hello, everyone i had a project which will have a function to resize the images in the picturebox..i've seen some code snippet in resizing the images. The code works fine but it automatically resizes the image when i run the program..what i need is that the user will be the one who will resize the pictures..does anyone knows how to do this? i'm using vb 2008. Any help is appreciated..
cutieann12 0 Newbie Poster
Teme64 215 Veteran Poster
I did a resizeable picture box as an user control some time ago. The picture box (= user control) maintains it's size, but you can zoom in and out the image with Zoom property.
Option Explicit On
Option Strict On
Imports System
Imports System.ComponentModel
Imports System.Drawing
Imports System.Drawing.Drawing2D
Imports System.Windows.Forms
Public Class CPictureBox
Inherits ScrollableControl
'--------------------------------------------------------
' CPictureBox.vb
'--------------------------------------------------------
'--------------------------------------------------------
' CPictureBox Control
'--------------------------------------------------------
'--------------------------------------------------------
' Copyright © 2007-2008 xxx
'
' Language: Visual Basic 2005.NET
'
' Version: 1.0.0
'
' Created: 10.12.2007 xxx
'
' Modified: 29.4.2008 xxx
'--------------------------------------------------------
'--------------------------------------------------------
' Public data
'--------------------------------------------------------
'--------------------------------------------------------
' Private data
'--------------------------------------------------------
Private m_Image As Image
Private m_Zoom As Single = 1.0F
Private m_InterpolationMode As InterpolationMode = InterpolationMode.High
'--------------------------------------------------------
' Private procedures
'--------------------------------------------------------
Private Sub InitComponent()
'
' Init component
'
Try
Me.SetStyle(ControlStyles.AllPaintingInWmPaint Or ControlStyles.UserPaint Or ControlStyles.ResizeRedraw Or ControlStyles.UserPaint Or ControlStyles.DoubleBuffer, True)
Me.AutoScroll = True
'Me.BackColor = Color.White
m_InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High
m_Zoom = 1.0!
m_Image = Nothing
Catch ex As Exception
End Try
End Sub
Private Sub UpdateScaleFactor()
'
' Update scale factor
'
Try
If m_Image Is Nothing Then
Me.AutoScrollMargin = Me.Size
Else
Me.AutoScrollMinSize = New Size(CInt(Me.m_Image.Width * m_Zoom + 0.5F), CInt(Me.m_Image.Height * m_Zoom + 0.5F))
End If
Catch ex As Exception
End Try
End Sub
'--------------------------------------------------------
' Event handlers
'--------------------------------------------------------
Public Sub New()
'
' Initialize
'
Try
InitComponent()
Catch ex As Exception
End Try
End Sub
Protected Overrides Sub Finalize()
'
' Terminate control
'
Try
MyBase.Finalize()
Catch ex As Exception
End Try
End Sub
Protected Overrides Sub OnPaintBackground(ByVal e As PaintEventArgs)
'
' Do nothing
'
Try
' Do nothing
Catch ex As Exception
End Try
End Sub
Protected Overrides Sub OnPaint(ByVal e As PaintEventArgs)
'
' If no image, don't bother
'
Try
If m_Image Is Nothing Then
MyBase.OnPaintBackground(e)
Exit Sub
End If
' Set up a zoom matrix
Dim mx As New Matrix(m_Zoom, 0, 0, m_Zoom, 0, 0)
mx.Translate(Me.AutoScrollPosition.X / m_Zoom, Me.AutoScrollPosition.Y / m_Zoom)
e.Graphics.Transform = mx
e.Graphics.InterpolationMode = m_InterpolationMode
e.Graphics.DrawImage(m_Image, New Rectangle(0, 0, Me.m_Image.Width, Me.m_Image.Height), 0, 0, m_Image.Width, m_Image.Height, GraphicsUnit.Pixel)
MyBase.OnPaint(e)
Catch ex As Exception
End Try
End Sub
'--------------------------------------------------------
' Public procedures
'--------------------------------------------------------
''' <summary>
''' Sets or gets the image in CPictureBox
''' </summary>
''' <value>Image</value>
''' <returns>Image</returns>
''' <remarks></remarks>
Public Property Image() As Image
'
Get
Return m_Image
End Get
Set(ByVal value As Image)
m_Image = value
If m_Image IsNot Nothing Then
If m_Image.Height > 0 Then
m_Zoom = CSng(Me.Height / m_Image.Height)
Else
m_Zoom = 1.0!
