// drawing a line from every point to the center of the circle
void setup() {
  size(600, 600);

  for (int i=0; i<50; i++) {
    drawCircle(int(random(width)), int(random(height)), int(random(50)));
  }
}

void drawCircle(int centerx, int centery, int radius) {
  int steps = 30;
  int size = radius*2;
  float angle = 2*PI/steps;
  stroke(random(255), random(255), random(255), 127);  
  for (int i=0; i<steps; i++) {
    float x = sin(angle*i)*radius + centerx;
    float y = cos(angle*i)*radius + centery; 

    line(centerx, centery, x, y);
  }
}