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doc/filters: drawtext: add example of printing texts on same baseline

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Height of canvas produced by drawtext varies depending on symbols in
text, so add example for printing separate texts aligned horizontally.

Wording suggested by Lou Logan <lou@lrcd.com>

Signed-off-by: Andrey Utkin <andrey.utkin@pb.com>
Signed-off-by: Lou Logan <lou@lrcd.com>
This commit is contained in:
Andrey Utkin 2016-12-14 14:37:47 +00:00 committed by Lou Logan
parent 2d7aadf3d9
commit c4afd4abce
1 changed files with 8 additions and 0 deletions
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doc/filters.texi
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@ -7135,6 +7135,14 @@ FOD=5 # fade out duration
ffplay -f lavfi "color,drawtext=text=TEST:fontsize=50:fontfile=FreeSerif.ttf:fontcolor_expr=ff0000%@{eif\\\\: clip(255*(1*between(t\\, $DS + $FID\\, $DE - $FOD) + ((t - $DS)/$FID)*between(t\\, $DS\\, $DS + $FID) + (-(t - $DE)/$FOD)*between(t\\, $DE - $FOD\\, $DE) )\\, 0\\, 255) \\\\: x\\\\: 2 @}"
@end example
@item
Horizontally align multiple separate texts. Note that @option{max_glyph_a}
and the @option{fontsize} value are included in the @option{y} offset.
@example
drawtext=fontfile=FreeSans.ttf:text=DOG:fontsize=24:x=10:y=20+24-max_glyph_a,
drawtext=fontfile=FreeSans.ttf:text=cow:fontsize=24:x=80:y=20+24-max_glyph_a
@end example
@end itemize
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