compressed.js

with(document.body.style){padding=margin=0;overflow="hidden"}c=document.getElementById("c");w=c.width=this.innerWidth;h=c.height=this.innerHeight;g=c.getContext("2d");l=[];function r(b){return Math.random()*b}for(t=i=1;i++<999;)l.push([n=r(w),m=r(h),n+r(20)-9,m+r(20)-9,n+r(99)-50,m+r(99)-50]);k=[0,255,0];j=5;document.body.onmousemove=function(b){g.fillStyle="#000";g.fillRect(0,0,w,h);if(k[t]>=j){k[t]-=j;k[(t+1)%3]+=j}else t=(t+1)%3;o="rgba("+k.join(",")+",";for(i in l){m=l[i];dx=b.clientX-m[0];dy=b.clientY-m[1];d=Math.sqrt(dx*dx+dy*dy);a=75/d;if(!(a<0.15)){g.strokeStyle=o+a+")";if(a>0.6&&r(99)<3)m.g=1;if(m.g>0)g.strokeStyle="rgba(255,255,255,"+(m.g-=0.05)+")";g.beginPath();g.moveTo(m[0],m[1]);g.quadraticCurveTo(m[2]-dx/d*20,m[3]-dy/d*20,m[4]-dx/d*80,m[5]-dy/d*80);g.stroke()}}}

source.js

      with(document.body.style){padding=margin=0;overflow='hidden'};
      c=document.getElementById('c');
      w = c.width = this.innerWidth;
      h = c.height = this.innerHeight;
      g = c.getContext('2d');  
      
      l = []
      
      function r(w) {return Math.random()*w}
      
      t = i = 1;

      while (i++ < 999) {
        l.push([n = r(w), m = r(h), n+r(20)-9, m+r(20)-9, n+r(99)-50, m+r(99)-50]);
      }
      
      k = [0, 255, 0];      
      j = 5;
   
      document.body.onmousemove = function(e) {
        g.fillStyle = '#000';
        g.fillRect(0,0, w, h);

        if (k[t] >= j) {
          k[t] -= j;
          k[(t+1)%3] += j;
        } else {
          t=(t+1)%3;
        }

        o = 'rgba('+k.join(',')+',';
        
        for (i in l) {
          m = l[i];
          dx = e.clientX-m[0];
          dy = e.clientY-m[1];
          d = Math.sqrt(dx*dx+dy*dy);

          a = 75/d;

          if (a < .15) continue;

          g.strokeStyle = o+(a)+')';
          
          if (a > 0.6 && r(99)<3) m.g = 1;
          if (m.g>0) {          
            g.strokeStyle = 'rgba(255,255,255,'+(m.g-=.05)+')'
          }
         
          g.beginPath();
          g.moveTo(m[0], m[1]);          
          g.quadraticCurveTo(
            m[2]-dx/d*20, 
            m[3]-dy/d*20, 
            m[4]-dx/d*80, 
            m[5]-dy/d*80
          );
          g.stroke();
        }
      }