AE中，用ZedGraph控件画柱状图、饼状图

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        CreateGraph_GradientByZBars(XXXXXXXX) '折线图
    End Sub

    Private Sub CreateGraph_GradientByZBars(ByVal z1 As ZedGraphControl)
        Dim myPane As GraphPane = z1.GraphPane
        myPane.Title.Text = "Demonstration of Multi-Colored Bars with a Single BarItem"
        myPane.XAxis.Title.Text = "Bar Number"
        myPane.YAxis.Title.Text = "Value"

        Dim list As New PointPairList()
        Dim rand As New Random()

        Dim i As Integer
        For i = 0 To 15
            Dim x As Double = CDbl(i) + 1
            Dim y As Double = rand.NextDouble() * 1000
            Dim z As Double = i / 4.0
            list.Add(x, y, z)
        Next i

        Dim myCurve As BarItem = myPane.AddBar("Multi-Colored Bars", list, Color.Blue)
        Dim colors As Color() = {Color.Red, Color.Yellow, Color.Green, Color.Blue, Color.Purple}
        myCurve.Bar.Fill = New Fill(colors)
        myCurve.Bar.Fill.Type = FillType.GradientByZ

        myCurve.Bar.Fill.RangeMin = 0
        myCurve.Bar.Fill.RangeMax = 4

        myPane.Chart.Fill = New Fill(Color.White, Color.FromArgb(220, 220, 255), 45)
        myPane.Fill = New Fill(Color.White, Color.FromArgb(255, 255, 225), 45)
        ' Tell ZedGraph to calculate the axis ranges
        z1.AxisChange()
    End Sub 'CreateGraph_GradientByZBars