Round the corners on a form or control

[George B Gilbert]

Public Class C_RoundCorners

    Public Sub RoundCornersForm(Form As Form,
                                Optional Radius As Integer = 20)
        '---------------------------------------------------------------------------------
        ' Round the corners on a form
        '---------------------------------------------------------------------------------

        Form.FormBorderStyle = FormBorderStyle.None
        Dim DGP As New Drawing2D.GraphicsPath
        DGP.StartFigure()

        '** Top left corner
        DGP.AddArc(New Rectangle(0, 0, Radius, Radius), 180, 90)
        DGP.AddLine(Radius, 0, Form.Width - Radius, 0)

        '** Top right corner
        DGP.AddArc(New Rectangle(Form.Width - Radius, 0, Radius, Radius), -90, 90)
        DGP.AddLine(Form.Width, Radius, Form.Width, Form.Height - Radius)

        '** Bottom right corner
        DGP.AddArc(New Rectangle(Form.Width - Radius, Form.Height - Radius, Radius, Radius), 0, 90)
        DGP.AddLine(Form.Width - Radius, Form.Height, Radius, Form.Height)

        '** Bottom left corner
        DGP.AddArc(New Rectangle(0, Form.Height - Radius, Radius, Radius), 90, 90)
        DGP.CloseFigure()

        Form.Region = New Region(DGP)

    End Sub
    Public Sub RoundCornersControl(Control As Control,
                                   Optional Radius As Integer = 5)
        '---------------------------------------------------------------------------------
        ' Round the corners on a control
        '---------------------------------------------------------------------------------

        Dim DGP As New Drawing2D.GraphicsPath
        DGP.StartFigure()

        '** Top left corner
        DGP.AddArc(New Rectangle(0, 0, Radius, Radius), 180, 90)
        DGP.AddLine(Radius, 0, Control.Width - Radius, 0)

        '** Top right corner
        DGP.AddArc(New Rectangle(Control.Width - Radius, 0, Radius, Radius), -90, 90)
        DGP.AddLine(Control.Width, Radius, Control.Width, Control.Height - Radius)

        '** Bottom right corner
        Dim brRadius As Integer = Radius + 5
        DGP.AddArc(New Rectangle(Control.Width - brRadius, Control.Height - brRadius, brRadius, brRadius), 0, 90)
        DGP.AddLine(Control.Width - brRadius, Control.Height, brRadius, Control.Height)

        '** Bottom left corner
        Dim blRadius As Integer = Radius + 3
        DGP.AddArc(New Rectangle(0, Control.Height - blRadius, blRadius, blRadius), 90, 90)
        DGP.CloseFigure()

        Control.Region = New Region(DGP)

    End Sub
End Class