Dogcows Code - chaz/yoink/blob - src/Moof/Aabb.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_AABB_HH_
  30 #define _MOOF_AABB_HH_
  31
  32 #include <Moof/Cullable.hh>
  33 #include <Moof/Drawable.hh>
  34 #include <Moof/Math.hh>
  35 #include <Moof/Plane.hh>
  36
  37
  38 namespace Mf {
  39
  40
  41 /**
  42  * Axis-aligned Bounding Box
  43  */
  44
  45 struct Aabb : public Cullable, public Drawable
  46 {
  47         Vector3 min;
  48         Vector3 max;
  49
  50         Aabb() {}
  51
  52         Aabb(const Vector3& a, const Vector3& b)
  53         {
  54                 init(a, b);
  55         }
  56
  57         Aabb(Scalar ax, Scalar ay, Scalar az,
  58                         Scalar bx, Scalar by, Scalar bz)
  59         {
  60                 Vector3 a(ax, ay, az);
  61                 Vector3 b(bx, by, bz);
  62
  63                 init(a, b);
  64         }
  65
  66         void init(const Vector3& a, const Vector3& b)
  67         {
  68                 if (a[0] < b[0])
  69                 {
  70                         min[0] = a[0];
  71                         max[0] = b[0];
  72                 }
  73                 else
  74                 {
  75                         min[0] = b[0];
  76                         max[0] = a[0];
  77                 }
  78                 if (a[1] < b[1])
  79                 {
  80                         min[1] = a[1];
  81                         max[1] = b[1];
  82                 }
  83                 else
  84                 {
  85                         min[1] = b[1];
  86                         max[1] = a[1];
  87                 }
  88                 if (a[2] < b[2])
  89                 {
  90                         min[2] = a[2];
  91                         max[2] = b[2];
  92                 }
  93                 else
  94                 {
  95                         min[2] = b[2];
  96                         max[2] = a[2];
  97                 }
  98         }
  99
 100         Vector3 getCenter() const
 101         {
 102                 return Vector3((min[0] + max[0]) / 2.0,
 103                                            (min[1] + max[1]) / 2.0,
 104                                            (min[2] + max[2]) / 2.0);
 105         }
 106
 107         void getOctant(Aabb& octant, int num) const;
 108
 109         Plane getPlaneXY() const
 110         {
 111                 Plane plane;
 112                 plane.normal = Vector3(0.0, 0.0, 1.0);
 113                 plane.d = cml::dot(-plane.normal, getCenter());
 114                 return plane;
 115         }
 116
 117         Plane getPlaneXZ() const
 118         {
 119                 Plane plane;
 120                 plane.normal = Vector3(0.0, 1.0, 0.0);
 121                 plane.d = cml::dot(-plane.normal, getCenter());
 122                 return plane;
 123         }
 124
 125         Plane getPlaneYZ() const
 126         {
 127                 Plane plane;
 128                 plane.normal = Vector3(1.0, 0.0, 0.0);
 129                 plane.d = cml::dot(-plane.normal, getCenter());
 130                 return plane;
 131         }
 132
 133         void getCorners(Vector3 corners[8]) const;
 134
 135         void encloseVertices(const Vector3 vertices[], unsigned count);
 136
 137         void draw(Scalar alpha = 0.0) const;
 138         bool isVisible(const Frustum& frustum) const;
 139 };
 140
 141
 142 } // namespace Mf
 143
 144 #endif // _MOOF_AABB_HH_
 145
 146 /** vim: set ts=4 sw=4 tw=80: *************************************************/
 147