iso-drawGrid.lua

-- draw a tile map to the screen
-- populate the tile map
function drawGrid()
   for row = 0, 5 do
      local gridRow = {}
      
      for col = 0, 5 do
        -- draw a diamond shaped tile
        local vertices = { 0,-16, -64,16, 0,48, 64,16 }
        local tile = display.newPolygon(group, 0, 0, vertices )

        -- outline the tile and make it transparent
	tile.strokeWidth = 1
	tile:setStrokeColor( 0, 1, 1 )
        tile.alpha = .25

        -- set the tile's x and y coordinates
        local x = col * tileHeight
        local y = row * tileHeight

        tile.x = x - y
        -- the first part of this equation is to move the y coordinate down 32 pixels (tileHeight/2)
        tile.y = (tileHeight/2) + ((x + y)/2) 
        
        -- make a tile walkable
        gridRow[col] = 0
      end
      -- add gridRow table to the map table
      map[row] = gridRow
   end
end