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;

            }

        }

    }

Unity 學習筆記 - 設置手機螢幕邊框的透明圍牆

1. 新建立GameObject ，並重新命名

2. 結構如下，位置擺在座標(0,0,0)即可，將會用腳本另外控制所在位置

3. 在WallManager下掛在新建之腳本WallManager.cs

4. 腳本內容

public class WallManager : MonoBehaviour {

    private BoxCollider2D rightWall;

    private BoxCollider2D leftWall;

    private BoxCollider2D upWall;

    private BoxCollider2D downWall;

    // Use this for initialization

    void Start () {

        ResetWall();

    }

    

     // Update is called once per frame

     void Update () {

         

     }

    void ResetWall()

    {

        // 定義螢幕外的圍牆位置

        rightWall = transform.Find("rightWall").GetComponent<BoxCollider2D>();

        leftWall = transform.Find("leftWall").GetComponent<BoxCollider2D>();

        upWall = transform.Find("upWall").GetComponent<BoxCollider2D>();

        downWall = transform.Find("downWall").GetComponent<BoxCollider2D>();

        Vector3 tempPosition = Camera.main.ScreenToWorldPoint(new Vector2(Screen.width, Screen.height));

        upWall.transform.position = new Vector3(0, tempPosition.y + 0.5f, 0);

        upWall.size = new Vector2(tempPosition.x * 2, 1);

        downWall.transform.position = new Vector3(0, -tempPosition.y - 0.5f, 0);

        downWall.size = new Vector2(tempPosition.x * 2, 1);

        leftWall.transform.position = new Vector3(-tempPosition.x - 0.5f, 0, 0);

        leftWall.size = new Vector2(1, tempPosition.y * 2);

        rightWall.transform.position = new Vector3(tempPosition.x + 0.5f, 0, 0);

        rightWall.size = new Vector2(1, tempPosition.y * 2);

    }

}

Unity 學習筆記 - 彈球屬性設置(2D)

欲設置一顆會不斷反彈的彈球，屬性設置如下:

1. 添加 Rigibody 2D 及 Circle Collider 2D 組件

-- Rigibody 2D組件中，將Gravity Scale (重力)調整為 0 ，如此才不會受到重力影響

-- Circle Collider 2D組件中，添加 Material 材質