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Pan and Zoom Very Large Images

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31 Oct 2009Ms-PL5 min read 757.1K   16.1K   186  
Smoothly panning and zooming very large images can be a challenge. Here’s a control, with source code, that demonstrates one way of overcoming this challenge, as well as a few "Extra" image processing features.
'------------------------------------------------------------------------------
' <auto-generated>
'     This code was generated by a tool.
'     Runtime Version:2.0.50727.42
'
'     Changes to this file may cause incorrect behavior and will be lost if
'     the code is regenerated.
' </auto-generated>
'------------------------------------------------------------------------------

Option Strict On
Option Explicit On


Namespace My

    <Global.System.Runtime.CompilerServices.CompilerGeneratedAttribute(),  _
     Global.System.CodeDom.Compiler.GeneratedCodeAttribute("Microsoft.VisualStudio.Editors.SettingsDesigner.SettingsSingleFileGenerator", "8.0.0.0"),  _
     Global.System.ComponentModel.EditorBrowsableAttribute(Global.System.ComponentModel.EditorBrowsableState.Advanced)>  _
    Partial Friend NotInheritable Class MySettings
        Inherits Global.System.Configuration.ApplicationSettingsBase
        
        Private Shared defaultInstance As MySettings = CType(Global.System.Configuration.ApplicationSettingsBase.Synchronized(New MySettings), MySettings)
        
#Region "My.Settings Auto-Save Functionality"
#If _MyType = "WindowsForms" Then
        Private Shared addedHandler As Boolean

        Private Shared addedHandlerLockObject As New Object

        <Global.System.Diagnostics.DebuggerNonUserCodeAttribute(), Global.System.ComponentModel.EditorBrowsableAttribute(Global.System.ComponentModel.EditorBrowsableState.Advanced)> _
        Private Shared Sub AutoSaveSettings(ByVal sender As Global.System.Object, ByVal e As Global.System.EventArgs)
            If My.Application.SaveMySettingsOnExit Then
                My.Settings.Save()
            End If
        End Sub
#End If
#End Region
        
        Public Shared ReadOnly Property [Default]() As MySettings
            Get
                
#If _MyType = "WindowsForms" Then
                   If Not addedHandler Then
                        SyncLock addedHandlerLockObject
                            If Not addedHandler Then
                                AddHandler My.Application.Shutdown, AddressOf AutoSaveSettings
                                addedHandler = True
                            End If
                        End SyncLock
                    End If
#End If
                Return defaultInstance
            End Get
        End Property
    End Class
End Namespace

Namespace My
    
    <Global.Microsoft.VisualBasic.HideModuleNameAttribute(),  _
     Global.System.Diagnostics.DebuggerNonUserCodeAttribute(),  _
     Global.System.Runtime.CompilerServices.CompilerGeneratedAttribute()>  _
    Friend Module MySettingsProperty
        
        <Global.System.ComponentModel.Design.HelpKeywordAttribute("My.Settings")>  _
        Friend ReadOnly Property Settings() As Global.Test_Harness.My.MySettings
            Get
                Return Global.Test_Harness.My.MySettings.Default
            End Get
        End Property
    End Module
End Namespace

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License

This article, along with any associated source code and files, is licensed under The Microsoft Public License (Ms-PL)


Written By
Software Developer (Senior)
United States United States
I started my career in software development back in 2000. Prior to that, I made my living as a detail drafter. My true start in programming, though, goes back much further. I first started learning to program when I was about 10 years old. It was back in ‘82 that I wrote my first application. It was a simple calculator program written on a TRS-80 that my uncle had. Since then, I’ve programmed in Basic, QuickBasic, Pascal, C++, VB 6, VB.NET, Java, HTML, and C #. I have a very diverse background. I’ve worked and written software for several types of companies, including manufacturing, engineering, and finance. I’ve had the opportunity to design and maintain a few enterprise level databases, I’ve written applications to run on windows CE, in a wireless manufacturing environment. I’ve also had opportunities to teach OOP methodologies, and design patterns. I thoroughly enjoy what I do, and my only regret is that I didn’t start sooner.

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