Angus Leeming <[EMAIL PROTECTED]> writes: > > Enrico Forestieri wrote: > > Perhaps you mean that the dpi variable is *proportional* to > > preview_scale_factor. Indeed, when not setting preview_scale_factor I > > obtain dpi=112, whereas setting it to 1.02 I obtain dpi=127. However, I > > don't know the default value of preview_scale_factor (and obviously it is > > not equal to 1), so I am not able to evaluate preview_scale_factor from > > the knowledge of dpi. > > 0.9
Uhm... this value is doesn't look right to me. Perhaps it was ok in the old xforms days, but anyway... > In src/graphics/PreviewLoader.C you'll find: > > font_scaling_factor_ = 0.01 * lyxrc.dpi * lyxrc.zoom * > convert<double>(lyxrc.preview_scale_factor); > > ... > > cs << pconverter_->command << ' ' << pconverter_->to << ' ' > << support::QuoteName(latexfile) << ' ' > << int(font_scaling_factor_) << ' ' > << lyx_gui::hexname(LColor::preview) << ' ' > << lyx_gui::hexname(LColor::background); > > This is the command used to launch the script. 'dpi' inside the script is > 'int(font_scaling_factor_) outside it. > > Thereafter, the metrics info is used in setAscentFractions() in the same > file. Thanks for the pointer Angus, but, perhaps due to the fact that I don't grok well C++, I was not able to figure out the program flow and eventually I came to the conclusion that there was any, as everything seems to be signal driven :-( However, I did some experiments using the lyx file pasted at the bottom. In my preference file I have \screen_zoom 130 \screen_font_roman "Times New Roman" and the "Screen DPI" is at its default value of 96. Using the default value of 0.9 for preview_scale_factor, the various "n"'s and "H"'s are not aligned with each other. Then I changed preview_scale_factor with a step of 0.05, successively trying the values 0.95, 1.0, 1.05. At preview_scale_factor=1.05, magically everything lines up and even the baseline of the previewed images is correctly aligned with the baseline of the surrounding text! With these settings I tried other real world lyx files and everything seems fine. Things break again if one chooses pslatex fonts. Instead, changing \screen_zoom to 150, the "n"'s and "H"'s are still aligned with each other but their baseline does not correspond anymore to that of the surrounding text. I think that the conclusion is that there are complex interactions between too much parameters and it is very difficult to get it right. I am sorry that my scarce knowledge of C++ and of the LyX sources does not let me to be of help here, and, frankly, I don't know how much this effort would be worth. > > As regards why we need to use it twice, I don't know the way the images > > are imported. What I know is that if leave untouched the value of the > > frac variable *and* preview_scale_factor is set to something different > > than its default value, then the inlined images do not perfectly line up > > with the surrounding text. > > Right. But you'll understand that I'm unhappy about making a change I don't > understand. You're a wise man ;-) -- Enrico #LyX 1.4.0pre3 created this file. For more info see http://www.lyx.org/ \lyxformat 245 \begin_document \begin_header \textclass article \language english \inputencoding auto \fontscheme default \graphics default \paperfontsize default \spacing single \papersize default \use_geometry false \use_amsmath 1 \cite_engine basic \use_bibtopic false \paperorientation portrait \secnumdepth 3 \tocdepth 3 \paragraph_separation indent \defskip medskip \quotes_language english \papercolumns 1 \papersides 1 \paperpagestyle default \tracking_changes false \output_changes false \end_header \begin_body \begin_layout Standard \family roman \series medium \shape up \size normal \emph off \bar no \noun off \color none xxxx \begin_inset Formula $n$ \end_inset xxx \family default \series default \shape default \size default \emph default \bar default \noun default \begin_inset Formula $n_{i}$ \end_inset xxx \begin_inset Formula $n^{2}$ \end_inset xxx \begin_inset Formula $n_{i}^{2}$ \end_inset xxx \begin_inset Formula $H$ \end_inset xxx \begin_inset Formula $H_{1}$ \end_inset xxx \begin_inset Formula $H^{2}$ \end_inset xxx \begin_inset Formula $H_{i}^{2}$ \end_inset xxx \end_layout \end_body \end_document
