The strange thing is that there only seem to be 3 baseline positions supported by NSTextField; any positive value, 0, and any negative value.
I assume you've seen this, from http://developer.apple.com/documentation/Cocoa/Conceptual/AttributedStrings/Articles/standardAttributes.html#/ /apple_ref/doc/uid/TP40004903
"The superscript attribute indicates an abstract level for both super- and subscripts. The user of the attributed string can interpret this as desired, adjusting the baseline by the same or a different amount for each level, changing the font size, or both."
Are you perhaps setting a baseline attribute _and_ a superscript attribute? It sounds like the Cocoa text system is adjusting the baseline according to its notion of superscripts and ignoring your baseline attribute value.
Personally, I don't think NSSuperscriptAttributeName is particularly useful. I just adjust the baseline and font size: newFontSize = oldFontSize * 0.75, baseline for superscript += 0.4 * oldFontSize, baseline for subscript -= 0.3 * oldFontSize.
If the only thing you need to draw is a superscript 2, I like Andrew's solution.
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