Hi All
I have made some more improvements to DrawMultiLineText() function of PdfPainter class. Current behavior is roughly as follows: We will calculate the top of the topmost each line based on vertical alignment. We will calculate the coordinates for baseline by subtracting Ascent metric of the font. There is slight improvement to be made. Currently we are not considering LineGap when we calculate the baseline,(or we are keeping whole line gap below the font) After testing various cases with Word processing applications like Word and Libreoffice and WPF outputs and comparing them with PoDoFo output , I have observed that there is small discrepancy ,which is especially significant for large fonts with large line gap values. The fix is to keep half linegap on top also. Current behavior : BaseLine= Top-Ascent Improved behaviour : BaseLine = Top -Ascent -LineGap/2 After this podofo matches very well with other application It is not possible for me to generate a unified diff against latest revision now I have attached the relevant function I have also attached a diff against revision 1767. This has both above mentioned fix, and improvement to GetMultiLineTextAsLines as function also( This was sent before also but not yet committed). Regards Ali ::DISCLAIMER:: ---------------------------------------------------------------------------------------------------------------------------------------------------- The contents of this e-mail and any attachment(s) are confidential and intended for the named recipient(s) only. E-mail transmission is not guaranteed to be secure or error-free as information could be intercepted, corrupted, lost, destroyed, arrive late or incomplete, or may contain viruses in transmission. The e mail and its contents (with or without referred errors) shall therefore not attach any liability on the originator or HCL or its affiliates. Views or opinions, if any, presented in this email are solely those of the author and may not necessarily reflect the views or opinions of HCL or its affiliates. Any form of reproduction, dissemination, copying, disclosure, modification, distribution and / or publication of this message without the prior written consent of authorized representative of HCL is strictly prohibited. If you have received this email in error please delete it and notify the sender immediately. Before opening any email and/or attachments, please check them for viruses and other defects. ----------------------------------------------------------------------------------------------------------------------------------------------------
void PdfPainter::DrawMultiLineText( double dX, double dY, double dWidth, double
dHeight, const PdfString & rsText,
EPdfAlignment eAlignment,
EPdfVerticalAlignment eVertical, bool bClip )
{
PODOFO_RAISE_LOGIC_IF( !m_pCanvas, "Call SetPage() first before doing
drawing operations." );
if( !m_pFont || !m_pPage || !rsText.IsValid() )
{
PODOFO_RAISE_ERROR( ePdfError_InvalidHandle );
}
// Peter Petrov 25 September 2008
//m_pFont->EmbedFont();
if( dWidth <= 0.0 || dHeight <= 0.0 ) // nonsense arguments
return;
this->Save();
if( bClip )
{
this->SetClipRect( dX, dY, dWidth, dHeight );
}
PdfString sString = this->ExpandTabs( rsText,
rsText.GetCharacterLength() );
std::vector<PdfString> vecLines = GetMultiLineTextAsLines(dWidth,
sString);
double dLineGap = m_pFont->GetFontMetrics()->GetLineSpacing() -
m_pFont->GetFontMetrics()->GetAscent() +
m_pFont->GetFontMetrics()->GetDescent();
// Do vertical alignment
switch( eVertical )
{
default:
case ePdfVerticalAlignment_Top:
dY += dHeight; break;
case ePdfVerticalAlignment_Bottom:
dY += m_pFont->GetFontMetrics()->GetLineSpacing() *
vecLines.size(); break;
case ePdfVerticalAlignment_Center:
dY += (dHeight -
((dHeight - (m_pFont->GetFontMetrics()->GetLineSpacing() *
vecLines.size()))/2.0));
break;
}
dY -= (m_pFont->GetFontMetrics()->GetAscent() + dLineGap / (2.0));
std::vector<PdfString>::const_iterator it = vecLines.begin();
while( it != vecLines.end() )
{
if( (*it).GetCharacterLength() )
this->DrawTextAligned( dX, dY, dWidth, *it, eAlignment );
dY -= m_pFont->GetFontMetrics()->GetLineSpacing();
++it;
}
this->Restore();
}
PdfPainter.diff
Description: PdfPainter.diff
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