_relative_projection_on_segment(const Segment3D &s, const algebra::Vector3D &p)
VectorD< 3 > Vector3D
Definition: VectorD.h:395
Simple 3D vector class.
Various important macros for implementing geometry.
const Vector3D & get_point(unsigned int i) const
Get the start=0/end=1 point of the segment.
Definition: Segment3D.h:29