float x;
float y;
float a = 0;
float f = 0.2;

void setup() {
  size(400, 400);
  stroke(255, 255, 255);
  strokeWeight(2);
  background(0);
}

void draw() {
  translate(width/2, height/2);
  a+=0.025;
  float x = 100 * sin(a);
  float y = 100 * cos(a * f);
  point(x, y);
}