/**
* Prepare a list of modified entities on this frame.
*
* @return List<SpriteEntity>
*/
private List<SpriteEntity> getModifiedEntities() {
List<SpriteEntity> returned = new ArrayList<SpriteEntity>();
for (SpriteEntity entity : spriteEntities) {
int id = entity.getId();
SpriteEntity backedUp = backupEntities.get(id);
if (backedUp == null) {
// If this entity hasn't been backed up, it's a new one ==> we
// send it
returned.add(entity);
} else {
// If this entity has been backed up, we must check whether it
// has changed
if (!backedUp.isSame(entity)) {
returned.add(entity);
}
backupEntities.remove(id);
}
}
// Send the entity which has been removed this frame
for (SpriteEntity entity : backupEntities.values()) {
entity.dying = true;
entity.clientSpecific = false; // Send to all clients
returned.add(entity);
}
backupEntities.clear();
return returned;
}
