// initialize positions
float fax;
float fay;
float fbx;
float fby;
float fcx;
float fcy;


void setup () {
  background(0);
  size(512,512);
  stroke(255,15);
  strokeWeight(10);
  fill(0,5);
  fax = random(200,300);
  fay = random(200,300);
  fbx = random(150,350);
  fby = random(150,350);
  fcx = random(150,350);
  fcy = random(150,350);
};
void draw () {
  stroke(0,5);
  rect(0,0,height,width);
  //firefly 1
  float cx = random(-4,4);
  float cy = random(-4,4);
  fax = fax + cx;
  fay = fay + cy;
  float z;
  if(sqrt(sq(fax - fbx) + sq(fay - fby)) < sqrt(sq(fax - fcx) + sq(fay - fcy))) {
    z = random(sqrt(sq(fax-fbx) + sq(fay-fby)));
  } 
  else {
    z = random(sqrt(sq(fax-fcx) + sq(fay-fcy)));
  };
  if(z < 1) {
    stroke(random(180,220),255,0,100);
  } 
  else {
    stroke(150,15);
  };
  point(fax,fay);

  //firefly 2
  cx = random(-4,4);
  cy = random(-4,4);
  fbx = fbx + cx;
  fby = fby + cy;
  if(sqrt(sq(fax - fbx) + sq(fay - fby)) < sqrt(sq(fbx - fcx) + sq(fby - fcy))) {
    z = random(sqrt(sq(fax-fbx) + sq(fay-fby)));
  } 
  else {
    z = random(sqrt(sq(fbx-fcx) + sq(fby-fcy)));
  };
  if(z < 1) {
    stroke(random(180,220),255,0,100);
  } 
  else {
    stroke(150,15);
  };
  point(fbx,fby);

  //firefly 3
  cx = random(-4,4);
  cy = random(-4,4);
  fcx = fcx + cx;
  fcy = fcy + cy;
  if(sqrt(sq(fcx - fbx) + sq(fcy - fby)) < sqrt(sq(fax - fcx) + sq(fay - fcy))) {
    z = random(sqrt(sq(fcx-fbx) + sq(fcy-fby)));
  } 
  else {
    z = random(sqrt(sq(fax-fcx) + sq(fay-fcy)));
  };
  if(z <1) {
    stroke(random(180,220),255,0,100);
  } 
  else {
    stroke(150,15);
  };
  point(fcx,fcy);
};

void mousePressed() {
  setup();
};