Experiment

exp.pde

int SWID = 1440;
int SHEI = 720;

void setup () {
  size(SWID, SHEI);
  background(255,255,255);
}

void drawCircle (int cx, int cy, int rd, int res) {
  pushMatrix();
  translate(cx, cy);
  int r = rd;
  for (float t = 0; t < Math.PI * 2; t += Math.PI / res) {
    float x = (float) (r * Math.cos(t));
    float y = (float) (r * Math.sin(t));
    ellipse(x, y, 7, 3);
  }
  popMatrix();
}

int frame = 0;
void draw() {
  frame++;
  drawCircle(SWID / 2, SHEI / 2, frame, frame);
}