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SpatialConstraint.h
1 #ifndef _SpatialConstraint_h
2 #define _SpatialConstraint_h
3 //# Filename: SpatialConstraint.h
4 //#
5 //# Classes defined here: SpatialConstraint SpatialSign
6 //#
7 //#
8 //# Author: Peter Z. Kunszt, based on A. Szalay's code
9 //#
10 //# Date: October 16, 1998
11 //#
12 //# SPDX-FileCopyrightText: 2000 Peter Z. Kunszt Alex S. Szalay, Aniruddha R. Thakar
13 //# The Johns Hopkins University
14 //#
15 //# Modification History:
16 //#
17 //# Oct 18, 2001 : Dennis C. Dinge -- Replaced ValVec with std::vector
18 //#
19 
20 #include "SpatialGeneral.h"
21 #include "SpatialSign.h"
22 #include "SpatialVector.h"
23 //
24 //########################################################################
25 //#
26 //# Spatial Constraint class
27 //#
28 /**
29  The Constraint is really a cone on the sky-sphere. It is characterized
30  by its direction a_, the opening angle s_ and its cosine -- the distance
31  of the plane intersecting the sphere and the sphere center.
32  If d_ = 0, we have a half-sphere. If it is negative, we have a 'hole'
33  i.e. the room angle is larger than 90degrees.
34 
35  Example: positive distance
36 
37  ____
38  --- ---
39  / /|\
40  / / |=\
41  | / |==| this side is in the convex.
42  | /\s |===|
43  |------------|---| -> direction a
44  | \ |===|
45  | \ |==|
46  \ \ |=/
47  \ \|/
48  ---____---
49 
50 
51  <-d-> is positive (s < 90)
52 
53  Example: negative distance
54 
55  ____
56  ---====---
57  this side is /========/|\
58  in the /========/=| \
59  convex |==== s__/==| |
60  |===== / /===| |
61  dir. a <- |------------|---| 'hole' in the sphere
62  |========\===| |
63  |========\==| |
64  \========\=| /
65  \========\|/
66  ---____---
67 
68 
69  <-d-> is negative (s > 90)
70 
71  for d=0 we have a half-sphere. Combining such, we get triangles, rectangles
72  etc on the sphere surface (pure ZERO convexes)
73 
74 */
75 class LINKAGE SpatialConstraint
76 {
77  public:
78  /// Constructor
80 
81  /// Initialization constructor
83 
84  /// check whether a vector is inside this
85  bool contains(const SpatialVector v);
86 
87  /// give back vector
88  SpatialVector &v() { return a_; }
89 
90  private:
91  Sign sign_;
92  SpatialVector a_; // normal vector
93  float64 d_; // distance from origin
94  float64 s_; // cone angle in radians
95 
96  friend class RangeConvex;
97 };
98 
99 #endif
SpatialConstraint()
Constructor.
The Constraint is really a cone on the sky-sphere.
SpatialVector & v()
give back vector
A spatial convex is composed of spatial constraints.
Definition: RangeConvex.h:59
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