VB.Net Tutorial/2D Graphics/Region

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Create Region from Rectangle

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

  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 Rectangle(20, 20, 60, 80)
       Dim rect2 As New Rectangle(100, 100, 30, 40)
       Dim rgn1 As New [Region](rect2)
       g.ExcludeClip(rect1)
       g.ExcludeClip(rgn1)
       g.FillRectangle(Brushes.Red, 0, 0, 200, 200)
       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>

Region: Complement

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

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

End class

Public Class CombinationsForm

   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()
       "
       "CombinationsForm
       "
       Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
       Me.ClientSize = New System.Drawing.Size(200, 118)
       Me.Name = "CombinationsForm"
       Me.Text = "CombinationsForm"
   End Sub
  1. End Region
   Private Sub CombinationsForm_Paint(ByVal sender As Object, ByVal e As System.Windows.Forms.PaintEventArgs) Handles MyBase.Paint
       Dim g As Graphics = e.Graphics
       Dim width As Single = Me.ClientSize.Width 
       Dim height As Single = Me.ClientSize.Height
       Dim rect As RectangleF = New RectangleF(0, 0, width, height)
       Dim path1 As GraphicsPath = New GraphicsPath()
       Dim path2 As GraphicsPath = New GraphicsPath()
       Dim path1Rect As RectangleF = New RectangleF(0, 0, width * 2.0F / 3.0F, height)
       Dim path2rect As RectangleF = path1Rect
       path2rect.Offset(width * 1.0F / 3.0F, 0)
       path1.AddEllipse(path1Rect)
       path2.AddEllipse(path2rect)
       Dim region As Region = New Region(path1)
       region.ruplement(path2)
       g.FillRegion(Brushes.Red, region)
       g.TranslateTransform(width, 0)
   End Sub

End Class</source>

Region: Exclude

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

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

End class

Public Class CombinationsForm

   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()
       "
       "CombinationsForm
       "
       Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
       Me.ClientSize = New System.Drawing.Size(200, 118)
       Me.Name = "CombinationsForm"
       Me.Text = "CombinationsForm"
   End Sub
  1. End Region
   Private Sub CombinationsForm_Paint(ByVal sender As Object, ByVal e As System.Windows.Forms.PaintEventArgs) Handles MyBase.Paint
       Dim g As Graphics = e.Graphics
       Dim width As Single = Me.ClientSize.Width 
       Dim height As Single = Me.ClientSize.Height
       Dim rect As RectangleF = New RectangleF(0, 0, width, height)
       Dim path1 As GraphicsPath = New GraphicsPath()
       Dim path2 As GraphicsPath = New GraphicsPath()
       Dim path1Rect As RectangleF = New RectangleF(0, 0, width * 2.0F / 3.0F, height)
       Dim path2rect As RectangleF = path1Rect
       path2rect.Offset(width * 1.0F / 3.0F, 0)
       path1.AddEllipse(path1Rect)
       path2.AddEllipse(path2rect)
       Dim region As Region = New Region(path1)
       region.Exclude(path2)
       g.FillRegion(Brushes.Red, region)
       g.TranslateTransform(width, 0)
   End Sub

End Class</source>

Region: Intersect

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

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

End class

Public Class CombinationsForm

   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()
       "
       "CombinationsForm
       "
       Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
       Me.ClientSize = New System.Drawing.Size(200, 118)
       Me.Name = "CombinationsForm"
       Me.Text = "CombinationsForm"
   End Sub
  1. End Region
   Private Sub CombinationsForm_Paint(ByVal sender As Object, ByVal e As System.Windows.Forms.PaintEventArgs) Handles MyBase.Paint
       Dim g As Graphics = e.Graphics
       Dim width As Single = Me.ClientSize.Width 
       Dim height As Single = Me.ClientSize.Height
       Dim rect As RectangleF = New RectangleF(0, 0, width, height)
       Dim path1 As GraphicsPath = New GraphicsPath()
       Dim path2 As GraphicsPath = New GraphicsPath()
       Dim path1Rect As RectangleF = New RectangleF(0, 0, width * 2.0F / 3.0F, height)
       Dim path2rect As RectangleF = path1Rect
       path2rect.Offset(width * 1.0F / 3.0F, 0)
       path1.AddEllipse(path1Rect)
       path2.AddEllipse(path2rect)
       Dim region As Region = New Region(path1)
       region.Intersect(path2)
       g.FillRegion(Brushes.Red, region)
       g.TranslateTransform(width, 0)
   End Sub