End If
End If
UpdateScaleFactor()
Invalidate()
End Set
End Property
''' <summary>
''' Sets or gets the zoom factor
''' </summary>
''' <value>Zoom factor</value>
''' <returns>Zoom factor</returns>
''' <remarks>Zoom factor should be between 0-5</remarks>
Public Property Zoom() As Single
'
Get
Return m_Zoom
End Get
Set(ByVal value As Single)
If value < 0 OrElse value < 0.00001 Then
value = 0.00001F
End If
m_Zoom = value
UpdateScaleFactor()
Invalidate()
End Set
End Property
''' <summary>
''' Sets or gets the interpolation mode used in the drawing
''' </summary>
''' <value>System.Drawing.Drawing2D.InterpolationMode</value>
''' <returns>System.Drawing.Drawing2D.InterpolationMode</returns>
''' <remarks></remarks>
Public Property InterpolationMode() As InterpolationMode
' The interpolation mode used to smooth the drawing
Get
Return m_InterpolationMode
End Get
Set(ByVal value As InterpolationMode)
m_InterpolationMode = value
End Set
End Property
End ClassHaven't used the control for a while and it surely misses features :) But I hope that the zooming functionality helps you.
The code was written with VB 2005 and VB 2008 may have some of the functionality "built-in".
cutieann12 0 Newbie Poster
I did a resizeable picture box as an user control some time ago. The picture box (= user control) maintains it's size, but you can zoom in and out the image with Zoom property.
Option Explicit On Option Strict On Imports System Imports System.ComponentModel Imports System.Drawing Imports System.Drawing.Drawing2D Imports System.Windows.Forms Public Class CPictureBox Inherits ScrollableControl '-------------------------------------------------------- ' CPictureBox.vb '-------------------------------------------------------- '-------------------------------------------------------- ' CPictureBox Control '-------------------------------------------------------- '-------------------------------------------------------- ' Copyright © 2007-2008 xxx ' ' Language: Visual Basic 2005.NET ' ' Version: 1.0.0 ' ' Created: 10.12.2007 xxx ' ' Modified: 29.4.2008 xxx '-------------------------------------------------------- '-------------------------------------------------------- ' Public data '-------------------------------------------------------- '-------------------------------------------------------- ' Private data '-------------------------------------------------------- Private m_Image As Image Private m_Zoom As Single = 1.0F Private m_InterpolationMode As InterpolationMode = InterpolationMode.High '-------------------------------------------------------- ' Private procedures '-------------------------------------------------------- Private Sub InitComponent() ' ' Init component ' Try Me.SetStyle(ControlStyles.AllPaintingInWmPaint Or ControlStyles.UserPaint Or ControlStyles.ResizeRedraw Or ControlStyles.UserPaint Or ControlStyles.DoubleBuffer, True) Me.AutoScroll = True 'Me.BackColor = Color.White m_InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High m_Zoom = 1.0! m_Image = Nothing Catch ex As Exception End Try End Sub Private Sub UpdateScaleFactor() ' ' Update scale factor ' Try If m_Image Is Nothing Then Me.AutoScrollMargin = Me.Size Else Me.AutoScrollMinSize = New Size(CInt(Me.m_Image.Width * m_Zoom + 0.5F), CInt(Me.m_Image.Height * m_Zoom + 0.5F)) End If Catch ex As Exception End Try End Sub '-------------------------------------------------------- ' Event handlers '-------------------------------------------------------- Public Sub New() ' ' Initialize ' Try InitComponent() Catch ex As Exception End Try End Sub Protected Overrides Sub Finalize() ' ' Terminate control ' Try MyBase.Finalize() Catch ex As Exception End Try End Sub Protected Overrides Sub OnPaintBackground(ByVal e As PaintEventArgs) ' ' Do nothing ' Try ' Do nothing Catch ex As Exception End Try End Sub Protected Overrides Sub OnPaint(ByVal e As PaintEventArgs) ' ' If no image, don't