Question

我有一个重力为0的运动体，我希望从特定点移动到我世界坐标中的特定点。我已尝试从here调整代码到下面的一个。但身体保持静止不动？

  @Override
    public void act(float delta) {
    super.act(delta);

    //Target position in world coordinates
    Vector2 targetPosition = new Vector2(4.5142856f, -4.228572f);

    //target speed
    float targetSpeed = 1f;

    //direction
    Vector2 direction = targetPosition.sub(body.getPosition());

    //distance
    float distanceToTravel = direction.nor().len2();

    // For most of the movement, the target speed is ok
    float speedToUse = targetSpeed;

    float distancePerTimestep = speedToUse / 60.0f;
    if ( distancePerTimestep > distanceToTravel )
        speedToUse *= ( distanceToTravel / distancePerTimestep );

    Vector2 desiredVelocity = direction.scl(speedToUse);
    Vector2 changeInVelocity = desiredVelocity.sub(body.getLinearVelocity());

    Vector2 force = new Vector2(changeInVelocity.scl(body.getMass() * 60.0f));
    System.out.println(force);

    body.applyForce(force, body.getWorldCenter(), true);

}

Answer 1

好的我明白了。下面的方法将返回正确的速度，以便身体可以到达目标点。

public Vector2 calculateVelocity(Vector2 target) {
    Vector2 direction = new Vector2(target.x - body.getPosition().x, target.y - body.getPosition().y ).nor();
    float speed = Constants.enemySpeed;
    return new Vector2( speed * direction.x, speed * direction.y );
}

将身体以恒定速度移动到世界坐标中的特定点

1 个答案: