Finding text's bounding rect in Core Text
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by Mo
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Published on 2010-05-05T02:25:11Z
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2010/05/05
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I'm trying to find the boundaries of a line of text in Core Text. For simplicity, assume it has a single character. At the moment I'm using the following method:
line = CTLineCreateWithAttributedString(attrString);
rect = CTLineGetImageBounds(line, context);
It works most of the times, but for some characters, like math italic d (Unicode: 0x1D451) or math italic q (Unicode: 0x1D45E), the width is a bit short.
I tried using CTLineGetTypographicBounds() or CTFramesetterSuggestFrameSizeWithConstraints, but they didn't help either (I think they use glyph's advance to find the width, not its graphical width.) As the font itself isn't italic, I also can't use slant angle to correct this.
I tried accessing the glyphs directly and using CTFontCreatePathForGlyph(), but failed as CGGlyph and UniChar are both 16-bits and I need 32-bit characters.
Does anyone know if I'm doing anything wrong? If so, what's the right way?
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