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