Planet.js

// Developer - JustNikhill
// LinkedIn - https://www.linkedin.com/in/nikhil-yadav-609435203/
// HackerRank - https://www.hackerrank.com/JustNikhil?hr_r=1
class Planet {
    constructor(r, d, o, img) {
      this.v = p5.Vector.random3D();
  
      this.radius = r;
      this.distance = d;
      this.v.mult(this.distance);
      this.angle = random(TWO_PI);
      this.orbitspeed = o;
  
      this.planets = null;
  
      //  save the texture for later use instead of creating a globe.
      this.texture = img;
    }
  
    orbit() {
      this.angle = this.angle + this.orbitspeed;
      if (this.planets != null) {
        for (let i = 0; i < this.planets.length; i++) {
          this.planets[i].orbit();
        }
      }
    }
  
    spawnMoons(total, level) {
      this.planets = [];
      for (let i = 0; i < total; i++) {
        let r = this.radius / (level * 2);
        let d = random(this.radius + r, (this.radius + r) * 2);
        let o = random(-0.1, 0.1);
        let index = int(random(0, textures.length));
        this.planets[i] = new Planet(r, d, o, textures[index]);
        if (level < 2) {
          let num = int(random(0, 3));
          this.planets[i].spawnMoons(num, level + 1);
        }
      }
    }
  
    show() {
      push();
      noStroke();
      let v2 = createVector(1, 0, 1);
      let p = this.v.cross(v2);
        
      // Rotation around a 0-length axis doesn't work in p5.js, so don't do that.
        
      if (p.x != 0 || p.y != 0 || p.z != 0) {
        rotate(this.angle, p);
      }
      stroke(255);
        
                    //line(0, 0, 0, this.v.x, this.v.y, this.v.z);
                    //line(0, 0, 0, p.x, p.y, p.z);
  
      translate(this.v.x, this.v.y, this.v.z);
      noStroke();
      fill(255);
        
      // Since we don't have a PShape, we draw a textured sphere instead.
        
      texture(this.texture);
      sphere(this.radius);
       
        
      if (this.planets != null) {
        for (let i = 0; i < this.planets.length; i++) {
          this.planets[i].show();
        }
      }
      pop();
    }
  }