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HTML

              
                
              
            
!

CSS

              
                * {
  margin: 0;
  padding: 0;
}

html,
body {
  overflow: hidden;
}

body {
  position: relative;
}

              
            
!

JS

              
                /*
* File Name / no name
* Created Date / Oct 16, 2020
* Aurhor / Toshiya Marukubo
* Twitter / https://twitter.com/toshiyamarukubo
*/

/*
  Common Tool.
*/

class Tool {
  // random number.
  static randomNumber(min, max) {
    return Math.floor(Math.random() * (max - min + 1) + min);
  }
  // random color rgb.
  static randomColorRGB() {
    return (
      "rgb(" +
      this.randomNumber(0, 255) +
      ", " +
      this.randomNumber(0, 255) +
      ", " +
      this.randomNumber(0, 255) +
      ")"
    );
  }
  // random color hsl.
  static randomColorHSL(saturation, lightness) {
    return (
      "hsl(" +
      this.randomNumber(0, 360) +
      ", " +
      saturation +
      "%, " +
      lightness +
      "%)"
    );
  }
  // gradient color.
  static gradientColor(ctx, cr, cg, cb, ca, x, y, r) {
    const col = cr + "," + cg + "," + cb;
    const g = ctx.createRadialGradient(x, y, 0, x, y, r);
    g.addColorStop(0, "rgba(" + col + ", " + (ca * 1) + ")");
    g.addColorStop(0.5, "rgba(" + col + ", " + (ca * 0.5) + ")");
    g.addColorStop(1, "rgba(" + col + ", " + (ca * 0) + ")");
    return g;
  }
}

/*
  When want to use angle.
*/

class Angle {
  constructor(angle) {
    this.a = angle;
    this.rad = this.a * Math.PI / 180;
  }

  incDec(num) {
    this.a += num;
    this.rad = this.a * Math.PI / 180;
    return this.rad;
  }
}

/*
  When want to use controller.
*/

class Controller {
  constructor(id) {
    this.id = document.getElementById(id);
  }
  getVal() {
    return this.id.value;
  }
}

/*
  When want to use time.
*/

class Time {
  constructor(time) {
    this.startTime = time;
    this.lastTime;
    this.elapsedTime;
  }

  getElapsedTime() {
    this.lastTime = Date.now();
    this.elapsedTime = (this.startTime - this.lastTime) * -1;
    return this.elapsedTime;
  }
}

/*
  When want to use vector.
*/

class Vector2d {
  constructor(x, y) {
    this.vx = x;
    this.vy = y;
  }

  scale(scale) {
    this.vx *= scale;
    this.vy *= scale;
  }

  add(vec2) {
    this.vx += vec2.vx;
    this.vy += vec2.vy
  }

  sub(vec2) {
    this.vx -= vec2.vx;
    this.vy -= vec2.vy;
  }

  negate() {
    this.vx = -this.vx;
    this.vy = -this.vy;
  }

  length() {
    return Math.sqrt(this.vx * this.vx + this.vy * this.vy);
  }

  lengthSquared() {
    return this.vx * this.vx + this.vy * this.vy;
  }

  normalize() {
    let len = Math.sqrt(this.vx * this.vx + this.vy * this.vy);
    if (len) {
      this.vx /= len;
      this.vy /= len;
    }
    return len;
  }

  rotate(angle) {
    let vx = this.vx;
    let vy = this.vy;
    let cosVal = Math.cos(angle);
    let sinVal = Math.sin(angle);
    this.vx = vx * cosVal - vy * sinVal;
    this.vy = vx * sinVal + vy * cosVal;
  }

  toString() {
    return '(' + this.vx.toFixed(3) + ',' + this.vy.toFixed(3) + ')';
  }
}

let canvas;

class Canvas {
  constructor(bool) {
    // create canvas.
    this.canvas = document.createElement("canvas");
    // if on screen.
    if (bool === true) {
      this.canvas.style.display = 'block';
      this.canvas.style.top = 0;
      this.canvas.style.left = 0;
      document.getElementsByTagName("body")[0].appendChild(this.canvas);
    }
    this.ctx = this.canvas.getContext("2d");
    this.width = this.canvas.width = window.innerWidth;
    this.height = this.canvas.height = window.innerHeight;
    // mouse infomation.
    this.mouseX = null;
    this.mouseY = null;
    this.mouseZ = null;
    // ball
    this.ballNum = 36;
    this.balls = [];
    this.clearId = [];
  }
  
