[NTG-context] Define color with calculations

Henri Menke henrimenke at gmail.com
Mon Feb 18 05:02:32 CET 2019


Use Lua.


\def\eval#1{\ctxlua{%
    local context = context
    local _ENV = math
    context(#1)
}}

\definecolor[mycolor][r=\eval{0.5*0.7}]

\starttext

\color[mycolor]{Hello!}

\stoptext



On 18/02/19 4:37 PM, Mohammad Hossein Bateni wrote:
> Hi,
> 
> When I use definecolor, (how) can I use computations in setting the value
> of a component?  Something like the following...
> 
> \definecolor[mycolor][r=0.5*0.7]
> 
> Thanks,
> ~MHB
> 
> 
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