graphics.hlp (
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_getgtextextent
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The _getgtextextent function returns the width, in pixels, that
would be required to print the text string using _outgtext with
the current font.
This function is particularly useful for determining the size of
text that uses proportionally spaced fonts.
Return Value
The _getgtextextent function returns the width in pixels. It
returns -1 if a font has not been registered.
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