<!--
article: https://raygun.io/blog/2014/07/making-svg-html-burger-button/
-->

<div id="hamburger" class="hamburglar is-open">

    <div class="burger-icon">
      <div class="burger-container">
        <span class="burger-bun-top"></span>
        <span class="burger-filling"></span>
        <span class="burger-bun-bot"></span>
      </div>
    </div>
    
    <!-- svg ring containter -->
    <div class="burger-ring">
      <svg class="svg-ring">
        <path class="path" fill="none" stroke="#fff" stroke-miterlimit="10" stroke-width="4" d="M 34 2 C 16.3 2 2 16.3 2 34 s 14.3 32 32 32 s 32 -14.3 32 -32 S 51.7 2 34 2" />
      </svg>
    </div>
    <!-- the masked path that animates the fill to the ring -->
    
    <svg width="0" height="0">
       <mask id="mask">
    <path xmlns="http://www.w3.org/2000/svg" fill="none" stroke="#ff0000" stroke-miterlimit="10" stroke-width="4" d="M 34 2 c 11.6 0 21.8 6.2 27.4 15.5 c 2.9 4.8 5 16.5 -9.4 16.5 h -4" />
       </mask>
     </svg>
    <div class="path-burger">
      <div class="animate-path">
        <div class="path-rotation"></div>
      </div>
    </div>
      
  </div>

<h4>Click the Icon</h4>

// vars
$color: #fff;     // icon color
$blue: #158fef;   // background color
$animation: 0.6s; // animation speed
$scale: 1;        // icon scale 68/68 default

*, *:before, *:after {
  box-sizing: border-box;
 }

// spacing + background-color
body {
  background: $blue;
  padding: 40px;
}

h4 {
  font-family: arial,helvetica,serif;
  color: $color;
  font-size: 18px;
  text-align: center;
  margin: 40px 0 0;
  
}

.hamburglar {
  transform: scale($scale);
  margin: 40px auto;
  position: relative;
  display: block;
  width: 68px;
  height: 68px;
  background: $blue;
  -webkit-touch-callout: none;
  user-select: none;
}

// transition mask
.path-burger {
  position: absolute;
  top: 0;
  left: 0;
  height: 68px;
  width: 68px;
  // two masks because... browser support.
  mask: url(#mask);
  -webkit-mask-box-image: url(https://raygun.io/upload/mask.svg);
}

.animate-path {
  position: absolute;
  top: 0;
  left: 0;
  width: 68px;
  height: 68px;
}

// what this does is create a small square that I then rotate behind an svg mask, giving the apparence of the line animating
.path-rotation {
  height: 34px;
  width: 34px;
  margin: 34px 34px 0 0;
  transform: rotate(0deg);
  transform-origin: 100% 0;
  &:before {
    content: '';
    display: block;
    width: 30px;
    height: 34px;
    margin: 0 4px 0 0;
    background: $color;
  }
}

// box rotation animation
@keyframes rotate-out {
  0% {
    transform: rotate(0deg);
  }
  40% {
    transform: rotate(180deg);
  }
  100% {
    transform: rotate(360deg);
  }
}

@keyframes rotate-in {
  0% {
    transform: rotate(360deg);
  }
  40% {
    transform: rotate(180deg);
  }
  100% {
    transform: rotate(0deg);
  }
}

// offset moves
// dasharray is the dash size
// need to be able to control dash space size.

.hamburglar.is-open {
  .path {
    animation: dash-in $animation linear normal;
    animation-fill-mode:forwards;
  }
  .animate-path {
    animation: rotate-in $animation linear normal;
    animation-fill-mode:forwards;
  }
}

.hamburglar.is-closed {
  .path {
    animation: dash-out $animation linear normal;
    animation-fill-mode:forwards;
  }
  .animate-path {
    animation: rotate-out $animation linear normal;
    animation-fill-mode:forwards;
  }
}

.path {
  stroke-dasharray: 240;
  stroke-dashoffset: 240;
  stroke-linejoin: round;
}

@keyframes dash-in {
  0% {
    stroke-dashoffset: 240;
  }
  40% {
    stroke-dashoffset: 240;
  }
  100% {
    stroke-dashoffset: 0;
  }
}
@keyframes dash-out {
  0% {
    stroke-dashoffset: 0;
  }
  40% {
    stroke-dashoffset: 240;
  }
  100% {
    stroke-dashoffset: 240;
  }
}



// All good burgers need filling!

