Displaying and resizing an image : Draw Image « 2D « VB.Net

1. VB.Net
2. 2D
3. Draw Image

Displaying and resizing an image

Imports System
Imports System.Drawing
Imports System.Drawing.Drawing2D
Imports System.Windows.Forms
Imports System.Drawing.Text

Public Class MainClass

   Shared Sub Main()
        Dim myform As Form = New FrmDisplayLogo()
        Application.Run(myform)
   End Sub ' Main

End Class




Public Class FrmDisplayLogo
   Inherits System.Windows.Forms.Form

   ' width controls
   Friend WithEvents txtWidth As TextBox
   Friend WithEvents lblWidth As Label

   ' height controls
   Friend WithEvents lblHeight As Label
   Friend WithEvents txtHeight As TextBox

   Private mGraphicsObject As Graphics
   Private mImage As Image

   ' sets member variables on form load
   Private Sub FrmDisplayLogo_Load(ByVal sender As _
      System.Object, ByVal e As System.EventArgs) _
      Handles MyBase.Load

      ' get Form's graphics object
      mGraphicsObject = Me.CreateGraphics

      ' load image
      mImage = Image.FromFile("figure2.bmp")

   End Sub ' FrmDisplayLogo_Load

#Region " Windows Form Designer generated code "

   Public Sub New()
      MyBase.New()

      ' This call is required by Windows Form Designer.
      InitializeComponent()

      ' Add any initialization after InitializeComponent() call
   End Sub ' new

   '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
   Friend WithEvents cmdSetButton As System.Windows.Forms.Button

   '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.lblWidth = New System.Windows.Forms.Label()
      Me.lblHeight = New System.Windows.Forms.Label()
      Me.txtWidth = New System.Windows.Forms.TextBox()
      Me.txtHeight = New System.Windows.Forms.TextBox()
      Me.cmdSetButton = New System.Windows.Forms.Button()
      Me.SuspendLayout()
      '
      'lblWidth
      '
      Me.lblWidth.Location = New System.Drawing.Point(440, 56)
      Me.lblWidth.Name = "lblWidth"
      Me.lblWidth.TabIndex = 0
      Me.lblWidth.Text = "Width"
      '
      'lblHeight
      '
      Me.lblHeight.Location = New System.Drawing.Point(440, 128)
      Me.lblHeight.Name = "lblHeight"
      Me.lblHeight.TabIndex = 2
      Me.lblHeight.Text = "Height"
      '
      'txtWidth
      '
      Me.txtWidth.Location = New System.Drawing.Point(440, 88)
      Me.txtWidth.Name = "txtWidth"
      Me.txtWidth.TabIndex = 1
      Me.txtWidth.Text = ""
      '
      'txtHeight
      '
      Me.txtHeight.Location = New System.Drawing.Point(440, 160)
      Me.txtHeight.Name = "txtHeight"
      Me.txtHeight.TabIndex = 3
      Me.txtHeight.Text = ""
      '
      'cmdSetButton
      '
      Me.cmdSetButton.Location = New System.Drawing.Point(456, 200)
      Me.cmdSetButton.Name = "cmdSetButton"
      Me.cmdSetButton.TabIndex = 4
      Me.cmdSetButton.Text = "Set"
      '
      'FrmDisplayLogo
      '
      Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
      Me.ClientSize = New System.Drawing.Size(568, 273)
      Me.Controls.AddRange(New System.Windows.Forms.Control() {Me.cmdSetButton, Me.txtHeight, Me.lblHeight, Me.txtWidth, Me.lblWidth})
      Me.Name = "FrmDisplayLogo"
      Me.Text = "Display Logo"
      Me.ResumeLayout(False)

   End Sub

#End Region

   Private Sub cmdSetButton_Click(ByVal sender As System.Object, _
      ByVal e As System.EventArgs) Handles cmdSetButton.Click


      Dim width As Integer = Convert.ToInt32(txtWidth.Text)
      Dim height As Integer = Convert.ToInt32(txtHeight.Text)


      If (width > 375 OrElse height > 225) Then
         MessageBox.Show("Height or Width too large")

         Return
      End If
      mGraphicsObject.Clear(Me.BackColor) 


      mGraphicsObject.DrawImage(mImage, 5, 5, width, height)
   End Sub 

End Class 
           
       

Related examples in the same category

1.	Process an Image: invert Pixel
2.	Draw Image on a Frame