source/libr2c2/tracktype.cpp

   1 /* $Id$
   2
   3 This file is part of R²C²
   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 R2C2 {
  15
  16 TrackType::TrackType(const ArticleNumber &an):
  17         art_nr(an),
  18         state_bits(0),
  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 const TrackType::Endpoint &TrackType::get_endpoint(unsigned i) const
  63 {
  64         if(i>=endpoints.size())
  65                 throw InvalidParameterValue("Endpoint index out of range");
  66
  67         return endpoints[i];
  68 }
  69
  70 TrackPoint TrackType::get_point(unsigned epi, unsigned path, float d) const
  71 {
  72         if(epi>=endpoints.size())
  73                 throw InvalidParameterValue("Endpoint index out of range");
  74
  75         const TrackPart *part = 0;
  76         unsigned part_ep = 0;
  77         for(vector<TrackPart>::const_iterator i=parts.begin(); i!=parts.end(); ++i)
  78         {
  79                 if((endpoints[epi].paths&(1<<path)) && i->get_path()!=path)
  80                         continue;
  81
  82                 unsigned n_part_eps = (i->is_dead_end() ? 1 : 2);
  83                 for(unsigned j=0; j<n_part_eps; ++j)
  84                 {
  85                         TrackPoint p = i->get_point(j ? i->get_length() : 0);
  86                         float dx = p.pos.x-endpoints[epi].pos.x;
  87                         float dy = p.pos.y-endpoints[epi].pos.y;
  88                         if(dx*dx+dy*dy<1e-6)
  89                         {
  90                                 part = &*i;
  91                                 part_ep = j;
  92                         }
  93                 }
  94         }
  95
  96         if(!part)
  97                 throw Exception("Internal error (endpoint does not match any part)");
  98
  99         while(1)
 100         {
 101                 float plen = part->get_length();
 102                 if(d<=plen)
 103                 {
 104                         if(part_ep==1)
 105                                 d = plen-d;
 106                         TrackPoint p = part->get_point(d);
 107                         if(part_ep==1)
 108                                 p.dir += M_PI;
 109                         return p;
 110                 }
 111                 else
 112                 {
 113                         d -= plen;
 114                         TrackPart *next = part->get_link(1-part_ep);
 115                         if(!next)
 116                                 throw InvalidParameterValue("Distance out of range");
 117                         part_ep = (next->get_link(0)==part ? 0 : 1);
 118                         part = next;
 119                 }
 120         }
 121 }
 122
 123 void TrackType::collect_endpoints()
 124 {
 125         endpoints.clear();
 126
 127         for(vector<TrackPart>::iterator i=parts.begin(); i!=parts.end(); ++i)
 128         {
 129                 for(vector<TrackPart>::iterator j=i; ++j!=parts.end();)
 130                         i->check_link(*j);
 131
 132                 unsigned n_part_eps = (i->is_dead_end() ? 1 : 2);
 133                 for(unsigned j=0; j<n_part_eps; ++j)
 134                         if(!i->get_link(j))
 135                         {
 136                                 TrackPoint p = i->get_point(j ? i->get_length() : 0);
 137                                 if(j==0)
 138                                         p.dir += M_PI;
 139
 140                                 bool found = false;
 141                                 for(vector<Endpoint>::iterator k=endpoints.begin(); k!=endpoints.end(); ++k)
 142                                 {
 143                                         float dx = k->pos.x-p.pos.x;
 144                                         float dy = k->pos.y-p.pos.y;
 145
 146                                         float da = k->dir-p.dir;
 147                                         while(da>M_PI)
 148                                                 da -= M_PI*2;
 149                                         while(da<-M_PI)
 150                                                 da += M_PI*2;
 151
 152                                         if(dx*dx+dy*dy<1e-6 && da>-0.01 && da<0.01)
 153                                         {
 154                                                 k->paths |= 1<<i->get_path();
 155                                                 found = true;
 156                                                 break;
 157                                         }
 158                                 }
 159
 160                                 if(!found)
 161                                         endpoints.push_back(Endpoint(p.pos.x, p.pos.y, p.dir, 1<<i->get_path()));
 162                         }
 163         }
 164 }
 165
 166 TrackType::Endpoint::Endpoint(float x, float y, float d, unsigned p):
 167         pos(x, y),
 168         dir(d),
 169         paths(p)
 170 { }
 171
 172
 173 TrackType::Loader::Loader(TrackType &t):
 174         Msp::DataFile::BasicLoader<TrackType>(t),
 175         state_bits_set(false)
 176 {
 177         add("autofit_preference", &TrackType::autofit_preference);
 178         add("description", &TrackType::description);
 179         add("object",      &TrackType::object);
 180         add("state_bits",  &Loader::state_bits);
 181         add("part",        &Loader::part);
 182 }
 183
 184 void TrackType::Loader::finish()
 185 {
 186         obj.collect_endpoints();
 187 }
 188
 189 void TrackType::Loader::part()
 190 {
 191         TrackPart p;
 192         load_sub(p);
 193         obj.parts.push_back(p);
 194         if(!state_bits_set && p.get_path())
 195                 while(p.get_path()>=(1U<<obj.state_bits))
 196                         ++obj.state_bits;
 197 }
 198
 199 void TrackType::Loader::state_bits(unsigned b)
 200 {
 201         obj.state_bits = b;
 202         state_bits_set = true;
 203 }
 204
 205 } // namespace R2C2