VB.Net Tutorial/2D Graphics/Clip

Clip by GraphicPath

<source lang="vbnet">Imports System.Drawing Imports System.Drawing.Drawing2D Imports System.Windows.Forms public class GraphicPathClip

  public Shared Sub Main
       Application.Run(New Form1)
  End Sub

End class public class Form1

 Inherits System.Windows.Forms.Form
 Protected Overrides Sub OnPaint(ByVal e As PaintEventArgs)
       Dim txt As String = "www.vbex.ru"
       Dim graphics_path As New GraphicsPath
       graphics_path.AddString(txt, _
           New FontFamily("Times New Roman"), _
           FontStyle.Bold, 150, _
           New Point(0, 0), _
           New StringFormat)
       e.Graphics.SetClip(graphics_path)
       e.Graphics.FillRectangle(Brushes.White, Me.ClientRectangle)
       Dim rnd As New Random
       Dim x1, y1, x2, y2 As Integer
       For i As Integer = 1 To 400
           x1 = rnd.Next(-20, Me.ClientSize.Width - 1)
           y1 = rnd.Next(0, Me.ClientSize.Height - 1)
           x2 = rnd.Next(500, Me.ClientSize.Width - 1)
           y2 = rnd.Next(0, Me.ClientSize.Height - 1)
           e.Graphics.DrawLine(Pens.Black, x1, y1, x2, y2)
       Next i
 End Sub
 Public Sub New()
   MyBase.New()
   Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
   Me.ClientSize = New System.Drawing.Size(292, 273)
   Me.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen
 End Sub

End Class</source>

Clip Region

<source lang="vbnet">Imports System.Drawing Imports System.Drawing.Drawing2D Imports System.Windows.Forms public class RegionClip

  public Shared Sub Main
       Application.Run(New Form1)
  End Sub

End class Public Class Form1

   Private Sub Form11_Paint(ByVal sender As Object, _
         ByVal e As System.Windows.Forms.PaintEventArgs) _
         Handles Me.Paint
       Dim canvas As Graphics
       Dim fencePath As GraphicsPath
       Dim slottedRegion As Region
       canvas = e.Graphics
       canvas.Clear(Color.White)
       fencePath = New GraphicsPath
       fencePath.AddRectangle(New Rectangle(2 * 10, 0, 20, 500))
       fencePath.AddRectangle(New Rectangle(8 * 10, 0, 20, 500))
       fencePath.AddRectangle(New Rectangle(14 * 10, 0, 20, 500))
       fencePath.AddRectangle(New Rectangle(20 * 10, 0, 20, 500))
       slottedRegion = New Region(fencePath)
       canvas.Clip = slottedRegion
       canvas.Clear(Color.Aqua)
       canvas.DrawString("www.vbex.ru", New Font("Times New Roman", 77),Brushes.Blue, 20, 20)
   End Sub

End Class

<Global.Microsoft.VisualBasic.rupilerServices.DesignerGenerated()> _ Partial Class Form1

   Inherits System.Windows.Forms.Form
   "Form overrides dispose to clean up the component list.
   <System.Diagnostics.DebuggerNonUserCode()> _
   Protected Overrides Sub Dispose(ByVal disposing As Boolean)
       If disposing AndAlso components IsNot Nothing Then
           components.Dispose()
       End If
       MyBase.Dispose(disposing)
   End Sub
   "Required by the Windows Form Designer
   Private components As System.ruponentModel.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.SuspendLayout()
       "
       "Form1
       "
       Me.AutoScaleDimensions = New System.Drawing.SizeF(6.0!, 13.0!)
       Me.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font
       Me.ClientSize = New System.Drawing.Size(617, 197)
       Me.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedSingle
       Me.MaximizeBox = False
       Me.Name = "Form1"
       Me.Text = "Using Regions Effectively"
       Me.ResumeLayout(False)
   End Sub

End Class</source>

Clip Region Exclude

<source lang="vbnet">Imports System.Drawing Imports System.Drawing.Drawing2D Imports System.Windows.Forms public class ClipRegionExclude

  public Shared Sub Main
       Application.Run(New Form1)
  End Sub

End class public class Form1

 Inherits System.Windows.Forms.Form
 Protected Overrides Sub OnPaint(ByVal e As PaintEventArgs)
       Dim g As Graphics = Me.CreateGraphics()
       g.Clear(Me.BackColor)
       Dim pen As New Pen(Color.Red, 5)
       Dim brush As New SolidBrush(Color.Red)
       Dim rect1 As New Rectangle(50, 0, 50, 150)
       Dim rect2 As New Rectangle(0, 50, 150, 50)
       Dim [region] As New [Region](rect1)
       [region].Exclude(rect2)
       g.FillRegion(brush, [region])
       g.Dispose()
 End Sub
 Public Sub New()
  
   MyBase.New()
   Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
   Me.ClientSize = New System.Drawing.Size(292, 273)
   Me.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen
 End Sub

