// The Nature of Code

// The Coding Train / Daniel Shiffman

// https://youtu.be/okfZRl4Xw-c

// https://thecodingtrain.com/learning/nature-of-code/3.7-additive-waves.html

// https://editor.p5js.org/codingtrain/sketches/qcRsZ_O5a

​

let waves = [];

let ship;

let slider_period;

let slider_amp;

let ship_data;

let ship_img;

let min_H = 1;

let max_H = 3;

let min_T = 5;

let max_T = 20;

let factor = 3;

​

function preload() {

  RollData = loadJSON('Roll_RAO.json');

  HeaveData = loadJSON('Heave_RAO.json');

  ship_img = loadImage('Ship emoji.png');

}

​

​

​

function setup() {

  wave = new AiryWave(random(min_H, max_H), random(min_T,max_T));

  ship = new Ship();

  ship.load_RollData(RollData);

  ship.load_HeaveData(HeaveData);

  ship.load_img(ship_img);

  ship.calcRollRAO();

  ship.calcHeaveRAO();

  createCanvas(600, 400);

  slider_period = createSlider(min_T, max_T, wave.T);

  slider_period.position(10, 10);

  slider_period.size(80);

  slider_amp = createSlider(min_H, max_H, wave.a);

  slider_amp.position(10, 30);

  slider_amp.size(80);

​

}

​

function draw() {

  frameRate(50);

  background(0);

​

  for (let x = 0; x < width; x += 5) {

    let y = 0;

    // let factor = 5;

    y += factor * wave.evaluate(x);

​

    noStroke();

    fill('#128ECC');

    ellipse(x, y + height / 2, 4);

  }

​

  let T = slider_period.value();

  let a = slider_amp.value();

  wave.update();

  wave.update_wave(a, T);

  let period_text = 'Wave period: ' + T + ' sec'

  let wave_height_text = 'Wave height: ' + a + ' m'

  text(period_text, 100, 25);

  text(wave_height_text, 100, 45);

  ship.calcRollResponse(wave);

  ship.calcHeaveResponse(wave);

  ship.draw(wave);

}

​

​