Blob Firefly in a Jar effect :: RV's free Javascript and DHTML graphics scripts

BLOBS (or FIREFLIES) IN A JAR

This script has been tested on and shown to work with the following browsers: Internet Explorer version 10 and above Google Chrome version 4 and above Mozilla Firefox version 3 and above Apple Safari version 5 and above Opera version 10 and above

23-Jul-2020: Support for Internet Explorer versions lower than 10 removed. Change to using CSS 'blur'. Blobs now try to avoid each other and avoid the mouse, unless they are mating! 11-Jun-2013:Internet Explorer support improved. 02-Jan-2012: First release.
STEP 1: Copy and paste the code below so that it sits between the <head> and </head> tags at the top of your web-page: <script type="text/javascript"> // <![CDATA[ var colours=new Array("#93f", "#3f9", "#f39", "#39f", "#9f3"); // what colour are the blobs var speed=50; // speed of animation, lower is faster var blobs=30; // how many blobs are in the jar var size=80; // maximum blob size /**************************\ Blobs in a Jar Effect * (c)2012-20 mf2fm web-design * http://www.mf2fm.com/rv * * DON'T EDIT BELOW THIS BOX * \**************************/ var div; var xpos=new Array(); var ypos=new Array(); var zpos=new Array(); var dx=new Array(); var dy=new Array(); var dz=new Array(); var blob=new Array(); var swide=800; var sleft=0; var shigh=600; var sdown=0; var x=400; var y=300; function addLoadEvent(funky) { var oldonload=window.onload; if (typeof(oldonload)!='function') window.onload=funky; else window.onload=function() { if (oldonload) oldonload(); funky(); } } addLoadEvent(fill_the_jar); function fill_the_jar() { var i, dvs; div=document.createElement('div'); dvs=div.style; dvs.position='fixed'; dvs.left='0px'; dvs.top='0px'; dvs.width='1px'; dvs.height='1px'; document.body.appendChild(div); set_scroll(); set_width(); for (i=0; i<blobs; i++) { add_blob(i); jamjar(i); } } function add_blob(ref) { var dv, sy; dv=document.createElement('div'); sy=dv.style; sy.width=size/2+"px"; sy.height=size/2+"px"; sy.borderRadius="50%"; sy.position='absolute'; sy.backgroundColor=colours[ref%colours.length]; do { ypos[ref]=Math.floor(shighMath.random()); xpos[ref]=Math.floor(swideMath.random()); } while (checkity(ref)); zpos[ref]=Math.random()size/4; dy[ref]=(0.5+Math.random())(Math.random()>.5?2:-2); dx[ref]=(0.5+Math.random())(Math.random()>.5?2:-2); dz[ref]=(0.5+Math.random())(Math.random()>.5?.2:-.2); blob[ref]=dv; div.appendChild(blob[ref]); set_blob(ref); } function checkity(j) { var i, r=false; if (j) for (var i=0; i<j; i++) { if (Math.abs(xpos[i]-xpos[j])<size && Math.abs(ypos[i]-ypos[j])<size) r=true; } return (r); } function rejig(ref, xy) { if (xy=='y') { dx[ref]=(0.5+Math.random())sign(dx[ref]); dy[ref]=(0.5+Math.random())-sign(dy[ref]); } else { dx[ref]=(0.5+Math.random())-sign(dx[ref]); dy[ref]=(0.5+Math.random())*sign(dy[ref]); } } function sign(a) { if (a<0) return (-2); else if (a>0) return (2); else return (0); } function set_blob(ref) { var sy; sy=blob[ref].style; sy.top=ypos[ref]-size/4+'px'; sy.left=xpos[ref]-size/4+'px'; sy.filter='blur('+zpos[ref]+'px)'; } function jamjar(ref) { var i; if (ypos[ref]+dy[ref]<-size/2 \|\| ypos[ref]+dy[ref]>shigh+size/2) rejig(ref, 'y'); else if (xpos[ref]+dx[ref]<-size/2 \|\| xpos[ref]+dx[ref]>swide+size/2) rejig(ref, 'x'); else if (Math.abs(ypos[ref]+dy[ref]-y)<size/2 && Math.abs(xpos[ref]+dx[ref]-x)<size/2 && zpos[ref]<size/20) { if (Math.abs(ypos[ref]+dy[ref]-y)>Math.abs(xpos[ref]+dx[ref]-x)) dy[ref]=-dy[ref]; else dx[ref]=-dx[ref]; } else for (i=0; i<blobs; i++) { if (i==ref) continue; if (Math.abs(ypos[ref]+dy[ref]-ypos[i])<size/2 && Math.abs(xpos[ref]+dx[ref]-xpos[i])<size/2 && Math.abs(zpos[ref]-zpos[i])<size/20) { if (Math.abs(ypos[ref]+dy[ref]-ypos[i])>Math.abs(xpos[ref]+dx[ref]-xpos[i])) dy[ref]=-dy[ref]; else dx[ref]=-dx[ref]; } } ypos[ref]+=dy[ref]; xpos[ref]+=dx[ref]; if (zpos[ref]+dz[ref]<0) dz[ref]=Math.abs(dz[ref]); else if (zpos[ref]+dz[ref]>size/4) dz[ref]=-Math.abs(dz[ref]); zpos[ref]+=dz[ref]; set_blob(ref); setTimeout("jamjar("+ref+")", speed); } 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; } } document.onscroll=set_scroll; function set_scroll() { if (typeof(self.pageYOffset)=="number") { sdown=self.pageYOffset; sleft=self.pageXOffset; } else if (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)!="undefined" && 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; } // ]]> </script> CLICK HERE to select all the above text
STEP 2: Change the colour (and other parameters) at the start of the script you just copied to the settings you require.
THAT'S IT When your page loads, blobs (or fireflies) will dart around your screen as if you had put them in a jar and screwed down the lid. For a firefly, try making the colour yellow and the blob into a '*'.

Copyright notice: All scripts are © copyright mf2fm.com. You can use them wherever and whenever you wish, however the copyright notice at the start of the script should remain intact and a link back to this page would be appreciated. The address for this page is: http://www.mf2fm.com/rv/dhtmlblobs-in-a-jar.php.

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