/*******************************************************************************
* Copyright 2014 See AUTHORS file.
*
* 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 com.badlogic.ashley.tests;
import com.badlogic.ashley.core.ComponentMapper;
import com.badlogic.ashley.core.Engine;
import com.badlogic.ashley.core.Entity;
import com.badlogic.ashley.core.EntityListener;
import com.badlogic.ashley.core.EntitySystem;
import com.badlogic.ashley.core.Family;
import com.badlogic.ashley.core.PooledEngine;
import com.badlogic.ashley.tests.components.MovementComponent;
import com.badlogic.ashley.tests.components.PositionComponent;
import com.badlogic.ashley.utils.ImmutableArray;
public class BasicTest {
public static void main(String[] args){
PooledEngine engine = new PooledEngine();
MovementSystem movementSystem = new MovementSystem();
PositionSystem positionSystem = new PositionSystem();
engine.addSystem(movementSystem);
engine.addSystem(positionSystem);
Listener listener = new Listener();
engine.addEntityListener(listener);
for(int i=0; i<10; i++){
Entity entity = engine.createEntity();
entity.add(new PositionComponent(10, 0));
if(i > 5)
entity.add(new MovementComponent(10, 2));
engine.addEntity(entity);
}
log("MovementSystem has: " + movementSystem.entities.size() + " entities.");
log("PositionSystem has: " + positionSystem.entities.size() + " entities.");
for(int i=0; i<10; i++){
engine.update(0.25f);
if(i > 5)
engine.removeSystem(movementSystem);
}
engine.removeEntityListener(listener);
}
public static class PositionSystem extends EntitySystem {
public ImmutableArray<Entity> entities;
@Override
public void addedToEngine(Engine engine) {
entities = engine.getEntitiesFor(Family.getFor(PositionComponent.class));
log("PositionSystem added to engine.");
}
@Override
public void removedFromEngine(Engine engine) {
log("PositionSystem removed from engine.");
entities = null;
}
}
public static class MovementSystem extends EntitySystem {
public ImmutableArray<Entity> entities;
private ComponentMapper<PositionComponent> pm = ComponentMapper.getFor(PositionComponent.class);
private ComponentMapper<MovementComponent> mm = ComponentMapper.getFor(MovementComponent.class);
@Override
public void addedToEngine(Engine engine) {
entities = engine.getEntitiesFor(Family.getFor(PositionComponent.class, MovementComponent.class));
log("MovementSystem added to engine.");
}
@Override
public void removedFromEngine(Engine engine) {
log("MovementSystem removed from engine.");
entities = null;
}
@Override
public void update(float deltaTime) {
for (int i = 0; i < entities.size(); ++i){
Entity e = entities.get(i);
PositionComponent p = pm.get(e);
MovementComponent m = mm.get(e);
p.x += m.velocityX * deltaTime;
p.y += m.velocityY * deltaTime;
}
log(entities.size() + " Entities updated in MovementSystem.");
}
}
public static class Listener implements EntityListener {
@Override
public void entityAdded(Entity entity) {
log("Entity added " + entity);
}
@Override
public void entityRemoved(Entity entity) {
log("Entity removed " + entity);
}
}
public static void log(String string){
System.out.println(string);
}
}