Panda3D

boundingBox.I
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1 /**
2 * PANDA 3D SOFTWARE
3 * Copyright (c) Carnegie Mellon University. All rights reserved.
4 *
5 * All use of this software is subject to the terms of the revised BSD
6 * license. You should have received a copy of this license along
7 * with this source code in a file named "LICENSE."
8 *
9 * @file boundingBox.I
10 * @author drose
11 * @date 2007-05-31
12 */
13
14 /**
15 * Constructs an empty box object.
16 */
17 INLINE_MATHUTIL BoundingBox::
18 BoundingBox() {
19 }
20
21 /**
22 * Constructs a specific box object.
23 */
24 INLINE_MATHUTIL BoundingBox::
25 BoundingBox(const LPoint3 &min, const LPoint3 &max) :
26 _min(min), _max(max)
27 {
28 #ifdef NDEBUG
29 _flags = F_empty;
30 nassertv(!_min.is_nan() && !_max.is_nan());
31 nassertv(_min[0] <= _max[0] && _min[1] <= _max[1] && _min[2] <= _max[2]);
32 #endif // NDEBUG
33 _flags = 0;
34 }
35
36 /**
37 * An inline accessor for the minimum value. get_min() would also work, but
38 * it is a virtual non-inline method.
39 */
40 INLINE_MATHUTIL const LPoint3 &BoundingBox::
41 get_minq() const {
42 nassertr(!is_empty(), _min);
43 nassertr(!is_infinite(), _min);
44 return _min;
45 }
46
47 /**
48 * An inline accessor for the maximum value. get_max() would also work, but
49 * it is a virtual non-inline method.
50 */
51 INLINE_MATHUTIL const LPoint3 &BoundingBox::
52 get_maxq() const {
53 nassertr(!is_empty(), _max);
54 nassertr(!is_infinite(), _max);
55 return _max;
56 }
57
58 /**
59 * Returns 8: the number of vertices of a rectangular solid.
60 */
61 INLINE_MATHUTIL int BoundingBox::
62 get_num_points() const {
63 return 8;
64 }
65
66 /**
67 * Returns the nth vertex of the rectangular solid.
68 */
69 INLINE_MATHUTIL LPoint3 BoundingBox::
70 get_point(int n) const {
71 nassertr(n >= 0 && n < 8, LPoint3::zero());
72
73 // We do some trickery assuming that _min and _max are consecutive in
74 // memory.
75 const LPoint3 *a = &_min;
76 return LPoint3(a[(n>>2)&1][0], a[(n>>1)&1][1], a[(n)&1][2]);
77 }
78
79 /**
80 * Returns 6: the number of faces of a rectangular solid.
81 */
82 INLINE_MATHUTIL int BoundingBox::
83 get_num_planes() const {
84 return 6;
85 }
86
87 /**
88 * Returns the nth face of the rectangular solid.
89 */
90 INLINE_MATHUTIL LPlane BoundingBox::
91 get_plane(int n) const {
92 nassertr(n >= 0 && n < 6, LPlane());
93 return LPlane(get_point(plane_def[n][0]),
94 get_point(plane_def[n][1]),
95 get_point(plane_def[n][2]));
96 }
97
98 /**
99 * Sets the min and max point of the rectangular solid.
100 */
101 INLINE_MATHUTIL void BoundingBox::
102 set_min_max(const LPoint3 &min, const LPoint3 &max) {
103 nassertv(!min.is_nan() && !max.is_nan());
104 nassertv(min[0] <= max[0] && min[1] <= max[1] && min[2] <= max[2]);
105 _min = min;
106 _max = max;
107 _flags = 0;
108 }
BoundingBox::set_min_max
void set_min_max(const LPoint3 &min, const LPoint3 &max)
Sets the min and max point of the rectangular solid.
Definition: boundingBox.I:102
BoundingBox::get_minq
const LPoint3 & get_minq() const
An inline accessor for the minimum value.
Definition: boundingBox.I:41
BoundingBox::get_plane
get_plane
Returns the nth face of the rectangular solid.
Definition: boundingBox.h:54
BoundingBox::get_num_points
get_num_points
Returns 8: the number of vertices of a rectangular solid.
Definition: boundingBox.h:51
BoundingBox::BoundingBox
BoundingBox()
Constructs an empty box object.
Definition: boundingBox.I:18
BoundingBox::get_point
get_point
Returns the nth vertex of the rectangular solid.
Definition: boundingBox.h:51
BoundingBox::get_num_planes
get_num_planes
Returns 6: the number of faces of a rectangular solid.
Definition: boundingBox.h:54
BoundingBox::get_maxq
const LPoint3 & get_maxq() const
An inline accessor for the maximum value.
Definition: boundingBox.I:52
BoundingVolume::is_empty
bool is_empty() const
Any kind of volume might be empty.
Definition: boundingVolume.I:29
BoundingVolume::is_infinite
bool is_infinite() const
The other side of the empty coin is an infinite volume.
Definition: boundingVolume.I:44