On Wed, Jun 7, 2017 at 7:31 PM, Hans Hagen <pra...@wxs.nl> wrote:
> On 6/7/2017 4:50 PM, Mikael P. Sundqvist wrote:
>>
>> On Mon, Jun 5, 2017 at 10:24 AM, Mikael P. Sundqvist <mic...@gmail.com>
>> wrote:
>>>
>>> Hi,
>>>
>>> this might be a matter of taste.
>>>
>>> look at the output of (attached). In my opinion the first square root
>>> is to "high", while it looks better on the second line. From
>>> setup-en.pdf it looks like the default of \setupmathradical is set to
>>> normal (and not default). I don't understand what normal should mean,
>>> but I think the alternative=default looks better. (The lucida fonts
>>> are loaded in this example, since the effect is more clear for them).
>
> Ok, this is the story
>
> -- radicals (roots) are rather special and have some hard coded properties
> (like always scriptscript in the degree)
>
> -- \over (and friends) that are used in \frac (which by the way can be
> configured in many ways) has the danger of getting the wrong style as side
> effect of parsing (math list construction) and processing
>
> -- in context we want to support color etc for noth in a consistent way as
> well as style control (important in educational math)
>
> Normally it works out ok with the 'normal' setting but there is some catch
> here. The size of the radical symbols is determine by
>
> -- RadicalVerticalGap = 50
> -- RadicalDisplayStyleVerticalGap = 175
>
> (These are lucide values) and it happens that the second one if too large
> which can give a bad threshold in our case. In cambria it's
>
> RadicalVerticalGap = 166
> RadicalDisplayStyleVerticalGap = 345
>
> So a 1:2 ratio. If we use that for lucida it looks better, so
>
> lucida-opentype-math.lfg
>
> can become:
>
> local function FixRadicalDisplayStyleVerticalGap(value,target,original)
> local o = original.mathparameters.RadicalVerticalGap -- 50
> return 2 * o * target.parameters.factor
> end
>
> return {
> name = "lucida-opentype-math",
> version = "1.00",
> comment = "Goodies that complement lucida opentype.",
> author = "Hans Hagen",
> copyright = "ConTeXt development team",
> mathematics = {
> parameters = {
> RadicalDisplayStyleVerticalGap =
> FixRadicalDisplayStyleVerticalGap,
> },
> alternates = {
> italic = { feature = 'ss01', value = 1, comment =
> "Mathematical Alternative Lowercase Italic" },
> arrow = { feature = 'ss02', value = 1, comment =
> "Mathematical Alternative Smaller Arrows" },
> operator = { feature = 'ss03', value = 1, comment =
> "Mathematical Alternative Smaller Operators" },
> calligraphic = { feature = 'ss04', value = 1, comment =
> "Mathematical Alternative Calligraphic Characters" },
> zero = { feature = 'ss05', value = 1, comment =
> "Mathematical Alternative Zero" },
> partial = { feature = 'ss20', value = 1, comment =
> "Mathematical Alternative Upright Partial Differential" },
> },
> },
> }
>
> It's sort of a font property: the more sizes the better and sometimes you're
> simply hit by the threshold not suiting your case.
>
>
> Hans
>
> -----------------------------------------------------------------
> Hans Hagen | PRAGMA ADE
> Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
> tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl
> -----------------------------------------------------------------
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Hans,
many thanks for your explanation, it is really appreciated when you
take your time to do this!
I updated my local lucida-opentype-math.lfg and indeed it works like
charm. I think the uncramped version I get now looks better than what
I forced with the temporary solution that I did not understand.
/Mikael
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