Unity 學習筆記 - 根據觸碰點施加不同方向的力

直接上程式碼

private Rigidbody2D m_rigidbody2D;

// Use this for initialization

    void Start () {

        m_rigidbody2D = GetComponent<Rigidbody2D>();

    }

private void FixedUpdate()

    {

        if (Input.touchCount > 0 && flag)

        {

            // 獲取觸碰點的座標(此為螢幕座標)

            float x_touch_position = Input.GetTouch(0).position.x;

            float y_touch_position = Input.GetTouch(0).position.y;

            // 世界座標轉換為螢幕座標 (球)

            Vector3 tempPosition = Camera.main.WorldToScreenPoint(m_rigidbody2D.transform.position);

            // 欲施加的 X 方向向量

            float vx = x_touch_position - tempPosition.x;

            // 欲施加的 Y 方向向量

            float vy = y_touch_position - tempPosition.y;

            if (vx >=0 && vy>=0)

            {

                myAngle = Vector2.Angle(new Vector2(0, 1), new Vector2(vx, vy));

                m_rigidbody2D.rotation = 90f - myAngle;

                m_rigidbody2D.AddRelativeForce(Vector2.right * speed);

                flag = false;

            }

            else if (vx < 0 && vy >= 0)

            {

                myAngle = Vector2.Angle(new Vector2(0, 1), new Vector2(vx, vy));

                m_rigidbody2D.rotation = 90f + myAngle;

                m_rigidbody2D.AddRelativeForce(Vector2.right * speed);

                flag = false;

            }

        }

    }