/// <summary>Places retrieved text to canvas to a separate layer.</summary>
/// <param name="imageSize">
/// size of the image according to the selected
/// <see cref="ScaleMode"/>
/// </param>
/// <param name="pageText">text that was found on this image (or on this page)</param>
/// <param name="pdfCanvas">canvas to place the text</param>
/// <param name="multiplier">coefficient to adjust text placing on canvas</param>
/// <param name="pageMediaBox">page parameters</param>
private void AddTextToCanvas(Rectangle imageSize, IList <TextInfo> pageText, PdfCanvas pdfCanvas, float multiplier
, Rectangle pageMediaBox)
{
if (pageText != null && pageText.Count > 0)
{
Point imageCoordinates = PdfCreatorUtil.CalculateImageCoordinates(ocrPdfCreatorProperties.GetPageSize(), imageSize
);
foreach (TextInfo item in pageText)
{
String line = item.GetText();
IList <float> coordinates = item.GetBbox();
float left = coordinates[0] * multiplier;
float right = (coordinates[2] + 1) * multiplier - 1;
float top = coordinates[1] * multiplier;
float bottom = (coordinates[3] + 1) * multiplier - 1;
float bboxWidthPt = PdfCreatorUtil.GetPoints(right - left);
float bboxHeightPt = PdfCreatorUtil.GetPoints(bottom - top);
FontProvider fontProvider = GetOcrPdfCreatorProperties().GetFontProvider();
String fontFamily = GetOcrPdfCreatorProperties().GetDefaultFontFamily();
if (!String.IsNullOrEmpty(line) && bboxHeightPt > 0 && bboxWidthPt > 0)
{
Document document = new Document(pdfCanvas.GetDocument());
document.SetFontProvider(fontProvider);
// Scale the text width to fit the OCR bbox
float fontSize = PdfCreatorUtil.CalculateFontSize(document, line, fontFamily, bboxHeightPt, bboxWidthPt);
float lineWidth = PdfCreatorUtil.GetRealLineWidth(document, line, fontFamily, fontSize);
float deltaX = PdfCreatorUtil.GetPoints(left);
float deltaY = imageSize.GetHeight() - PdfCreatorUtil.GetPoints(bottom);
iText.Layout.Canvas canvas = new iText.Layout.Canvas(pdfCanvas, pageMediaBox);
canvas.SetFontProvider(fontProvider);
Text text = new Text(line).SetHorizontalScaling(bboxWidthPt / lineWidth);
Paragraph paragraph = new Paragraph(text).SetMargin(0).SetMultipliedLeading(1.2f);
paragraph.SetFontFamily(fontFamily).SetFontSize(fontSize);
paragraph.SetWidth(bboxWidthPt * 1.5f);
if (ocrPdfCreatorProperties.GetTextColor() != null)
{
paragraph.SetFontColor(ocrPdfCreatorProperties.GetTextColor());
}
else
{
paragraph.SetTextRenderingMode(PdfCanvasConstants.TextRenderingMode.INVISIBLE);
}
canvas.ShowTextAligned(paragraph, deltaX + (float)imageCoordinates.x, deltaY + (float)imageCoordinates.y,
TextAlignment.LEFT);
canvas.Close();
}
}
}
}
/// <summary>Adds image (or its one page) and text that was found there to canvas.</summary>
/// <param name="pdfDocument">
/// result
/// <see cref="iText.Kernel.Pdf.PdfDocument"/>
/// </param>
/// <param name="imageSize">
/// size of the image according to the selected
/// <see cref="ScaleMode"/>
/// </param>
/// <param name="pageText">text that was found on this image (or on this page)</param>
/// <param name="imageData">
/// input image if it is a single page or its one page if
/// this is a multi-page image
/// </param>
/// <param name="createPdfA3u">true if PDF/A3u document is being created</param>
private void AddToCanvas(PdfDocument pdfDocument, Rectangle imageSize, IList <TextInfo> pageText, ImageData
imageData, bool createPdfA3u)
{
Rectangle rectangleSize = ocrPdfCreatorProperties.GetPageSize() == null ? imageSize : ocrPdfCreatorProperties
.GetPageSize();
PageSize size = new PageSize(rectangleSize);
PdfPage pdfPage = pdfDocument.AddNewPage(size);
PdfCanvas canvas = new OcrPdfCreator.NotDefCheckingPdfCanvas(pdfPage, createPdfA3u);
PdfLayer[] layers = CreatePdfLayers(ocrPdfCreatorProperties.GetImageLayerName(), ocrPdfCreatorProperties.GetTextLayerName
(), pdfDocument);
if (layers[0] != null)
{
canvas.BeginLayer(layers[0]);
}
AddImageToCanvas(imageData, imageSize, canvas);
if (layers[0] != null && layers[0] != layers[1])
{
canvas.EndLayer();
}
// how much the original image size changed
float multiplier = imageData == null ? 1 : imageSize.GetWidth() / PdfCreatorUtil.GetPoints(imageData.GetWidth
());
if (layers[1] != null && layers[0] != layers[1])
{
canvas.BeginLayer(layers[1]);
}
try {
AddTextToCanvas(imageSize, pageText, canvas, multiplier, pdfPage.GetMediaBox());
}
catch (OcrException e) {
LOGGER.Error(MessageFormatUtil.Format(OcrException.CANNOT_CREATE_PDF_DOCUMENT, e.Message));
throw new OcrException(OcrException.CANNOT_CREATE_PDF_DOCUMENT).SetMessageParams(e.Message);
}
if (layers[1] != null)
{
canvas.EndLayer();
}
}
