248a3128161afe0cadbdde10fa781d6b3e89c405
[chaz/yoink] / src / Moof / Plane.hh
1
2 /*******************************************************************************
3
4 Copyright (c) 2009, Charles McGarvey
5 All rights reserved.
6
7 Redistribution and use in source and binary forms, with or without
8 modification, are permitted provided that the following conditions are met:
9
10 * Redistributions of source code must retain the above copyright notice,
11 this list of conditions and the following disclaimer.
12 * Redistributions in binary form must reproduce the above copyright notice,
13 this list of conditions and the following disclaimer in the documentation
14 and/or other materials provided with the distribution.
15
16 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
17 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
19 DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
20 FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
22 SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
23 CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
24 OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
25 OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26
27 *******************************************************************************/
28
29 #ifndef _MOOF_PLANE_HH_
30 #define _MOOF_PLANE_HH_
31
32 #include <Moof/Math.hh>
33
34
35 namespace Mf {
36
37
38 class Aabb;
39 class Sphere;
40
41
42 struct Plane
43 {
44 Vector3 normal;
45 Scalar d;
46
47 typedef enum
48 {
49 NEGATIVE = -1,
50 INTERSECT = 0,
51 POSITIVE = 1
52 } Halfspace;
53
54 Plane() {}
55 Plane(const Vector3& vector, Scalar scalar) :
56 normal(vector),
57 d(scalar) {}
58 Plane(Scalar a, Scalar b, Scalar c, Scalar scalar) :
59 normal(a, b, c),
60 d(scalar) {}
61
62
63 void normalize()
64 {
65 Scalar mag = normal.length();
66
67 normal /= mag;
68 d /= mag;
69 }
70
71 inline Scalar getDistanceToPoint(const Vector3& point) const
72 {
73 return cml::dot(point, normal) + d;
74 }
75
76 inline Halfspace intersectsPoint(const Vector3& point) const
77 {
78 Scalar distance = getDistanceToPoint(point);
79
80 if (isEqual(distance, 0.0)) return INTERSECT;
81 else if (distance < 0.0) return NEGATIVE;
82 else return POSITIVE;
83 }
84
85 Halfspace intersectsAabb(const Aabb& aabb) const;
86 Halfspace intersectsSphere(const Sphere& sphere) const;
87 };
88
89
90 } // namespace Mf
91
92 #endif // _MOOF_PLANE_HH_
93
94 /** vim: set ts=4 sw=4 tw=80: *************************************************/
95
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