[css-values-4] Clean up trig function definitions #3761
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The only normative change is that `atan2()` is changed to support values with dimensions (so long as both dimensions are the same). I don't see any implementation reason not to allow it; they type checking rules are the same as `hypot` (except that the types cancel out, so don't affect the final type of the function). Most other corrections should be obvious in the diff. I changed the note about atan2 because it used terminology based on a y-axis-up coordinate system and CSS/SVG uses a y-axis-down system. I changed the notes about simplifying at computed value time to refer to _calculations_ instead of _math functions_, because some complex nested functions cannot be simplified early. (E.g., `hypot(100%, 5em)` can't be simplified until percentages can be turned into lengths.) **Edits still required:** The [Syntax](https://drafts.csswg.org/css-values/#calc-syntax) and [Serialization](https://drafts.csswg.org/css-values/#calc-serialize) sections should probably include entries for the new functions. But I wasn't sure how that should look.
tabatkins
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Mar 26, 2019
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Thanks for the fixes! |
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Related to #2331 and commit b8935e7
The only normative change (from Tab's commit) is that
atan2()is changed to support values with dimensions (so long as both dimensions are the same).
I don't see any implementation reason not to allow it;
they type checking rules are the same as
hypot(except that the types cancel out, so don't affect the final type of the function).
Most other corrections should be obvious in the diff.
I changed the note about atan2 because it used terminology
based on a y-axis-up coordinate system
and CSS/SVG uses a y-axis-down system.
I changed the notes about simplifying at computed value time
to refer to calculations instead of math functions,
because some complex nested functions cannot be simplified early.
(E.g.,
hypot(100%, 5em)can't be simplified until percentages can be turned into lengths.)Edits still required:
The Syntax and Serialization sections should probably include entries for the new functions. But I wasn't sure how that should look.
PS, Thanks for the main commit @tabatkins! I'd said I'd give it a go, but who knows when I would have got to it.
(And I probably would have just linked to ECMAScript for all the stuff to do with infinities and NaN.)