bother ' Try If m_Image Is Nothing Then MyBase.OnPaintBackground(e) Exit Sub End If ' Set up a zoom matrix Dim mx As New Matrix(m_Zoom, 0, 0, m_Zoom, 0, 0) mx.Translate(Me.AutoScrollPosition.X / m_Zoom, Me.AutoScrollPosition.Y / m_Zoom) e.Graphics.Transform = mx e.Graphics.InterpolationMode = m_InterpolationMode e.Graphics.DrawImage(m_Image, New Rectangle(0, 0, Me.m_Image.Width, Me.m_Image.Height), 0, 0, m_Image.Width, m_Image.Height, GraphicsUnit.Pixel) MyBase.OnPaint(e) Catch ex As Exception End Try End Sub '-------------------------------------------------------- ' Public procedures '-------------------------------------------------------- ''' <summary> ''' Sets or gets the image in CPictureBox ''' </summary> ''' <value>Image</value> ''' <returns>Image</returns> ''' <remarks></remarks> Public Property Image() As Image ' Get Return m_Image End Get Set(ByVal value As Image) m_Image = value If m_Image IsNot Nothing Then If m_Image.Height > 0 Then m_Zoom = CSng(Me.Height / m_Image.Height) Else m_Zoom = 1.0! End If End If UpdateScaleFactor() Invalidate() End Set End Property ''' <summary> ''' Sets or gets the zoom factor ''' </summary> ''' <value>Zoom factor</value> ''' <returns>Zoom factor</returns> ''' <remarks>Zoom factor should be between 0-5</remarks> Public Property Zoom() As Single ' Get Return m_Zoom End Get Set(ByVal value As Single) If value < 0 OrElse value < 0.00001 Then value = 0.00001F End If m_Zoom = value UpdateScaleFactor() Invalidate() End Set End Property ''' <summary> ''' Sets or gets the interpolation mode used in the drawing ''' </summary> ''' <value>System.Drawing.Drawing2D.InterpolationMode</value> ''' <returns>System.Drawing.Drawing2D.InterpolationMode</returns> ''' <remarks></remarks> Public Property InterpolationMode() As InterpolationMode ' The interpolation mode used to smooth the drawing Get Return m_InterpolationMode End Get Set(ByVal value As InterpolationMode) m_InterpolationMode = value End Set End Property End ClassHaven't used the control for a while and it surely misses features :) But I hope that the zooming functionality helps you.
The code was written with VB 2005 and VB 2008 may have some of the functionality "built-in".
i got this error message when i use the code...Base class 'System.Windows.Forms.ScrollableControl' specified for class 'CPictureBox' cannot be different from the base class 'System.Windows.Forms.Form' of one of its other partial types. what does it mean?
Teme64 215 Veteran Poster
I'm not sure :( Like I said, I wrote it for 2005 and haven't tested it on 2008.
I would check first the references, it requires three of them:
- System
- System.Drawing
- System.Windows.Forms
Also, the inherited ScrollableControl I used was .NET 2.0 version. It may be different in .NET 3.5.
And lastly here's a documentation for that error. It might help you solve the error you get.
cutieann12 0 Newbie Poster
hello..i'm sorry i could not understand the code would you mind clearing it to me..i'm new in vb.net thank you...
Manos_Arriba 0 Newbie Poster
This code will need to be placed in a class rather than a form with it being a control.
AckleyBarr 0 Newbie Poster
The code seems to be easy but i have no experience in coding so should i do the basics course for vb.net or not ?I want to do programming so guide me.
Manos_Arriba 0 Newbie Poster
I had previous experience using VBA in MS Access so really going to VB.NET was what I felt comfortable with. I would suggest getting a couple of starter books, one on c# and one on vb.net. Then make the choice based on which language you prefer, before spending money on a course. Plus there are loads of great examples that people post on websites such as codeproject, and there are loads of great forums where people are very helpful with any queries you have.
kvprajapati 1,826 Posting Genius Team Colleague
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