VB.Net Tutorial/2D Graphics/Region

Create Region from Rectangle

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

Region: Complement

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
#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
#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

Region: Exclude

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
#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
#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

Region: Intersect

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
#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
#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

Region.MakeEmpty, Region.MakeInfinite, Region.GetBounds

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

Region: Union

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
#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
#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

Region: Xor

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
#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
#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