Материал из VB Эксперт
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Draw Ploygon

Imports System
Imports System.Drawing
Imports System.Collections
Imports System.Windows.Forms
Imports System.Drawing.Text
Public Class MainClass
   Shared Sub Main()
        Dim myform As Form = New FrmPolygon()
   End Sub " Main
End Class

Public Class FrmPolygon
   Inherits System.Windows.Forms.Form
   " polygon type options
   Friend WithEvents filledPolygonRadio As RadioButton
   Friend WithEvents lineRadio As RadioButton
   Friend WithEvents polygonRadio As RadioButton
   " command buttons
   Friend WithEvents cmdClear As Button
   Friend WithEvents cmdNewColor As Button
   Friend WithEvents drawWindow As Panel
   Friend WithEvents typeGroup As GroupBox

#Region " Windows Form Designer generated code "
   Public Sub New()
      "This call is required by the Windows Form Designer.
      "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
         End If
      End If
   End Sub
   "Required by the Windows Form Designer
   Private components As System.ruponentModel.Container
   "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.typeGroup = New System.Windows.Forms.GroupBox()
      Me.filledPolygonRadio = New System.Windows.Forms.RadioButton()
      Me.lineRadio = New System.Windows.Forms.RadioButton()
      Me.polygonRadio = New System.Windows.Forms.RadioButton()
      Me.drawWindow = New System.Windows.Forms.Panel()
      Me.cmdClear = New System.Windows.Forms.Button()
      Me.cmdNewColor = New System.Windows.Forms.Button()
      Me.typeGroup.Controls.AddRange(New System.Windows.Forms.Control() {Me.filledPolygonRadio, Me.lineRadio, Me.polygonRadio})
      Me.typeGroup.Location = New System.Drawing.Point(232, 8)
      Me.typeGroup.Name = "typeGroup"
      Me.typeGroup.Size = New System.Drawing.Size(128, 104)
      Me.typeGroup.TabIndex = 0
      Me.typeGroup.TabStop = False
      Me.typeGroup.Text = "Select Type"
      Me.filledPolygonRadio.Location = New System.Drawing.Point(8, 80)
      Me.filledPolygonRadio.Name = "filledPolygonRadio"
      Me.filledPolygonRadio.Size = New System.Drawing.Size(112, 16)
      Me.filledPolygonRadio.TabIndex = 2
      Me.filledPolygonRadio.Text = "Filled Polygon"
      Me.lineRadio.Location = New System.Drawing.Point(8, 24)
      Me.lineRadio.Name = "lineRadio"
      Me.lineRadio.Size = New System.Drawing.Size(112, 16)
      Me.lineRadio.TabIndex = 1
      Me.lineRadio.Text = "Lines"
      Me.polygonRadio.Location = New System.Drawing.Point(8, 48)
      Me.polygonRadio.Name = "polygonRadio"
      Me.polygonRadio.Size = New System.Drawing.Size(112, 24)
      Me.polygonRadio.TabIndex = 0
      Me.polygonRadio.Text = "Polygon"
      Me.drawWindow.BackColor = System.Drawing.SystemColors.Window
      Me.drawWindow.BorderStyle = System.Windows.Forms.BorderStyle.Fixed3D
      Me.drawWindow.Name = "drawWindow"
      Me.drawWindow.Size = New System.Drawing.Size(232, 264)
      Me.drawWindow.TabIndex = 1
      Me.cmdClear.Location = New System.Drawing.Point(240, 160)
      Me.cmdClear.Name = "cmdClear"
      Me.cmdClear.Size = New System.Drawing.Size(112, 24)
      Me.cmdClear.TabIndex = 2
      Me.cmdClear.Text = "Clear"
      Me.cmdNewColor.Location = New System.Drawing.Point(240, 192)
      Me.cmdNewColor.Name = "cmdNewColor"
      Me.cmdNewColor.Size = New System.Drawing.Size(112, 24)
      Me.cmdNewColor.TabIndex = 3
      Me.cmdNewColor.Text = "Change Color"
      Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
      Me.ClientSize = New System.Drawing.Size(360, 269)
      Me.Controls.AddRange(New System.Windows.Forms.Control() {Me.cmdNewColor, Me.cmdClear, Me.drawWindow, Me.typeGroup})
      Me.Name = "FrmPolygon"
      Me.Text = "Drawing Polygons"
   End Sub
#End Region
   Private mPoints As ArrayList = New ArrayList()
   Dim mPen As Pen = New Pen(Color.DarkBlue)
   Dim mBrush As SolidBrush = New SolidBrush(Color.DarkBlue)
   Private Sub drawWindow_MouseDown(ByVal sender _
      As Object, ByVal e As _
      System.Windows.Forms.MouseEventArgs) _
      Handles drawWindow.MouseDown
      mPoints.Add(New Point(e.X, e.Y))
      drawWindow.Invalidate() " refresh panel
   End Sub 
   Private Sub drawWindow_Paint(ByVal sender As Object, _
      ByVal e As System.Windows.Forms.PaintEventArgs) _
      Handles drawWindow.Paint
      Dim graphicsObject As Graphics = e.Graphics
      If mPoints.Count > 1 Then
         Dim pointArray() As Point = _
         If polygonRadio.Checked Then 
            graphicsObject.DrawPolygon(mPen, pointArray)
         ElseIf lineRadio.Checked Then
            graphicsObject.DrawLines(mPen, pointArray)
         ElseIf filledPolygonRadio.Checked Then 
            graphicsObject.FillPolygon(mBrush, pointArray)
         End If
      End If
   End Sub 
   Private Sub cmdClear_Click(ByVal sender As System.Object, _
      ByVal e As System.EventArgs) Handles cmdClear.Click
      mPoints = New ArrayList()
   End Sub
   Private Sub polygonRadio_CheckedChanged(ByVal sender As _
      System.Object, ByVal e As System.EventArgs) _
      Handles polygonRadio.CheckedChanged
   End Sub
   Private Sub lineRadio_CheckedChanged(ByVal sender As _
      System.Object, ByVal e As System.EventArgs) _
      Handles lineRadio.CheckedChanged
   End Sub
   Private Sub filledPolygonRadio_CheckedChanged(ByVal sender _
      As System.Object, ByVal e As System.EventArgs) _
      Handles filledPolygonRadio.CheckedChanged
   End Sub 
   Private Sub cmdNewColor_Click(ByVal sender As _
      System.Object, ByVal e As System.EventArgs) _
      Handles cmdNewColor.Click
      Dim colorBox As ColorDialog = New ColorDialog()
      Dim result As DialogResult = colorBox.ShowDialog()
      If result = DialogResult.Cancel Then
      End If
      mPen.Color = colorBox.Color 
      mBrush.Color = colorBox.Color 
   End Sub 
End Class