Problems with Rendering justified text
Added by Helmar Spangenberg almost 11 years ago
I'm using WPdfRenderer (3.3.1) to create justified text. There are 2 problems:
a) The text is not expanded totally to the right side, the lines do not end exactly at the same position.
b) Every once in a while you can find a line displaying the last word in a bigger distance to the rest of the line
I was able to patch Wt for my application to get rid of problem b):
In line 1057 of Block.C a part of the text is chosen to fit into maxWidth. Some lines later, an additional lenght of whitespaceWidth might be added under some circumstances. The consequence is, a text fragment, which seemed to fit into the line, may be extended to just not fitting anymore in special cases. I observed lines with two blocks leading to the b9-Problem.
My solution for this particular problem was to decrease maxWidth by whitespaceWidth, thus avoiding situations as described. I changed the original line 1057
_= renderer.painter()device()>measureText(text, maxWidth, true);_
by
_= renderer.painter()device()>measureText(text, maxWidth-whitespaceWidth, true);_
My question: Could any other functionality be affected by this change?
With regards to problem a) I have no real idea what could be done. I have the feeling that the calculation of the ratio between text and remaining space seems to be buggy.
Replies (4)
RE: Problems with Rendering justified text - Added by Wim Dumon almost 11 years ago
Hello Helmar,
Can you add the HTML that produces the bad result?
Best regards,
Wim.
RE: Problems with Rendering justified text - Added by Helmar Spangenberg almost 11 years ago
Hello Wim,
the text is the output of tinyMCE - I will add it as a short file.
With best regards,
Helmar
| render.html (1.4 KB) render.html |
RE: Problems with Rendering justified text - Added by Helmar Spangenberg almost 11 years ago
Ah - maybe I should add my page parameters I submitted to hpdf/WPdfRenderer:
page = HPDF_AddPage(hpdf);
HPDF_Page_SetSize(page, HPDF_PAGE_SIZE_A4, HPDF_PAGE_PORTRAIT);
renderer = new Render::WPdfRenderer(hpdf, page);
dev = renderer->startPage(0);
double faktorX = renderer->pageWidth(0)/210.; // DIN A4 hat als Breite 210 mm
double faktorY = renderer->pageHeight(0)/297.; // DIN A4 hat als Höhe 297 mm
renderer->setMargin(2.0,Left|Right);
renderer->setFontScale(0.75);