Dogcows Code - chaz/yoink/blob - 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