• λ我爱Aspx >> VB.Net >> 使用GDI+画2D饼状图(VB.Net)

    • 使用GDI+画2D饼状图(VB.Net)

  • :csdn blog  Դ:csdn blog  :2007-10-3 23:47:51  ؼ:.net,vb
  • 很久没写过本机windows App了,群内有人要实现花饼图的代码，而且不能用水晶报表，恰逢10.1，自己写了个实现。

    新建一个windows app工程，在窗体上填加一个picturebox(picshow)和三个label(lblrectA,B,C)
    在窗体代码页中他填加下面的代码：

    Public Class Form1

        '/*************************design by 撒卡*************************/
        '/功能:使用GDI花饼图demo
        '/时间:07.09.30
        '/****************************************************************/

        Private Const Pi As Single = 3.1415926

        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 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


    函数过程并没有进行优化，很多代码还是可以抽象出函数过程的，比如填充部分.如果你在自己项目中有应用，那你自己修改吧~当然也可以设计成一个class,时间原因，我没有那么做，你可以试下，很简单的东西，不多说了。帖个效果图
    Ҷƪл˵?
  • һƪ没有了!
    һƪvb.net把图象文件转换成XML文件