Mega Code Archive
Zoom and Skew an Image
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Imports System.Drawing
Imports System.Drawing.Drawing2D
Imports System.Windows.Forms
public class ZoomImageAndSkew
public Shared Sub Main
Application.Run(New Form1)
End Sub
End class
Public Class Form1
Inherits System.Windows.Forms.Form
Private curImage As Image
Private imgHeight As Single
Private imgWidth As Single
Private menuItem12 As System.Windows.Forms.MenuItem
Private curFileName As String
#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
'Required by the Windows Form Designer
Private components As System.ComponentModel.IContainer
'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.
Friend WithEvents MainMenu1 As System.Windows.Forms.MainMenu
Friend WithEvents MenuItem1 As System.Windows.Forms.MenuItem
Friend WithEvents MenuItem2 As System.Windows.Forms.MenuItem
Friend WithEvents MenuItem3 As System.Windows.Forms.MenuItem
Friend WithEvents OpenFileMenu As System.Windows.Forms.MenuItem
Friend WithEvents Zoom25Menu As System.Windows.Forms.MenuItem
Friend WithEvents Zoom50Menu As System.Windows.Forms.MenuItem
Friend WithEvents Zoom100Menu As System.Windows.Forms.MenuItem
Friend WithEvents Zoom200Menu As System.Windows.Forms.MenuItem
Friend WithEvents Zoom500Menu As System.Windows.Forms.MenuItem
Friend WithEvents Skewing25Menu As System.Windows.Forms.MenuItem
Friend WithEvents Skewing50Menu As System.Windows.Forms.MenuItem
<System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
Me.MainMenu1 = New System.Windows.Forms.MainMenu
Me.MenuItem1 = New System.Windows.Forms.MenuItem
Me.MenuItem2 = New System.Windows.Forms.MenuItem
Me.MenuItem3 = New System.Windows.Forms.MenuItem
Me.OpenFileMenu = New System.Windows.Forms.MenuItem
Me.Zoom25Menu = New System.Windows.Forms.MenuItem
Me.Zoom50Menu = New System.Windows.Forms.MenuItem
Me.Zoom100Menu = New System.Windows.Forms.MenuItem
Me.Zoom200Menu = New System.Windows.Forms.MenuItem
Me.Zoom500Menu = New System.Windows.Forms.MenuItem
Me.Skewing25Menu = New System.Windows.Forms.MenuItem
Me.Skewing50Menu = New System.Windows.Forms.MenuItem
'
'MainMenu1
'
Me.MainMenu1.MenuItems.AddRange(New System.Windows.Forms.MenuItem() {Me.MenuItem1, Me.MenuItem2, Me.MenuItem3})
'
'MenuItem1
'
Me.MenuItem1.Index = 0
Me.MenuItem1.MenuItems.AddRange(New System.Windows.Forms.MenuItem() {Me.OpenFileMenu})
Me.MenuItem1.Text = "File"
'
'MenuItem2
'
Me.MenuItem2.Index = 1
Me.MenuItem2.MenuItems.AddRange(New System.Windows.Forms.MenuItem() {Me.Zoom25Menu, Me.Zoom50Menu, Me.Zoom100Menu, Me.Zoom200Menu, Me.Zoom500Menu})
Me.MenuItem2.Text = "Zoom"
'
'MenuItem3
'
Me.MenuItem3.Index = 2
Me.MenuItem3.MenuItems.AddRange(New System.Windows.Forms.MenuItem() {Me.Skewing25Menu, Me.Skewing50Menu})
Me.MenuItem3.Text = "Skewing"
'
'OpenFileMenu
'
Me.OpenFileMenu.Index = 0
Me.OpenFileMenu.Text = "Open File"
'
'Zoom25Menu
'
Me.Zoom25Menu.Index = 0
Me.Zoom25Menu.Text = "25%"
'
'Zoom50Menu
'
Me.Zoom50Menu.Index = 1
Me.Zoom50Menu.Text = "50%"
'
'Zoom100Menu
'
Me.Zoom100Menu.Index = 2
Me.Zoom100Menu.Text = "100%"
'
'Zoom200Menu
'
Me.Zoom200Menu.Index = 3
Me.Zoom200Menu.Text = "200%"
'
'Zoom500Menu
'
Me.Zoom500Menu.Index = 4
Me.Zoom500Menu.Text = "500%"
'
'Skewing25Menu
'
Me.Skewing25Menu.Index = 0
Me.Skewing25Menu.Text = "25%"
'
'Skewing50Menu
'
Me.Skewing50Menu.Index = 1
Me.Skewing50Menu.Text = "50%"
'
'Form1
'
Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
Me.ClientSize = New System.Drawing.Size(496, 378)
Me.Menu = Me.MainMenu1
Me.Name = "Form1"
Me.Text = "Scaling"
End Sub
#End Region
Private Sub OpenFileMenu_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles OpenFileMenu.Click
curImage = Image.FromFile("yourfile.jpg")
imgHeight = curImage.Height
imgWidth = curImage.Width
Invalidate()
End Sub
Private Sub Zoom25Menu_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Zoom25Menu.Click
imgHeight = imgHeight * 25 / 100
imgWidth = imgWidth * 25 / 100
Invalidate()
End Sub
Private Sub Zoom50Menu_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Zoom50Menu.Click
imgHeight = imgHeight * 50 / 100
imgWidth = imgWidth * 50 / 100
Invalidate()
End Sub
Private Sub Zoom100Menu_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Zoom100Menu.Click
imgHeight = imgHeight
imgWidth = imgWidth
Invalidate()
End Sub
Private Sub Zoom200Menu_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Zoom200Menu.Click
imgHeight = imgHeight * 200 / 100
imgWidth = imgWidth * 200 / 100
Invalidate()
End Sub
Private Sub Zoom500Menu_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Zoom500Menu.Click
imgHeight = imgHeight * 500 / 100
imgWidth = imgWidth * 500 / 100
Invalidate()
End Sub
Protected Overrides Sub OnPaint(ByVal e As PaintEventArgs)
If Not (curImage Is Nothing) Then
e.Graphics.DrawImage(curImage, AutoScrollPosition.X, AutoScrollPosition.Y, imgWidth, imgHeight)
End If
End Sub
Private Sub Skewing25Menu_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Skewing25Menu.Click
Dim g As Graphics = Me.CreateGraphics()
g.Clear(Me.BackColor)
Dim pts As Point() = {New Point(150, 20), New Point(20, 50), New Point(150, 300)}
g.DrawImage(curImage, pts)
g.Dispose()
End Sub
End Class
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