Vertex circle

int num = 50;
float r;
float theta;
int ox, oy;
color ccol = #000000;

void setup() {
  size(400, 300);
  background(255);
  noFill();
  ox = width/2;
  oy = height/2;
  r = height/2.5;
}

void draw() {

  if (frameCount % 10 ==0 && frameCount < 201) {
    drawVCircle();
    saveFrame("line-####.gif");
  }

}

void drawVCircle() {

  stroke(ccol, 150);
  strokeWeight(random(1, 2));
  beginShape();
  for (int i=0; i < num; i++) {
    theta = random(TAU);
    //float over = random(20);
    float over = 0;
    float x = ox + over + sin(theta)*r;
    float y = oy + over + cos(theta)*r;
    vertex(x, y);
  }
  endShape();
}

void mouseClicked() {
  drawVCircle();
}

void keyPressed() {
  save(random(1234)+".jpg");
}