Imports System
Imports System.ComponentModel
Imports System.Windows.Forms
Imports System.Data
Imports System.Configuration
Imports System.Drawing
Imports System.Drawing.Drawing2D
Imports System.Drawing.Text
Imports System.Globalization
Imports System.Text
Imports System.Collections
Public Class MainClass
Shared Sub Main()
Dim myform As Form = New CombinationsForm()
Application.Run(myform)
End Sub
End Class
Public Class CombinationsForm
Inherits System.Windows.Forms.Form
Public Sub New()
MyBase.New()
Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
Me.ClientSize = New System.Drawing.Size(244, 118)
Me.Text = "CombinationsForm"
End Sub
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 format As StringFormat = New StringFormat()
format.Alignment = StringAlignment.Center
format.LineAlignment = StringAlignment.Center
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.Complement(path2)
g.FillRegion(Brushes.Red, region)
g.DrawString("Complement", Me.Font, Brushes.Black, rect, format)
g.DrawRectangle(Pens.Black, rect.X, rect.Y, rect.Width, rect.Height)
g.TranslateTransform(width, 0)
End Sub
End Class