let mp = false;

function setup() {

  createCanvas(800, 800);

  particle = new Particle(width/2,height/2);

}

​

function draw() {

  background(0);

  particle.update(mp);

  if(mp){

    particle.show(2);

  }

  else{

    particle.show(1);

  }

}

function mousePressed(){

  mp = !mp;

}