function onPreviewInit()

onGameInit()

end

function onGameInit()

    MapGen = mgDrawn

    TemplateFilter = 0

    local step = 80 + 10 * MapFeatureSize

    local width = 1 + div(math.max(0, MapFeatureSize-12), 6)

    -- center maze

    local xoff = div((4000 % step), 2)

    for y = 48,2048,step do

       for x = 48+xoff,4048-step,step do

            if GetRandom(2) == 0 then

                AddPoint(x,y,width)

                AddPoint(x+step,y+step)

            else

                AddPoint(x,y+step,width)

                AddPoint(x+step,y)

            end

        end

    end

    FlushPoints()

end