let FPS = 60

let timer = 0;

​

let particlesPerFrame;

let gravity;

let acc;

let vel;

let size;

let lifetime;

let pos;

​

let useMouse = true

​

​

​

//-----------------------------// 

​

function setup() {

  createCanvas(600, 600);

    frameRate(FPS)

​

}

​

​

​

function draw() {

//-----------------------------// 

​

  gravity = createVector(0,0.);

  particlesPerFrame = 2;

  acc = createVector(0,0);

  acc.y = random(-3,3)

  acc.x = random(-3,3)

  vel = createVector(0,-0);

  size = 30;

  decay = 3;

  if (useMouse)

    pos = createVector(mouseX,mouseY);

  else

    pos = xMotion();

//-----------------------------// 

  background(0);

    for (let i = 0; i < particlesPerFrame; i++){

      particle = new Particle(

        pos.x,

        pos.y,

        vel,

        acc,

        size,

        decay);

      particles.push(particle);

​

      // particle = new SqrParticle(

      //   pos.x,

      //   pos.y,

      //   vel,

      //   acc,

      //   size,

      //   decay);

      // particles.push(particle);

    }

  for (let i = 0; i < particles.length; i++){

    particles[i].accelerate(gravity);

    particles[i].update();

    if (particles[i].finished()){

      particles.splice(i,1);

    }

    particles[i].show();

​

  }

}

​

​

// function circMotion(){

//   let time = frameCount/40

//   let radius = width/4

//   let x = width / 2 + cos(time) * radius;

//   let y = height / 2 + sin(time) * radius;

​

//   return createVector(x,y)  

// }

​

function xMotion(){

  let time = frameCount/40

  // let radius = width/2 * sin(frameCount/15)*0.5

  let x = sin(time) * width/3 + width/2;

  let y = sin(time*2)* height/3 + height/2;

​

  return createVector(x,y)  

}