End Class</source>

Region.MakeEmpty, Region.MakeInfinite, Region.GetBounds

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

  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 Rectangle(20, 20, 60, 80)
       Dim rect2 As New Rectangle(50, 30, 60, 80)
       Dim rgn1 As New [Region](rect1)
       Dim rgn2 As New [Region](rect2)
       If Not rgn1.IsEmpty(g) Then
           rgn1.MakeEmpty()
       End If 
       If Not rgn2.IsInfinite(g) Then
           rgn2.MakeInfinite()
       End If " Get bounds of the infinite region
       Dim rect As RectangleF = rgn2.GetBounds(g)
       Console.WriteLine(rect.ToString())
       g.FillRegion(Brushes.Red, rgn2)
       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>

Region: Union

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

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

End class

Public Class CombinationsForm

   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()
       "
       "CombinationsForm
       "
       Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
       Me.ClientSize = New System.Drawing.Size(200, 118)
       Me.Name = "CombinationsForm"
       Me.Text = "CombinationsForm"
   End Sub
  1. End Region
   Private Sub CombinationsForm_Paint(ByVal sender As Object, ByVal e As System.Windows.Forms.PaintEventArgs) Handles MyBase.Paint
       Dim g As Graphics = e.Graphics
       Dim width As Single = Me.ClientSize.Width 
       Dim height As Single = Me.ClientSize.Height
       Dim rect As RectangleF = New RectangleF(0, 0, width, height)
       Dim path1 As GraphicsPath = New GraphicsPath()
       Dim path2 As GraphicsPath = New GraphicsPath()
       Dim path1Rect As RectangleF = New RectangleF(0, 0, width * 2.0F / 3.0F, height)
       Dim path2rect As RectangleF = path1Rect
       path2rect.Offset(width * 1.0F / 3.0F, 0)
       path1.AddEllipse(path1Rect)
       path2.AddEllipse(path2rect)
       Dim region As Region = New Region(path1)
       region.Union(path2)
       g.FillRegion(Brushes.Red, region)
       g.TranslateTransform(width, 0)
   End Sub

End Class</source>

Region: Xor

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

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

End class

Public Class CombinationsForm

   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()
       "
       "CombinationsForm
       "
       Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
       Me.ClientSize = New System.Drawing.Size(200, 118)
       Me.Name = "CombinationsForm"
       Me.Text = "CombinationsForm"
   End Sub
  1. End Region
   Private Sub CombinationsForm_Paint(ByVal sender As Object, ByVal e As System.Windows.Forms.PaintEventArgs) Handles MyBase.Paint
       Dim g As Graphics = e.Graphics
       Dim width As Single = Me.ClientSize.Width 
       Dim height As Single = Me.ClientSize.Height
       Dim rect As RectangleF = New RectangleF(0, 0, width, height)
       Dim path1 As GraphicsPath = New GraphicsPath()
       Dim path2 As GraphicsPath = New GraphicsPath()
       Dim path1Rect As RectangleF = New RectangleF(0, 0, width * 2.0F / 3.0F, height)
       Dim path2rect As RectangleF = path1Rect
       path2rect.Offset(width * 1.0F / 3.0F, 0)
       path1.AddEllipse(path1Rect)
       path2.AddEllipse(path2rect)
       Dim region As Region = New Region(path1)
       region.Xor(path2)
       g.FillRegion(Brushes.Red, region)
       g.TranslateTransform(width, 0)
   End Sub

End Class</source>