End Class</source>

Clip Region Intersect

<source lang="vbnet">Imports System.Drawing Imports System.Drawing.Drawing2D Imports System.Windows.Forms public class ClipRegionIntersect

  public Shared Sub Main
       Application.Run(New Form1)
  End Sub

End class public class Form1

 Inherits System.Windows.Forms.Form
 Protected Overrides Sub OnPaint(ByVal e As PaintEventArgs)
       Dim g As Graphics = Me.CreateGraphics()
       g.Clear(Me.BackColor)
       Dim pen As New Pen(Color.Red, 5)
       Dim brush As New SolidBrush(Color.Red)
       Dim rect1 As New Rectangle(50, 0, 50, 150)
       Dim rect2 As New Rectangle(0, 50, 150, 50)
       Dim [region] As New [Region](rect1)
       [region].Intersect(rect2)
       g.FillRegion(brush, [region])
       g.Dispose()
 End Sub
 Public Sub New()
  
   MyBase.New()
   Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
   Me.ClientSize = New System.Drawing.Size(292, 273)
   Me.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen
 End Sub

End Class</source>

Clip Region Union

<source lang="vbnet">Imports System.Drawing Imports System.Drawing.Drawing2D Imports System.Windows.Forms public class ClipRegionUnion

  public Shared Sub Main
       Application.Run(New Form1)
  End Sub

End class public class Form1

 Inherits System.Windows.Forms.Form
 Protected Overrides Sub OnPaint(ByVal e As PaintEventArgs)
       Dim g As Graphics = Me.CreateGraphics()
       g.Clear(Me.BackColor)
       Dim pen As New Pen(Color.Red, 5)
       Dim brush As New SolidBrush(Color.Red)
       Dim rect1 As New Rectangle(50, 0, 50, 150)
       Dim rect2 As New Rectangle(0, 50, 150, 50)
       Dim [region] As New [Region](rect1)
       [region].Union(rect2)
       g.FillRegion(brush, [region])
       g.Dispose()
 End Sub
 Public Sub New()
  
   MyBase.New()
   Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
   Me.ClientSize = New System.Drawing.Size(292, 273)
   Me.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen
 End Sub

End Class</source>

Clip Region Xor

<source lang="vbnet">Imports System.Drawing Imports System.Drawing.Drawing2D Imports System.Windows.Forms public class ClipRegionXor

  public Shared Sub Main
       Application.Run(New Form1)
  End Sub

End class public class Form1

 Inherits System.Windows.Forms.Form
 Protected Overrides Sub OnPaint(ByVal e As PaintEventArgs)
       Dim g As Graphics = Me.CreateGraphics()
       g.Clear(Me.BackColor)
       Dim pen As New Pen(Color.Red, 5)
       Dim brush As New SolidBrush(Color.Red)
       Dim rect1 As New Rectangle(50, 0, 50, 150)
       Dim rect2 As New Rectangle(0, 50, 150, 50)
       Dim [region] As New [Region](rect1)
       [region].Xor(rect2)
       g.FillRegion(brush, [region])
       g.Dispose()
 End Sub
 Public Sub New()
  
   MyBase.New()
   Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
   Me.ClientSize = New System.Drawing.Size(292, 273)
   Me.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen
 End Sub

End Class</source>

CombineMode.Exclude

<source lang="vbnet">Imports System.Drawing Imports System.Drawing.Drawing2D Imports System.Windows.Forms public class CombineModeExclude

  public Shared Sub Main
       Application.Run(New Form1)
  End Sub

End class public class Form1

 Inherits System.Windows.Forms.Form
 Protected Overrides Sub OnPaint(ByVal e As PaintEventArgs)
       Dim g As Graphics = Me.CreateGraphics()
       g.Clear(Me.BackColor)
       Dim rect1 As New RectangleF(20.0F, 20.0F, 200.0F, 200.0F)
       Dim rgn1 As New [Region](rect1)
       g.SetClip(rgn1, CombineMode.Exclude)
       Dim h As Single = 20.0F
       Dim w As Single = 30.0F
       g.TranslateClip(h, w)
       g.FillRectangle(Brushes.Green, 20, 20, 300, 300)
 End Sub
 Public Sub New()
  
   MyBase.New()
   Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
   Me.ClientSize = New System.Drawing.Size(292, 273)
   Me.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen
 End Sub

End Class</source>

Rectangle clipped to Ellipse

<source lang="vbnet">Imports System.Drawing Imports System.Drawing.Drawing2D Imports System.Windows.Forms public class RectangleClippedEllipse

  public Shared Sub Main
       Application.Run(New ClippingRegionForm)
  End Sub

End class

Public Class ClippingRegionForm

   Inherits System.Windows.Forms.Form

1. 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.ruponentModel.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()
       components = New System.ruponentModel.Container()
       Me.Text = "ClippingRegionForm"
   End Sub

1. End Region

   Dim rnd As Random = New Random()

   Private Sub ClippingRegionForm_Paint(ByVal sender As Object, ByVal e As System.Windows.Forms.PaintEventArgs) Handles MyBase.Paint
       Dim g As Graphics = e.Graphics
       Dim path As GraphicsPath = New GraphicsPath()
       path.AddEllipse(Me.ClientRectangle)
       Dim region As Region = New Region(path)
       g.DrawPath(Pens.Red, path)
       g.Clip = region
       Dim rect As Rectangle = Me.ClientRectangle
       rect.Offset(10, 10)
       rect.Width = rect.Width - 20
       rect.Height = rect.Height - 20
       g.FillRectangle(Brushes.Black, rect)
   End Sub

End Class</source>