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1. First, add necessary "Imports" statements. Open the code for the form by right-clicking on the form and clicking View Code. At the top of the code, add the following statements:
   

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   Imports System.IO Imports System.Diagnostics Imports ImageGear Imports ImageGear.Core Imports ImageGear.Windows.Forms Imports ImageGear.Display Imports ImageGear.Processing Imports ImageGear.Formats

2. Next, add the following member variables to Form1: 
   

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   ' holds the image data Private igPage As ImGearPage ' controls how the page is displayed Private igPageDisplay As ImGearPageDisplay

3. If you are using a Deployment (Runtime) licensing, add the license initialization code to the Form1 constructor(Form1()) just before the call to InitializeComponent. This is not necessary if you are using an Evaluation or Development (Toolkit) license.
   

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   '***The SetSolutionName, SetSolutionKey and possibly the SetOEMLicenseKey 'methods must be called to distribute the runtime.*** 'ImGearLicense.SetSolutionName("YourSolutionName") 'ImGearLicense.SetSolutionKey(12345, 12345, 12345, 12345) 'Manually Reported Runtime licenses also require the following method 'call to SetOEMLicenseKey. 'ImGearLicense.SetOEMLicenseKey("2.0.AStringForOEMLicensing...");

4. Below the code from the prior step, add the following calls to initialize the referenced formats:
   

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   ' Support for common formats: ImGearCommonFormats.Initialize()

5. Now add the following code to the Load Page menu handler.
   

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   LoadPageToolStripMenuItem.Click Dim dlg As New OpenFileDialog dlg.Filter = "All files (*.*)|*.*" dlg.FilterIndex = 1 dlg.RestoreDirectory = True If dlg.ShowDialog = DialogResult.OK Then Dim stream As New FileStream(dlg.FileName, FileMode.Open, FileAccess.Read) Try ' load the image into the page igPage = ImGearFileFormats.LoadPage(stream, 0) Catch ex As Exception Console.WriteLine("Failed to load image") End Try If Not igPage Is Nothing AndAlso Not igPage.DIB Is Nothing Then ' create a new page display igPageDisplay = New ImGearPageDisplay(igPage) ' associate the page display with the page view ImGearPageView1.Display = igPageDisplay ' cause the page view to repaint ImGearPageView1.Invalidate() End If End If End Sub

   The code above utilizes:

   ImGearPageDisplay Class	Constructs a new PageDisplay object for the given page.
   ImGearPageView Class.Invalidate	Invalidates the control thus causing it to repaint.
   ImGearFileFormats Class.LoadPage Method	Loads a file from a given stream and returns a new ImGearPage Class.
   ImGearFileFormats Class.GetSavingFilter Method	Gets a filter string which can be passed to a windows common dialog filter member.

6. Now go to the handler created for the Zoom In menu item. Add the following code to the routine:
   

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   If Not igPageDisplay Is Nothing AndAlso Not igPageDisplay.Page.DIB.IsEmpty() Then ' get the current zoom info Dim igZoomInfo As ImGearZoomInfo igZoomInfo = igPageDisplay.GetZoomInfo(ImGearPageView1) ' increase the zoom igZoomInfo.Horizontal.Value = igZoomInfo.Horizontal.Value * 1.25 igZoomInfo.Vertical.Value = igZoomInfo.Vertical.Value * 1.25 igZoomInfo.Horizontal.Fixed = True igZoomInfo.Vertical.Fixed = True ' set the new zoom values and repaint the view igPageDisplay.UpdateZoomFrom(igZoomInfo) ImGearPageView1.Invalidate() End If

   The code above utilizes:

   ImGearPageDisplay Class.GetZoomInfo Method	Retrieves the current zoom information from the display and page view.
   ImGearPageDisplay Class.UpdateZoomFrom Method	Sets new zoom values from the given ImGearZoomInfo Structure object.
   ImGearZoomInfo Structure	Holds horizontal and vertical zoom values and settings.

7. Add the following code to the Zoom Out click handler:
   

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   If Not igPageDisplay Is Nothing AndAlso Not igPageDisplay.Page.DIB.IsEmpty() Then ' get the current zoom info Dim igZoomInfo As ImGearZoomInfo igZoomInfo = igPageDisplay.GetZoomInfo(ImGearPageView1) ' decrease the zoom igZoomInfo.Horizontal.Value = igZoomInfo.Horizontal.Value / 1.25 igZoomInfo.Vertical.Value = igZoomInfo.Vertical.Value / 1.25 igZoomInfo.Horizontal.Fixed = True igZoomInfo.Vertical.Fixed = True ' set the new zoom values and repaint the view igPageDisplay.UpdateZoomFrom(igZoomInfo) ImGearPageView1.Invalidate() End If

8. Add the code below to the Rotate 90 click handler.
   

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   If Not igPage Is Nothing Then Try ImGearProcessing.Rotate(igPage, ImGearRotationValues.VALUE_90) Catch ex As Exception Console.WriteLine(ex.Message) End Try ImGearPageView1.Invalidate() End If

   The code above utilizes:

   ImGearProcessing Class.Rotate Method

   Rotates the given page by the given amount.

9. The code for the click handlers for the Rotate 180 and Rotate 270 menu items are the same as above except that the amount to rotate by is ImGearRotationValues.VALUE_180 and ImGearRotationValues.VALUE_270, respectively.
10. Lastly, we can add the click code for the Exit menu item as shown below:
    

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    Application.Exit()

11. And now you're ready to compile and run the finished application.
    

 

 

 

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