Question

基本上如果有人按button2，我希望程序重置测量。实际代码永远保持测量，我只想重置测量。抱歉我的英语不好，我希望你能理解我真正想要的东西，如果不是，我会详细解释。

这是我的代码：

Public Class Form1

    Private MonitorWidth As Double = 51.5 'cm 
    Private MonitorHeigth As Double = 31 'cm - This must be enter by the user
    Private TotalDistance As Double
    Private PixelHeigth As Double 'cm
    Private PixelWidth As Double 'cm
    Private WithEvents TTimer As New Timers.Timer
    Private PointQueue As New Queue(Of Point)(100)
    Private Lastpoint As Point

    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

    End Sub

    Private Sub Timer1_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Timer1.Tick

        TTimer.Stop()

        While PointQueue.Count > 0
            Dim P As Point = PointQueue.Dequeue
            TotalDistance += Math.Sqrt(((Lastpoint.X - P.X) * PixelWidth) ^ 2 + ((Lastpoint.Y - P.Y) * PixelHeigth) ^ 2)
            Lastpoint = P

            TextBox1.Text = Format(TotalDistance, "Distance: #,##0.0 cm")
            TTimer.Start()

        End While

    End Sub

    Private Sub TTimer_Elapsed(ByVal sender As Object, ByVal e As System.Timers.ElapsedEventArgs) Handles TTimer.Elapsed
        PointQueue.Enqueue(MousePosition)
    End Sub

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click

        If Button1.Enabled = True Then

            Lastpoint = MousePosition
            TTimer.AutoReset = True
            TTimer.Interval = 5
            TTimer.Start()
            Dim ScreenBounds As Rectangle = Screen.GetBounds(New Point(0, 0))
            Dim Screenwidth_Pixel As Integer = ScreenBounds.Width
            Dim screenHeigth_Pixel As Integer = ScreenBounds.Height
            PixelHeigth = MonitorHeigth / screenHeigth_Pixel
            PixelWidth = MonitorWidth / Screenwidth_Pixel
            Timer1.Interval = 200
            Timer1.Start()
        End If
    End Sub

    Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
        If Button2.Enabled = True Then

            Timer1.Stop()
            TextBox1.Text = ""
            TextBox1.Text = Format(TotalDistance = 0)
        End If
    End Sub
End Class

Answer 1

在Button2事件处理程序（Button2_Click）中，重置队列：

PointQueue = New Queue(Of Point)(100)

在Visual Basic中重置循环

1 个答案: