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                  <canvas id="canvas"></canvas>

            
          
!
            
                    html, body {
        width:  100%;
        height: 100%;
        margin: 0px;
        padding: 0px;
        overflow: hidden;
      }

      body{
        background: #001;
        text-align: center;
      }

      #canvas{
        display: inline-block;
        position: relative;
        top: 50%;
        transform: translateY(-50%);
        max-width: 100%;
        max-height: 100%;
      }
            
          
!
            
              let canvas = document.querySelector('#canvas');
let ctx = canvas.getContext('2d');

// const colors = ["#82FFEB", "#549FCC", "#116699", "#FFCAC2", "#CC5456"];

function resize(){
  canvas.width = 1920;
  canvas.height = 1000;
}

//window.onresize = resize;
resize();


class Brain{
  constructor(savedBrain){
    this.neurons = [];
    this.synapses = [];
    this.electrons = [];

    if(savedBrain){
      // Load saved neurons
      for(let loadNeuron of savedBrain.neurons){
        let neuron = this.createNeuron();
        Object.keys(loadNeuron).forEach( key => {
          neuron[key] = loadNeuron[key];
        });
        let randomHue = Math.floor(Math.random() * 360);
        neuron.color = `hsl(${randomHue}, 80%, 33%)`;
      }

      // Load saved synapses
      for(let loadSynapse of savedBrain.synapses){
        let from = this.neurons[loadSynapse.from];
        let to = this.neurons[loadSynapse.to];
        from.createSynapse(to);
      }
    }
  }

  createNeuron(){
    let neuron = new Neuron(this, ...arguments);
    neuron.id = this.neurons.length;
    this.neurons.push(neuron);
    return neuron;
  }

  addSynapse(synapse){
    synapse.id = this.synapses.length;
    this.synapses.push(synapse);
  }

  addElectron(electron){
    electron.id = this.electrons.length;
    this.electrons.push(electron);
  }

  JSONstringify(){
    let neurons = JSON.parse(JSON.stringify(this.neurons, (key, value) => {
      if(key === "brain" || key === "synapses"){
        return undefined;
      }
      return value;
    }));

    let synapses = JSON.parse(JSON.stringify(this.synapses, (key, value) => {
      if(key === "brain" || key === "electrons"){
        return undefined;
      }
      if(value instanceof Neuron){
        return value.id;
      }
      return value;
    }));

    let electrons = JSON.parse(JSON.stringify(this.electrons, (key, value) => {
      if(key === "brain"){
        return undefined;
      }
      if(value instanceof Synapse){
        return value.id;
      }
      return value;
    }));

    return JSON.stringify({neurons, synapses, electrons});
  }
}

class Neuron{
  constructor(brain, x, y, color, size){
    this.brain = brain;
    this.x = x;
    this.y = y;
    this.color = color;
    this.size = size * 0.5;
    this.baseSize = size;
    this.sizeVelocity = 1;
    this.synapses = [];
  }

  createSynapse(neuron){
    let synapse = new Synapse(this.brain, this, neuron);
    this.addSynapse(synapse);
    neuron.addSynapse(synapse);
    this.brain.addSynapse(synapse);
    return synapse;
  }

  addSynapse(synapse){
    this.synapses.push(synapse);
  }

  animate(progress){
    let difference = this.baseSize - this.size;
    this.sizeVelocity += difference * progress * 40;
    this.sizeVelocity *= Math.pow(0.03, progress);
    this.size += this.sizeVelocity * progress;
  }
}

class Synapse{
  constructor(brain, from, to){
    this.brain = brain;
    this.from = from;
    this.to = to;

    this.electrons = [];

    if(Math.random() < 0.33){
      this.createElectron();
    }
  }

  createElectron(){
    let electron = new Electron(this.brain, this);
    this.electrons.push(electron);
    this.brain.addElectron(electron);
    return electron;
  }

  removeElectron(removeElectron){
    this.electrons = this.electrons.filter(electron => electron !== removeElectron);
    removeElectron.synapse = undefined;
  }

  getDirection(){
    return Math.atan2(this.from.y - this.to.y, this.from.x - this.to.x);
  }

  addElectron(electron, from){
    if(this.from === from){
      electron.reverseDirection = false;
    }
    else{
      electron.reverseDirection = true;
    }

