/// <summary>
/// Puts a highlight rectangle over the box which is expressed in PDF coordinate space
/// </summary>
/// <param name="p">A PDF Text page</param>
/// <param name="v">The viewer to put the annotation on</param>
/// <param name="layer">The layer to put the annotation on</param>
/// <param name="pdfBox">The box to highlight in PDF coordinate space</param>
/// <param name="hiColor">The color to highlight with</param>
/// <param name="padding">Extra padding around the box in pixels</param>
private void HighlightPdfBox(PdfTextPage p, AnnotateViewer v, LayerAnnotation layer, RectangleF pdfBox, Color hiColor, int padding)
{
RectangleF imageBox = p.ConvertPdfUnitsToPixels(new QuadrilateralF(pdfBox), v.Image.Resolution).Bounds;
imageBox.X = imageBox.X - padding;
imageBox.Y = imageBox.Y - padding;
imageBox.Width = imageBox.Width + 2 * padding;
imageBox.Height = imageBox.Height + 2 * padding;
HighlightImageBox(v, layer, imageBox, hiColor);
}
public ExplorerPanel(MainForm mainForm)
{
this.mainForm = mainForm;
this.process = mainForm.Process;
InitializeComponent();
PageBase page = new PdfTextPage(this);
this.tbcMain.TabPages[1].Controls.Add(page);
page.Dock = DockStyle.Fill;
}
/// <summary>
/// Puts an annotation over the characters in a PDF page
/// </summary>
/// <param name="v">Annotate viewer</param>
/// <param name="p">A PDF Text page</param>
/// <param name="hiColor">The highlight color</param>
/// <param name="index">The index of the first character within the page</param>
/// <param name="len">The number of characters to highlight</param>
private void HighlightChars(AnnotateViewer v, PdfTextPage p, Color hiColor, int index, int len)
{
// take off all existing hilights
LayerAnnotation layer = v.Annotations.CurrentLayer;
layer.Items.Clear();
// a single phrase can span a line and need more than one box to
// highlight it
QuadrilateralF[] pdfBoxes = p.GetBoxes(index, len);
foreach (QuadrilateralF b in pdfBoxes)
{
HighlightPdfBox(p, v, layer, b.Bounds, hiColor, 2);
}
}
/// <summary>
/// Highlights the found text on the PDF, makes sure the page is selected and the scroll
/// position is set so that the highlight can be seen
/// </summary>
/// <param name="pdfPage">The PDF Page with the text on it</param>
/// <param name="pageNum">The page number (0-based)</param>
/// <param name="charIndex">The index of the first character to highlight</param>
/// <param name="len">The length of the text to highlight</param>
public void HighlightFoundText(PdfTextPage pdfPage, int pageNum, int charIndex, int len)
{
SelectThumb(_thumbnailViewer, pageNum);
HighlightChars(_viewer, pdfPage, _hiColor, charIndex, len);
}
