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Direction-aware 3D hover effect

After seeing this site http://fitzfitzpatrick.com/ I decided to give a try to the "direction-aware hover effect". My first thought was to do it with a pure CSS, not too late I changed my mind and decided to use JS (I need to sleep anyway).

It's kind of simple, using JS we can easily detect the direction the cursor is coming, then, I am using CSS animations for each case (8 in total).

A Pen by Noel Delgado on CodePen.

License.

%header
.container
%h1 Direction-aware hover effect
%p CSS & bits of JS
.container
%ul
- 12.times do
%li
%a{:href => "#", :class => "normal"}
%svg{:viewBox => "0 0 80 76", :x => "0px", :y => "0px"}
%g
%path{:d => "M 68.9708 24.8623 L 60.4554 2.3018 C 59.9641 0.7017 58.1628 -0.2583 56.5252 0.3817 L 1.9822 20.2222 C 0.3822 20.7022 -0.4179 22.6222 0.2222 24.2223 L 8.8624 47.7797 L 8.8624 35.1484 C 8.8624 29.5024 13.3425 24.8623 18.8857 24.8623 L 32.9442 24.8623 L 50.63 12.862 L 60.7829 24.8623 L 68.9708 24.8623 L 68.9708 24.8623 ZM 77.098 32.0625 L 18.8857 32.0625 C 17.2512 32.0625 16.0625 33.4511 16.0625 35.1484 L 16.0625 72.8491 C 16.0625 74.5477 17.2512 75.9375 18.8857 75.9375 L 77.098 75.9375 C 78.742 75.9375 79.9376 74.5477 79.9376 72.8491 L 79.9376 35.1484 C 79.9376 33.4511 78.742 32.0625 77.098 32.0625 L 77.098 32.0625 ZM 73.0626 68.0625 L 23.9375 68.0625 L 23.9375 61.0852 L 31.4704 43.7232 L 42.7696 57.6777 L 53.4138 46.8062 L 67.1695 41.9375 L 73.0626 55.0815 L 73.0626 68.0625 L 73.0626 68.0625 Z"}
.info
%h3 Single-origin coffee whatever
%p Williamsburg tofu polaroid, 90's Bushwick irony locavore ethnic meh messenger bag Truffaut jean shorts.
// - Noel Delgado | @pixelia_me
var nodes = document.querySelectorAll('li'),
_nodes = [].slice.call(nodes, 0);
var getDirection = function (ev, obj) {
var w = obj.offsetWidth,
h = obj.offsetHeight,
x = (ev.pageX - obj.offsetLeft - (w / 2) * (w > h ? (h / w) : 1)),
y = (ev.pageY - obj.offsetTop - (h / 2) * (h > w ? (w / h) : 1)),
d = Math.round( Math.atan2(y, x) / 1.57079633 + 5 ) % 4;
return d;
};
var addClass = function ( ev, obj, state ) {
var direction = getDirection( ev, obj ),
class_suffix = "";
obj.className = "";
switch ( direction ) {
case 0 : class_suffix = '-top'; break;
case 1 : class_suffix = '-right'; break;
case 2 : class_suffix = '-bottom'; break;
case 3 : class_suffix = '-left'; break;
}
obj.classList.add( state + class_suffix );
};
// bind events
_nodes.forEach(function (el) {
el.addEventListener('mouseover', function (ev) {
addClass( ev, this, 'in' );
}, false);
el.addEventListener('mouseout', function (ev) {
addClass( ev, this, 'out' );
}, false);
});
@import "compass";
@import url(http://fonts.googleapis.com/css?family=Bree+Serif);
$w: 200;
$h: 180;
$duration: 300ms;
$timing-fn: ease;
$turquoise: #1ABC9C;
$wet-asphalt: #34495E;
$midnight-blue: #2C3E50;
$clouds: #ECF0F1;
* {box-sizing: border-box}
body {background-color: #fff}
h1 {
margin: 0 auto 5px;
text-align: center;
}
h3 {font-family: 'Bree Serif', serif}
.container {
