On Tuesday 16 July 2002 5:53 pm, David Kastrup wrote: > The snippet info outputs the exact dimensions of the TeX box. The > tightpage option adds additional side bearings to that in order to > arrive at the PostScript page size so as not to cut off anything that > might slightly protrude out of the TeX box. So the total size of the > graphics is larger by those side bearings, and the ascent ratio is > also slightly influenced by it. Probably not more than very few > pixels at most, if at all. > > If I call the tp numbers tp1, tp2, tp3, tp4, and the snippet values > ht, dp, wd, then we have, strictly speaking, > > ascent = max(0,ht,-dp)+tp4 > descent = max(0,-ht,dp)-tp2 > > The tightpage dimensions can be modified by the user; in that case, > before the next snippet, the changed values will be printed out in a > new Tightpage line (the separate prlyx.def that you have had in your > hands before printed out the tightpage info itself, and just once at > the start of the document. Which should not make a difference, as I > don't think anybody ever fiddled with those settings, least of all in > mid-document).
Thanks for the clear explanation. I'll modify the shell script so: grep -E 'Preview: [S-T]' 1lyxpreview.log > 1lyxpreview.metrics and use this .metrics file to perform the calculation within LyX. cat 1lyxpreview.metrics Preview: Tightpage -32890 -32890 32890 32890 Preview: Snippet 1 492688 0 744653 Preview: Snippet 2 1441792 163840 16026923 Preview: Snippet 3 282168 0 377591 Preview: Snippet 4 1619363 449545 16026923 If the Tightpage changes, then Ihat will be accommodated automatically. Angus
