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stipub / stixfonts

OpenType Unicode fonts for Scientific, Technical, and Mathematical texts
SIL Open Font License 1.1
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Inconsistent stroke contrast patterns in nabla glyphs #216

Open tiroj opened 3 years ago

tiroj commented 3 years ago

As reported by @PaulHanslow

I found the increment symbol (or nabla) to be odd when switching styles. In upright it has a strong left side stroke with the top and right being thin, while the italic form has a thick top and left side. I wondered if the mapping of this glyph is incorrect, as the italic form seems to match the Greek stroke contrast, while the upright form matches the Latin. The regular nabla (/2207) should have a heavier top bar, like it does in the bold (u1D6C1), italic (u1D6FB) and bold italic (/1D735).

image

tiroj commented 3 years ago

The regular upright increment symbol (U+2206) and nabla (U+2207) are as inherited from the old STIX fonts; the other nable gltpgs are based on rotated Delta glyphs from the new Greek design.

@davidmjones I propose to replace the old upright increment and nabla signs with a new glyph based on the new Delta (and also add updated ssty variants).

tiroj commented 3 years ago

Replaced in dev for 2.20

tiroj commented 2 years ago

Updated sources and fonts delivered to STI Pub for testing. Issue reopened pending public release.