WPF Image觸摸移動方法

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   1:  TouchPoint mPoint = null;

   2:  double mOffsetX;//水平捲軸當前位置

   3:  double mOffsetY;//垂直捲軸當前位置

   4:  bool mIsTouch = false;//是否觸摸

   5:  //觸摸事件

   6:  private void mScrollViewer_TouchDown(object sender, TouchEventArgs e)

   7:  {

   8:      mIsTouch = true;//正在觸摸

   9:      mOffsetX = this.mScrollViewer.HorizontalOffset;//擷取ScrollViewer捲軸當前位置

  10:      mOffsetY = this.mScrollViewer.VerticalOffset;//擷取ScrollViewer捲軸當前位置

  11:      mPoint = e.GetTouchPoint(mScrollViewer);//擷取相對於ScrollViewer的觸摸點位置

  12:  }

  13:   

  14:  //觸摸移動事件

  15:  private void mScrollViewer_TouchMove(object sender, TouchEventArgs e)

  16:  {

  17:      if (mIsTouch == true)//如果正在觸摸

  18:      {

  19:          TouchPoint point = e.GetTouchPoint(mScrollViewer);//擷取相對於ScrollViewer的觸摸點位置

  20:          double DiffOffsetX = point.Position.X - mPoint.Position.X;//計算相對位置

  21:          double DiffOffsetY = point.Position.Y - mPoint.Position.Y;//計算相對位置

  22:          this.mScrollViewer.ScrollToHorizontalOffset(mOffsetX - DiffOffsetX);//ScrollViewer滾動到指定位置

  23:          this.mScrollViewer.ScrollToVerticalOffset(mOffsetY - DiffOffsetY);//ScrollViewer滾動到指定位置

  24:      }

  25:  }

  26:   

  27:  //觸摸結束事件

  28:  private void mScrollViewer_TouchUp(object sender, TouchEventArgs e)

  29:  {

  30:      mIsTouch = false;//觸摸結束

  31:  }