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How to pass a table of vertices to b2.PolygonShape:set()? — Gideros Forum
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    How to pass a table of vertices to b2.PolygonShape:set()?

    DrixDrix Member
    edited November 2012 in General questions
    Please, how could I pass a table of vertices, as the following, to b2.PolygonShape:set()?
    local vertices = {-100,20,  160,20,  160,34,  -160,34}
    I tried this:
    local objShape = b2.PolygonShape.new()
objShape:set(table.concat(vertices, ","))
    ...but it doesn't work because the return of table.concat is an string.

    I really really need that, because I import the arrays of vertices from text files. Please, is there any chance to make the set function to accept a table instead?

    Thanks in advance
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    Comments

    • DrixDrix Member
      edited November 2012
      I got it:
      function MyConvertTableToItensSequence(tb, i)
   if tb[i] ~= nil then
      return tb[i], MyConvertTableToItensSequence(tb, i + 1)
   end
end
 
...
 
objShape:set(MyConvertTableToItensSequence(vertices, 1))
      But I should say that passing a table to this kind of function would be more comfortable.
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    • zvardinzvardin Member
      Accepted Answer
      You can use the unpack lua function

      Likes: Drix, atilim

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    • DrixDrix Member
      edited November 2012
      Thanks @zvardin! I did not know that function. Much simpler.
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    • zaniarzaniar Member
      afaik, unpack function is expensive. So, be careful.
      http://www.nightspade.com
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