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particle.cxx

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00001 //  $Id: particle.cxx,v 1.19 2003/01/10 20:44:09 grumbel Exp $
00002 //
00003 //  Construo - A wire-frame construction game
00004 //  Copyright (C) 2002 Ingo Ruhnke <[email protected]>
00005 //
00006 //  This program is free software; you can redistribute it and/or
00007 //  modify it under the terms of the GNU General Public License
00008 //  as published by the Free Software Foundation; either version 2
00009 //  of the License, or (at your option) any later version.
00010 //
00011 //  This program is distributed in the hope that it will be useful,
00012 //  but WITHOUT ANY WARRANTY; without even the implied warranty of
00013 //  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00014 //  GNU General Public License for more details.
00015 //
00016 //  You should have received a copy of the GNU General Public License
00017 //  along with this program; if not, write to the Free Software
00018 //  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
00019 
00020 #include "colors.hxx"
00021 #include "math.hxx"
00022 #include "lisp_reader.hxx"
00023 #include "string_utils.hxx"
00024 #include "particle.hxx"
00025 
00026 using namespace StringUtils;
00027 
00028 Particle::Particle (int i, const Vector2d& arg_pos, const Vector2d& arg_velocity, float m, bool f)
00029   : id (i), 
00030     pos (arg_pos),
00031     velocity (arg_velocity), 
00032     mass (m), 
00033     fixed (f),
00034     totale_force (0,0),
00035     spring_links (0)
00036 {
00037 }
00038 
00039 Particle::Particle (const Particle& p)
00040   : id (p.id),
00041     pos (p.pos),
00042     velocity (p.velocity),
00043     mass (p.mass),
00044     fixed (p.fixed),
00045     totale_force (0,0),
00046     spring_links (0)
00047 {
00048 }
00049 
00050 lisp_object_t* 
00051 Particle::serialize()
00052 {
00053   LispWriter obj ("particle");
00054   obj.write_int ("id", id);
00055   obj.write_vector ("pos", pos);
00056   obj.write_vector ("velocity", velocity);
00057   obj.write_boolean ("fixed", fixed);
00058   obj.write_float ("mass", mass);
00059   return obj.create_lisp ();
00060 }
00061 
00062 void
00063 Particle::draw_highlight (ZoomGraphicContext* gc)
00064 {
00065   gc->get_parent_gc()->draw_fill_circle (gc->world_to_screen(pos),
00066                                          Math::round(Math::max(6.0f, get_mass() + 3)),
00067                                          Colors::highlight);
00068 }
00069 
00070 void
00071 Particle::draw_infos (ZoomGraphicContext* gc)
00072 {
00073   Vector2d p = gc->world_to_screen(pos);
00074   draw_velocity_vector (gc);
00075   gc->get_parent_gc()->draw_string (p + Vector2d(20.0f, 5.0f),
00076                                     "Particle: " + to_string (pos));
00077   gc->get_parent_gc()->draw_string (p + Vector2d(20.0f, 25.0f),
00078                                     "Fixed:    " + to_string (fixed));
00079   gc->get_parent_gc()->draw_string (p + Vector2d(20.0f, 45.0f),
00080                                     "Mass :    " + to_string (get_mass()));
00081   gc->get_parent_gc()->draw_string (p + Vector2d(20.0f, 70.0f),
00082                                     "Links :    " + to_string (spring_links));
00083 }
00084 
00085 void
00086 Particle::draw (ZoomGraphicContext* gc)
00087 {
00088   if (pos.y < 598.5f)
00089     {
00090       if (fixed)
00091         {
00092           gc->get_parent_gc()->draw_fill_circle (gc->world_to_screen(pos),
00093                                                  4,
00094                                                  Color(0.6f, 0.6f, 0.6f));
00095         }
00096       else
00097         {
00098           gc->get_parent_gc()->draw_fill_circle (gc->world_to_screen(pos),
00099                                                  Math::round(Math::max(3.0f, get_mass())),
00100                                                  Color(1.0f, 0.0f, 0.0f));
00101         }
00102     }
00103 }
00104 
00105 void
00106 Particle::draw_velocity_vector (ZoomGraphicContext* gc)
00107 {
00108   gc->draw_line (int (pos.x), int (pos.y),
00109                  int (pos.x + velocity.x), int (pos.y + velocity.y),
00110                  Color (0.0f, 0.0f, 1.0f));
00111 }
00112 
00113 void
00114 Particle::update (float delta)
00115 {
00116   const float max_velocity = 1000.0f;
00117 
00118   if (fixed) return;
00119 
00120   velocity += totale_force * delta * (1.0f/mass);
00121 
00122   // damping
00123   if (0)
00124     velocity -= (velocity * (1.0f/mass) * delta) * 0.001f;
00125 
00126   //velocity *= .999999f ;
00127 
00128   pos += velocity * delta;
00129 
00130   float collision_damp = 0.2;
00131 
00132 #if 0 // FIXME: Replace this with a generic shape collision handling thing
00133   // Calc collision with screen x border
00134   if (pos.x < 0) {
00135     velocity.x =  fabs(velocity.x);
00136     pos.x = 0;
00137     velocity *= collision_damp;
00138   } else if (pos.x > 799) {
00139     velocity.x =  -fabs(velocity.x);
00140     pos.x = 799;
00141     velocity *= collision_damp;
00142   }
00143 
00144   // Calc collision with screen y border
00145   if (pos.y < 0) {
00146     velocity.y =  fabs(velocity.y);
00147     pos.y = 0;
00148     velocity *= collision_damp;
00149   } else
00150 #endif
00151 
00152     if (pos.y > 599) {
00153       velocity.y =  -fabs(velocity.y);
00154       pos.y = 599;
00155       velocity *= collision_damp;
00156     }
00157 
00158   /*
00159     Vector2d dist = pos - Vector2d (400, 300);
00160     if (dist.norm () < 50.0f)
00161     {
00162     velocity = -velocity;
00163     }*/
00164   clear_force ();
00165 
00166   // Avoid to fast things
00167   if (velocity.norm () > max_velocity)
00168     {
00169       velocity.normalize();
00170       velocity *= max_velocity;
00171     }
00172 }
00173 
00174 
00175 /* EOF */

Generated on Thu Jul 24 10:24:30 2003 for Construo by doxygen1.3-rc3