/**
* Returns the first entity under a point of the map, in the specified layer.
*
* @param layer the layer
* @param x x of the point
* @param y y of the point
* @return the entity found, or null if there is no entity here
*/
public MapEntity getEntityAt(Layer layer, int x, int y) {
MapEntities entities = allEntities[layer.getId()];
ListIterator<MapEntity> iterator = entities.listIterator(entities.size());
while (iterator.hasPrevious()) {
MapEntity entity = iterator.previous();
if (entity.containsPoint(x, y)) {
return entity;
}
}
return null;
}
/**
* Brings the specified entities to the back, keeping their layer. The order of the specified
* entities in the map is unchanged.
*
* @param entities the entities to move
*/
public void bringToBack(List<MapEntity> entities) {
List<MapEntity> sortedEntities = getSortedEntities(entities);
// bring to back each entity from sortedEntities
ListIterator<MapEntity> iterator = sortedEntities.listIterator(sortedEntities.size());
while (iterator.hasPrevious()) {
MapEntity entity = iterator.previous();
Layer layer = entity.getLayer();
allEntities[layer.getId()].remove(entity);
allEntities[layer.getId()].addFirst(entity);
}
setChanged();
notifyObservers();
}