/**
* We get into this method when the current chunk is not visible.
* Here we are calculating a piece of the Tj coefficient for a previous visible chunk.
* For details see PDF spec., Text Space Details, formula for "tx" coefficient
* and TextRenderInfo class (getUnscaledBaseline)
*/
private float GetUnscaledTextChunkWidth(PdfCleanUpContentChunk.Text chunk, float characterSpacing,
float wordSpacing, float fontSize, float horizontalScaling)
{
// We should multiply by 100 because iText stores horizontal scaling as the value in [0, 1] interval;
// also we need to add character and word spaces because TextRenderInfo class truncates them from the end of the string
// (single character string in our case is also truncated)
float scaledChunkWidth = (chunk.EndX - chunk.StartX) * 100f +
(characterSpacing + (IsSpace(chunk) ? wordSpacing : 0)) * horizontalScaling * 100f;
return(-scaledChunkWidth * 1000f / (horizontalScaling * 100f * fontSize));
}
private bool IsSpace(PdfCleanUpContentChunk.Text chunk)
{
return(chunk.GetText().ToUnicodeString() == " ");
}
/**
* Writes parts of text which are visible into a content stream.
*/
private void WriteTextChunks(IDictionary <int, float> structuredTJoperands, IList <PdfCleanUpContentChunk> chunks, PdfContentByte canvas,
float characterSpacing, float wordSpacing, float fontSize, float horizontalScaling)
{
canvas.SetCharacterSpacing(0);
canvas.SetWordSpacing(0);
canvas.InternalBuffer.Append((byte)'[');
float convertedCharacterSpacing = -characterSpacing * 1000f / fontSize;
float convertedWordSpacing = -wordSpacing * 1000f / fontSize;
float shift = structuredTJoperands != null ? structuredTJoperands[0] : 0;
PdfCleanUpContentChunk.Text prevChunk = null;
foreach (PdfCleanUpContentChunk chunk in chunks)
{
PdfCleanUpContentChunk.Text textChunk = (PdfCleanUpContentChunk.Text)chunk;
if (prevChunk != null && prevChunk.NumOfStrTextBelongsTo != textChunk.NumOfStrTextBelongsTo &&
structuredTJoperands != null)
{
shift += structuredTJoperands[prevChunk.NumOfStrTextBelongsTo];
}
if (textChunk.Visible)
{
if (Util.Compare(shift, 0.0f) != 0 && Util.Compare(shift, -0.0f) != 0)
{
canvas.InternalBuffer.Append(shift).Append(' ');
}
textChunk.GetText().ToPdf(canvas.PdfWriter, canvas.InternalBuffer);
canvas.InternalBuffer.Append(' ');
shift = convertedCharacterSpacing + (IsSpace(textChunk) ? convertedWordSpacing : 0);
}
else
{
shift += GetUnscaledTextChunkWidth(textChunk, characterSpacing, wordSpacing,
fontSize, horizontalScaling);
}
prevChunk = textChunk;
}
if (Util.Compare(shift, 0) != 0 && Util.Compare(shift, -0.0f) != 0)
{
canvas.InternalBuffer.Append(shift);
}
canvas.InternalBuffer.Append(TJ);
if (Util.Compare(characterSpacing, 0) != 0 && Util.Compare(characterSpacing, -0.0f) != 0)
{
new PdfNumber(characterSpacing).ToPdf(canvas.PdfWriter, canvas.InternalBuffer);
canvas.InternalBuffer.Append(Tc);
}
if (Util.Compare(wordSpacing, 0) != 0 && Util.Compare(wordSpacing, -0.0f) != 0)
{
new PdfNumber(wordSpacing).ToPdf(canvas.PdfWriter, canvas.InternalBuffer);
canvas.InternalBuffer.Append(Tw);
}
}
