constructor(xTemp, yTemp, noiseScaleArg) {

    // Initialise the position of the particle

    this.varPosition = createVector(xTemp, yTemp);

    this.initialPosition = createVector(xTemp, yTemp);

    this.noiseScaleArg = noiseScaleArg;

    //scale factor for noise

    this.noiseScale = slider.value()/map(sin(noiseScaleArg), -1, 1, 1, 2);

  }

​

  // display particle as a point

  display() {

    point(this.varPosition.x, this.varPosition.y);

  }

​

  //update particles position based on the noise

  update() {

    // updating noiseScale based on value of slider

    this.noiseScale = slider.value()/map(sin(this.noiseScaleArg), -1, 1, 1, 2);

    //calculate noise value based on position

    let n = noise(

      this.varPosition.x * this.noiseScale,

      this.varPosition.y * this.noiseScale,

      frameCount * this.noiseScale * this.noiseScale

    );

    //Map noise to an angle

    let a = TAU * n;

    //Update particles position based on the angle

    this.varPosition.x += cos(a);

    this.varPosition.y += sin(a);

​

    //if particle is off-screen, reset to random location

    if (!this.onScreen()) {

      this.varPosition.x = this.initialPosition.x;

      this.varPosition.y = this.initialPosition.y;

    }

  }

​

  //check if particle is on screen

  onScreen() {

    return (

      this.varPosition.x >= 0 &&

      this.varPosition.x <= width &&

      this.varPosition.y >= 0 &&

      this.varPosition.y <= height

    );

  }

}