void pointer_motion(int, int);
void view_all();
void set_block_color(const Marklin::Block &, const Msp::GL::Color &);
void reset_block_color(const Marklin::Block &);
void sensor_event(bool, Marklin::Sensor *);
void block_reserved(const Marklin::Block &, const Marklin::Train *);
void pointer_motion(int, int);
void view_all();
void set_block_color(const Marklin::Block &, const Msp::GL::Color &);
void reset_block_color(const Marklin::Block &);
void sensor_event(bool, Marklin::Sensor *);
void block_reserved(const Marklin::Block &, const Marklin::Train *);