Painting Pages and Zones

Start with the program you created in Working with Recognition Results.

In the "Solution Explorer" window, right-click on the Project Name, and select Add -> "Add Existing Item" from the context menu.

In the "Add Existing Item" dialog box, browse for "C:\Program Files\LEAD Technologies\LEADTOOLS 15\Examples\DotNet\VB\OcrDemo\UI" or "C:\Program Files\LEAD Technologies\LEADTOOLS 15\Examples\DotNet\CS\OcrDemo\UI" and select "OcrRasterImageViewer.vb" or "OcrRasterImageViewer.cs".

NOTE: You may have to change the actual folder name, if you installed LEADTOOLS to a folder other than the default.

Drag and drop three buttons in Form1. Leave all the buttons names as the default "button14, button15 ...", then change the following properties of button14:

Property	Value
Text	Draw Zone

Change the following properties of button15:

Property	Value
Text	Draw Page

In the "Solution Explorer" window, right-click on the "References" folder, and select "Add Reference…" from the context menu. In the "Add Reference" dialog box, select the ".NET" tab and browse to Leadtools For .NET "\LEAD Technologies\LEADTOOLS 15\Bin\DotNet\Win32 " folder and select the following DLLs:

Leadtools.WinForms.dll

Click the Select button and then press the OK button to add the above DLLs to the application.

Switch to Form1 code view (right-click Form1 in the solution explorer then select View Code ) and add the following lines at the beginning of the file:

[Visual Basic]


Imports Leadtools.WinForms

[C#]


using Leadtools.WinForms;

Add the following private variables to Form1 class:

[Visual Basic]


Private WithEvents viewer As OcrRasterImageViewer

[C#]


private OcrDemo.OcrRasterImageViewer viewer;

Add the following code at the end of Form_Load procedure:

[Visual Basic]


' Initialize the Ocr viewer
viewer = New OcrRasterImageViewer
viewer.BackColor = Color.DarkCyan
viewer.Dock = DockStyle.Fill
Controls.Add(viewer)
viewer.InteractiveMode = RasterViewerInteractiveMode.Pan

[C#]


// Initialize the Ocr viewer
viewer = new OcrDemo.OcrRasterImageViewer();
viewer.BackColor = Color.DarkCyan;
viewer.Dock = DockStyle.Fill;
Controls.Add(viewer);
viewer.InteractiveMode = RasterViewerInteractiveMode.Pan;

Add the following code at button2 control’s click procedure:

[Visual Basic]

After the line


Dim rasterImage As RasterImage = codecs.Load("C:\Program Files\LEAD Technologies\LEADTOOLS 15\Images\ocr1.tif")

Add the following line


viewer.Image = rasterImage.Clone

[C#]

In the Block


using (RasterImage rasterImage = codecs.Load(@"C:\Program Files\LEAD Technologies\LEADTOOLS 15\Images\ocr1.tif"))

Add the following line


viewer.Image = rasterImage.Clone();

Add the following code in the beginning of button3 control’s click procedure:

[Visual Basic]

 
viewer.DrawPage = False
viewer.OcrMode = False
viewer.Image.Dispose()
viewer.Image = Nothing

[C#]

 
viewer.DrawPage = false;
viewer.OcrMode = false;
viewer.Image.Dispose();
viewer.Image = null;

Add the following code in button14 control’s click procedure:

[Visual Basic]


Private Sub button14_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles button14.Click
   ' When you call DrawPage, the page zones will not be drawn. 
   Dim zoneOpts As RasterDocumentDrawZoneOptions = rasterDocument.DrawZoneOptions
   zoneOpts.Visible = Not (zoneOpts.Visible)
End Sub

[C#]


private void button14_Click(object sender, System.EventArgs e)
{
   // When you call DrawPage, the page zones will not be drawn.
   RasterDocumentDrawZoneOptions zoneOpts = rasterDocument.DrawZoneOptions;
   zoneOpts.Visible = !zoneOpts.Visible;
}

Add the following code in button15 control’s click procedure:

[Visual Basic]


Private Sub button15_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles button15.Click
   ' Initialize a new Graphics object
   Dim graph As System.Drawing.Graphics = viewer.CreateGraphics()
   
   ' Draw the first page of the RasterDocument object
   rasterDocument.ActivePage = 0
   viewer.RasterDocument = rasterDocument
   viewer.OcrMode = True
   viewer.DrawPage = True
   viewer.Refresh()
End Sub

[C#]


private void button15_Click(object sender, System.EventArgs e)
{
   // Initialize a new Graphics object
   System.Drawing.Graphics graph = viewer.CreateGraphics();
   
   // Draw the first page of the RasterDocument object
   rasterDocument.ActivePage = 0;
   viewer.RasterEngine = rasterDocument;
   viewer.OcrMode  = true;
   viewer.DrawPage = true;
   viewer.Refresh();
}

Build, and Run the project to test it.

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Painting Pages and Zones