Method IsWorldBoundary

avida-core/source/main/cMultiProcessWorld.cc:228–256

! Returns true if the given cell is on the boundary of the world, false otherwise. */

/*! Returns true if the given cell is on the boundary of the world, false otherwise.
 */
bool cMultiProcessWorld::IsWorldBoundary(const cPopulationCell& cell) {
	if(GetConfig().BIRTH_METHOD.Get()==POSITION_OFFSPRING_RANDOM) {
		int x, y;
		cell.GetPosition(x,y);
		
		// if this cell isn't on the boundary of this world, then there's no way that
		// it can cause a migration, regardless of world geometry.
		if(!((x == 0) || (x == (GetConfig().WORLD_X.Get()-1)) || (y == 0) || (y == (GetConfig().WORLD_Y.Get()-1)))) {
			return false;
		}
		
		switch(GetConfig().WORLD_GEOMETRY.Get()) {
			case nGeometry::GRID: { // bounded grid: prevent the universe boundary cells from causing migrations.
				int uni_x = x + GetConfig().WORLD_X.Get() * m_universe_x;
				int uni_y = y + GetConfig().WORLD_Y.Get() * m_universe_y;
				return !((uni_x == 0) || (uni_x == (GetConfig().WORLD_X.Get() * m_universe_dim-1))
								 || (uni_y == 0) || (uni_y == (GetConfig().WORLD_Y.Get() * m_universe_dim-1)));
			}				
			case nGeometry::TORUS: { // torus: this always results in a migration (because, if we reached
				// here, we know the cell is on the boundary).
				return true;
			}
			default: {
				GetDriver().RaiseFatalException(-1, "Only bounded grid and toroidal geometries are supported for cell migration.");
			}
		}
	}
	return false;	
}


/*! Process post-update events.