Created
October 31, 2015 22:19
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<!DOCTYPE html> | |
<style> | |
/* Colors */ | |
#container{ | |
width:100%; | |
height:100%; | |
} | |
img.drag { | |
position: absolute; | |
opacity:-1; | |
height:50%; | |
transition:opacity 1s; | |
} | |
div.bg { | |
width:100%; | |
height:100%; | |
position:fixed; | |
top:0; | |
left:0; | |
background-repeat: repeat; | |
} | |
#day { | |
animation: mymove 4s linear infinite; | |
} | |
@keyframes mymove { | |
0% { background-position: 0 0; } | |
50% { background-position: 40% 0; } | |
} | |
</style> | |
<html> | |
<body> | |
<div id="container"> | |
<div class="bg" id="night" style="background-image:url(http://i.imgur.com/JK3hIxi.gif);"></div> | |
<img class="drag" id="moon" src="http://i.imgur.com/VmFEwrH.png"> | |
<div class="bg" id="evening" style="background-image:url(http://i.imgur.com/YHHa2St.jpg)"></div> | |
<img class="drag" id="dark_sun" src="http://i.imgur.com/f3UFHb7.png"> | |
<div class="bg" id="day" style="background-image:url(http://i.imgur.com/aZty7Mq.png)"></div> | |
<img class="drag" id="sun" src="http://i.imgur.com/DGkZYZQ.png"> | |
</div> | |
<script src="//code.jquery.com/jquery-1.10.2.js"></script> | |
<script src="//code.jquery.com/ui/1.11.4/jquery-ui.js"></script> | |
</body> | |
<script> | |
$(function(){ | |
var bg = $(".bg"), | |
drag = $(".drag"), | |
sun = $("#sun"), | |
csel = '#container'; // container selector | |
_init(); | |
// hoistorzs | |
function _init(){ | |
onDrag(); | |
sun.css({ | |
opacity:1 | |
}) | |
.draggable({ | |
axis: "x", | |
containment: csel, | |
drag:onDrag | |
}); | |
} | |
function getOpacity(Z,index){ | |
Z = 1 - Math.min(Math.max(0,Z),1); // guarantee 0 < x < 1 | |
var len = bg.length; | |
var A = 1, | |
P = 1, | |
V = -A + 1, | |
x = 0, // we need y at x=zero | |
L = len - 1, // resolves fencepost error calculating arc indices | |
opacity = A*Math.cos(P*0 + Z*Math.PI - (index*Math.PI)/L) + V; // 0-1; | |
return opacity; | |
} | |
function onDrag(){ | |
var len = bg.length, | |
total = $(csel).width(), | |
min=sun.width()/2+8, | |
max=total-min, | |
x = sun.offset().left + (min), | |
p = (x-min)/(max-min), | |
w = sun.width(), | |
heightPct = Math.pow((total >> 1) - x, 2) / Math.pow(total >> 1, 2), | |
rounded = Math.round(heightPct * 30) + "%"; | |
bg.each(function(i){ | |
var op = getOpacity(p,i); | |
$(this).css({ | |
opacity:op | |
}); | |
}); | |
drag.each(function(i){ | |
var op = getOpacity(p,i); | |
$(this).css({ | |
opacity:op > .5 ? 1 : 0, | |
left: sun.css("left"), | |
top: sun.css("top"), | |
marginTop: rounded | |
}); | |
}) | |
} | |
}) | |
</script> | |
</html> |
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