  // init, render, resize
  init() {
    let that = this;
    let p = Promise.resolve();
    for (let i = 1; i < this.ballNum + 1; i++) {
      p = p
      .then(function() {
        return new Promise(function(res, rej) {
          that.clearId.push(setTimeout(function() {
            const b = new Ball(that.ctx, that.width - that.width / that.ballNum * i, that.height / 2 + 5 * i, 2 * i, i * 20);
            that.balls.push(b);
          }, i * 100));
          res();
        });
      });
    }
  }

  render() {
    this.ctx.clearRect(0, 0, this.width, this.height);
    for (let i = 0; i < this.balls.length; i++) {
      this.balls[i].render();
    }
  }
  
  resize() {
    this.width = this.canvas.width = window.innerWidth;
    this.height = this.canvas.height = window.innerHeight;
    this.balls = [];
    for (let i = 0; i < this.clearId.length; i++) {
      clearTimeout(this.clearId[i]);
    }
    this.init();
  }
}

/*
  Ball class.
*/

class Ball {
  constructor(ctx, x, y, r, i) {
    this.ctx = ctx;
    this.init(x, y, r, i);
  }

  init(x, y, r, i) {
    this.t = new Time(new Date());
    this.ratio = i / 10 / 10;
    this.x = x;
    this.xi = x;
    this.y = 0;
    this.yi = y;
    this.r = r;
    this.i = i;
    this.lw = this.r / 50;
    this.a = new Angle(this.i);
    this.v = new Vector2d(0, 0);
  }

  draw() {
    const ctx = this.ctx;
    ctx.save();
    ctx.lineWidth = this.lw;
    ctx.strokeStyle = 'hsl(' + Math.sin(this.a.rad / 5) * 360 + ', 80%, 60%)';
    ctx.fillStyle = 'hsl(' + Math.sin(this.a.rad / 5) * 360 + ', 80%, 60%)';
    ctx.translate(this.x, 0);
    ctx.rotate(0.05 * this.ratio * Math.sin(this.a.rad));
    ctx.translate(-this.x, 0);
    ctx.beginPath();
    ctx.moveTo(this.xi, 0);
    ctx.quadraticCurveTo(Math.sin(this.a.rad) * 30 + this.xi, this.y / 2, this.x, this.y);
    ctx.stroke();
    ctx.beginPath();
    ctx.arc(this.x, this.y, this.r, 0, Math.PI * 2, false);
    ctx.fill();
    ctx.stroke();
    ctx.lineCap = 'round';
    ctx.strokeStyle = 'hsl(' + Math.sin(this.a.rad / 5) * 360 + ', 80%, 80%)';
    ctx.lineWidth = this.lw * 10;
    ctx.beginPath();
    ctx.arc(this.x, this.y, this.r * 0.7, Math.PI * 1.1, Math.PI * 1.4, false);
    ctx.stroke();
    ctx.restore();
    ctx.save();
    this.dropShadow();
    ctx.restore();
  }

  dropShadow() {
    const ctx = this.ctx;
    ctx.save();
    ctx.fillStyle = 'hsl(' + Math.sin(this.a.rad / 5) * 360 + ', 80%, 60%)';
    ctx.globalAlpha = 0.5;
    ctx.beginPath();
    ctx.ellipse(Math.sin(-this.a.rad) * 30 * this.ratio + this.x, this.y + 100 * this.ratio / 5, this.r, this.r / 20, 0, Math.PI * 2, false);
    ctx.fill();
    ctx.restore();
  }

  elasticity() {
    this.v.vy += (this.yi - this.y) * 0.3;
    this.v.vy *= 0.5;
    this.y += this.v.vy;
  }
  
  render() {
    this.draw();
    this.elasticity();
    this.a.incDec(1);
  }
}

(function () {
  "use strict";
  window.addEventListener("load", function () {
    canvas = new Canvas(true);
    canvas.init();
    
    function render() {
      window.requestAnimationFrame(function () {
        canvas.render();
        render();
      });
    }
    
    render();

    // event
    window.addEventListener("resize", function () {
      canvas.resize();
    }, false);

  });
})();
              
            
!
999px

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