VB.Net Tutorial/2D Graphics/Ellipse

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Graphics.DrawEllipse

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

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

End class Public Class FrmComboBox

  Inherits 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
  " contains shape list (circle, square, ellipse, pie) 
  Friend WithEvents cboImage As System.Windows.Forms.ruboBox
  "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.cboImage = New System.Windows.Forms.ruboBox()
     Me.SuspendLayout()
     "
     "cboImage
     "
     Me.cboImage.DropDownWidth = 121
     Me.cboImage.Items.AddRange(New Object() {"Circle", "Square", "Ellipse", "Pie", "Filled Circle", "Filled Square", "Filled Ellipse", "Filled Pie"})
     Me.cboImage.Location = New System.Drawing.Point(24, 16)
     Me.cboImage.Name = "cboImage"
     Me.cboImage.Size = New System.Drawing.Size(121, 21)
     Me.cboImage.TabIndex = 0
     "
     "FrmComboBox
     "
     Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
     Me.ClientSize = New System.Drawing.Size(292, 273)
     Me.Controls.AddRange(New System.Windows.Forms.Control() {Me.cboImage})
     Me.Name = "FrmComboBox"
     Me.Text = "ComboBoxTest"
     Me.ResumeLayout(False)
  End Sub
  1. End Region
  Private Sub cboImage_SelectedIndexChanged _
     (ByVal sender As System.Object, _
     ByVal e As System.EventArgs) _
     Handles cboImage.SelectedIndexChanged
     Dim myGraphics As Graphics = MyBase.CreateGraphics()
     Dim myPen As New Pen(Color.DarkRed)
     Dim mySolidBrush As New SolidBrush(Color.DarkRed)
     myGraphics.Clear(Color.White)
     Select Case cboImage.SelectedIndex
        Case 0 " case circle is selected
           myGraphics.DrawEllipse(myPen, 50, 50, 150, 150)
        Case 1 
           myGraphics.DrawRectangle(myPen, 50, 50, 150, 150)
        Case 2 
           myGraphics.DrawEllipse(myPen, 50, 85, 150, 115)
        Case 3 
           myGraphics.DrawPie(myPen, 50, 50, 150, 150, 0, 45)
        Case 4 
           myGraphics.FillEllipse(mySolidBrush, 50, 50, 150, 150)
        Case 5 
           myGraphics.FillRectangle(mySolidBrush, 50, 50, 150, 150)
        Case 6 
           myGraphics.FillEllipse(mySolidBrush, 50, 85, 150, 115)
        Case 7 
           myGraphics.FillPie(mySolidBrush, 50, 50, 150, 150, 0, 45)
     End Select
  End Sub

End Class</source>