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Mastering Perl/Tk by Nancy Walsh, Stephen Lidie

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Bounding Box

The method bbox returns a list of four elements that describes the bounding box around the text at index:

($x, $y, $w, $h) = $lb->bbox(index);

The four elements are (in order): x, y, w, and h. x and y are the (x, y) coordinates at the upper-lefthand corner of the bounding box. The w is the width of the text in pixels. The h is the height of the text in pixels. These measurements, relative to the Listbox, are shown in Figure 7-6.

Bounding box values around text

Figure 7-6. Bounding box values around text

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