.net – Visual Basic循环进度条

您可以稍后将其转换为您自己的用户控件,但这将帮助您入门.它应该是相当自我解释的：

Private Sub Form2_Paint(sender As Object,e As PaintEventArgs) Handles Me.Paint
    DrawProgress(e.Graphics,New Rectangle(5,5,60,60),40)
    DrawProgress(e.Graphics,New Rectangle(80,80)
    DrawProgress(e.Graphics,New Rectangle(155,57)
End Sub

Private Sub DrawProgress(g As Graphics,rect As Rectangle,percentage As Single)
    'work out the angles for each arc
    Dim progressAngle = CSng(360 / 100 * percentage)
    Dim remainderAngle = 360 - progressAngle

    'create pens to use for the arcs
    Using progressPen As New Pen(Color.LightSeaGreen,2),remainderPen As New Pen(Color.LightGray,2)
        'set the smoothing to high quality for better output
        g.SmoothingMode = Drawing2D.SmoothingMode.AntiAlias
        'draw the blue and white arcs
        g.DrawArc(progressPen,rect,-90,progressAngle)
        g.DrawArc(remainderPen,progressAngle - 90,remainderAngle)
    End Using

    'draw the text in the centre by working out how big it is and adjusting the co-ordinates accordingly
    Using fnt As New Font(Me.Font.FontFamily,14)
        Dim text As String = percentage.ToString + "%"
        Dim textSize = g.MeasureString(text,fnt)
        Dim textPoint As New Point(CInt(rect.Left + (rect.Width / 2) - (textSize.Width / 2)),CInt(rect.Top + (rect.Height / 2) - (textSize.Height / 2)))
        'now we have all the values draw the text
        g.DrawString(text,fnt,Brushes.Black,textPoint)
    End Using
End Sub

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