Integrating gdx-ai's steering behaviours with Ashley and Box2D

PhysicsSystem_extract.java

        // apply steering behaviors
        ImmutableArray<Entity> entities = engine.getEntitiesFor(Family.getFor(SteerAgentComponent.class));
        for(int i = 0; i < entities.size(); i++) {
            Entity e = entities.get(i);
            Body body = e.getComponent(PhysicalBodyComponent.class).body;

            SteerAgentComponent steer = e.getComponent(SteerAgentComponent.class);
            if(steer.steeringBehavior == null) {
                continue;
            }

            steer.steeringBehavior.calculateSteering(steer.steeringOutput);

            Vector2 linear_force = steer.steeringOutput.linear.cpy();
            linear_force.scl(body.getMass());
            body.applyForceToCenter(linear_force, true);

            body.applyTorque(steer.steeringOutput.angular*body.getInertia(), true);
        }

        // step the simulation
        world.step(Constants.PHYSICS_TIME_STEP, Constants.PHYSICS_VELOCITY_ITERATIONS, Constants.PHYSICS_POSITION_ITERATIONS);