//    Particle Systems with Image Textures (Image Texture)

//    The Nature of Code

//    The Coding Train / Daniel Shiffman

//    https://youtu.be/pUhv2CA0omA

//    https://thecodingtrain.com/learning/nature-of-code/4.4-image-textures.html

​

​

class Particle {

  constructor(x, y) {

    this.pos = createVector(x, y);

    this.vel = p5.Vector.random2D();

    this.vel.mult(random(0.5, 2));

    this.acc = createVector(0, 0);

    this.r = 64;

    this.lifetime = 255;

    let ran = random(1);

    if (ran < 0.75) this.col = 0;

    else if (ran < 0.80) this.col = 1;

    else this.col = 2

  }

​

  finished() {

    return this.lifetime < 0;

  }

​

  applyForce(force) {

    this.acc.add(force);

  }

​

  update() {

    this.vel.add(this.acc);

    this.pos.add(this.vel);

    this.acc.set(0, 0);

​

    this.lifetime -= 5;

  }

​

  show() {

    // tint(150, 40, 80, this.lifetime);

    imageMode(CENTER);

    let idx = 255-this.lifetime;

    if (idx < 0) idx = 0;

    image(m_textures[this.col][idx], this.pos.x, this.pos.y, this.r, this.r);

  }

}

​