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Estimate bounding box of a rotated string
bbox(txt = "foo", angle = 0, size = 12)
a character string of length 1
sets the angle of the tick labels with respect to the horizontal (e.g., tickangle of -90 draws the tick labels vertically)
tickangle
vertical size of a character
https://www.dropbox.com/s/nc6968prgw8ne4w/bbox.pdf?dl=0