Graphics.DrawEllipse : Ellipse « 2D Graphics « VB.Net Tutorial






  1. VB.Net Tutorial
  2. 2D Graphics
  3. Ellipse
Graphics.DrawEllipse
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

#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.ComboBox

   'Required by the Windows Form Designer
   Private components As System.ComponentModel.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.ComboBox()
      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

#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








17.5.Ellipse
17.5.1.Graphics.DrawEllipseGraphics.DrawEllipse