Dogcows Code - chaz/yoink/blob - src/Moof/Ray.hh

   1
   2 /*]  Copyright (c) 2009-2010, Charles McGarvey  [**************************
   3 **]  All rights reserved.
   4 *
   5 * vi:ts=4 sw=4 tw=75
   6 *
   7 * Distributable under the terms and conditions of the 2-clause BSD license;
   8 * see the file COPYING for a complete text of the license.
   9 *
  10 **************************************************************************/
  11
  12 #ifndef _MOOF_RAY_HH_
  13 #define _MOOF_RAY_HH_
  14
  15 #include <Moof/Drawable.hh>
  16 #include <Moof/Math.hh>
  17 #include <Moof/OpenGL.hh>
  18 #include <Moof/Texture.hh>
  19
  20
  21 namespace Mf {
  22
  23
  24 /**
  25  * A line that goes to infinity.
  26  */
  27
  28 template <int D>
  29 struct Ray : public Drawable
  30 {
  31         typedef cml::vector< Scalar, cml::fixed<D> >    Vector;
  32
  33         // solution = point + t*direction
  34         Vector  point;
  35         Vector  direction;
  36
  37         struct Contact
  38         {
  39                 Scalar  distance;       // distance from the origin to the nearest point
  40                 Vector  normal;         // surface normal at contact point
  41
  42                 bool operator < (const Contact& rhs)
  43                 {
  44                         return distance < rhs.distance;
  45                 }
  46         };
  47
  48         void solve(Vector& p, Scalar t) const
  49         {
  50                 p = point + t*direction;
  51         }
  52
  53         void draw(Scalar alpha = 0.0) const
  54         {
  55                 Vector end = point + 1000.0 * direction;
  56                 // FIXME this is kinda cheesy
  57
  58                 Mf::Texture::resetBind();
  59                 glBegin(GL_LINES);
  60                         glVertex(point);
  61                         glVertex(end);
  62                 glEnd();
  63         }
  64
  65         void normalize()
  66         {
  67                 direction.normalize();
  68         }
  69 };
  70
  71
  72 typedef Ray<2>  Ray2;
  73 typedef Ray<3>  Ray3;
  74
  75
  76 } // namespace Mf
  77
  78 #endif // _MOOF_RAY_HH_
  79