[NTG-context] combination with lua

Hans Hagen j.hagen at xs4all.nl
Tue Oct 12 14:12:29 CEST 2021


On 10/11/2021 1:38 PM, Adam Reviczky via ntg-context wrote:
> Hi,
> 
> I am trying to use a combination figure with luacode (both with latest 
> MKIV and LMTX).
> However, the figures do not line up in the grid of the combination.
> 
> I get the correct result with examples 1 and 2 below, but example 3 
> using lua functions for combination and externalfigure is what I wanted 
> to use in the first place.
> 
> MWE:
> 
> \starttext
> 
> \startluacode
> 
> -- Combination 1
> context.startplacefigure({title = "Figure"})
> context.startcombination({nx = "2", ny = "2"},
> 
> "\\externalfigure[cow][width=50mm]","Caption 1",
> "\\externalfigure[cow][width=50mm]","Caption 2",
> "\\externalfigure[cow][width=50mm]","Caption 3",
> "\\externalfigure[cow][width=50mm]","Caption 4"
> )
> 
> context.stopcombination()
> context.stopplacefigure()
> 
> -- Combination 2
> 
> context.startplacefigure({title = "Figure"})
> context.startcombination({nx = "2", ny = "2"},
> 
> "Picture 1","Caption 1",
> "Picture 2","Caption 2",
> "Picture 3","Caption 3",
> "Picture 4","Caption 4"
> )
> 
> context.stopcombination()
> context.stopplacefigure()
> 
> -- Combination 3
> 
> context.startplacefigure({title = "Figure"})
> context.startcombination({nx = "2", ny = "2"},
> 
> context.externalfigure({"cow"},{width = "50mm"}),"Caption 1",
> context.externalfigure({"cow"},{width = "50mm"}),"Caption 2",
> context.externalfigure({"cow"},{width = "50mm"}),"Caption 3",
> context.externalfigure({"cow"},{width = "50mm"}),"Caption 4"
> )
> 
> context.stopcombination()
> context.stopplacefigure()
> 
> \stopluacode
> \stoptext
> 
> Any hints on what I am doing wrong in example 3?
as in any prodedural language a function as argument gets immediately 
executed so you need to delay:

context.startplacefigure({title = "Figure"})
     context.startcombination({nx = "2", ny = "2"},
         context.delayed.externalfigure({"cow"},{width = "50mm"}), 
"Caption 1",
         context.delayed.externalfigure({"cow"},{width = "50mm"}), 
"Caption 2",
         context.delayed.externalfigure({"cow"},{width = "50mm"}), 
"Caption 3",
         context.delayed.externalfigure({"cow"},{width = "50mm"}), 
"Caption 4"
     )
     context.stopcombination()
context.stopplacefigure()

(this is why encoding complex documents completely in a scrtipt language 
is non trivial and why for instance these template systems are there 
because these accumulate)

Hans

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