source/libmarklin/tracktype.cpp

   1 /* $Id$
   2
   3 This file is part of the MSP Märklin suite
   4 Copyright © 2006-2010  Mikkosoft Productions, Mikko Rasa
   5 Distributed under the GPL
   6 */
   7
   8 #include <cmath>
   9 #include "tracktype.h"
  10
  11 using namespace std;
  12 using namespace Msp;
  13
  14 namespace Marklin {
  15
  16 TrackType::TrackType(unsigned a):
  17         art_nr(a),
  18         double_address(false),
  19         autofit_preference(1)
  20 { }
  21
  22 float TrackType::get_total_length() const
  23 {
  24         return get_path_length(-1);
  25 }
  26
  27 float TrackType::get_path_length(int p) const
  28 {
  29         float len = 0;
  30         for(vector<TrackPart>::const_iterator i=parts.begin(); i!=parts.end(); ++i)
  31                 if(p<0 || i->get_path()==static_cast<unsigned>(p))
  32                         len += i->get_length();
  33         return len;
  34 }
  35
  36 unsigned TrackType::get_paths() const
  37 {
  38         unsigned mask = 0;
  39         for(vector<TrackPart>::const_iterator i=parts.begin(); i!=parts.end(); ++i)
  40                 mask |= 1<<i->get_path();
  41         return mask;
  42 }
  43
  44 unsigned TrackType::get_n_paths() const
  45 {
  46         unsigned n = 0;
  47         for(unsigned mask = get_paths(); mask; ++n)
  48                 mask &= mask-1;
  49         return n;
  50 }
  51
  52 bool TrackType::is_turnout() const
  53 {
  54         return endpoints.size()>2;
  55 }
  56
  57 bool TrackType::is_dead_end() const
  58 {
  59         return endpoints.size()<2;
  60 }
  61
  62 TrackPoint TrackType::get_point(unsigned epi, unsigned path, float d) const
  63 {
  64         if(epi>=endpoints.size())
  65                 throw InvalidParameterValue("Endpoint index out of range");
  66
  67         const TrackPart *part = 0;
  68         unsigned part_ep = 0;
  69         for(vector<TrackPart>::const_iterator i=parts.begin(); i!=parts.end(); ++i)
  70         {
  71                 if((endpoints[epi].paths&(1<<path)) && i->get_path()!=path)
  72                         continue;
  73
  74                 unsigned n_part_eps = (i->is_dead_end() ? 1 : 2);
  75                 for(unsigned j=0; j<n_part_eps; ++j)
  76                 {
  77                         TrackPoint p = i->get_point(j ? i->get_length() : 0);
  78                         float dx = p.pos.x-endpoints[epi].pos.x;
  79                         float dy = p.pos.y-endpoints[epi].pos.y;
  80                         if(dx*dx+dy*dy<1e-6)
  81                         {
  82                                 part = &*i;
  83                                 part_ep = j;
  84                         }
  85                 }
  86         }
  87
  88         if(!part)
  89                 throw Exception("Internal error (endpoint does not match any part)");
  90
  91         while(1)
  92         {
  93                 float plen = part->get_length();
  94                 if(d<=plen)
  95                 {
  96                         if(part_ep==1)
  97                                 d = plen-d;
  98                         TrackPoint p = part->get_point(d);
  99                         if(part_ep==1)
 100                                 p.dir += M_PI;
 101                         return p;
 102                 }
 103                 else
 104                 {
 105                         d -= plen;
 106                         TrackPart *next = part->get_link(1-part_ep);
 107                         if(!next)
 108                                 throw InvalidParameterValue("Distance out of range");
 109                         part_ep = (next->get_link(0)==part ? 0 : 1);
 110                         part = next;
 111                 }
 112         }
 113 }
 114
 115 void TrackType::collect_endpoints()
 116 {
 117         endpoints.clear();
 118
 119         for(vector<TrackPart>::iterator i=parts.begin(); i!=parts.end(); ++i)
 120         {
 121                 for(vector<TrackPart>::iterator j=i; ++j!=parts.end();)
 122                         i->check_link(*j);
 123
 124                 unsigned n_part_eps = (i->is_dead_end() ? 1 : 2);
 125                 for(unsigned j=0; j<n_part_eps; ++j)
 126                         if(!i->get_link(j))
 127                         {
 128                                 TrackPoint p = i->get_point(j ? i->get_length() : 0);
 129                                 if(j==0)
 130                                         p.dir += M_PI;
 131
 132                                 bool found = false;
 133                                 for(vector<Endpoint>::iterator k=endpoints.begin(); k!=endpoints.end(); ++k)
 134                                 {
 135                                         float dx = k->pos.x-p.pos.x;
 136                                         float dy = k->pos.y-p.pos.y;
 137
 138                                         float da = k->dir-p.dir;
 139                                         while(da>M_PI)
 140                                                 da -= M_PI*2;
 141                                         while(da<-M_PI)
 142                                                 da += M_PI*2;
 143
 144                                         if(dx*dx+dy*dy<1e-6 && da>-0.01 && da<0.01)
 145                                         {
 146                                                 k->paths |= 1<<i->get_path();
 147                                                 found = true;
 148                                                 break;
 149                                         }
 150                                 }
 151
 152                                 if(!found)
 153                                         endpoints.push_back(Endpoint(p.pos.x, p.pos.y, p.dir, 1<<i->get_path()));
 154                         }
 155         }
 156 }
 157
 158 TrackType::Endpoint::Endpoint(float x, float y, float d, unsigned p):
 159         pos(x, y),
 160         dir(d),
 161         paths(p)
 162 { }
 163
 164
 165 TrackType::Loader::Loader(TrackType &t):
 166         Msp::DataFile::BasicLoader<TrackType>(t)
 167 {
 168         add("autofit_preference", &TrackType::autofit_preference);
 169         add("description", &TrackType::description);
 170         add("double_address", &TrackType::double_address);
 171         add("part",        &Loader::part);
 172 }
 173
 174 void TrackType::Loader::finish()
 175 {
 176         obj.collect_endpoints();
 177 }
 178
 179 void TrackType::Loader::part()
 180 {
 181         TrackPart p;
 182         load_sub(p);
 183         obj.parts.push_back(p);
 184 }
 185
 186 } // namespace Marklin