// Author: Daniel Kaye

//  URL: http://dnkaye.com/2020_CodingChallenges.html

//

// Based on Daniel Schiffman's (Coding Train) coding challenges

//  URL: https://thecodingtrain.com/CodingChallenges/007-solarsystemgenerator

//  

// What is this?

//  Attempt to draw a moving model of a 2D solar system

//

// How do I do this?

//  I attempt to complete Daniel Schiffman's coding challenges before watching

//  his video, then afterwards I watch and see what he did differently, and learn!

​

// Things I'm proud of / differences from The Coding Train version:

// -Video makes planets as recursive object (sun, planets, moon, all same class), which at first I was impressed by, but as video progressed I'm glad I made them all seperate, it seemed unbenefitial in this case

// -orbit and planet radius generation that avoids overlaps

// -mine draws the orbit lines

// -spent a long time trying to make this work with elliptical orbits, too much math, gave up

// -random chance of moons OR rings

​

let planets = [];

let orbitRadii = [];

let numOfPlanets = 6;

let speed = 0.001;

let minPlanetRadius = 5;

let maxPlanetRadius = 20;

let sunRadius = 20;

​

function setup() {

  createCanvas(400, 400);

  generateOrbitRadii();

  generatePlanets();

}

​

function draw() {

  if (focused || frameCount < 30) {

    background(0);

    translate(width / 2, height / 2);

    drawSun();

    drawAllOrbits();

    moveAllPlanets();

    drawAllPlanets();

  } else {

    drawUnpauseInstructions();

  }

}

​

function drawUnpauseInstructions() {

  noStroke();

  fill(255);

  textAlign(CENTER);

  textSize(18);

  text('click to activate', width / 2, height - height / 5);

}

​

function generatePlanets() {

  for (let i = 0; i < numOfPlanets; i++) {

    if (i == 0) {

      planets.push(new Planet(orbitRadii[i], sunRadius, orbitRadii[i + 1]));

    } else if (i < numOfPlanets - 1) {

      planets.push(new Planet(orbitRadii[i], orbitRadii[i - 1], orbitRadii[i + 1]));

    } else {

      planets.push(new Planet(orbitRadii[i], orbitRadii[i - 1], orbitRadii[i] * 2));

    }

  }

}

​

// ensures radi don't overlap and are evenly spaced

function generateOrbitRadii() {

  let previousRadius = sunRadius;

  let numOfPlanetsRemaining = numOfPlanets;

  let minOrbitForNextPlanet = previousRadius + minPlanetRadius;

  let availableSpaceForNextOrbit = width / 2 - previousRadius;

  let maxOrbitForNextPlanet = (availableSpaceForNextOrbit / numOfPlanetsRemaining) + previousRadius;

  for (let i = numOfPlanets; i > 0; i--) {

    orbitRadii.push(random(minOrbitForNextPlanet, maxOrbitForNextPlanet));

    previousRadius = orbitRadii[orbitRadii.length - 1];

    // numOfPlanetsRemaining -= 1;

    minOrbitForNextPlanet = previousRadius + minPlanetRadius;

    availableSpaceForNextOrbit = width / 2 - previousRadius;

    maxOrbitForNextPlanet = (availableSpaceForNextOrbit / i) + previousRadius;

  }

  print(orbitRadii);

}

​

function drawAllPlanets() {

  for (let planet of planets) {

    planet.draw();

  }

}

​

function moveAllPlanets() {

  for (let planet of planets) {

    planet.move();

  }

}

​

function drawSun() {

  fill(253, 184, 19); // sun yellow/orange

  noStroke();

  circle(0, 0, sunRadius * 2);

}

​

function drawAllOrbits() {

  for (let planet of planets) {

    planet.drawOrbit();

  }

}

​

function isHovered() {

  if (mouseX > 0 && mouseX < width && mouseY > 0 && mouseY < height) {

    return true;

  } else {

    noStroke();

    fill(255);

    textAlign(CENTER);

    text('mouseover canvas to activate', width / 2, height - 30);

    return false;

  }

}