Pinwheel - pure JavaScript

index.html

<canvas id="canvas">Canvas not supported.</canvas>

pinwheel-pure-javascript.markdown

Pinwheel - pure JavaScript

A Pen by Toshiya Marukubo on CodePen.

License.

script.js

/*
* File Name / pinwheel.js
* Created Date / Aug 14, 2020
* Aurhor / Toshiya Marukubo
* Twitter / https://twitter.com/toshiyamarukubo
*/

(function () {
  'use strict';
  window.addEventListener('load', function () {
    var canvas = document.getElementById('canvas');

    if (!canvas || !canvas.getContext) {
      return false;
    }

    /********************
      Random Number
    ********************/

    function rand(min, max) {
      return Math.floor(Math.random() * (max - min + 1) + min);
    }
    
    /********************
      Var
    ********************/

    var ctx = canvas.getContext('2d');
    var X = canvas.width = window.innerWidth;
    var Y = canvas.height = window.innerHeight;
    var mouseX = null;
    var mouseY = null;
    var bubbles = [];
    var bubbleNum = 150;
    var shapes = [];
    var rad = Math.PI * 2 / 4;
    var style = {
      black: 'black',
      white: 'white',
      lineWidth: 4,
    };

    if (X < 768) {
      bubbleNum = 100;
    }

    /********************
      Animation
    ********************/

    window.requestAnimationFrame =
      window.requestAnimationFrame ||
      window.mozRequestAnimationFrame ||
      window.webkitRequestAnimationFrame ||
      window.msRequestAnimationFrame ||
      function(cb) {
        setTimeout(cb, 17);
      };

    /********************
      Bubble
    ********************/

    function Bubble(ctx, x, y) {
      this.ctx = ctx;
      this.init(x, y);
    }
    
    Bubble.prototype.init = function(x, y) {
      this.x = x;
      this.y = y;
      this.r = rand(20, 50);
      this.ga = Math.random() * Math.random() * Math.random();
      this.v = {
        x: rand(-1, 1) * Math.random() * Math.random(),
        y: Math.random()
      };
      this.random = Math.random();
      this.a = rand(0, 360);
      this.rad = this.a * Math.PI / 180;
      this.as = rand(0, 360) * Math.PI / 180;
    };
    
    Bubble.prototype.draw = function() {
      var ctx  = this.ctx;
      ctx.save();
      ctx.fillStyle = 'white';
      ctx.strokeStyle = 'white';
      ctx.lineCap = 'round';
      ctx.lineWidth = this.r / 4;
      ctx.globalAlpha = this.ga;
      ctx.translate(this.x, this.y);
      ctx.rotate(this.rad);
      ctx.translate(-this.x, -this.y);
      ctx.beginPath();
      ctx.arc(this.x, this.y, this.r, 0, Math.PI * 2, false);
      ctx.fill();
      ctx.globalAlpha = this.ga * 1.1;
      ctx.beginPath();
      ctx.arc(this.x, this.y, this.r * 0.7, this.as, this.as + 1, false);
      ctx.stroke();
      ctx.restore();
    };

    Bubble.prototype.updatePosition = function() {
      if (this.y > Y - Y / 3) {
        this.v.x += 0.1;
        this.v.y -= 0.01;
      }
      this.x += this.v.x;
      this.y += this.v.y;
    };

    Bubble.prototype.updateParams = function(i) {
      this.a += this.random;
      this.rad = this.a * Math.PI / 180;
    };

    Bubble.prototype.wrapPosition = function() {
      if (this.x > X + this.r / 2) {
        this.init(rand(0, X), rand(0 - Y / 5, 0));
      }
    };

    Bubble.prototype.render = function(i) {
      this.updateParams(i);
      this.updatePosition();
      this.wrapPosition();
      this.draw();
    };

    for (var i = 0; i < bubbleNum; i++) {
      var b = new Bubble(ctx, rand(0, X), rand(0, Y / 2));
      bubbles.push(b);
    }

