​

let particlesPerFrame;

let gravity;

let acc;

let vel;

let size;

let lifetime;

let pos;

​

let useMouse = true

​

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

​

function setup() {

  createCanvas(600, 600);

    frameRate(60)

​

}

​

​

function draw() {

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

​

  gravity = createVector(0,0.02);

  particlesPerFrame =1;

  acc = createVector(0,0);

  acc.y = random(-5,3)

  acc.x = random(-3,3)

  vel = createVector(0,-6);

  size = 30;

  decay = 3;

  if (useMouse)

    pos = createVector(mouseX,mouseY);

  else

      pos = createVector(width/2,height*9/10);

  // pos = motion();

​

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

  background(0);

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

    particle = new SqrParticle(

      pos.x,

      pos.y,

      vel,

      acc,

      size,

      decay);

    particles.push(particle);

    // particle = new Particle(

    //   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 motion(){

//   return createVector(sin(frameCount/40)*width/6 + width/2,height*9/10)

// }