corona - Shifting display groups around in a lua table -


i working on camera module game. designing work large amounts of randomly generated data. data in form of 2d chunks. labeled , referenced actual x, y coordinates. each chunk has group attached in order contain images associated it. have group contains chunks on screen ( simple simple attempt @ culling ). when player moves in direction width of chunk, current chunks need shift in table 1 element , new row ( or column ) of chunks needs loaded in edge row ( or column ). problem comes when shifting. getting error says have either removed image group or parent group. problem haven't done this. following code section having issues in ( think whole code large post @ once ):

note: @ end section removal of elements occurs. have marked asterisks.

if( changebottom == true )  = 1, newview.numviewchunksy - 1   j = 1, newview.numviewchunksx    newview.imagechunktable[i][j] = newview.imagechunktable[i + 1][j]   end  end  j = 1, newview.numviewchunksx  local = newview.numviewchunksy  local metax  local metay  if( newview.metaloadingdata.l == true )   if( ( newview.curchunk.x + ( j - 3 )*chunksize ) < newview.curmetachunk.x )    metax = 1   else    metax = 2   end  elseif( newview.metaloadingdata.r == true )   if( ( newview.curchunk.x + ( j - 3 )*chunksize ) > ( newview.curmetachunk.x + metachunksize*chunksize ) )    metax = 2   else    metax = 1   end  else   metax = 1  end  if( newview.metaloadingdata.t == true )   if( ( ( newview.curchunk.y + ( - 2 )*chunksize ) < newview.curmetachunk.y ) )    metay = 1   else    metay = 2   end  elseif( newview.metaloadingdata.b == true )   if( ( newview.curchunk.y + ( - 2 )*chunksize ) >= newview.curmetachunk.y + metachunksize*chunksize )    metay = 2   else    metay = 1   end  else   metay = 1  end  local chunk = newview.metachunktable[metay][metax].chunktable[ ( newview.curchunk.y + ( - 2 )*chunksize )/chunksize - newview.metachunktable[metay][metax].y/chunksize + 1 ][ ( newview.curchunk.x + ( j - 3 )*chunksize )/chunksize - newview.metachunktable[metay][metax].x/chunksize + 1 ]  newview.imagechunktable[newview.numviewchunksy][j].displaygroup:removeself()----------  newview.imagechunktable[newview.numviewchunksy][j] = nil                       *  newview.imagechunktable[newview.numviewchunksy][j] = imagechunk.new( chunk )   * end

edit : exact wording of error getting ( without file paths ) follows:

error: attempt remove object that's been removed stage or parent/ancestor group has been removed.

here line referenced debugger:

newview.imagechunktable[newview.numviewchunksy][j].displaygroup:removeself()

i have marked in code hyphens.

edit 2 : imagechunk module:

local imagechunk = {} local imagechunk_mt = { __index = imagechunk }  function imagechunk.new( infochunk )  local chunksize = 10  local tilesize = 48   local newimagechunk = {   objtable = {},   displaygroup = display.newgroup()         }  = 1, infochunk.numlayers   newimagechunk.objtable[i] = {}   j = 1, infochunk.layer[i].nummembers    newimagechunk.objtable[i][j] = display.newimage( infochunk.layer[i].group[j].kind.."/"..infochunk.layer[i].group[j].subkind..".png", infochunk.layer[i].group[j].x, infochunk.layer[i].group[j].y )    newimagechunk.displaygroup:insert( newimagechunk.objtable[i][j] )   end  end   return setmetatable( newimagechunk, imagechunk_mt ) end  return imagechunk

probably newview.numviewchunksy][j].displaygroup same 2 or more j. depending on when error occurs (if first shift ok second shift fails, example), newview.numviewchunksy][j] = imagechunk.new( chunk ) incorrect: maybe imagechunk.new() returns nil or doesn't return group. update:

based on update, i'm wondering code shows call imagechunk.new other last line. not true each j corresponds different image chunk display group: newview.imagechunktable[i][j] = newview.imagechunktable[i + 1][j], cause of problem.


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