Re: $n\choose k$-issue with OpenType math fonts

[Andreas Harder <andreas.harder@rz-online.de>]

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Am 06.03.2011 um 15:33 schrieb Hans Hagen:

> On 6-3-2011 1:22, Andreas Harder wrote:
> 
>> I don't know the best value either, but et least one could manipulate it.
> 
> the next beta will support parameter overload in the goodies
> 
>        parameters = { -- test values
>            FactorA = 123.456,
>            FactorB = false,
>            FactorC = function(value,target,original) return 7.89 * target.factor end,
>            FactorD = "Hi There!",
>        },

I'm afraid, I don't get it. Here is what I tried:
I copied all stack-relevant values from asana-math.tma and put them in the return section of the goodies file (like showed in lm-math.lfg). But even if I set all values to zero, the output remains the same. Im I doing something wrong? 


[-- Attachment #2: asana-math.lfg --]
[-- Type: application/octet-stream, Size: 1240 bytes --]

-- This patch code is moved from font-pat.lua to this goodies
-- files as it does not belomg in the core code.

local patches = fonts.otf.enhancers.patches

local function patch(data,filename,threshold)
    local m = data.metadata.math
    if m then
        local d = m.DisplayOperatorMinHeight or 0
        if d < threshold then
            patches.report("DisplayOperatorMinHeight(%s -> %s)",d,threshold)
            m.DisplayOperatorMinHeight = threshold
        end
    end
end

patches.register("after","check math parameters","asana",function(data,filename) patch(data,filename,1350) end)

return {
   name = "lm-asana",
   version = "1.00",
   comment = "Goodies that complement asana.",
   author = "Hans Hagen",
   copyright = "ConTeXt development team",
   parameters = { -- test values
      -- data = {
	 metadata = {
	    math = {
	       StackBottomDisplayStyleShiftDown = 0,
	       StackBottomShiftDown = 0,
	       StackDisplayStyleGapMin = 0,
	       StackGapMin = 0,
	       StackTopDisplayStyleShiftUp = 0,
	       StackTopShiftUp = 0,
	       StretchStackBottomShiftDown = 0,
	       StretchStackGapAboveMin = 0,
	       StretchStackGapBelowMin = 0,
	       StretchStackTopShiftUp = 0,
	    },
	 },
      -- },
   },
}

[-- Attachment #3: test-goodies.tex --]
[-- Type: application/octet-stream, Size: 254 bytes --]


\usetypescript[palatino,asana]
\startTEXpage[offset=1pt]
  \ruledhbox
    {% \switchtobodyfont[palatino]  $\binom{n}{k}$
     \switchtobodyfont[asana]     $\binom{n}{k}$}
\stopTEXpage

%%% Local Variables: 
%%% mode: context
%%% TeX-master: t
%%% End: 

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Greeting
	Andreas

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