Dogcows Code - chaz/yoink/blob - src/moof/ray.hh

   1
   2 /*]  Copyright (c) 2009-2011, Charles McGarvey  [*****************************
   3 **]  All rights reserved.
   4 *
   5 * Distributable under the terms and conditions of the 2-clause BSD license;
   6 * see the file COPYING for a complete text of the license.
   7 *
   8 *****************************************************************************/
   9
  10 #ifndef _MOOF_RAY_HH_
  11 #define _MOOF_RAY_HH_
  12
  13 /**
  14  * \file ray.hh
  15  * A class for lines that start at one point and go to infinity in some
  16  * direction.
  17  */
  18
  19 #include <moof/drawable.hh>
  20 #include <moof/image.hh>
  21 #include <moof/math.hh>
  22 #include <moof/opengl.hh>
  23
  24
  25 namespace moof {
  26
  27
  28 /**
  29  * A line that goes to infinity.
  30  */
  31 template <int D>
  32 struct ray : public drawable
  33 {
  34         typedef moof::vector< scalar, fixed<D> > vector;
  35
  36         // solution = point + t*direction
  37         vector  point;
  38         vector  direction;
  39
  40         struct contact
  41         {
  42                 scalar  distance;       // distance from the origin to the nearest point
  43                 vector  normal;         // surface normal at contact point
  44
  45                 bool operator < (const contact& rhs)
  46                 {
  47                         return distance < rhs.distance;
  48                 }
  49         };
  50
  51         void solve(vector& p, scalar t) const
  52         {
  53                 p = point + t*direction;
  54         }
  55
  56         void draw(scalar alpha = 0.0) const
  57         {
  58                 vector end = point + 1000.0 * direction;
  59                 // FIXME: this is kinda cheesy
  60
  61                 image::reset_binding();
  62                 glBegin(GL_LINES);
  63                         glVertex(point);
  64                         glVertex(end);
  65                 glEnd();
  66         }
  67
  68         void normalize()
  69         {
  70                 direction.normalize();
  71         }
  72 };
  73
  74 typedef ray<2> ray2;
  75 typedef ray<3> ray3;
  76
  77
  78 } // namespace moof
  79
  80 #endif // _MOOF_RAY_HH_
  81