$ \begin{cases} x(t) = c_x + R\cos\!\big(f_x\,t\big) \\ y(t) = c_y + R\sin\!\big(f_y\,t\big) \end{cases} \qquad t \in [0^\circ, 360^\circ] $ <iframe src="https://editor.p5js.org/juliuslsk/full/5RBM_wSS5" width=630 height=630></iframe>