Button

boolean circles = false;

int x = 250;

int y = 250;

int x1 = 250;

int y1 = 250;

​

void setup () {

  size(500,500);

}

​

void draw (){

  background(#96f76c);

  fill(#ffe175);

  stroke(#21b241);

  rectMode(CENTER);

  rect(250,250,100,100);

  if (circles == true){

    fill(#7cc6ff);

    ellipse(mouseX-50,mouseY-50,50,50);

    ellipse(mouseX+50,mouseY-50,50,50);

    ellipse(mouseX-50,mouseY+50,50,50);

    ellipse(mouseX+50,mouseY+50,50,50);

    fill(#8e7cff);

    ellipse(x,250,50,50);

    x = x+4;

    ellipse(250,y,50,50);

    y = y+4;

    ellipse(x,y,50,50);

    ellipse(x1,250,50,50);

    ellipse(250,y1,50,50);

    ellipse(x1,y1,50,50);

    x1 = x1-4;

    y1 = y1-4;

  }

}

​

void mousePressed (){

   if (mouseX >= 200 && mouseX <= 300 &&

  mouseY >= 200 && mouseX <= 300) {

   circles = true;

  } else {

    circles = false;

  }

}