@hackoregon/component-library/es/LandingPage/CanvasParticles.js

Official repo for Hack Oregon React component library

function _typeof(obj) { if (typeof Symbol === "function" && typeof Symbol.iterator === "symbol") { _typeof = function _typeof(obj) { return typeof obj; }; } else { _typeof = function _typeof(obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; }; } return _typeof(obj); }

function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }

function _defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } }

function _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); return Constructor; }

function _possibleConstructorReturn(self, call) { if (call && (_typeof(call) === "object" || typeof call === "function")) { return call; } return _assertThisInitialized(self); }

function _assertThisInitialized(self) { if (self === void 0) { throw new ReferenceError("this hasn't been initialised - super() hasn't been called"); } return self; }

function _getPrototypeOf(o) { _getPrototypeOf = Object.setPrototypeOf ? Object.getPrototypeOf : function _getPrototypeOf(o) { return o.__proto__ || Object.getPrototypeOf(o); }; return _getPrototypeOf(o); }

function _inherits(subClass, superClass) { if (typeof superClass !== "function" && superClass !== null) { throw new TypeError("Super expression must either be null or a function"); } subClass.prototype = Object.create(superClass && superClass.prototype, { constructor: { value: subClass, writable: true, configurable: true } }); if (superClass) _setPrototypeOf(subClass, superClass); }

function _setPrototypeOf(o, p) { _setPrototypeOf = Object.setPrototypeOf || function _setPrototypeOf(o, p) { o.__proto__ = p; return o; }; return _setPrototypeOf(o, p); }

function _templateObject() {
  var data = _taggedTemplateLiteral(["\n  position: fixed;\n"]);

  _templateObject = function _templateObject() {
    return data;
  };

  return data;
}

function _taggedTemplateLiteral(strings, raw) { if (!raw) { raw = strings.slice(0); } return Object.freeze(Object.defineProperties(strings, { raw: { value: Object.freeze(raw) } })); }

import React from "react";
import { css } from "emotion";
import window from "global/window";
import { get, has } from "lodash";
var canvasStyles = css(_templateObject());

var CanvasParticles = function (_React$Component) {
  _inherits(CanvasParticles, _React$Component);

  function CanvasParticles() {
    _classCallCheck(this, CanvasParticles);

    return _possibleConstructorReturn(this, _getPrototypeOf(CanvasParticles).apply(this, arguments));
  }

  _createClass(CanvasParticles, [{
    key: "componentDidMount",
    value: function componentDidMount() {
      window.requestAnimFrame = function () {
        return get(window, "requestAnimationFrame") || get(window, "webkitRequestAnimationFrame") || get(window, "mozRequestAnimationFrame") || get(window, "oRequestAnimationFrame") || get(window, "msRequestAnimationFrame") || function (callback) {
          has(window, "setTimeout") && window.setTimeout(callback, 1000 / 60);
        };
      }();

      var canvas = this.refs.canvas;
      var ctx = canvas.getContext("2d");
      var img = this.refs.image;
      var W = get(window, "innerWidth", 1000);
      var H = get(window, "innerHeight", 1000);
      canvas.width = W * 1.2;
      canvas.height = H * 1.2;
      var particleCount = 40;
      var particles = [];
      var minDist = 100;

      function paintCanvas() {
        ctx.fillStyle = "rgba(255, 255, 255, 1)";
        ctx.fillRect(0, 0, W, H);
      }

      function Particle() {
        this.x = Math.random() * W;
        this.y = Math.random() * H;
        this.vx = -1 + Math.random() * 2;
        this.vy = -1 + Math.random() * 2;
        this.radius = 4;

        this.draw = function () {
          ctx.fillStyle = "lightgrey";
          ctx.beginPath();
          ctx.arc(this.x, this.y, this.radius, 0, Math.PI * 2, false);
          ctx.fill();
        };
      }

      for (var i = 0; i < particleCount; i++) {
        particles.push(new Particle());
      }

      function draw() {
        paintCanvas();

        for (var _i = 0; _i < particles.length; _i++) {
          var p = particles[_i];
          p.draw();
        }

        update();
      }

      function update() {
        for (var _i2 = 0; _i2 < particles.length; _i2++) {
          var p = particles[_i2];
          p.x += p.vx;
          p.y += p.vy;
          if (p.x + p.radius > W) p.x = p.radius;else if (p.x - p.radius < 0) {
            p.x = W - p.radius;
          }
          if (p.y + p.radius > H) p.y = p.radius;else if (p.y - p.radius < 0) {
            p.y = H - p.radius;
          }

          for (var j = _i2 + 1; j < particles.length; j++) {
            var p2 = particles[j];
            distance(p, p2);
          }
        }
      }

      function distance(p1, p2) {
        var dx = p1.x - p2.x;
        var dy = p1.y - p2.y;
        var dist = Math.sqrt(dx * dx + dy * dy);

        if (dist <= minDist) {
          ctx.beginPath();
          ctx.strokeStyle = "rgba(239,74,93,".concat(1.0 - dist / minDist, ")");
          ctx.moveTo(p1.x, p1.y);
          ctx.lineTo(p2.x, p2.y);
          ctx.stroke();
          ctx.closePath();
          var ax = dx / 200000;
          var ay = dy / 200000;
          p1.vx -= ax;
          p1.vy -= ay;
          p2.vx += ax;
          p2.vy += ay;
        }
      }

      function animloop() {
        draw();
        requestAnimFrame(animloop);
      }

      animloop();
    }
  }, {
    key: "render",
    value: function render() {
      return React.createElement("div", null, React.createElement("canvas", {
        ref: "canvas",
        className: canvasStyles
      }));
    }
  }]);

  return CanvasParticles;
}(React.Component);

export default CanvasParticles;