--track0:Intvl,0,1000,1
--track1:Loop,0,1000,10,1
--check0:Front,0

spe = obj.track0
num = obj.track1

for i=0,num do
    if(obj.check0) then
        obj.draw(0,0,-i*spe)
    else
        obj.draw(0,0,i*spe)
    end
end