public static boolean hasArrived(Entity entity) {
EnemyMovement enemyMovement = EntityUtil.getComponent(entity, EnemyMovement.class);
Vector2 intent = enemyMovement.getIntent().cpy();
Vector2 position = PhysicsUtil.getPosition(entity);
intent.y = position.y;
return position.epsilonEquals(intent, Constants.GAME.EPSILON);
}
public static void chase(Entity chaser, Entity target, boolean isHorizontal) {
Body targetBody = EntityUtil.getComponent(target, Physics.class).getBody();
if (isHorizontal) {
moveEnemyTo(chaser, targetBody.getPosition());
} else {
moveTo(chaser, targetBody.getPosition());
}
}
public static void drag(Entity enemy, Vector2 target, float force, int duration) {
EnemyMovement movement = EntityUtil.getComponent(enemy, EnemyMovement.class);
if (movement != null) {
movement.setDraggedTo(target);
movement.setDragForce(force);
movement.setDragDuration(duration);
movement.setStartDrag(TimeUtil.getGameTime());
movement.setDraggedFrom(PhysicsUtil.getPosition(enemy));
}
}
public static void moveEnemyTo(Entity entity, Vector2 destination) {
if (!EntityUtil.isEnemy(entity)) {
return;
}
Body body = EntityUtil.getComponent(entity, Physics.class).getBody();
destination.y = body.getPosition().y;
moveTo(entity, destination);
}
public static void use(Entity entity, String name) {
Ability abilityComponent = EntityUtil.getComponent(entity, Ability.class);
if (abilityComponent == null) {
return;
}
AbilityInfo ability = abilityComponent.getAbility(name);
if (ability == null) {
return;
}
ability.getAbility().cast(entity);
ability.setLastCast(TimeUtil.getGameTime());
}
public static boolean isAvailable(Entity entity, String name) {
Ability abilityComponent = EntityUtil.getComponent(entity, Ability.class);
if (abilityComponent == null) {
return false;
}
AbilityInfo ability = abilityComponent.getAbility(name);
if (ability == null) {
return false;
}
long lastCast = ability.getLastCast();
return lastCast == -1 || (TimeUtil.getGameTime() - lastCast > ability.getCooldown());
}
public static void moveTo(Entity entity, Vector2 destination) {
Physics physicsComponent = EntityUtil.getComponent(entity, Physics.class);
Body body = physicsComponent.getBody();
float mass = body.getMass();
Vector2 currentVelocity = body.getLinearVelocity();
Vector2 position = body.getPosition();
Vector2 desiredVelocity =
destination.cpy().sub(position).nor().scl(physicsComponent.getMaxSpeed());
Vector2 impulse = desiredVelocity.sub(currentVelocity).scl(mass);
PhysicsUtil.applyImpulse(entity, impulse);
}
public static void setTarget(Entity enemy, Vector2 target) {
EnemyMovement movement = EntityUtil.getComponent(enemy, EnemyMovement.class);
if (movement != null) {
movement.setIntent(target);
}
}
