Private Sub SetClipRegionCombine(ByVal e As PaintEventArgs)

    ' Create region for clipping.
    Dim clipRegion As New [Region](New Rectangle(0, 0, 100, 100))

    ' Set clipping region of graphics to region.
    e.Graphics.SetClip(clipRegion, CombineMode.Replace)

    ' Fill rectangle to demonstrate clip region.
    e.Graphics.FillRectangle(New SolidBrush(Color.Black), 0, 0, _
    500, 300)
End Sub

Private Sub SetClipRectangleFCombine(ByVal e As PaintEventArgs)

    ' Create rectangle for clipping region.
    Dim clipRect As New RectangleF(0.0F, 0.0F, 100.0F, 100.0F)

    ' Set clipping region of graphics to rectangle.
    e.Graphics.SetClip(clipRect, CombineMode.Replace)

    ' Fill rectangle to demonstrate clip region.
    e.Graphics.FillRectangle(New SolidBrush(Color.Black), 0, 0, _
    500, 300)
End Sub

Private Sub SetClipRectangleCombine(ByVal e As PaintEventArgs)

    ' Create rectangle for clipping region.
    Dim clipRect As New Rectangle(0, 0, 100, 100)

    ' Set clipping region of graphics to rectangle.
    e.Graphics.SetClip(clipRect, CombineMode.Replace)

    ' Fill rectangle to demonstrate clip region.
    e.Graphics.FillRectangle(New SolidBrush(Color.Black), 0, 0, _
    500, 300)
End Sub

Private Sub SetClipPathCombine(ByVal e As PaintEventArgs)

    ' Create graphics path.
    Dim clipPath As New GraphicsPath
    clipPath.AddEllipse(0, 0, 200, 100)

    ' Set clipping region to path.
    e.Graphics.SetClip(clipPath, CombineMode.Replace)

    ' Fill rectangle to demonstrate clipping region.
    e.Graphics.FillRectangle(New SolidBrush(Color.Black), 0, 0, _
    500, 300)
End Sub

Private Sub SetClipGraphicsCombine(ByVal e As PaintEventArgs)

    ' Create temporary graphics object and set its clipping region.
    Dim newGraphics As Graphics = Me.CreateGraphics()
    newGraphics.SetClip(New Rectangle(0, 0, 100, 100))

    ' Update clipping region of graphics to clipping region of new

    ' graphics.
    e.Graphics.SetClip(newGraphics, CombineMode.Replace)

    ' Fill rectangle to demonstrate clip region.
    e.Graphics.FillRectangle(New SolidBrush(Color.Black), 0, 0, _
    500, 300)

    ' Release new graphics.
    newGraphics.Dispose()
End Sub

Private Sub SetClipRectangle(ByVal e As PaintEventArgs)

    ' Create rectangle for clipping region.
    Dim clipRect As New Rectangle(0, 0, 100, 100)

    ' Set clipping region of graphics to rectangle.
    e.Graphics.SetClip(clipRect)

    ' Fill rectangle to demonstrate clip region.
    e.Graphics.FillRectangle(New SolidBrush(Color.Black), 0, 0, _
    500, 300)
End Sub

Private Sub SetClipGraphics(ByVal e As PaintEventArgs)

    ' Create temporary graphics object and set its clipping region.
    Dim newGraphics As Graphics = Me.CreateGraphics()
    newGraphics.SetClip(New Rectangle(0, 0, 100, 100))

    ' Update clipping region of graphics to clipping region of new

    ' graphics.
    e.Graphics.SetClip(newGraphics)

    ' Fill rectangle to demonstrate clip region.
    e.Graphics.FillRectangle(New SolidBrush(Color.Black), 0, 0, _
    500, 300)

    ' Release new graphics.
    newGraphics.Dispose()
End Sub

Private Sub SetClipPath(ByVal e As PaintEventArgs)

    ' Create graphics path.
    Dim clipPath As New GraphicsPath
    clipPath.AddEllipse(0, 0, 200, 100)

    ' Set clipping region to path.
    e.Graphics.SetClip(clipPath)

    ' Fill rectangle to demonstrate clipping region.
    e.Graphics.FillRectangle(New SolidBrush(Color.Black), 0, 0, _
    500, 300)
End Sub

Private Sub SetClipRectangleF(ByVal e As PaintEventArgs)

    ' Create rectangle for clipping region.
    Dim clipRect As New RectangleF(0.0F, 0.0F, 100.0F, 100.0F)

    ' Set clipping region of graphics to rectangle.
    e.Graphics.SetClip(clipRect)

    ' Fill rectangle to demonstrate clip region.
    e.Graphics.FillRectangle(New SolidBrush(Color.Black), 0, 0, _
    500, 300)
End Sub

' 导入命名空间
Imports System
Imports System.Windows.Forms
Imports System.Drawing
Imports System.Drawing.Drawing2D


Public Class MainClass

  Shared Sub Main()
     Dim form1 As Form1 = new Form1
     Application.Run(form1)
  End Sub
  
End Class

Public Class Form1
  Inherits System.Windows.Forms.Form

#Region " Windows Form Designer generated code "

  Public Sub New()
    MyBase.New()

    'This call is required by the Windows Form Designer.
    InitializeComponent()

    'Add any initialization after the InitializeComponent() call

  End Sub

  'Form overrides dispose to clean up the component list.
  Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
    If disposing Then
      If Not (components Is Nothing) Then
        components.Dispose()
      End If
    End If
    MyBase.Dispose(disposing)
  End Sub

  'Required by the Windows Form Designer
  Private components As System.ComponentModel.IContainer

  'NOTE: The following procedure is required by the Windows Form Designer
  'It can be modified using the Windows Form Designer.  
  'Do not modify it using the code editor.
  <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
    Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
    Me.ClientSize = New System.Drawing.Size(352, 273)
    Me.Name = "Form1"
    Me.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen
    Me.Text = "Form1"
    Me.ResumeLayout(False)

  End Sub

#End Region

   Protected Overrides Sub OnPaint(ByVal e As PaintEventArgs)
    Dim G As Graphics = Me.CreateGraphics
    Dim R As New Rectangle(40.0F, 20.0F, 100.0F, 100.0F)
    Dim R2 As New Rectangle(60.0F, 20.0F, 120.0F, 120.0F)
    Dim P1 As New GraphicsPath()
    Dim P2 As New GraphicsPath()

    G.Clear(Color.Gainsboro)
    P1.AddEllipse(R)
    G.DrawPath(Pens.Black, P1)

    P2.AddEllipse(R2)
    G.DrawPath(Pens.Black, P2)

    G.SetClip(P1)
    G.SetClip(P2, CombineMode.Intersect)

    ' Draw some clipped strings.
    Dim F As New Font("Arial", 16)
    G.DrawString("www.java2s.com", F, Brushes.DeepPink, 15, 25)
  End Sub
End Class