posted on 09:11 PM on Tuesday 22 August 2023
Since I use ggplot2 on a regular basis to generate plots which the number of axis elements is often variable. I often need to determine the space taken by the axis labels.
So it appears that the default for ggplot2 is helvetica 9 points for the axis labels. I generate a PDF plot using
theme_bw() and then open the plot in Affinity Designer to check and it was helvetica 9 points.
Now that I know the font and size, checking the following link gives me the average width of a character in Helvetica as being 0.53772 of its height.
Therefore a character in 9 points will take up
9 / 72 of an inch while the width would be
0.53772 * 9 / 72. So using this values together with the max number of characters in the axis labels, I can determine the width and height of the axis labels.
On a side note, a point which is a measurement used for font is basically
1/72 inches. See: