Hello LuaMetaFun Fans,
Can I use mp.inject.path in Lua to create a disconnected path in MetaPost?
This is for my module that draws globes. I currently do something like this for
drawing the continents. (This MWE has two triangular continents.)
\startluacode
continents = {}
continents[1] = {{0,0}, {-1,-1}, {-1,0}, cycle = true }
continents[2] = {{0,1}, {1,0}, {1,-1}, cycle = true }
function mp.getglobepath(continentnum)
mp.inject.path(continents[continentnum])
end
\stopluacode
\startMPpage
path p[], q ;
p1 = (lua.mp.getglobepath(1) scaled 1cm) ;
p2 = (lua.mp.getglobepath(2) scaled 1cm) ;
q = p1 && p2 && cycle ;
draw p1 withpen pencircle scaled 2pt withcolor .7 ;
draw p2 withpen pencircle scaled 2pt withcolor .7 ;
fill q withcolor 0.9 ;
draw q withcolor red ;
\stopMPpage
The path q has both of the continents, disconnected.
I’d like to produce the two continents in Lua and pass them to MetaPost as a
single disconnected path, using something like this:
\startluacode
continents = {
{0,0}, {-1,-1}, {-1,0}, — Change this to make a disconnected path!
{0,1}, {1,0}, {1,-1},
cycle = true }
function mp.getglobepath()
mp.inject.path(continents)
end
\stopluacode
\startMPpage
path p ;
p = (lua.mp.getglobepath() scaled 1cm) ;
fill p withcolor 0.9 ;
draw p withcolor red ;
\stopMPpage
If I can make the path p disconnected, this would allow me to make exactly the
path I want in Lua, before passing it to MetaPost, rather than passing lots of
paths and connecting them in MetaPost with the mysterious (to me) && or &&&&.
Thanks!
Gavin
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