Region: Union : Region « 2D Graphics « VB.Net Tutorial

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VB.Net Tutorial » 2D Graphics » Region 
17.19.2.Region: Union
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 NothingThen
                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()
        '
        'CombinationsForm
        '
        Me.AutoScaleBaseSize = New System.Drawing.Size(513)
        Me.ClientSize = New System.Drawing.Size(200118)
        Me.Name = "CombinationsForm"
        Me.Text = "CombinationsForm"

    End Sub

#End Region

    Private Sub CombinationsForm_Paint(ByVal sender As Object, ByVal e As System.Windows.Forms.PaintEventArgsHandles MyBase.Paint
        Dim As Graphics = e.Graphics
        Dim width As Single = Me.ClientSize.Width 
        Dim height As Single = Me.ClientSize.Height
        Dim rect As RectangleF = New RectangleF(00, width, height)

        Dim path1 As GraphicsPath = New GraphicsPath()
        Dim path2 As GraphicsPath = New GraphicsPath()

        Dim path1Rect As RectangleF = New RectangleF(00, width * 2.0F 3.0F, height)
        Dim path2rect As RectangleF = path1Rect
        path2rect.Offset(width * 1.0F 3.0F0)
        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
17.19.Region
17.19.1.Create Region from RectangleCreate Region from Rectangle
17.19.2.Region: UnionRegion: Union
17.19.3.Region: IntersectRegion: Intersect
17.19.4.Region: ExcludeRegion: Exclude
17.19.5.Region: ComplementRegion: Complement
17.19.6.Region: XorRegion: Xor
17.19.7.Region.MakeEmpty, Region.MakeInfinite, Region.GetBoundsRegion.MakeEmpty, Region.MakeInfinite, Region.GetBounds
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