3 This file is part of the MSP Märklin suite
4 Copyright © 2010 Mikkosoft Productions, Mikko Rasa
5 Distributed under the GPL
13 #include "tracktype.h"
15 #include "vehicletype.h"
22 Vehicle::Vehicle(Layout &l, const VehicleType &t):
28 bogie_dirs(type.get_bogies().size()),
32 layout.add_vehicle(*this);
41 layout.remove_vehicle(*this);
44 void Vehicle::attach_back(Vehicle &veh)
47 throw InvalidState("Already attached");
56 void Vehicle::attach_front(Vehicle &veh)
59 throw InvalidState("Already attached");
65 prev->propagate_backward();
68 void Vehicle::detach_back()
71 throw InvalidState("Not attached");
77 void Vehicle::detach_front()
80 throw InvalidState("Not attached");
86 void Vehicle::place(Track &t, unsigned e, float o, PlaceMode m)
88 track_pos = TrackPosition(&t, e, o);
91 track_pos.advance(-type.get_front_axle_offset());
92 else if(m==FRONT_BUFFER)
93 track_pos.advance(-type.get_length()/2);
95 track_pos.advance(-type.get_back_axle_offset());
96 else if(m==BACK_BUFFER)
97 track_pos.advance(type.get_length()/2);
100 propagate_position();
103 void Vehicle::unplace()
108 track_pos = TrackPosition();
116 void Vehicle::advance(float d)
118 track_pos.advance(d);
120 propagate_position();
123 float Vehicle::get_bogie_direction(unsigned i) const
125 if(i>=bogie_dirs.size())
126 throw InvalidParameterValue("Bogie index out of range");
127 return bogie_dirs[i];
130 void Vehicle::update_position()
134 const vector<VehicleType::Axle> &axles = type.get_axles();
135 const vector<VehicleType::Bogie> &bogies = type.get_bogies();
138 float wheelbase = axles.front().position-axles.back().position;
139 tp = get_point(track_pos, wheelbase, -axles.back().position/wheelbase);
141 else if(bogies.size()>=2)
143 TrackPosition front = track_pos;
144 front.advance(bogies.front().position);
145 TrackPosition back = track_pos;
146 back.advance(bogies.back().position);
147 float bogie_spacing = bogies.front().position-bogies.back().position;
148 adjust_for_distance(front, back, bogie_spacing);
150 const vector<VehicleType::Axle> &front_axles = bogies.front().axles;
151 float wheelbase = front_axles.front().position-front_axles.back().position;
152 TrackPoint front_point = get_point(front, wheelbase, -front_axles.back().position/wheelbase);
154 const vector<VehicleType::Axle> &back_axles = bogies.back().axles;
155 wheelbase = back_axles.front().position-back_axles.back().position;
156 TrackPoint back_point = get_point(back, wheelbase, -back_axles.back().position/wheelbase);
158 tp = get_point(front_point.pos, back_point.pos, -bogies.back().position/bogie_spacing);
160 bogie_dirs.front() = front_point.dir-tp.dir;
161 bogie_dirs.back() = back_point.dir-tp.dir;
164 tp = track_pos.get_point();
167 check_sensor(type.get_front_axle_offset(), front_sensor);
169 check_sensor(type.get_back_axle_offset(), back_sensor);
172 position.z += layout.get_catalogue().get_rail_elevation();
176 void Vehicle::update_position_from(const Vehicle &veh)
178 int sign = (&veh==prev ? -1 : 1);
180 float tdist = (type.get_length()+veh.type.get_length())/2;
181 float margin = layout.get_catalogue().get_scale();
183 float dist = distance(veh.position, position);
184 if(dist<tdist-margin || dist>tdist+margin)
186 track_pos = veh.track_pos;
187 track_pos.advance(sign*tdist);
190 dist = distance(veh.position, position);
193 track_pos.advance(sign*(tdist-dist));
197 void Vehicle::propagate_position()
202 propagate_backward();
205 void Vehicle::propagate_forward()
207 prev->update_position_from(*this);
210 prev->propagate_forward();
213 void Vehicle::propagate_backward()
215 next->update_position_from(*this);
218 next->propagate_backward();
221 void Vehicle::check_sensor(float offset, unsigned &sensor)
223 TrackPosition pos = track_pos;
225 unsigned s = pos.track->get_sensor_id();
228 /* Sensor ID under axle has changed. Deduce movement direction by using
229 the sensor ID under the midpoint of the vehicle. */
230 /* XXX This depends on the simulation running fast enough. Something
231 more robust would be preferable. */
232 unsigned old = sensor;
234 unsigned mid = track_pos.track->get_sensor_id();
237 /* There's a sensor and it's different from mid. We've just entered
239 layout.get_driver().set_sensor(sensor, true);
241 /* A sensor was under the axle and it was different from mid. We've
242 just left that sensor. */
243 layout.get_driver().set_sensor(old, false);
247 void Vehicle::adjust_for_distance(TrackPosition &front, TrackPosition &back, float tdist, float ratio) const
249 float margin = 0.01*layout.get_catalogue().get_scale();
253 Point front_point = front.get_point().pos;
254 Point back_point = back.get_point().pos;
256 float dx = front_point.x-back_point.x;
257 float dy = front_point.y-back_point.y;
258 float dz = front_point.z-back_point.z;
259 float dist = sqrt(dx*dx+dy*dy+dz*dz);
261 float diff = tdist-dist;
262 if(diff<-margin && adjust_dir<=0)
267 else if(diff>margin && adjust_dir>=0)
275 front.advance(diff*(1-ratio));
276 back.advance(-diff*ratio);
280 TrackPoint Vehicle::get_point(const Point &front, const Point &back, float ratio) const
282 float dx = front.x-back.x;
283 float dy = front.y-back.y;
284 float dz = front.z-back.z;
287 tp.pos = Point(back.x+dx*ratio, back.y+dy*ratio, back.z+dz*ratio);
288 tp.dir = atan2(dy, dx);
293 TrackPoint Vehicle::get_point(const TrackPosition &pos, float tdist, float ratio) const
295 TrackPosition front = pos;
296 front.advance(tdist*(1-ratio));
298 TrackPosition back = pos;
299 back.advance(-tdist*ratio);
301 adjust_for_distance(front, back, tdist, ratio);
302 return get_point(front.get_point().pos, back.get_point().pos, ratio);
306 Vehicle::TrackPosition::TrackPosition():
312 Vehicle::TrackPosition::TrackPosition(Track *t, unsigned e, float o):
318 void Vehicle::TrackPosition::advance(float d)
323 unsigned path = track->get_active_path();
326 float path_len = track->get_type().get_path_length(path);
327 while(track && offs>=path_len)
329 unsigned out = track->traverse(ep, path);
330 Track *next = track->get_link(out);
334 ep = next->get_endpoint_by_link(*track);
338 path = track->get_active_path();
339 path_len = track->get_type().get_path_length(path);
345 while(track && offs<0)
347 Track *prev = track->get_link(ep);
350 unsigned in = prev->get_endpoint_by_link(*track);
353 path = track->get_active_path();
354 ep = track->traverse(in, path);
356 path_len = track->get_type().get_path_length(path);
370 TrackPoint Vehicle::TrackPosition::get_point() const
373 return track->get_point(ep, offs);
378 } // namespace Marklin