+void Train::update_speed()
+{
+ if(!target_speed)
+ {
+ loco.set_speed(0);
+ try_reserve = Time::TimeStamp();
+ set_status("Stopped");
+ }
+ else
+ {
+ unsigned nsens = 0;
+ for(list<BlockRef>::const_iterator i=rsv_blocks.begin(); i!=rsv_blocks.end(); ++i)
+ if(i->block->get_sensor_id())
+ ++nsens;
+
+ unsigned slow_speed = find_speed(0.1); // 31.3 km/h
+ if(nsens==0)
+ {
+ loco.set_speed(0);
+ pure_speed = false;
+ try_reserve = Time::now()+2*Time::sec;
+ set_status("Blocked");
+ }
+ else if(nsens==1 && target_speed>slow_speed)
+ {
+ loco.set_speed(slow_speed);
+ pure_speed = false;
+ try_reserve = Time::now()+2*Time::sec;
+ set_status("Slow");
+ }
+ else
+ {
+ loco.set_speed(target_speed);
+ try_reserve = Time::TimeStamp();
+ set_status(format("Traveling %d kmh", travel_speed));
+ }
+ }
+}
+
+float Train::get_real_speed(unsigned i) const
+{
+ if(real_speed[i].weight)
+ return real_speed[i].speed;
+
+ unsigned low;
+ unsigned high;
+ for(low=i; low>0; --low)
+ if(real_speed[low].weight)
+ break;
+ for(high=i; high<14; ++high)
+ if(real_speed[high].weight)
+ break;
+
+ if(real_speed[high].weight)
+ {
+ if(real_speed[low].weight)
+ {
+ float f = float(i-low)/(high-low);
+ return real_speed[low].speed*(1-f)+real_speed[high].speed*f;
+ }
+ else
+ return real_speed[high].speed*float(i)/high;
+ }
+ else if(real_speed[low].weight)
+ return real_speed[low].speed*float(i)/low;
+ else
+ return 0;
+}
+
+unsigned Train::find_speed(float real) const
+{
+ if(real<=real_speed[0].speed)
+ return 0;
+
+ unsigned low = 0;
+ unsigned high = 0;
+ for(unsigned i=0; (!high && i<=14); ++i)
+ if(real_speed[i].weight)
+ {
+ if(real_speed[i].speed<real)
+ low = i;
+ else
+ high = i;
+ }
+ if(!high)
+ {
+ if(!low)
+ return 0;
+ return min(static_cast<unsigned>(low*real/real_speed[low].speed), 14U);
+ }
+
+ float f = (real-real_speed[low].speed)/(real_speed[high].speed-real_speed[low].speed);
+ return static_cast<unsigned>(low*(1-f)+high*f+0.5);
+}
+