CodePen Embed - Shade - Shadow Mixin

<a href="https://github.com/DarbyBrown/Shade"><img style="position: absolute; top: 0; right: 0; border: 0;" src="https://s.cdpn.io/31787/forkme_right_blue.png" alt="Fork me on GitHub" class="ribbon"></a>
  
 <header>
<h1>SHADE</h1>
<h3>The Ultimate Shadow Mixin</h3>
</header>

<div class="text3d">
  <h2>Standard Usage</h2>
  <p>To get up and running with Shade, all you need to do is @include shade(text) or  @include shade(box) and you will get the default arguments, the results are below. The next two variables are color and depth, use like this: <code> @include shade(text, #d35400, 50);</code> </p>
  <h4>FUNKY TEXT</h4>
</div>
 

<div class="longshadows" id="long">
  <h2>Long Shadows</h2>
  <p>I've heard these are all the rage at the moment. So I've added an optional variable, <code>$long</code>. Just pass <code>$long: true</code> to the mixin and you're all set to go, creating trendy, long casting shadows. e.g.  <code>@include shade(text, blue, $long: true);</code> or <code>@include shade(box, blue, $long: true);</code> </p>
  <div class="star">
    <i class="icon-star"></i> 
  </div>
  <div class="thumb">
    <i class="icon-thumbs-up"></i> 
  </div>
  <div class="dribbble">
    <i class="icon-dribbble"></i>
  </div>  
    <div class="dollar">
    <i class="icon-usd"></i>
  </div>  
</div>  


<div class="angle-box" id="angle">
  <h2>Angle Variable</h2>
  <p>Using Compass's built in Cos and Sin functions, Shade has the capabilities to choose the direction of the shadow by just using degrees. To change the default angle of 135deg, pass the variable <code>$angle</code> to the mixin e.g. <code>@include shade(#2b3c4e, $angle: 156deg);</code></p>
  <div><h4>SHADOW</h4></div>
</div>
  
  
<div class="fade-box" id="angle">
  <h2>Fade Variable</h2>
  <p>The final variable is <code>$fade</code> which fades out the shadow, instead of a clean cut. To use this pass <code>$fade: true </code> to the mixin. A full usage mixin would be like this <code>@include shade(text, #d35400, 50, 156deg, true, true);</code></p>
  <div><h4>FADE</h4></div>
</div>  
  
  <footer>
    Handcrafted by <a href="http://darbybrown.com">Hugo Darby-Brown</a> &copy; 2013
  </footer>

@import "compass/css3";

@mixin shade($type, $color: #3498db, $depth: 20, $angle: 135deg, $long: false, $fade: false) {             
            $angle: ($angle - 90);             
            $x: 1.5 * cos($angle) + 0px;  
            $y: 1.5 * sin($angle) + 0px;  
            $darken: (lightness($color)/$depth)/2;
            $opacify: 0; 
            $shadow: ();  
            
            @if $long == true{              
              $darken:0;
            }  
            
            @if $fade == true {
              $opacify: (opacity($color)/$depth) ;
// added this for rendering in some browsers, remove if you like.
              @include translateZ(0);
            }
            
            @for $i from 1 through $depth {
              $shadow: $shadow, $i*$x $i*$y 0 hsla(hue($color) , saturation($color), (lightness($color) - ($i * $darken)), 1 - ($i * $opacify));     
            }       
            #{$type}-shadow: $shadow;
    }

  
/* ===============================================
  That's all there is to the mixin :)  
================================================= */
  
          
html {
  background: #34495e; 
  font-family: Futura, "Trebuchet MS", Arial, sans-serif;
  text-align: center;
}

header {
    margin: 0 auto;
   width: 22em; 
  }
  
h1 {
  color: #fff;           
  font-family: 'Russo One', sans-serif;
  font-size: 100px;
  margin-top: 0.5em; 
}
  
h3 {
  background: #fff; 
  color: #34495e;
  font-weight: 400;
  margin: -3.5em auto 0;
  margin-top: -3.5em;
  padding: 0.1em 0;
  position: relative;
  width: 19em;
  
  &:after, &:before {
   content: ' * * * ';
    top: 0.4em;
    position: absolute;
  }
   &:after {
    right: 0.6em;
  }
  &:before {
    left: 0.6em;
  }
}

header:hover > h3 {
  animation: 1s hover-box linear infinite;
}  

header:hover > h1 {
   animation: 1s hover-text linear infinite; 
  }

  .ribbon {
    display: none;
    @include bp(brian) {
      display: block;
    } 
  }  
  
  
%demo-boxes {
    background: rgba(black,0.08);
    border-radius: 1em;
    box-shadow: inset 1px 1px 2px rgba(black,0.3);
    color: #fff;
    margin: 3em auto;
    max-width: 60em;
    padding: 1em; 
  }
  
h2 {
  color: #fff;
  font-family: 'Russo One', sans-serif;
  font-size: 2em;
  margin: 0; 
}
  
