PhysicsSystem.java

package com.gdxjam.systems;

import com.badlogic.ashley.core.Engine;
import com.badlogic.ashley.core.EntitySystem;
import com.badlogic.gdx.math.Vector2;
import com.badlogic.gdx.physics.box2d.Body;
import com.badlogic.gdx.physics.box2d.BodyDef;
import com.badlogic.gdx.physics.box2d.World;
import com.badlogic.gdx.utils.Disposable;
import com.gdxjam.GameManager;

public class PhysicsSystem extends EntitySystem implements Disposable {

	public static final float TIME_STEP = 1.0f / 60.f;
	public static final int VELOCITY_ITERATIONS = 8;
	public static final int POSITION_ITERATIONS = 8;

	private World world;

	public PhysicsSystem() {
		world = new World(new Vector2(0, 0), true);
		world.setContactListener(new GameContactListener());
	}

	@Override
	public void addedToEngine(Engine engine) {
		super.addedToEngine(engine);

	}

	@Override
	public void update(float deltaTime) {
		super.update(deltaTime);
		world.step(TIME_STEP, VELOCITY_ITERATIONS, POSITION_ITERATIONS);
	}

	public Body createBody(BodyDef def) {
		return world.createBody(def);
	}

	public void destroyBody(Body body) {
		world.destroyBody(body);
	}

	public World getWorld() {
		return world;
	}

	@Override
	public void dispose() {
		world.dispose();
	}

	@Override
	public boolean checkProcessing() {
		return !GameManager.isPaused();
	}
}