assignment4Error23.js

var earth;
var moon;


function setup() {
  createCanvas(1000, 600);
  background(0);

  earth = new Earth(0, 0, random(30, 50));
  moon = new Moon(100, 100, random(3, 5));
}

function draw() {
  background(0, 30);

  push();

  translate(width / 2, height / 2);


  //attraction between earth and moon
  var G = p5.Vector.sub(earth.pos, moon.pos);
 
  G.limit(5);
  G.mult(earth.eGravity * moon.mGravity);
  moon.applyAttraction(G);
  
  moon.update();
  moon.display();
  
  earth.update();
  earth.display();

  pop();
}
"use strict"

class Earth {
  constructor(x, y, rad) {
    this.pos = createVector(x, y);
    this.vel = createVector(0, 0); // ***
    this.acc = createVector(0, 0);
    this.rad = 20;
    this.airRad = 25;
    this.eGravity = rad * 0.001;
  }

  applyForce(f) {
    f.div(this.mass);
    this.acc.add(f);
  }

  update() {
    this.pos.x = cos(frameCount * 0.01) * 39;
    this.pos.y = sin(frameCount * 0.01) * 39;

    this.vel.add(this.acc);
    this.pos.add(this.vel);
    this.acc.mult(0);
  }

  display() {
    push();
    translate(this.pos.x, this.pos.y);
    noStroke();


    fill(0, 0, 255, 100);
    ellipse(0, 0, this.rad * 2 * this.mass, this.rad * 2 * this.mass);
    noFill();
    stroke(255, 10);
    strokeWeight(5);
    ellipse(0, 0, this.airRad * 2 * this.mass, this.airRad * 2 * this.mass);

    pop();


  }

}
"use strict"

class Moon {
  constructor(x, y, rad) {
    this.pos = createVector(x, y);
    this.vel = createVector(0, 0); // ***
    this.acc = createVector(0, 0);
    this.rad = 3;
    this.mGravity = rad * 0.001;
  }
  applyAttraction(GRAVITY) {
    GRAVITY.mult(this.mass / this.rad);
    this.acc.add(GRAVITY);

  }
  applyForce(f) {
    f.div(this.mass);
    this.acc.add(f);
  }

  update() {

    this.pos.x = cos(frameCount * 0.01) * 10;
    this.pos.y = sin(frameCount * 0.01) * 10;
    this.vel.add(this.acc);
    this.pos.add(this.vel);
    this.acc.mult(0);

  }

  display() {
    push();
    translate(this.pos.x, this.pos.y);
    noStroke();
    fill(255);
    ellipse(0, 0, this.rad * 2 * this.mass, this.rad * 2 * this.mass);
    pop();


  }

}