An arbitrary string for which the width is to be
calculated. May contain LaTeX markup.
cex
a real number that specifies a scaling factor that is to be
applied to device output.
face
an integer in the range [1-5] that specifies the font face to
use. See par for details.
engine
a string specifying which TeX engine to use. Possible values
are 'pdftex', 'xetex' and 'luatex'. See the Unicode section of tikzDevice for
details.
documentDeclaration
See the sections “Options That Affect Package
Behavior” and “Font Size Calculations” of tikzDevice-package
for more details.
packages
See the section “Options That Affect Package Behavior” of
tikzDevice-package.
verbose
A logical value indicating whether diagnostic messages are
printed when measuring dimensions of strings. Defaults to TRUE in
interactive mode only, to FALSE otherwise.
charCode
an integer that corresponds to a symbol in the ASCII
character table under the Type 1 font encoding. All numeric values are
coerced using as.integer. Non-numeric values will not be accepted.
Details
These functions are used internally by the tikz device for proper
string placement in graphics. Both functions check to see if metrics exist
in a global or temporary dictionary (as defined in
options('tikzMetricsDictionary')) and if so will pull the metrics
from there. If the dictionary does not exist, then a temporary one is
created for the current R session. Metrics are calculated via system
calls to LaTeX compilers. Querying compilers to calculate metrics is
expensive and so we strongly recommend setting
options('tikzMetricsDictionary') <- '/path/to/dictionary' to create a
global dictionary.
Value
getLatexStrWidth
The width of texString in points.
getLatexCharMetrics
A numeric vector holding ascent, descent
and width. Values should all be nonnegative.