The points to stretch; they are not changed and the result keeps their order.
OptionalcenterThe point that stays in place; distances are measured from it.
OptionaldirectionThe direction to stretch along; distances across it do not change.
OptionalscaleThe factor applied along the direction; 1 leaves the points as they are, 2 doubles their distance from the center along it.
Points, a center, a direction and a factor for
point.stretchPointsDirFromCenter, which scales only along that direction.