已知ABC三点坐标,得到A点到BC的最近距离。 VB.net源代码 VS2012开发环境 Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click Dim A_x As Double = Me.TextBox_AX.Text Dim A_y As Double = Me.TextBox_AY.Text Dim B_x As Double = Me.TextBox_BX.Text Dim B_