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jupiter_system.html
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jupiter_system.html
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<!DOCTYPE html>
<html>
<head>
<script language="javascript" type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/p5.js/1.1.9/p5.js"></script>
<script language="javascript" type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/p5.js/0.8.0/addons/p5.dom.js"></script>
<style>
body {
padding: 0;
margin: 0;
}
</style>
</head>
<body>
<script>
const AU = 149.598e6 * 1000;
const G = 6.67430e-11;
let SCALE = 100 / AU; // 1 AU = 100 pixels
let SCALE_DIS, SCALE_SIZE;
const TIMESTEP = 3600;
let centerX, centerY, sliderScale, sliderMoonsSize;
let objects, jupiter, io, europa, ganymede, callisto;
function setup() {
createCanvas(900, 630);
// frameRate(10)
sliderScale = createSlider(20, 100, 22, 1);
sliderScale.position(10, height - 20);
sliderScale.style('width', '875px');
jupiter = new Planet(0,"Jupiter", 0, 0, 71492 * 1000, 1.8982e27, '#ccccff', 0, 0);
jupiter.center = true;
io = new Planet(1,"Io", -423400 * 1000, 0, 1821.6 * 1000, 8.931938e22, '#e6b800', 0, 17.334 * 1000, 44);
europa = new Planet(2,"Europa", -676938 * 1000, 0, 1560.8 * 1000, 4.799844e22, '#3399ff', 0, 13.74336 * 1000, 88);
ganymede = new Planet(3,"Ganymede", -1071600 * 1000, 0, 2634.1 * 1000, 1.4819e23, '#669999', 0, 10.880 * 1000, 172);
//
callisto = new Planet(4,"Callisto", -1897000 * 1000, 0, 2410.3 * 1000, 1.075938e23, '#9933ff', 0, 8.204 * 1000, 412);
objects = [jupiter, io, europa, ganymede, callisto];
// objects = [jupiter, europa];
centerX = width / 2 + 150;
centerY = height / 2;
}
function draw() {
background(0);
SCALE = sliderScale.value() / AU;
SCALE_DIS = SCALE * 10 ** 3;
SCALE_SIZE = SCALE * 10 ** 3;
for (let [i, p] of objects.entries()) {
if (i !== 0) {
p.update(i);
}
p.show();
}
fill(255);
noStroke();
textSize(16);
text(`${frameRate().toFixed(1)} fps`, width - 60, 20);
text(`${frameCount}`, width - 60, 50);
// if (frameCount > 3) {
// noLoop();
// }
}
class Planet {
constructor(num, name, x, y, r, m, c, vx, vy, n) {
this.pos = createVector(x, y);
this.vel = createVector(vx, vy);
this.acc = createVector(0, 0);
this.mass = m;
this.radius = r;
this.color = color(c);
this.orbit = [];
this.orbitN = n;
this.aphelion = 0;
this.perihelion = 0;
this.avg_dis = x;
this.center = false;
this.distance_to_center = 0;
this.name = name;
this.num = num;
this.v_max = 0;
this.v_min = 0;
}
attraction(other) {
let distance_x = other.pos.x - this.pos.x;
let distance_y = other.pos.y - this.pos.y;
let distance = sqrt(distance_x ** 2 + distance_y ** 2);
if (other.center) {
this.distance_to_center = distance;
if (this.distance_to_center < this.perihelion || this.perihelion == 0) {
this.perihelion = this.distance_to_center;
}
if (this.distance_to_center > this.aphelion) {
this.aphelion = this.distance_to_center;
}
}
let force = G * (this.mass * other.mass) / distance ** 2;
let theta = atan2(distance_y, distance_x);
let force_x = cos(theta) * force;
let force_y = sin(theta) * force;
return {
x: force_x,
y: force_y
};
}
update(num) {
for (let [i, obj] of objects.entries()) {
if (this !== obj) {
let force = this.attraction(obj);
this.acc.add(force.x, force.y);
}
}
this.vel.add(this.acc.div(this.mass).mult(TIMESTEP));
this.pos.add(this.vel.copy().mult(TIMESTEP));
this.acc.set(0, 0);
this.orbits();
this.velocity = sqrt(this.vel.x ** 2 + this.vel.y ** 2) / 1000
if (this.velocity < this.v_min || this.v_min == 0) {
this.v_min = this.velocity;
}
if (this.velocity > this.v_max) {
this.v_max = this.velocity;
}
}
orbits() {
this.orbit.push({
x: this.pos.x,
y: this.pos.y
});
}
show() {
noStroke();
fill(this.color, 80);
let moonScale = 1;
if (!this.center) {
moonScale = 10;
}
ellipse(
this.pos.x * SCALE_DIS + centerX,
this.pos.y * SCALE_DIS + centerY,
this.radius * 2 * SCALE_SIZE * moonScale);
if (this.num != 0) {
textSize(14);
text(`${this.name}: ${(this.distance_to_center/1000).toFixed(2)} km`, 10, this.num * 125 + 20 - 125);
text(`Perihelion: ${(this.perihelion/1000).toFixed(2)} km`, 10, this.num * 125 + 35 - 125);
text(`Aphelion: ${(this.aphelion/1000).toFixed(2)} km`, 10, this.num * 125 + 50 - 125);
text(`Orbital velocity: ${(this.velocity).toFixed(2)} km/s`, 10, this.num * 125 + 65 - 125);
text(`Avg. orbital velocity: ${((this.v_max+this.v_min)/2).toFixed(3)} km/s`, 10, this.num * 125 + 80 - 125);
text(`Max. orbital velocity: ${this.v_max.toFixed(2)} km/s`, 10, this.num * 125 + 95 - 125);
text(`Min. orbital velocity: ${this.v_min.toFixed(2)} km/s`, 10, this.num * 125 + 110 - 125);
text(`Eccentricity: ${(1-2/((this.v_max/this.v_min)+1)).toFixed(5)}`, 10, this.num * 125 + 125 - 125);
}
for (let i = 0; i < this.orbit.length; i++) {
if (this.orbit.length > this.orbitN) {
this.orbit.splice(0, 1);
}
noFill();
strokeWeight(2);
stroke(this.color, 50);
point(
this.orbit[i].x * SCALE_DIS + centerX,
this.orbit[i].y * SCALE_DIS + centerY);
}
}
}
</script>
</body>
</html>