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扣丁學(xué)堂Unity3D培訓(xùn)之實(shí)現(xiàn)鼠標(biāo)控制旋轉(zhuǎn)轉(zhuǎn)盤

2019-02-21 17:19:32 2167瀏覽

ModelScreenPos = camera.WorldToScreenPoint(Model.transform.position);

這里有個(gè)聲明，這個(gè)模型代表的是轉(zhuǎn)盤，而且要保證模型的中心點(diǎn)在轉(zhuǎn)盤中心。然后我們就要計(jì)算鼠標(biāo)以模型在屏幕坐標(biāo)為中心點(diǎn)的旋轉(zhuǎn)偏移量。我們開始以鼠標(biāo)按下的瞬間，偏移量為0，然后進(jìn)行每幀計(jì)算偏移量。偏移量也就是旋轉(zhuǎn)角度，很好計(jì)算，就是求兩個(gè)向量的夾角。角度angle=Vector2.Angle(OA,OB);

q = Quaternion.FromToRotation(OA, OB);

private Vector2 ModelPos;
  private Vector2 mousePos; //當(dāng)前鼠標(biāo)位置
  private Vector2 premousePos;//上一幀鼠標(biāo)位置
  private Quaternion q; 
  private float RotateAngle;
  private Vector3 localEluer; //模型歐拉角存儲(chǔ)變量
  
  private bool IsSelect = false;
  void Start()
  {
    ModelPos = camera.WorldToScreenPoint(go.transform.position);
    angle = localEluer.x = info.opening;
    go.transform.localEulerAngles = localEluer;
  }
  
  public virtual void Update()
  {
    if (Input.GetMouseButtonDown(0)&&modelCamera.IsTouch())
    {
      IsSelect = true;
      premousePos = mousePos=Input.mousePosition; //每次重新點(diǎn)擊的時(shí)候都重置鼠標(biāo)上一幀點(diǎn)擊坐標(biāo)
    }
    if (Input.GetMouseButton(0)&& IsSelect)
    {
      mousePos = Input.mousePosition;
      RotateAngle = Vector2.Angle(premousePos - ModelPos, mousePos - ModelPos);
      //Debug.Log("RotateAngle+"+RotateAngle);
      if (RotateAngle == 0)
      {
        premousePos = mousePos;
      }
      else
      {
        q = Quaternion.FromToRotation(premousePos - ModelPos, mousePos - ModelPos);
        float k = q.z > 0 ? 1 : -1;
        localEluer.x += k * RotateAngle;
        //Debug.Log(localEluer.x);
        angle = localEluer.x = Mathf.Clamp(localEluer.x, 0, AllowAngle); //這里是項(xiàng)目需要 限制一下旋轉(zhuǎn)圈數(shù)
        go.transform.localEulerAngles = localEluer;
        premousePos = mousePos;
      }
    }
    if (Input.GetMouseButtonUp(0))
    {
      IsSelect = false;
    }  
  }