particle.hxx

   1 //  $Id: particle.hxx,v 1.16 2003/07/27 18:46:11 grumbel Exp $
   2 //
   3 //  Construo - A wire-frame construction game
   4 //  Copyright (C) 2002 Ingo Ruhnke <grumbel@gmx.de>
   5 //
   6 //  This program is free software; you can redistribute it and/or
   7 //  modify it under the terms of the GNU General Public License
   8 //  as published by the Free Software Foundation; either version 2
   9 //  of the License, or (at your option) any later version.
  10 //
  11 //  This program is distributed in the hope that it will be useful,
  12 //  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 //  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 //  GNU General Public License for more details.
  15 //
  16 //  You should have received a copy of the GNU General Public License
  17 //  along with this program; if not, write to the Free Software
  18 //  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  19
  20 #ifndef HEADER_CONSTRUO_PARTICLE_HXX
  21 #define HEADER_CONSTRUO_PARTICLE_HXX
  22
  23 #include <iostream>
  24 #include "lisp_writer.hxx"
  25 #include "construo.hxx"
  26 #include "zoom_graphic_context.hxx"
  27 #include "vector2d.hxx"
  28
  29 class Particle
  30 {
  31 private:
  32   /** Id of the particle */
  33    int id;
  34
  35 public:
  36   /** position of the particle */
  37   Vector2d pos;
  38
  39   /** velocity of the particle */
  40   Vector2d  velocity;
  41
  42 private:
  43   /** the mass of the particle as 1/mass (FIXME: is this still the
  44       case?!) */
  45   float mass;
  46 public:
  47   /** If true the particle will have a fixed position which cannot be
  48       changed, if false the particle reacts to forces as normal. */
  49   bool fixed;
  50
  51   /** totale force acting on particle (used as temp-var in update() to
  52       collect the forces)*/
  53   Vector2d totale_force;
  54
  55   /** Number of connection this particle has to other springs */
  56   int spring_links;
  57
  58   /** The id of the particle, used for de/serialisation and copying of
  59       the World. The id is uniq only for a single world. */
  60   inline int get_id () const {
  61     return id;
  62   }
  63
  64   void add_force (const Vector2d& force)
  65   {
  66     if (fixed) return;
  67     totale_force += force;
  68   }
  69
  70   void clear_force ()
  71   {
  72     totale_force = Vector2d ();
  73   }
  74
  75   void set_fixed (bool f) {
  76     fixed = f;
  77   }
  78
  79   bool get_fixed () {
  80     return fixed;
  81   }
  82
  83   inline float get_mass () const { return mass; }
  84
  85   void update (float delta);
  86   void draw (ZoomGraphicContext* gc);
  87
  88   /** draws the particle in highlight mode (aka if mouse is over it) */
  89   void draw_highlight (ZoomGraphicContext* gc);
  90
  91   /** draws additional infos to this stop */
  92   void draw_infos (ZoomGraphicContext* gc);
  93
  94   void draw_velocity_vector (ZoomGraphicContext* gc);
  95
  96   lisp_object_t* serialize();
  97
  98   friend class ParticleFactory;
  99
 100 private:
 101   // Nobody beside the ParticleFactory can create particles
 102   Particle (int id_, const Vector2d& arg_pos, const Vector2d& arg_velocity, float mass_, bool fixed_);
 103   Particle (const Particle&);
 104 };
 105
 106 #endif
 107
 108 /* EOF */