class Star 

{

  constructor() 

  {

    // setting random vector position

    this.position = createVector(random(width), random(height));

    // setting random size for the stars

    this.size = random(3, 7);

    // setting random vector velocity between the given range

    this.velocity = createVector(random(-0.3, 0.3), random(-0.3, 0.3));

    // setting random vector acceleration between the given range

    this.acceleration = createVector(random(-0.01, 0.01), random(-0.01, 0.01));

  }

​

  update() 

  {

    // Update the velocity and position based on acceleration

    this.position.add(this.velocity);

    // Limit acceleration 

    if (this.velocity < 5)

      {

        this.velocity.add(this.acceleration);

      }

   }

​

  display() 

  {

    // initializing variables that make up the star

    let starPoints = random(3, 7); 

    let externalRadius = this.size;

    let internalRadius = this.size * 0.4;

    // Angles distributed evenly around circle based on number of star points

    let angle = TWO_PI / starPoints;

    let halfAngle = angle / 2.0;

    fill(255);

    // Drawing a star: https://p5js.org/examples/form-star.html

    beginShape();

    for (let a = 0; a < TWO_PI; a += angle) 

    {

      // adjusting the coordinates based on sin and cos waves

      // this is for the outer radius of the star

      let starX = this.position.x + cos(a) * externalRadius; 

      let starY = this.position.y + sin(a) * externalRadius;

      vertex(starX, starY);

      // adjusting the coordinates based on sin and cos waves

      // this is for the inner radius of the star

      starX = this.position.x + cos(a + halfAngle) * internalRadius;

      starY = this.position.y + sin(a + halfAngle) * internalRadius;

      vertex(starX, starY);

    }

    endShape(CLOSE);

  }

  checkEdges()

  {

    // Checks the position of the star is at the borders, flips the direction of velocity accordingly

      if((this.position.x>width) || (this.position.x<0))

    {

      this.velocity.x = this.velocity.x * -1;

    }

  if((this.position.y>width) || (this.position.y<0))

    {

      this.velocity.y = this.velocity.y * -1;

    }

  }

}

​