    /********************
      Shape
    ********************/
     
    function Shape(ctx, x, y) {
      this.ctx = ctx;
      this.init(x, y);
    }
    
    Shape.prototype.init = function(x, y) {
      this.x = x;
      this.y = y;
      this.r = rand(20, 30);
      this.a = 0;
      this.rad = this.a * Math.PI / 180;
      this.random = Math.random();
      this.c = rand(0, 360);
      this.a1 = rand(-10, 10);
      this.rad1 = this.a1 * Math.PI / 180;
    };
    
    Shape.prototype.draw = function() {
      var ctx  = this.ctx;
      ctx.save();
      ctx.fillStyle = 'hsl(' + this.c + ', 100%, 80%)';
      ctx.strokeStyle = 'hsl(' + this.c + ', 80%, 60%)';
      ctx.translate(this.x, this.y);
      ctx.rotate(this.rad1);
      ctx.translate(-this.x, -this.y);
      ctx.lineWidth = this.r / 10;
      ctx.beginPath();
      ctx.moveTo(this.x, this.y);
      ctx.lineTo(this.x, Y + 10);
      ctx.stroke();
      ctx.lineWidth = 1;
      ctx.translate(this.x, this.y);
      ctx.rotate(Math.tan(this.rad));
      ctx.translate(-this.x, -this.y);
      ctx.fillRect(this.x - this.r, this.y - this.r, this.r * 2, this.r * 2);
      ctx.fillStyle = 'hsl(' + this.c + ', 80%, 60%)';
      for (var j = 0; j < 4; j++) {
        ctx.translate(this.x, this.y);
        ctx.rotate(90 * Math.PI / 180);
        ctx.translate(-this.x, -this.y);
        ctx.beginPath();
        ctx.moveTo(Math.cos(rad * 0) * this.r + this.x, Math.sin(rad * 0) * this.r + this.y + this.r);
        for (var i = 1; i < 4; i++) {
          if (i !== 2) {
            ctx.lineTo(Math.cos(rad * i) * this.r + this.x, Math.sin(rad * i) * this.r + this.y + this.r);
          }
        }
        ctx.closePath();
        ctx.fill();
      }
      ctx.restore();
    };

    Shape.prototype.updateParams = function() {
      this.a += this.random;
      this.rad = this.a * Math.PI / 180;
    };

    Shape.prototype.render = function(i) {
      this.updateParams();
      this.draw();
    };

    for (var i = 0; i < X;) {
      var dist = rand(1, 50);
      var s = new Shape(ctx, i += dist, rand(Y - Y / 3, Y - Y / 6));
      shapes.push(s);
    }

    /********************
      Render
    ********************/
    
    function render() {
      ctx.clearRect(0, 0, X, Y);
      for (var i = 0; i < shapes.length; i++) {
        shapes[i].render(i);
      }
      for (var i = 0; i < bubbles.length; i++) {
        bubbles[i].render(i);
      }
      requestAnimationFrame(render);
    }

    render();

    /********************
      Event
    ********************/
    
    function onResize() {
      X = canvas.width = window.innerWidth;
      Y = canvas.height = window.innerHeight;
      if (X < 768) {
        bubbleNum = 100;
      } else {
        bubbleNum = 200;
      }
      shapes = [];
      bubbles = [];
      for (var i = 0; i < X;) {
        var dist = rand(1, 50);
        var s = new Shape(ctx, i += dist, rand(Y - Y / 3, Y - Y / 6));
        shapes.push(s);
      }
      for (var i = 0; i < bubbleNum; i++) {
        var b = new Bubble(ctx, rand(0, X), rand(0, Y / 2));
        bubbles.push(b);
      }
    }

    window.addEventListener('resize', function() {
      onResize();
    });

    canvas.addEventListener('click', function(e) {
      mouseX = e.clientX;
      mouseY = e.clientY;
      var num = rand(1, 20);
      for (var i = 0; i < num; i++) {
        var b = new Bubble(ctx, rand(mouseX - 100, mouseX + 100), rand(mouseY - 100, mouseY + 100));
        bubbles.push(b);
      }
    }, false);

  });
})();

style.css

* {
  font-family: 'arial black', Helvetica, verdana, monospace, sans-serif;
  letter-spacing: 0.2rem;
  margin: 0;
  padding: 0;
  color: #FFF;
  overflow: hidden;
}

body {
  position: relative;
}

canvas#canvas {
  display: block;
  background: #ABE7FF;
}