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  • VB.NET中用GDI+画饼图

    Public Class Form1
        Private Const Pi As Single = 3.1415926

        Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnDrawing.Click
            'Debug.Print("tttt")

        End Sub

        Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
            With PicShow
                '.Top = 10
                '.Left = 10
                '.Width = 300
                '.Height = 300
                .Dock = DockStyle.Fill
            End With
            Me.Controls.Add(PicShow)
        End Sub

        Private Sub Mypaint(ByVal e As PaintEventArgs)

            Dim MyCircle As Graphics = e.Graphics
            Dim Myline As Graphics = e.Graphics
            Dim MyPen As New Pen(Color.Black)
            Dim myRect As New Rectangle(50, 50, 200, 200)
            'MyCircle.DrawEllipse(MyPen, myRect)  '边框,被覆盖
            Myline.DrawLine(MyPen, 50, 150, 150, 150)

            '划分区间
            Dim sRectPer(2) As Single, x1(2) As Single, y1(2) As Single '定义的数组数为区间数-1
            sRectPer(0) = Radian("30", "30", "30", "40")
            x1(0) = 150 - Math.Cos(sRectPer(0)) * 100 '半径为100
            y1(0) = 150 - Math.Sin(sRectPer(0)) * 100
            Myline.DrawLine(MyPen, x1(0), y1(0), 150, 150)

            sRectPer(1) = Radian("60", "30", "30", "40") 'srectPer(n)的radian函数的第一个参数为前n+1个参数的和
            x1(1) = 150 - Math.Cos(sRectPer(1)) * 100
            y1(1) = 150 - Math.Sin(sRectPer(1)) * 100
            Myline.DrawLine(MyPen, x1(1), y1(1), 150, 150)

            '填充区间
            Dim x2(3) As Single, y2(3) As Single   '数组大小等于区间数
            For i As Double = 0 To sRectPer(0) Step 0.0001
                x2(0) = 150 - Math.Cos(i) * 100
                y2(0) = 150 - Math.Sin(i) * 100
                Myline.DrawLine(Pens.Magenta, x2(0), y2(0), 150, 150)
            Next

            For j As Double = sRectPer(0) To sRectPer(1) Step 0.0001
                x2(1) = 150 - Math.Cos(j) * 100
                y2(1) = 150 - Math.Sin(j) * 100
                Myline.DrawLine(Pens.SeaGreen, x2(1), y2(1), 150, 150)
            Next
            Dim newline As Graphics = e.Graphics
            For k As Double = sRectPer(1) To Pi * 2 Step 0.0001
                x2(2) = 150 - Math.Cos(k) * 100
                y2(2) = 150 - Math.Sin(k) * 100
                newline.DrawLine(Pens.Orange, x2(2), y2(2), 150, 150)
            Next
            'Dim a As Single = percentage("30", "30", "30", "40")
            'Debug.Print(a.ToString)

            '标示区间
            With lblrectA
                .Top = (150 + y1(0)) * 0.5
                .Left = (50 + x1(0)) * 0.3
                .Text = "组分A比例:" & percentage("30", "30", "30", "40")
                .BackColor = Color.Magenta
                .ForeColor = Color.White
            End With
            With lblrectB
                .Top = (y1(0) + y1(1)) * 0.5
                .Left = (x1(0) + x1(1)) * 0.4
                .Text = "组分B比例:" & percentage("30", "30", "30", "40")
                .BackColor = Color.SeaGreen
                .ForeColor = Color.White
            End With
            With lblrectC
                .Top = (150 + y1(1)) * 0.5
                .Left = (50 + x1(1)) * 0.3
                .Text = "组分C比例:" & percentage("40", "30", "30", "40")
                .BackColor = Color.Orange
                .ForeColor = Color.White
            End With

            MyPen.Dispose()
        End Sub


        Private Sub PicShow_Paint(ByVal sender As System.Object, ByVal e As System.Windows.Forms.PaintEventArgs) Handles PicShow.Paint
            Mypaint(e)
        End Sub

        Private Function percentage(ByVal rect As Integer, ByVal ParamArray rectall() As Integer) As Single
            Dim sum As Int64
            For i As Integer = 0 To UBound(rectall, 1)
                sum += rectall(i)
            Next
            percentage = rect / sum
        End Function

        Private Function Radian(ByVal rect As Integer, ByVal ParamArray rectall() As Integer) As Double
            radian = percentage(rect, rectall) * Pi * 2
        End Function

    End Class

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  • 原文地址:https://www.cnblogs.com/djcsch2001/p/2010365.html
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