source/libr2c2/tracktype.cpp

   1 #include <cmath>
   2 #include <msp/geometry/union.h>
   3 #include "tracktype.h"
   4
   5 using namespace std;
   6 using namespace Msp;
   7
   8 namespace R2C2 {
   9
  10 TrackType::TrackType(const ArticleNumber &an, const TrackAppearance &ta):
  11         ObjectType(an),
  12         appearance(ta),
  13         state_bits(0),
  14         autofit_preference(1)
  15 { }
  16
  17 float TrackType::get_total_length() const
  18 {
  19         return get_path_length(-1);
  20 }
  21
  22 float TrackType::get_path_length(int p) const
  23 {
  24         float len = 0;
  25         for(vector<TrackPart>::const_iterator i=parts.begin(); i!=parts.end(); ++i)
  26                 if(p<0 || i->get_path()==static_cast<unsigned>(p))
  27                         len += i->get_length();
  28         return len;
  29 }
  30
  31 unsigned TrackType::get_paths() const
  32 {
  33         unsigned mask = 0;
  34         for(vector<TrackPart>::const_iterator i=parts.begin(); i!=parts.end(); ++i)
  35                 mask |= 1<<i->get_path();
  36         return mask;
  37 }
  38
  39 unsigned TrackType::get_n_paths() const
  40 {
  41         unsigned n = 0;
  42         for(unsigned mask = get_paths(); mask; ++n)
  43                 mask &= mask-1;
  44         return n;
  45 }
  46
  47 bool TrackType::is_turnout() const
  48 {
  49         return endpoints.size()>2;
  50 }
  51
  52 bool TrackType::is_dead_end() const
  53 {
  54         return endpoints.size()<2;
  55 }
  56
  57 const TrackType::Endpoint &TrackType::get_endpoint(unsigned i) const
  58 {
  59         if(i>=endpoints.size())
  60                 throw out_of_range("TrackType::get_endpoint");
  61
  62         return endpoints[i];
  63 }
  64
  65 OrientedPoint TrackType::get_point(unsigned epi, unsigned path, float d) const
  66 {
  67         if(epi>=endpoints.size())
  68                 throw out_of_range("TrackType::get_point");
  69
  70         const TrackPart *part = 0;
  71         unsigned part_ep = 0;
  72         for(vector<TrackPart>::const_iterator i=parts.begin(); i!=parts.end(); ++i)
  73         {
  74                 if(endpoints[epi].has_path(path) && i->get_path()!=path)
  75                         continue;
  76
  77                 unsigned n_part_eps = (i->is_dead_end() ? 1 : 2);
  78                 for(unsigned j=0; j<n_part_eps; ++j)
  79                 {
  80                         OrientedPoint p = i->get_point(j ? i->get_length() : 0);
  81                         Vector span = p.position-endpoints[epi].pos;
  82                         if(dot(span, span)<1e-6)
  83                         {
  84                                 part = &*i;
  85                                 part_ep = j;
  86                         }
  87                 }
  88         }
  89
  90         if(!part)
  91                 throw logic_error("internal error (endpoint does not match any part)");
  92
  93         while(1)
  94         {
  95                 float plen = part->get_length();
  96                 if(d<=plen)
  97                 {
  98                         if(part_ep==1)
  99                                 d = plen-d;
 100                         OrientedPoint p = part->get_point(d);
 101                         if(part_ep==1)
 102                                 p.rotation += Angle::half_turn();
 103                         return p;
 104                 }
 105                 else
 106                 {
 107                         d -= plen;
 108                         TrackPart *next = part->get_link(1-part_ep);
 109                         if(!next)
 110                                 throw invalid_argument("TrackType::get_point");
 111                         part_ep = (next->get_link(0)==part ? 0 : 1);
 112                         part = next;
 113                 }
 114         }
 115 }
 116
 117 OrientedPoint TrackType::get_nearest_point(const Vector &p) const
 118 {
 119         OrientedPoint result;
 120         float dist = -1;
 121
 122         for(vector<TrackPart>::const_iterator i=parts.begin(); i!=parts.end(); ++i)
 123         {
 124                 OrientedPoint n = i->get_nearest_point(p);
 125                 float d = distance(n.position, p);
 126                 if(d<dist || dist<0)
 127                 {
 128                         result = n;
 129                         dist = d;
 130                 }
 131         }
 132
 133         return result;
 134 }
 135
 136 void TrackType::collect_endpoints()
 137 {
 138         endpoints.clear();
 139
 140         for(vector<TrackPart>::iterator i=parts.begin(); i!=parts.end(); ++i)
 141         {
 142                 for(vector<TrackPart>::iterator j=i; ++j!=parts.end();)
 143                         i->check_link(*j);
 144
 145                 unsigned n_part_eps = (i->is_dead_end() ? 1 : 2);
 146                 for(unsigned j=0; j<n_part_eps; ++j)
 147                         if(!i->get_link(j))
 148                         {
 149                                 OrientedPoint p = i->get_point(j ? i->get_length() : 0);
 150                                 if(j==0)
 151                                         p.rotation += Angle::half_turn();
 152
 153                                 bool found = false;
 154                                 for(vector<Endpoint>::iterator k=endpoints.begin(); k!=endpoints.end(); ++k)
 155                                 {
 156                                         Vector d = k->pos-p.position;
 157
 158                                         Angle da = wrap_balanced(k->dir-p.rotation);
 159
 160                                         if(dot(d, d)<1e-6 && abs(da).radians()<0.01)
 161                                         {
 162                                                 k->paths |= 1<<i->get_path();
 163                                                 found = true;
 164                                                 break;
 165                                         }
 166                                 }
 167
 168                                 if(!found)
 169                                         endpoints.push_back(Endpoint(p.position.x, p.position.y, p.rotation, 1<<i->get_path()));
 170                         }
 171         }
 172 }
 173
 174 TrackType::Endpoint::Endpoint(float x, float y, const Angle &d, unsigned p):
 175         pos(x, y, 0),
 176         dir(d),
 177         paths(p)
 178 { }
 179
 180
 181 TrackType::Loader::Loader(TrackType &t):
 182         DataFile::DerivedObjectLoader<TrackType, ObjectType::Loader>(t),
 183         state_bits_set(false)
 184 {
 185         add("autofit_preference", &TrackType::autofit_preference);
 186         add("object",      &TrackType::object);
 187         add("state_bits",  &Loader::state_bits);
 188         add("part",        &Loader::part);
 189 }
 190
 191 void TrackType::Loader::finish()
 192 {
 193         obj.collect_endpoints();
 194         vector<const Shape *> shapes;
 195         for(vector<TrackPart>::iterator i=obj.parts.begin(); i!=obj.parts.end(); ++i)
 196         {
 197                 i->create_shape();
 198                 shapes.push_back(&i->get_shape());
 199         }
 200         obj.shape = Geometry::Union<float, 3>::from_iterator_range(shapes.begin(), shapes.end()).clone();
 201 }
 202
 203 void TrackType::Loader::part()
 204 {
 205         TrackPart p;
 206         load_sub(p);
 207         obj.parts.push_back(p);
 208         if(!state_bits_set && p.get_path())
 209                 while(p.get_path()>=(1U<<obj.state_bits))
 210                         ++obj.state_bits;
 211 }
 212
 213 void TrackType::Loader::state_bits(unsigned b)
 214 {
 215         obj.state_bits = b;
 216         state_bits_set = true;
 217 }
 218
 219 } // namespace R2C2