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.net中PictureBox中图片的拖动
首先在Form窗体上放一个PictureBox,并指定一个图片显示
定义一系列变量处理图片拖动
 '处理图片拖动
     Private m_Leftx As Integer
     Private m_Lefty As Integer
     Dim m_MousePosX As Integer
     Dim m_MousePosY As Integer
     Dim m_DriftX As Integer
     Dim m_DriftY As Integer
并给赋初值,可以在Form初始化时做
    Me.m_Leftx = Me.PictureBox1.Location.X
     Me.m_Lefty = Me.PictureBox1.Location.Y
定义处理鼠标按下的事件
 '当鼠标按下时,将鼠标变成手形,并且记录下当前鼠标的位置
  Private Sub PictureBox1_MouseDown(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles PictureBox1.MouseDown
         Me.Cursor = System.Windows.Forms.Cursors.Hand
         m_MousePosX = e.X
         m_MousePosY = e.Y
     End Sub
定义处理鼠标抬起的事件
 '处理鼠标按键抬起的事件,根据鼠标按下时保存的鼠标位置,和当前鼠标的位置,计算鼠标移动偏移量,借此调用移动图片的函数,移动图片
     Private Sub PictureBox1_MouseUp(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles PictureBox1.MouseUp
       
         m_DriftX = m_MousePosX - e.X

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