Created
September 19, 2017 06:19
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// <![CDATA[ | |
var colour="random"; // in addition to "random" can be set to any valid colour eg "#f0f" or "red" | |
var sparkles=50; | |
var x=ox=400; | |
var y=oy=300; | |
var swide=800; | |
var shigh=600; | |
var sleft=sdown=0; | |
var tiny=new Array(); | |
var star=new Array(); | |
var starv=new Array(); | |
var starx=new Array(); | |
var stary=new Array(); | |
var tinyx=new Array(); | |
var tinyy=new Array(); | |
var tinyv=new Array(); | |
window.onload=function() { if (document.getElementById) { | |
var i, rats, rlef, rdow; | |
for (var i=0; i<sparkles; i++) { | |
var rats=createDiv(3, 3); | |
rats.style.visibility="hidden"; | |
rats.style.zIndex="999"; | |
document.body.appendChild(tiny[i]=rats); | |
starv[i]=0; | |
tinyv[i]=0; | |
var rats=createDiv(5, 5); | |
rats.style.backgroundColor="transparent"; | |
rats.style.visibility="hidden"; | |
rats.style.zIndex="999"; | |
var rlef=createDiv(1, 5); | |
var rdow=createDiv(5, 1); | |
rats.appendChild(rlef); | |
rats.appendChild(rdow); | |
rlef.style.top="2px"; | |
rlef.style.left="0px"; | |
rdow.style.top="0px"; | |
rdow.style.left="2px"; | |
document.body.appendChild(star[i]=rats); | |
} | |
set_width(); | |
sparkle(); | |
}} | |
function sparkle() { | |
var c; | |
if (Math.abs(x-ox)>1 || Math.abs(y-oy)>1) { | |
ox=x; | |
oy=y; | |
for (c=0; c<sparkles; c++) if (!starv[c]) { | |
star[c].style.left=(starx[c]=x)+"px"; | |
star[c].style.top=(stary[c]=y+1)+"px"; | |
star[c].style.clip="rect(0px, 5px, 5px, 0px)"; | |
star[c].childNodes[0].style.backgroundColor=star[c].childNodes[1].style.backgroundColor=(colour=="random")?newColour():colour; | |
star[c].style.visibility="visible"; | |
starv[c]=50; | |
break; | |
} | |
} | |
for (c=0; c<sparkles; c++) { | |
if (starv[c]) update_star(c); | |
if (tinyv[c]) update_tiny(c); | |
} | |
setTimeout("sparkle()", 40); | |
} | |
function update_star(i) { | |
if (--starv[i]==25) star[i].style.clip="rect(1px, 4px, 4px, 1px)"; | |
if (starv[i]) { | |
stary[i]+=1+Math.random()*3; | |
starx[i]+=(i%5-2)/5; | |
if (stary[i]<shigh+sdown) { | |
star[i].style.top=stary[i]+"px"; | |
star[i].style.left=starx[i]+"px"; | |
} | |
else { | |
star[i].style.visibility="hidden"; | |
starv[i]=0; | |
return; | |
} | |
} | |
else { | |
tinyv[i]=50; | |
tiny[i].style.top=(tinyy[i]=stary[i])+"px"; | |
tiny[i].style.left=(tinyx[i]=starx[i])+"px"; | |
tiny[i].style.width="2px"; | |
tiny[i].style.height="2px"; | |
tiny[i].style.backgroundColor=star[i].childNodes[0].style.backgroundColor; | |
star[i].style.visibility="hidden"; | |
tiny[i].style.visibility="visible" | |
} | |
} | |
function update_tiny(i) { | |
if (--tinyv[i]==25) { | |
tiny[i].style.width="1px"; | |
tiny[i].style.height="1px"; | |
} | |
if (tinyv[i]) { | |
tinyy[i]+=1+Math.random()*3; | |
tinyx[i]+=(i%5-2)/5; | |
if (tinyy[i]<shigh+sdown) { | |
tiny[i].style.top=tinyy[i]+"px"; | |
tiny[i].style.left=tinyx[i]+"px"; | |
} | |
else { | |
tiny[i].style.visibility="hidden"; | |
tinyv[i]=0; | |
return; | |
} | |
} | |
else tiny[i].style.visibility="hidden"; | |
} | |
document.onmousemove=mouse; | |
function mouse(e) { | |
if (e) { | |
y=e.pageY; | |
x=e.pageX; | |
} | |
else { | |
set_scroll(); | |
y=event.y+sdown; | |
x=event.x+sleft; | |
} | |
} | |
window.onscroll=set_scroll; | |
function set_scroll() { | |
if (typeof(self.pageYOffset)=='number') { | |
sdown=self.pageYOffset; | |
sleft=self.pageXOffset; | |
} | |
else if (document.body && (document.body.scrollTop || document.body.scrollLeft)) { | |
sdown=document.body.scrollTop; | |
sleft=document.body.scrollLeft; | |
} | |
else if (document.documentElement && (document.documentElement.scrollTop || document.documentElement.scrollLeft)) { | |
sleft=document.documentElement.scrollLeft; | |
sdown=document.documentElement.scrollTop; | |
} | |
else { | |
sdown=0; | |
sleft=0; | |
} | |
} | |
window.onresize=set_width; | |
function set_width() { | |
var sw_min=999999; | |
var sh_min=999999; | |
if (document.documentElement && document.documentElement.clientWidth) { | |
if (document.documentElement.clientWidth>0) sw_min=document.documentElement.clientWidth; | |
if (document.documentElement.clientHeight>0) sh_min=document.documentElement.clientHeight; | |
} | |
if (typeof(self.innerWidth)=='number' && self.innerWidth) { | |
if (self.innerWidth>0 && self.innerWidth<sw_min) sw_min=self.innerWidth; | |
if (self.innerHeight>0 && self.innerHeight<sh_min) sh_min=self.innerHeight; | |
} | |
if (document.body.clientWidth) { | |
if (document.body.clientWidth>0 && document.body.clientWidth<sw_min) sw_min=document.body.clientWidth; | |
if (document.body.clientHeight>0 && document.body.clientHeight<sh_min) sh_min=document.body.clientHeight; | |
} | |
if (sw_min==999999 || sh_min==999999) { | |
sw_min=800; | |
sh_min=600; | |
} | |
swide=sw_min; | |
shigh=sh_min; | |
} | |
function createDiv(height, width) { | |
var div=document.createElement("div"); | |
div.style.position="absolute"; | |
div.style.height=height+"px"; | |
div.style.width=width+"px"; | |
div.style.overflow="hidden"; | |
return (div); | |
} | |
function newColour() { | |
var c=new Array(); | |
c[0]=255; | |
c[1]=Math.floor(Math.random()*256); | |
c[2]=Math.floor(Math.random()*(256-c[1]/2)); | |
c.sort(function(){return (0.5 - Math.random());}); | |
return ("rgb("+c[0]+", "+c[1]+", "+c[2]+")"); | |
} | |
// ]]> |
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