Determining characters per inch and kerning/tracking

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hello,

 

i trying ensure text in text model has minimum number of characters per inch.  able determine glyph widths using getglyphwidth ifontinstance, not account kerning/tracking/etc.  can lead me in right direction obtain whitespace between each character?  or if have other suggestions assuring text in text model adheres minimum number of characters per inch appreciated.

 

thank you!



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