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Diffstat (limited to 'pbmtextps.html')
| -rw-r--r-- | pbmtextps.html | 21 |
1 files changed, 16 insertions, 5 deletions
diff --git a/pbmtextps.html b/pbmtextps.html index 7cc77c8a..f64124a7 100644 --- a/pbmtextps.html +++ b/pbmtextps.html @@ -2,7 +2,7 @@ <html><head><title>Pbmtextps User Manual</title></head> <body> <h1>pbmtextps</h1> -Updated: 15 June 2016 +Updated: 04 June 2022 <br> <a href="#index">Table Of Contents</a> @@ -63,9 +63,10 @@ to reach a specified distance below the text baseline. <p><b>-ascent</b> and <b>-descent</b> are more useful than <b>-topmargin</b> and <b>-bottomargin</b> when you render two pieces of text (in separate invocations of <b>pbmtextps</b>) that you will concatenate horizontally. -With <b>-ascent</b> and <b>-descent</b>, the two images will be the same -height with the text baseline in the same place. With <b>-topmargin</b> -and <b>-bottommargin</b>, that may not be the case. +With <b>-ascent</b> and <b>-descent</b>, as long as you specify a value +greater than the height or detph of every character in the font, the two +images will be the same height with the text baseline in the same place. +With <b>-topmargin</b> and <b>-bottommargin</b>, that may not be the case. <p>Example: @@ -74,10 +75,20 @@ and <b>-bottommargin</b>, that may not be the case. $ pbmtextps -font=Times-Roman -descent=20 \ "The soup is called" > a1.pbm $ pbmtextps -font=Itallic -descent=20 "Goulash." > a2.pbm - $ pnmcat -lr -jb a1.pbm a2.pbm > out.pbm + $ pnmcat -leftright -jbottom a1.pbm a2.pbm > out.pbm </kbd> </pre> +<p>If you're using <b>-descent</b> to line up the segments of text you are + concatenating horizontally with <b>pnmcat</b>, use the <b>-jbottom</b> + (justify to bottom) option on <b>pnmcat</b> as in the example above. If you + use <b>-ascent</b>, use <b>-jtop</b> instead. + +<p>Similarly, if you render two lines of text (in separate invocations of + <b>pbmtextps</b>) that you will concatenate vertically, <b>-ascent</b> and + <b>-descent</b> with sufficiently large values will ensure your baselines + are uniformly spaced. + <p>If you have <b>-ascent</b>, there is probably no point in specifying <b>-topmargin</b> too, but if you do, the effect is cumulative. The same is true of <b>-descent</b> and <b>-bottommargin</b>. |