/*
* Copyright 2013 MovingBlocks
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.terasology.logic.selection;
import org.terasology.entitySystem.entity.EntityRef;
import org.terasology.entitySystem.event.ReceiveEvent;
import org.terasology.entitySystem.systems.BaseComponentSystem;
import org.terasology.entitySystem.systems.RegisterMode;
import org.terasology.entitySystem.systems.RegisterSystem;
import org.terasology.input.cameraTarget.CameraTargetChangedEvent;
import org.terasology.logic.common.ActivateEvent;
import org.terasology.logic.location.LocationComponent;
import org.terasology.logic.players.LocalPlayer;
import org.terasology.registry.In;
import org.terasology.world.selection.BlockSelectionComponent;
import org.terasology.world.selection.event.SetBlockSelectionEndingPointEvent;
import org.terasology.world.selection.event.SetBlockSelectionStartingPointEvent;
/**
* System to allow the use of BlockSelectionComponents. This system is a client only system, though no other player
* will see selections done by one player. This system uses an item's activate event to both start and end a selection,
* then triggers a ApplyBlockSelectionEvent event.
*
*/
@RegisterSystem(RegisterMode.CLIENT)
public class LocalPlayerBlockSelectionByItemSystem extends BaseComponentSystem {
@In
private LocalPlayer localPlayer;
private EntityRef blockSelectionComponentEntity;
@ReceiveEvent(components = {OnItemActivateSelectionComponent.class})
public void onPlaced(ActivateEvent event, EntityRef itemEntity) {
if (event.getTargetLocation() == null) {
return;
}
EntityRef targetLocationEntity = event.getTarget();
this.blockSelectionComponentEntity = itemEntity;
BlockSelectionComponent blockSelectionComponent = itemEntity.getComponent(BlockSelectionComponent.class);
if (null == blockSelectionComponent.startPosition) {
// on the first item click, we start selecting blocks
targetLocationEntity.send(new SetBlockSelectionStartingPointEvent(itemEntity));
blockSelectionComponent.shouldRender = true;
} else {
// on the second item click, we will set the ending selection point and send an ApplyBlockSelectionEvent
targetLocationEntity.send(new SetBlockSelectionEndingPointEvent(itemEntity));
localPlayer.getCharacterEntity().send(new ApplyBlockSelectionEvent(itemEntity, blockSelectionComponent.currentSelection));
blockSelectionComponent.shouldRender = false;
blockSelectionComponent.currentSelection = null;
blockSelectionComponent.startPosition = null;
}
}
@ReceiveEvent(components = {LocationComponent.class})
public void onCamTargetChanged(CameraTargetChangedEvent event, EntityRef entity) {
// This method will update the block selection to whatever block is targeted in the players view
if (null == blockSelectionComponentEntity) {
return;
}
BlockSelectionComponent blockSelectionComponent = blockSelectionComponentEntity.getComponent(BlockSelectionComponent.class);
if (blockSelectionComponent.startPosition == null) {
return;
}
EntityRef target = event.getNewTarget();
target.send(new SetBlockSelectionEndingPointEvent(blockSelectionComponentEntity));
}
}