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Re: underlining

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Re: underlining

Subject: Re: underlining
From: Eric Slosser <email@hidden>
Date: Fri, 6 Feb 2009 13:09:49 -0500

The problem I'm really trying to solve occurs in a 'real' app. I'm drawing to a printer port with 300 dpi, and I found that with Arial 10 bold, point size > 39, the underline gets fat enough so its top edge intersects many of the letters, so all those intersections are skipped (not underlined). The net effect is that the underline looks very jagged, discontinuous, serrated, bad. See ftp://v-fx.com/public/underline/underline_bad.pdf .

If I override NSLayoutManager, provide my own [drawUnderlineForGlyphRange:...], and implement it by adding 50 to the baselineOffset before calling [super drawUnderlineForGlyphRange:...], I get the result in ftp://v-fx.com/public/underline/underline_ok.pdf.

So, I have a workaround, just bump the baseline down. But why is that necessary? Is it a symptom of a problem elsewhere? I'd rather treat the disease than the symptom.

Is it time to stop using NSAttributedString / NSTextStorage and go closer to the metal?


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References:  
  >underlining (From: Eric Slosser <email@hidden>)
  >Re: underlining (From: Graham Cox <email@hidden>)




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