    this.electrons.push(electron);
    electron.synapse = this;
  }
}

class Electron{
  constructor(brain, synapse){
    this.synapse = synapse;
    this.brain = brain;
    this.size = 10;
    this.reverseDirection = false;
    this.progress = Math.random();
    this.speed = 0.4 + Math.random() * 0.2;
  }

  getFrom(){
    return this.reverseDirection ? this.synapse.to : this.synapse.from;
  }

  getTo(){
    return this.reverseDirection ? this.synapse.from : this.synapse.to;
  }

  getPosition(){
    let x, y;
    let progress = this.reverseDirection ? easeInOutQuad(this.progress) : easeInOutQuad(1 - this.progress);
    let toOffset = this.synapse.to.baseSize - this.size * 1.5;
    let fromOffset = this.synapse.to.baseSize - this.size * 1.5;
    let direction = this.synapse.getDirection();

    x = (this.synapse.to.x + toOffset * Math.cos(direction)) * (1 - progress) + (this.synapse.from.x - fromOffset * Math.cos(direction)) * progress;
    y = (this.synapse.to.y + toOffset * Math.sin(direction)) * (1 - progress) + (this.synapse.from.y - fromOffset * Math.sin(direction)) * progress;

    return {x, y};
  }

  getVelocity(){
    return easeInOutQuadDeriv(this.progress);
  }

  getDirection(){
    if(this.reverseDirection){
      return this.synapse.getDirection();
    }
    else{
      return this.synapse.getDirection() + Math.PI;
    }
  }

  animate(progress){
    this.progress += progress * this.speed;

    if(this.progress > 1){
      let toSynpses = this.getTo().synapses;
      let randomSynapse = toSynpses[Math.floor(Math.random() * toSynpses.length)];

      let oldTo = this.getTo();
      this.progress = 0;
      this.synapse.removeElectron(this);
      randomSynapse.addElectron(this, oldTo);

      oldTo.sizeVelocity += 50;
    }
  }
}

var last = null;
function anim(timestamp){
  if(!last){last = timestamp}
  let progress = (timestamp - last) / 1000;
  if(progress > 0.1){progress = 0.1};
  progress *= 2;
  last = timestamp;

  for(let electron of brain.electrons){
    electron.animate(progress);
  }

  for(let neuron of brain.neurons){
    neuron.animate(progress);
  }

  draw();

  window.requestAnimationFrame(anim);
}

function draw(){
  ctx.clearRect(0, 0, canvas.width, canvas.height);
  for(let synapse of brain.synapses){
    let direction = synapse.getDirection();
    const width = 12;
    const widthMiddle = 2;
    let middle = between(synapse.from, synapse.to, 0.5);
    let point1 = between(synapse.from, synapse.to, 0.25);
    let point2 = between(synapse.from, synapse.to, 0.06 + (synapse.from.size - synapse.from.baseSize) * 0.06);
    let point3 = between(synapse.from, synapse.to, 0.94 - (synapse.to.size - synapse.to.baseSize) * 0.06);
    let point4 = between(synapse.from, synapse.to, 0.75);
    let perp = { // Perpendicular
      x: Math.cos(direction + Math.PI / 2),
      y: Math.sin(direction + Math.PI / 2),
    };

    let gradient;
    if(!synapse.gradient){
      gradient=ctx.createLinearGradient(point2.x, point2.y, point3.x, point3.y);
      gradient.addColorStop(0, synapse.from.color);
      gradient.addColorStop(1, synapse.to.color);
      synapse.gradient = gradient;
    }
    else{
      gradient = synapse.gradient;
    }


