/**
* Sets a new grid for this world. Occupants are transferred from the old world to the new.
*
* @param newGrid the new grid
*/
public void setGrid(Grid<T> newGrid) {
Grid<T> oldGrid = world.getGrid();
Map<Location, T> occupants = new HashMap<Location, T>();
for (Location loc : oldGrid.getOccupiedLocations()) occupants.put(loc, world.remove(loc));
world.setGrid(newGrid);
for (Location loc : occupants.keySet()) {
if (newGrid.isValid(loc)) world.add(loc, occupants.get(loc));
}
display.setGrid(newGrid);
repaint();
}
