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   源码介绍

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Public Class 仪表盘
    Private _Bg As Bitmap
    Private _Max As Integer = 100
    Private _Value As Integer = 25
    Private _Rote As Single
    Private _Digit As Bitmap
    Public Property MaxValue As Integer
        Get
            Return _Max
        End Get
        Set(value As Integer)
            If value < _Value Then value = _Value
            _Max = value
            _Rote = 360 / _Max * _Value
            MakeBg()
        End Set
    End Property
    Public Property Value As Integer
        Get
            Return _Value
        End Get
        Set(value As Integer)
            If value > _Max Then value = _Max
            _Value = value
            _Rote = 360 / _Max * _Value
            MakeBg()
        End Set
    End Property
    Private Sub 仪表盘_Load(sender As Object, e As EventArgs) Handles MyBase.Load
        MakeBg()
    End Sub
    Private Sub MakeBg()
        If _Bg IsNot Nothing Then _Bg.Dispose()
        _Bg = New Bitmap(344, 344)
        Using G As Graphics = Graphics.FromImage(_Bg)
            G.SmoothingMode = Drawing2D.SmoothingMode.HighQuality
            G.DrawImage(My.Resources.表盘底, New Rectangle(0, 0, 344, 344), New Rectangle(0, 0, 344, 344), GraphicsUnit.Pixel)
            Try
                Dim Gs As Drawing2D.GraphicsState = G.Save
                Using Gp As New Drawing2D.GraphicsPath
                    Gp.AddPie(New Rectangle(0, 0, 344, 344), -90, _Rote)
                    Using Txbur As New TextureBrush(My.Resources.表盘底1)
                        G.FillPath(Txbur, Gp)
                    End Using
                End Using
                G.TranslateTransform(172, 172)
                G.RotateTransform(_Rote)
                G.DrawImage(My.Resources.表盘底指针, New Rectangle(-172, -172, 344, 344), New Rectangle(0, 0, 344, 344), GraphicsUnit.Pixel)
                G.Restore(Gs)
                G.DrawImage(My.Resources.表盘液晶数字底, New Rectangle(0, 0, 344, 344), New Rectangle(0, 0, 344, 344), GraphicsUnit.Pixel)
                MakeDigit()
                Dim XX, YY As Single
                XX = (344 - _Digit.Width) / 2
                YY = (344 - _Digit.Height) / 2
                G.DrawImage(_Digit, New Rectangle(XX, YY, _Digit.Width, _Digit.Height), New Rectangle(0, 0, _Digit.Width, _Digit.Height), GraphicsUnit.Pixel)
            Catch
            End Try
        End Using
        Me.BackgroundImage = _Bg
        Me.Invalidate()
    End Sub
    Private Sub MakeDigit()
        If _Digit IsNot Nothing Then _Digit.Dispose()
        Dim V As Integer = _Value / _Max * 100
        Dim S As String = Format(V, "000")
        Dim W, H As Integer
        W = 30 * S.Length
        H = 30
        _Digit = New Bitmap(W, H)
        Using G As Graphics = Graphics.FromImage(_Digit)
            For I As Integer = 0 To S.Length - 1
                G.DrawImage(My.Resources.液晶数字, New Rectangle(I * 30, 0, 30, 30), New Rectangle(30 * S.Substring(I, 1), 0, 30, 30), GraphicsUnit.Pixel)
            Next
        End Using
    End Sub
End Class