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 /**
  16  * \file ray.hh
  17  * A class for lines that start at one point and go to infinity in some
  18  * direction.
  19  */
  20
  21 #include <moof/drawable.hh>
  22 #include <moof/math.hh>
  23 #include <moof/opengl.hh>
  24 #include <moof/texture.hh>
  25
  26
  27 namespace moof {
  28
  29
  30 /**
  31  * A line that goes to infinity.
  32  */
  33 template <int D>
  34 struct ray : public drawable
  35 {
  36         typedef moof::vector< scalar, fixed<D> > vector;
  37
  38         // solution = point + t*direction
  39         vector  point;
  40         vector  direction;
  41
  42         struct contact
  43         {
  44                 scalar  distance;       // distance from the origin to the nearest point
  45                 vector  normal;         // surface normal at contact point
  46
  47                 bool operator < (const contact& rhs)
  48                 {
  49                         return distance < rhs.distance;
  50                 }
  51         };
  52
  53         void solve(vector& p, scalar t) const
  54         {
  55                 p = point + t*direction;
  56         }
  57
  58         void draw(scalar alpha = 0.0) const
  59         {
  60                 vector end = point + 1000.0 * direction;
  61                 // FIXME: this is kinda cheesy
  62
  63                 moof::texture::reset_binding();
  64                 glBegin(GL_LINES);
  65                         glVertex(point);
  66                         glVertex(end);
  67                 glEnd();
  68         }
  69
  70         void normalize()
  71         {
  72                 direction.normalize();
  73         }
  74 };
  75
  76
  77 typedef ray<2>  ray2;
  78 typedef ray<3>  ray3;
  79
  80
  81 } // namespace moof
  82
  83 #endif // _MOOF_RAY_HH_
  84