//I am here today and looked up rings. If you click on screen, rings will show up.

Ring[] rings;                 
int numRings = 100;
int currentRing = 10;

boolean record = false;

void setup() {
  size(500, 500);
  smooth();
  rings = new Ring[numRings];  //  array
  for (int i = 0; i < numRings; i++) {
    rings[i] = new Ring();     //  object
  }
}

void draw() {
  if(record) {
    beginRecord(PDF, ".pdf"); 
  }

  background(25, 25, 255);
  for (int i = 0; i < numRings; i++) {
    rings[i].grow();
    rings[i].display();
  }

  if(record) {
    endRecord();
    record = false; 
  }

}

void keyPressed() {
  record = true; 
}

// Click to create a new Ring
void mousePressed() {
  rings[currentRing].start(mouseX, mouseY);
  currentRing++;
  if (currentRing >= numRings) {
    currentRing = 10;
  }
}

class Ring {
  float x, y;          
  float diameter;      
  boolean on = false;  

  void start(float xpos, float ypos) {
    x = xpos;
    y = ypos; 
    on = true;
    diameter = 1;
  }

  void grow() {
    if (on == true) {
      diameter += 2.0;
      if (diameter > height*1.5) {
        on = false;
      }
    }
  }

  void display() {
    if (on == true) {
      noFill();
      strokeWeight(10);
      stroke(222, 253);
      ellipse(x, y, diameter, diameter);
    }
  }
}