PDF Select all search results

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PDF Select all search results

Post by maggarwal » Tue May 07, 2013 09:32 PM

Hi,

How can I highlight all the search results in a document? I know I can cycle through the search results but I couldn't find any way to highlight all the matches in the document.

Thanks

Re: PDF Select all search results

Post by Alex » Wed May 15, 2013 01:17 PM

Hello,

You need do the following steps if you want to highlight some objects on the image:

Create class, for example, HighlightedSearchResult, that represents the highlighted search result. This class must implement the IBoundedObject interface.
Create an instance of the HighlightTool class and make this instance as active visual tool in the image viewer.
Create instance of the HighlightedSearchResult class for each search result and add it to the collection of highlighted objects - HighlightTool.Items.

It's all that you need to do.

Best regards, Alexander

Re: PDF Select all search results

Post by maggarwal » Fri May 17, 2013 05:07 PM

How can I get all the search results? I can find text but that only runs once. Find next goes infinitely and causes stack overflow exception. Please advise. Thanks

        private void PDFViewerToolOnTextSearched(object sender, PdfTextSearchedEventArgs e)
        {
            if (e.FoundTextRegion == null)
            {
                ImageViewer.VisualTool = _highlightTool;
                _highlightTool.SelectedItem = _highlightTool.Items.First().Objects.FirstOrDefault();
            }
            else
            {
                var highlight =
                    new HighlightedSearchResult(new Rectangle((int) e.FoundTextRegion.Rectangle.X,
                                                              (int) e.FoundTextRegion.Rectangle.Y,
                                                              (int) e.FoundTextRegion.Rectangle.Width,
                                                              (int) e.FoundTextRegion.Rectangle.Height));
                _highlightTool.Items.Add(new ColoredObjects<HighlightedSearchResult>(new[] {highlight}));
                _pdfViewerTool.FindTextNext(e.SearchingText, PdfViewerTool.FindTextMode.CurrentPage, new FindTextOptions());
            }
        }

Re: PDF Select all search results

Post by Alex » Mon May 20, 2013 10:11 AM

Hello,

Your code is not correct.

First, you need create class that will represent the highlighted search result. Here is a code of such class:

class HightlightRectangle: IBoundedObject
{
    Rectangle _rect;

    public HightlightRectangle(Rectangle rect)
    {
        _rect = rect;
    }

    public Rectangle GetBoundingBox()
    {
        return _rect; 
    }
}

Next, you need create visual tool which will show highlighted objects:

class TextRegionHighlightTool : HighlightTool<HightlightRectangle>
{
    Dictionary<VintasoftImage, TextRegion[]> _imageToRegions;

    public TextRegionHighlightTool(Dictionary<VintasoftImage, TextRegion[]> imageToRegions)
    {
        _imageToRegions = imageToRegions;
    }

    protected override void OnActivate(EventArgs e)
    {
        base.OnActivate(e);
        ImageViewer.FocusedIndexChanged += new EventHandler<FocusedIndexChangedEventArgs>(ImageViewer_FocusedIndexChanged);
        ImageViewer.RenderingSettingsChanged += new EventHandler(ImageViewer_RenderingSettingsChanged);
        UpdateItems();
    }

    protected override void OnDeactivate(EventArgs e)
    {
        ImageViewer.FocusedIndexChanged -= new EventHandler<FocusedIndexChangedEventArgs>(ImageViewer_FocusedIndexChanged);
        ImageViewer.RenderingSettingsChanged -= new EventHandler(ImageViewer_RenderingSettingsChanged);
        base.OnDeactivate(e);
    }

    private void UpdateItems()
    {
        VintasoftImage image = ImageViewer.Image;
        TextRegion[] regions = _imageToRegions[image];
        HightlightRectangle[] hightlightTextRegions = new HightlightRectangle[regions.Length];
        PdfPage page = PdfViewerTool.GetPageFromImage(ImageViewer.Image);
        for (int i = 0; i < hightlightTextRegions.Length; i++)
        {
            // region rectangle in PdfPage space
            RectangleF rect = regions[i].Rectangle;

            // convert PDF page space to Image space
            rect = RectFromPdfPageSpaceToImageSpace(rect, page, image);

            hightlightTextRegions[i] = new HightlightRectangle(Rectangle.Round(rect));
        }
        ColoredObjects<HightlightRectangle> objects = new ColoredObjects<HightlightRectangle>(hightlightTextRegions);
        objects.Brush = new SolidBrush(Color.FromArgb(56, Color.Blue));
        objects.Pen = null;
        Items.Clear();
        Items.Add(objects);
    }

    private RectangleF RectFromPdfPageSpaceToImageSpace(RectangleF rect, PdfPage page, VintasoftImage image)
    {
        PointF pt1 = new PointF(rect.X, rect.Y);
        PointF pt2 = new PointF(rect.X + rect.Width, rect.Y + rect.Height);
        page.UnitsToPixels(ref pt1, image.Resolution);
        page.UnitsToPixels(ref pt2, image.Resolution);
        rect.Width = pt2.X - pt1.X;
        rect.Height = pt1.Y - pt2.Y;
        rect.X = pt1.X;
        rect.Y = pt1.Y - rect.Height;
        return rect;
    }

    void ImageViewer_FocusedIndexChanged(object sender, FocusedIndexChangedEventArgs e)
    {
        UpdateItems();
    }

    void ImageViewer_RenderingSettingsChanged(object sender, EventArgs e)
    {
        UpdateItems();
    }
}

Last, you need get all search results, create highlighted objects from results and show highlighted objects:

public void FindAllAndSelect(string text)
{
    Dictionary<VintasoftImage, TextRegion[]> searchResults = FindAll(imageViewer1.Images, text);
    TextRegionHighlightTool tool = new TextRegionHighlightTool(searchResults);
    imageViewer1.VisualTool = tool;
}

// Search text in all pages.
private Dictionary<VintasoftImage, TextRegion[]> FindAll(ImageCollection images, string text)
{
    Dictionary<VintasoftImage, TextRegion[]> results = new Dictionary<VintasoftImage, TextRegion[]>();
    FindTextOptions options = new FindTextOptions();
    options.MatchCase = false;
    for (int i = 0; i < images.Count; i++)
    {
        PdfPage page = PdfVisualTool.GetPageFromImage(images[i]);
        lock (page.Document)
        {
            List<TextRegion> regions = new List<TextRegion>();
            int charIndex = 0;
            while (true)
            {
                TextRegion region = page.TextRegion.FindText(text, ref charIndex, options);
                charIndex += text.Length;
                if (region != null)
                    regions.Add(region);
                else
                    break;
            }
            results.Add(images[i], regions.ToArray());
        }
    }
    return results;
}

We will simplify this code in version 7.0.

Best regards, Alexander

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