Scribbled circle

int num = 50;
float r;
float theta;
int ox, oy;
color ccol = #C70025;

void setup() {
  size(900, 600);
  background(255);
  noFill();
  ox = width/2;
  oy = height/2;
  r = height/4;

  drawVCircle();
}

void draw() {
}

void drawVCircle() {

  stroke(ccol, 200);
  strokeWeight(random(1, 4));
  beginShape();
  for (int i=0; i < num; i++) {
    theta = random(TAU);
    float x = ox + sin(theta)*r;
    float y = oy + cos(theta)*r;
    vertex(x, y);
  }
  endShape();
}

void mouseClicked() {
  drawVCircle();
}

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