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New! First section: measures
< [[Using–Graphics]] >
If you’re using ConTeXt for complex layout tasks, you need to calculate with image sizes. Often it makes sense to use Lua functions.
== Measures in pure ConTeXt ==
Beware, TeX calculates internally in "scaled points" (sp), 1 sp = 1/65536 pt.
<texcode>
\setupexternalfigures[location=default]
\getfiguredimensions[hacker.jpg]
% defines a bunch of variables, e.g.:
\figurefullname
\figurefilepath
\figurefilename
\figurefiletype
</texcode>
<context>
\setupexternalfigures[location=default]
\getfiguredimensions[hacker.jpg]
\starttabulate[|T|l|]
\NC \string\figurewidth \NC \figurewidth \NC \NR
\NC \string\figureheight \NC \figureheight \NC \NR
\NC \string\figurexscale \NC \figurexscale \NC \NR
\NC \string\figureyscale \NC \figureyscale \NC \NR
\TB
\NC \string\figuresize \NC \figuresize \NC\NR
\NC \string\figurelabel \NC \figurelabel \NC\NR
\NC \string\figurefileoriginal \NC \figurefileoriginal \NC\NR
\NC \string\figurefilepage \NC \figurefilepage \NC\NR
\NC \string\figurefileoptions \NC \figurefileoptions \NC\NR
\NC \string\figurefileconversion\NC \figurefileconversion\NC\NR
%\NC \string\figurefileresolution\NC \figurefileresolution\NC\NR
%\NC \string\figurefilecolor \NC \figurefilecolor \NC\NR
%\NC \string\figurefilearguments \NC \figurefilearguments \NC\NR
\NC \string\figurefilecache \NC \figurefilecache \NC\NR
\NC \string\figurefileprefix \NC \figurefileprefix \NC\NR
\TB
\NC \string\figurenaturalwidth \NC \figurenaturalwidth \NC\NR
\NC \string\figurenaturalheight \NC \figurenaturalheight \NC\NR
\NC \string\figurexresolution \NC \figurexresolution ~dpi \NC\NR
\NC \string\figureyresolution \NC \figureyresolution ~dpi \NC\NR
%\NC \string\figureorientation \NC \figureorientation \NC\NR
%\NC \string\figurerotation \NC \figurerotation \NC\NR
\NC \string\figurexsize \NC \figurexsize \NC\NR
\NC \string\figureysize \NC \figureysize \NC\NR
\NC \string\figurecolordepth \NC \figurecolordepth \NC\NR
\NC \string\figuredepth \NC \figuredepth \NC\NR
\TB
\NC \string\figurefullname \NC \figurefullname \NC\NR
\NC \string\noffigurepages \NC \noffigurepages ~pages \NC\NR
\TB
\NC \string\figurefilepath \NC \figurefilepath \NC\NR
\NC \string\figurefilename \NC \figurefilename \NC\NR
\NC \string\figurefiletype \NC \figurefiletype \NC\NR
\stoptabulate
</context>
If you’re using ConTeXt for complex layout tasks, you need to calculate with image sizes. Often it makes sense to use Lua functions.
== Measures in pure ConTeXt ==
Beware, TeX calculates internally in "scaled points" (sp), 1 sp = 1/65536 pt.
<texcode>
\setupexternalfigures[location=default]
\getfiguredimensions[hacker.jpg]
% defines a bunch of variables, e.g.:
\figurefullname
\figurefilepath
\figurefilename
\figurefiletype
</texcode>
<context>
\setupexternalfigures[location=default]
\getfiguredimensions[hacker.jpg]
\starttabulate[|T|l|]
\NC \string\figurewidth \NC \figurewidth \NC \NR
\NC \string\figureheight \NC \figureheight \NC \NR
\NC \string\figurexscale \NC \figurexscale \NC \NR
\NC \string\figureyscale \NC \figureyscale \NC \NR
\TB
\NC \string\figuresize \NC \figuresize \NC\NR
\NC \string\figurelabel \NC \figurelabel \NC\NR
\NC \string\figurefileoriginal \NC \figurefileoriginal \NC\NR
\NC \string\figurefilepage \NC \figurefilepage \NC\NR
\NC \string\figurefileoptions \NC \figurefileoptions \NC\NR
\NC \string\figurefileconversion\NC \figurefileconversion\NC\NR
%\NC \string\figurefileresolution\NC \figurefileresolution\NC\NR
%\NC \string\figurefilecolor \NC \figurefilecolor \NC\NR
%\NC \string\figurefilearguments \NC \figurefilearguments \NC\NR
\NC \string\figurefilecache \NC \figurefilecache \NC\NR
\NC \string\figurefileprefix \NC \figurefileprefix \NC\NR
\TB
\NC \string\figurenaturalwidth \NC \figurenaturalwidth \NC\NR
\NC \string\figurenaturalheight \NC \figurenaturalheight \NC\NR
\NC \string\figurexresolution \NC \figurexresolution ~dpi \NC\NR
\NC \string\figureyresolution \NC \figureyresolution ~dpi \NC\NR
%\NC \string\figureorientation \NC \figureorientation \NC\NR
%\NC \string\figurerotation \NC \figurerotation \NC\NR
\NC \string\figurexsize \NC \figurexsize \NC\NR
\NC \string\figureysize \NC \figureysize \NC\NR
\NC \string\figurecolordepth \NC \figurecolordepth \NC\NR
\NC \string\figuredepth \NC \figuredepth \NC\NR
\TB
\NC \string\figurefullname \NC \figurefullname \NC\NR
\NC \string\noffigurepages \NC \noffigurepages ~pages \NC\NR
\TB
\NC \string\figurefilepath \NC \figurefilepath \NC\NR
\NC \string\figurefilename \NC \figurefilename \NC\NR
\NC \string\figurefiletype \NC \figurefiletype \NC\NR
\stoptabulate
</context>