    ctx.fillStyle = gradient;
    ctx.lineWidth = 3;
    ctx.beginPath();
    ctx.moveTo(synapse.from.x + perp.x * width, synapse.from.y + perp.y * width);
    ctx.bezierCurveTo(
      point1.x + perp.x * width,
      point1.y + perp.y * width,
      point2.x + perp.x * widthMiddle,
      point2.y + perp.y * widthMiddle,
      middle.x + perp.x * widthMiddle,
      middle.y + perp.y * widthMiddle
    );
    ctx.bezierCurveTo(
      point3.x + perp.x * widthMiddle,
      point3.y + perp.y * widthMiddle,
      point4.x + perp.x * width,
      point4.y + perp.y * width,
      synapse.to.x + perp.x * width,
      synapse.to.y + perp.y * width
    );
    ctx.lineTo(synapse.to.x - perp.x * width, synapse.to.y - perp.y * width);
    ctx.bezierCurveTo(
      point4.x - perp.x * width,
      point4.y - perp.y * width,
      point3.x - perp.x * widthMiddle,
      point3.y - perp.y * widthMiddle,
      middle.x - perp.x * widthMiddle,
      middle.y - perp.y * widthMiddle
    );
    ctx.bezierCurveTo(
      point2.x - perp.x * widthMiddle,
      point2.y - perp.y * widthMiddle,
      point1.x - perp.x * width,
      point1.y - perp.y * width,
      synapse.from.x - perp.x * width,
      synapse.from.y - perp.y * width
    );
    ctx.fill();
  }

  for(let electron of brain.electrons){
    let position = electron.getPosition();
    let direction = electron.getDirection();
    let fontSide = {
      x: position.x + Math.cos(direction) * electron.size,
      y: position.y + Math.sin(direction) * electron.size,
    };
    let upSide = {
      x: position.x + Math.cos(direction + Math.PI / 2) * electron.size,
      y: position.y + Math.sin(direction + Math.PI / 2) * electron.size,
    };
    let downSide = {
      x: position.x + Math.cos(direction - Math.PI / 2) * electron.size,
      y: position.y + Math.sin(direction - Math.PI / 2) * electron.size,
    };
    let backSide = {
      x: position.x + Math.cos(direction + Math.PI) * electron.size * (electron.getVelocity() * 1.5 + 1),
      y: position.y + Math.sin(direction + Math.PI) * electron.size * (electron.getVelocity() * 1.5 + 1),
    };

    // ctx.fillStyle = "#fff";
    // ctx.fillStyle = electron.reverseDirection ?
    //   combineColors(electron.synapse.to.color, electron.synapse.from.color, 1 - electron.progress) :
    //   combineColors(electron.synapse.to.color, electron.synapse.from.color, electron.progress);
    ctx.fillStyle = electron.synapse.gradient;
    ctx.beginPath();
    ctx.moveTo(upSide.x, upSide.y);
    ctx.arcTo(
      upSide.x + Math.cos(direction) * electron.size,
      upSide.y + Math.sin(direction) * electron.size,
      fontSide.x,
      fontSide.y,
      electron.size
    );
    ctx.arcTo(
      downSide.x + Math.cos(direction) * electron.size,
      downSide.y + Math.sin(direction) * electron.size,
      downSide.x,
      downSide.y,
      electron.size
    );
    // ctx.lineTo(downSide.x, downSide.y);
    ctx.bezierCurveTo(
      downSide.x - Math.cos(direction) * electron.size,
      downSide.y - Math.sin(direction) * electron.size,
      backSide.x + Math.cos(direction) * electron.size,
      backSide.y + Math.sin(direction) * electron.size,
      backSide.x, backSide.y
    );
    ctx.bezierCurveTo(
      backSide.x + Math.cos(direction) * electron.size,
      backSide.y + Math.sin(direction) * electron.size,
      upSide.x - Math.cos(direction) * electron.size,
      upSide.y - Math.sin(direction) * electron.size,
      upSide.x, upSide.y
    );
    ctx.fill();
  }

  for(let neuron of brain.neurons){
    ctx.fillStyle = neuron.color;
    ctx.beginPath();
    ctx.arc(neuron.x, neuron.y, neuron.size, 0, 2 * Math.PI);
    ctx.closePath();
    ctx.fill();
  }
}

function distance(neuron1, neuron2){
  return Math.sqrt(Math.pow(neuron1.x - neuron2.x, 2) + Math.pow(neuron1.y - neuron2.y, 2));
}

function between(pos1, pos2, percentage){
  return {
    x: pos1.x * (1 - percentage) + pos2.x * percentage,
    y: pos1.y * (1 - percentage) + pos2.y * percentage,
  };
}

function easeInOutQuad (t) { return t<.5 ? 2*t*t : -1+(4-2*t)*t }
function easeInOutQuadDeriv (t) { return t<.5 ? 4*t : 4*(1-t) }

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