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Learning Perl/Tk by Nancy Walsh

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16.7. Converting Screen Distances

If you prefer to use inches as a screen distance but you want to print out pixels, you can use the pixels method to convert any valid screen distance string into a pixel value; for example:

$pixels = $widget->pixels("2i");    # What is 2 inches in pixels?
$pixels = $widget->pixels("2m");    # What is 2 millimeters in pixels?

The pixelsmethod rounds to the nearest whole pixel. You can get a fractional pixel result by using fpixels:

$pixels = $widget->fpixels("2i");    # What is 2 inches in pixels?
$pixels = $widget->fpixels("2m");    # What is 2 millimeters in pixels?

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