actors={
    list={},

    add=function(actor)
        actor.dx,actor.dy=0,0
        table.insert(actors.list, actor)
    end,

    draw=function()
        for i,v in ipairs(actors.list) do
            sspr(v.gfx.x,v.gfx.y,16,16,v.x*8+v.dx,v.y*8+v.dy,16,16,v.o)
        end
    end,

    update=function()
        for i,v in ipairs(actors.list) do
            if v.dx==0 and v.dy==0 then
                if v.path then
                    v.path.pos=v.path.pos+1
                    if v.path.pos > #v.path.route then
                        v.path=nil
                    else
                        local step=string.sub(v.path.route,v.path.pos,v.path.pos)
                        if step=='u' then
                            --check collision!
                            v.y=v.y-1
                            v.dy=-8
                        elseif step=='d' then
                            --check collision!
                            v.y=v.y+1
                            v.dy=8
                        elseif step=='l' then
                            --check collision!
                            v.x=v.x-1
                            v.dx=-8
                        elseif step=='r' then
                            --check collision!
                            v.x=v.x+1
                            v.dx=8
                        end
                    end
                end
            else
                if v.dx > 0 then
                    v.dx=v.dx-2
                elseif v.dx < 0 then
                    v.dx=v.dx+2
                elseif v.dy > 0 then
                    v.dy=v.dy-2
                elseif v.dy < 0 then
                    v.dy=v.dy+2
                end
            end
        end
    end
}