how to make tarp withdrawable or roll in as a patio cover from house to building as attached

[katina]

want to roll or draw string back tarp used as a cover over patio from eve of house to 20 or 30 feet away to wood shed how to do that?

[Anonymous]

3 clotheslines. 2 woven through the tarp's side grommets and 1 set 1-foot higher in the center (to create a peak) through the tarp's center grommets. You'd staple or wire-tie at each grommet so the tarp can pull taught and retract together, hopefully by just reeling the center clothesline in and out.