Extracting text from a selected zone

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Matt Parizeau

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Dec 1, 2016, 2:35:35 PM12/1/16
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Q:

I need to draw a rectangle to let the user select a zone and get the text underneath it. Is this possible?

A:

Yes, here is some sample code of a custom tool that can do this:

Tools.TextTool['SELECTION_MODE'] = "rectangular";
var TextExtractTool = function(docViewer) {
 
Tools.RectangleCreateTool.apply(this, arguments);
};
TextExtractTool.prototype = new Tools.RectangleCreateTool();

$
(document).on("documentLoaded", function(event) {
  $
('#overflowToolsContainer').prepend('<span data-toolmode="TextExtract" class="annotTool glyphicons" title="Image Selection"><img src="myimage.png"/></span>');

 
var am = readerControl.getDocumentViewer().getAnnotationManager();
 
var textExtractTool = 'TextExtract';
  readerControl
.toolModeMap[textExtractTool] = new TextExtractTool(readerControl.docViewer);

  readerControl
.toolModeMap[textExtractTool].on('annotationAdded', function(e, annotation) {
    getSelectedText
(annotation, function(text) {
      alert
('Extracted Text: ' + text);
     
var annotManager = readerControl.docViewer.getAnnotationManager();
      annotManager
.deleteAnnotation(annotation);
   
});
 
});

 
function getSelectedText(annotation, callback) {
   
var docViewer = readerControl.docViewer;
    docViewer
.on('textSelected.highlight', function(e, quads, text) {
      docViewer
.off('textSelected.highlight');
      docViewer
.clearSelection();
      callback
(text);
   
});

   
var topLeft = {
      x
: annotation.X,
      y
: annotation.Y,
      pageIndex
: annotation.PageNumber - 1
   
};
   
var bottomRight = {
      x
: annotation.X + annotation.Width,
      y
: annotation.Y + annotation.Height,
      pageIndex
: annotation.PageNumber - 1
   
};
   
var textSelectTool = new Tools.TextSelectTool(docViewer);
    textSelectTool
.select(topLeft, bottomRight);
 
}

  readerControl
.setToolMode(textExtractTool);
});

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