width: 840px;
margin: 0 auto;
}
header {
font-family: 'Bree Serif', serif;
text-align: center;
margin: 50px 0 25px;
color: $wet-asphalt;
p {
margin: 0;
color: transparentize($wet-asphalt, .6);
}
}
ul {
padding: 0;
margin: 0 0 50px;
&:after {
content: ".";
display: block;
clear: both;
visibility: hidden;
line-height: 0;
height: 0;
}
}
li {
position: relative;
overflow: hidden;
border-radius: 4px;
list-style: none;
float: left;
width: #{$w}px;
height: #{$h}px;
margin: 5px;
padding: 0;
perspective: 500px;
a {
display: inline-block;
vertical-align: top;
text-decoration: none;
border-radius: 4px;
}
h3 {
margin: 0;
font-size: 16px;
color: transparentize(#fff, .1);
}
p {
font-size: 12px;
line-height: 1.5;
color: transparentize(#fff, .2);
}
.normal {
width: 100%;
height: 100%;
background-color: $clouds;
color: transparentize($wet-asphalt, .4);
box-shadow: inset 0 2px 20px darken($clouds, 2);
text-align: center;
font-size: 50px;
line-height: #{$h}px;
svg {
pointer-events: none;
width: 50px;
path {
fill: transparentize($wet-asphalt, .8);
}
}
}
.info {
width: 100%;
height: 100%;
padding: 20px;
position: absolute;
top: 0;
left: 0;
overflow: hidden;
border-radius: 4px;
pointer-events: none;
background-color: transparentize($turquoise, .1);
transform: rotate3d(1, 0, 0, 90deg);
}
}
.in-top .info {
transform-origin: 50% 0%;
animation: in-top $duration $timing-fn 0ms 1 forwards;
}
.in-right .info {
transform-origin: 100% 0%;
animation: in-right $duration $timing-fn 0ms 1 forwards;
}
.in-bottom .info {
transform-origin: 50% 100%;
animation: in-bottom $duration $timing-fn 0ms 1 forwards;
}
.in-left .info {
transform-origin: 0% 0%;
animation: in-left $duration $timing-fn 0ms 1 forwards;
}
.out-top .info {
transform-origin: 50% 0%;
animation: out-top $duration $timing-fn 0ms 1 forwards;
}
.out-right .info {
transform-origin: 100% 50%;
animation: out-right $duration $timing-fn 0ms 1 forwards;
}
.out-bottom .info {
transform-origin: 50% 100%;
animation: out-bottom $duration $timing-fn 0ms 1 forwards;
}
.out-left .info {
transform-origin: 0% 0%;
animation: out-left $duration $timing-fn 0ms 1 forwards;
}
@keyframes in-top {
from {transform: rotate3d(-1, 0, 0, 90deg);}
to {transform: rotate3d(0, 0, 0, 0deg);}}
@keyframes in-right {
from {transform: rotate3d(0, -1, 0, 90deg);}
to {transform: rotate3d(0, 0, 0, 0deg);}}
@keyframes in-bottom {
from {transform: rotate3d(1, 0, 0, 90deg);}
to {transform: rotate3d(0, 0, 0, 0deg);}}
@keyframes in-left {
from {transform: rotate3d(0, 1, 0, 90deg);}
to {transform: rotate3d(0, 0, 0, 0deg);}}
@keyframes out-top {
from {transform: rotate3d(0, 0, 0, 0deg);}
to {transform: rotate3d(-1, 0, 0, 102deg);}}
@keyframes out-right {
from {transform: rotate3d(0, 0, 0, 0deg);}
to {transform: rotate3d(0, -1, 0, 102deg);}}
@keyframes out-bottom {
from {transform: rotate3d(0, 0, 0, 0deg);}
to {transform: rotate3d(1, 0, 0, 101deg);}}
@keyframes out-left {
from {transform: rotate3d(0, 0, 0, 0deg);}
to {transform: rotate3d(0, 1, 0, 102deg);}}
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