Plot hole in a rectangular plate

Hi,

Does anybody know how can we plot a hole with different shape inside a rectangular 2-D plate in MATLAB? Consider we have the parametric map function: x=sin(t)-ecos(nt) y=cos(t)+esin(nt) e and n are shape parameters and t is any angle between 0 and 360 degrees. The function could be anything. I just made an example to clarify my point. Maybe any other software is much efficient. if anybody knows please help.

Thanks