Hello,
Hope you can help.
I have simplified my sketch to two buttons (of 16), each button should call a draw method of a shape rotated, (pop1c for button one) and (pop2c for button two).
Because I have a method doAll() the pop1c(20, 20) & pop2c(80, 80) need to be incorporated at the bottom of the doAll() method to run, BUT this means they are run at the same time. How can I separate them? I enclose my code, and further down the button code to go on a separate tab.

//MAIN SKETCH

int x ;
int y ;
int a =0;
int i =0;
Button button1, button2;
boolean checker, checker2;
void setup() {
  size(800, 800);
  background(255);
  boolean checker = false;
  boolean checker2 = false;
  button1 = new Button (x+20, y+20, 60);
  button2 = new Button (x+120, y+20, 60);
}
void draw() {
  background(255);

  button1.update();//display button
  button1.display();//refresh every frame


  button2.update();//display button
  button2.display();//refresh every frame

  if (checker) { //If the button is pressed run shape rotated and translated
    doAll();//new method that contains translate, rotate
  }
}

void mousePressed() {
  if (button1.press()) {
    checker = true;
    checker2 = false;
    print("BUT1");
  }
  else if (button2.press()) {
    checker = true;
    checker2 = false;
    print("BUT2");
  }
}
void doAll() {//method to rotate and translate shape
  frameRate(5);
  translate(400, 400);
  for (int i=0; i<32; i++) {
    rotate(PI/14.0);
    smooth();
    strokeWeight(0.5);
    pop1c(20, 20);
    pop2c(80, 80);
  }
}

void pop1c(int x, int y) {//Circle1
  int c1 = (int)random(-1, 32);
  ellipse(100, 0, c1-8, c1+5);
}
void pop2c(int x, int y) {
  int c2 = (int)random(-2, 8);
  ellipse(80, 0, c2-10, c2);
}


//BUTTON FOR SEPARATE TAB


class Button{
 
  int x, y;//variables for X&Y coordinates
  int size;//size of button width and height
  boolean over = false;
  boolean pressed = false;
 
  Button(int xp, int yp, int s){
    x = xp;
    y = yp;
    size = s;
  }
 
  void update(){//updates the over field every time
    if ((mouseX >= x) && (mouseX <= x + size) &&
        (mouseY >= y) && (mouseY <= y + size)){
          over = true;
        } else {
          over = false;
        }
  }
  boolean press(){
    if (over == true){
      pressed = true;
      return true;
    } else {
      return false;
    }
  }
  void release(){
    pressed = false;
  }
  void display()
  {
    rect(x,y,size,size);
  }
}