.text3d {
  @extend %demo-boxes;
  
    h4 { 
      color: #fff;
       @include shade(text); 
      font-family: 'Russo One', sans-serif;
     font-size: 8em; 
      margin: 0.2em 0;
    }
  
}
   
.longshadows {
    @extend %demo-boxes;
    
div {
  @include shade(box, #2b3c4e, 50, 227deg, true); 
  border-radius: 1em;
  display: inline-block;
  height: 8em; 
  margin: 3em;
  overflow: hidden;
  text-align: center;
  width: 8em;          
}
    
[class*="icon-"]{
  font-size: 5em;
  line-height: 1.5;  
}
    
.star {
   background: #8e44ad;
  }
    
.icon-star {
  color: #fff;
  @include shade(text, #703688, 50, 227deg, true); 
}

.thumb {
      background: #3498db;
  }
    
.icon-thumbs-up {
  color: #fff;
  @include shade(text, #217dbb, 50, 227deg, true);
}
 
  
.dribbble {
      background: #ea4c89;
  }
    
.icon-dribbble {
  color: #fff;
  @include shade(text, #ba1655, 50, 227deg, true);
}
    
.dollar {
   background: #2ecc71; 
  }
    
.icon-usd {
  color: #fff;
  @include shade(text, #27ae60, 70, 227deg, true, true);
}    
    
}  
  

  .angle-box {
    @extend %demo-boxes;
    overflow: hidden;
    
    div {
      background: #3498db;
       @include shade(box, #2b3c4e, 150, 156deg, true);  
      height: 8em;
      margin: 4em auto 5em; 
      max-width: 28em;
      overflow: hidden;
    }
    
    h4 { 
      color: #fff;
      @include shade(text,#196090, 90, 156deg, true); 
      font-family: 'Russo One', sans-serif;
      font-size: 4em; 
      line-height: 1.7;
      margin: 0.2em 0;
    }
    
  }

.fade-box {
    @extend %demo-boxes;
    overflow: hidden;
    
    div {
      background: #e67e22;
       @include shade(box, #2b3c4e, 50, 190deg, true, true);  
      height: 8em;
      margin: 4em auto 5em; 
      max-width: 28em;
      overflow: hidden;
    }
    
    h4 { 
      color: #fff;
      @include shade(text, #d35400, 50, 190deg, true, true); 
      font-family: 'Russo One', sans-serif;
      font-size: 4em; 
      line-height: 1.7;
      margin: 0.2em 0;
    }
    
  }
    
footer {
  color: #fff;
  font-family: 'Russo One', sans-serif;
  font-size: 1.5em;
  margin-bottom: 2em;
    
    a {
     color: #fff; 
    }
}
  
  
// Animation Keyframes
  
@keyframes hover-text {
      0%, 100% {
     @include shade(text, #2980b9, 15, 45deg, true);  
    }
    25% {
      @include shade(text, #2980b9, 15, 135deg, true);  
    }
    50% {
     @include shade(text, #2980b9, 15, 225deg, true);   
    }
    75% {
     @include shade(text, #2980b9, 15, 315deg, true);   
    }
  }
  
@keyframes hover-box {
      0%, 100% {
     @include shade(box, #2980b9, 15, 45deg, true);  
    }
    25% {
      @include shade(box, #2980b9, 15, 135deg, true);  
    }
    50% {
     @include shade(box, #2980b9, 15, 225deg, true);   
    }
    75% {
     @include shade(box, #2980b9, 15, 315deg, true);   
    }
  }

View Compiled

/* Requires Compass!

Shade - The shadow mixin that lets you specify shadow direction by angle 

If you'd like to make this Mixin better, get involved https://github.com/DarbyBrown/Shade

If you don't use compass, you could use the following function:

Created by Jelmer Borst - https://twitter.com/japborst 

$pi: 3.14159265359;

@function pow($base,$exp){
	$value: $base;
	@if $exp > 1{
		@for $i from 2 through $exp{
			$value: $value * $base;
		}
	}
	@if $exp < 1{
		@for $i from 0 through -$exp{
			$value: $value / $base;
		}
	}
	@return $value;
}
@function fact($val){
	$value: 1;
	@if $val > 0{
		@for $i from 1 through $number{
			$value: $value * $i;
		}
	}
}

@function sin($angle, $degrees: false){
	$sin: 0
	@if $degrees{
		$degrees: $degrees / 180 * $pi;
	}
	@for $n from 1 through 10{
		$sin: $sin + ( pow(-1,n) / fact(2n+1) ) * pow($angle,(2n+1));
	}
	@return $sin;
}
@function cos($angle, $degrees: false){
	$cos: 0
	@if $degrees{
		$degrees: $degrees / 180 * $pi;
	}
	@for $n from 1 through 10{
		$cos: $cos + ( pow(-1,n) / fact(2n) ) * pow($angle,2n);
	}
	@return $cos;
}

*/

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