.burger-icon {
  position: absolute;
  padding: 20px 16px;
  height: 68px;
  width: 68px;
}

.burger-container {
  position: relative;
  height: 28px;
  width: 36px;
}

.burger-bun-top,
.burger-bun-bot,
.burger-filling {
  position: absolute;
  display: block;
  height: 4px;
  width: 36px;
  border-radius: 2px;
  background: $color;
}

.burger-bun-top {
  top: 0;
  transform-origin: 34px 2px;
}

.burger-bun-bot {
  bottom: 0;
  transform-origin: 34px 2px;
}
//.burger-filling {
//  @include transition(all,($animation/2.5),ease-in-//out);
//}
// relative parent is the button
.burger-filling {
  top: 12px;
}





// burger ring container
.burger-ring {
  position: absolute;
  top: 0;
  left: 0;
  width: 68px;
  height: 68px;
}

.svg-ring {
  width: 68px;
  height: 68px;
}


// bun animations 
.hamburglar.is-open {
  .burger-bun-top {
    animation: bun-top-out $animation linear normal;
    animation-fill-mode:forwards;
  }
  .burger-bun-bot {
    animation: bun-bot-out $animation linear normal;
    animation-fill-mode:forwards;
  }
}
.hamburglar.is-closed {
  .burger-bun-top {
    animation: bun-top-in $animation linear normal;
    animation-fill-mode:forwards;
  }
  .burger-bun-bot {
    animation: bun-bot-in $animation linear normal;
    animation-fill-mode:forwards;
  }
}

@keyframes bun-top-out {
  0% {
    left: 0;
    top: 0;
    transform: rotate(0deg);
  }
  20% {
    left: 0;
    top: 0;
    transform: rotate(15deg);
  }
  80% {
    left: -5px;
    top: 0;
    transform: rotate(-60deg);
  }
  100% {
    left: -5px;
    top: 1px;
    transform: rotate(-45deg);
  }
}

@keyframes bun-bot-out {
  0% {
    left: 0;
    transform: rotate(0deg);
  }
  20% {
    left: 0;
    transform: rotate(-15deg);
  }
  80% {
    left: -5px;
    transform: rotate(60deg);
  }
  100% {
    left: -5px;
    transform: rotate(45deg);
  }
}


@keyframes bun-top-in {
  0% {
    left: -5px;
    bot: 0;
    transform: rotate(-45deg);
  }
  20% {
    left: -5px;
    bot: 0;
    transform: rotate(-60deg);
  }
  80% {
    left: 0;
    bot: 0;
    transform: rotate(15deg);
  }
  100% {
    left: 0;
    bot: 1px;
    transform: rotate(0deg);
  }
}

@keyframes bun-bot-in {
  0% {
    left: -5px;
    transform: rotate(45deg);
  }
  20% {
    left: -5px;
    bot: 0;
    transform: rotate(60deg);
  }
  80% {
    left: 0;
    bot: 0;
    transform: rotate(-15deg);
  }
  100% {
    left: 0;
    transform: rotate(0deg);
  }
}


// burger filling
.hamburglar.is-open {
  .burger-filling {
    animation: burger-fill-out $animation linear normal;
    animation-fill-mode:forwards;
  }
}

.hamburglar.is-closed {
  .burger-filling {
    animation: burger-fill-in $animation linear normal;
    animation-fill-mode:forwards;
  }
}

@keyframes burger-fill-in {
  0% {
    width: 0;
    left: 36px;
  }
  40% {
    width: 0;
    left: 40px;
  }
  80% {
    width: 36px;
    left: -6px;
  }
  100% {
    width: 36px;
    left: 0px;
  }
}

@keyframes burger-fill-out {
  0% {
    width: 36px;
    left: 0px;
  }
  20% {
    width: 42px;
    left: -6px;
  }

  40% {
    width: 0;
    left: 40px;
  }

  100% {
    width: 0;
    left: 36px;
  }
}

  $('document').ready(function () {
    var trigger = $('#hamburger'),
        isClosed = true;

    trigger.click(function () {
      burgerTime();
    });

    function burgerTime() {
      if (isClosed == true) {
        trigger.removeClass('is-open');
        trigger.addClass('is-closed');
        isClosed = false;
      } else {
        trigger.removeClass('is-closed');
        trigger.addClass('is-open');
        isClosed = true;
      }
    }

  });