The ornamental design for a swimmingpoolform, substantially as shown.
FIG. 1 is a frontal perspective view of a straight swimming pool form
according to the present invention;
FIG. 2 is a rear perspective view of the swimming pool form of FIG. 1;
FIG. 3 is a side view of the swimming pool form of FIG. 1;
FIG. 4 is a top view of a curved swimming pool form according to the
present invention, differing from the swimming pool form of FIG. 1 only in
that it is curved rather than straight; and
FIG. 5 is a side view of the swimming pool form of FIG. 4.