The bbox method
returns a list containing four items that describe the box around the
character at index:
($x, $y, $w, $h) = $text->bbox(index);
The first two items returned are the x and
y coordinates of the upper-left corner. The last two are the width
and height of the box. The bounding box describes only the visible
portion of the character, so if it is half hidden or not visible at
all, the values returned will reflect this.
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