JS1k: The JavaScript code golfing competition

with(document.body.style){padding=margin=0;overflow="hidden"}c=document.getElementById("c");w=c.width=this.innerWidth;h=c.height=this.innerHeight;var g=c.getContext("2d");l=[];function r(b){return Math.random()*b-b/2}for(var i=0;i++<999;){cw=r(w);ch=r(h);l.push([cw,ch,cw+r(20),ch+r(20),cw+r(99),ch+r(99)])}colors=[0,255,0];t=1;
rd=function(){g.fillStyle="#000";g.fillRect(0,0,w,h);g.strokeStyle="#aa0";g.lineWidth=1;i=5;if(colors[t]>i-1){colors[t]-=i;colors[(t+1)%3]+=i}else turn=(t+1)%3;ss="rgba("+colors.join(",")+",";g.translate(w/2,h/2);for(i in l){m=l[i];dx=x-m[0];dy=y-m[1];d=Math.sqrt(dx*dx+dy*dy);a=75/d;a=a>0.75?0.75:a;if(!(a<0.15)){g.strokeStyle=ss+a+")";if(a>0.6&&r(4)<-1.9)m[6]=1;if(m[6]>0){m[6]-=0.05;g.strokeStyle="rgba(255,255,255,"+m[6]+")"}g.beginPath();g.moveTo(m[0],m[1]);g.quadraticCurveTo(m[2]-dx/d*20,m[3]-dx/
d*20,m[4]-dx/d*80,m[5]-dy/d*80);g.stroke()}}g.translate(-w/2,-h/2)};document.body.onmousemove=function(b){x=b.clientX-w/2;y=b.clientY-h/2;rd()};

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

with(document.body.style){padding=margin=0;overflow='hidden'};
      c=document.getElementById('c');
      w = c.width = this.innerWidth;
      h = c.height = this.innerHeight;
      
      var g = c.getContext('2d');  
      
      l = []
      
      function r(w) {return Math.random()*w-w/2}
      
      for (var i = 0; i++ < 999;) {
        cw = r(w);
        ch = r(h);
        l.push([cw, ch, cw+r(20), ch+r(20), cw+r(99), ch+r(99)]);
      }
      
      colors = [0, 255, 0];      
      t = 1;
      
      rd=function() {
        g.fillStyle = '#000';
        g.fillRect(0,0, w, h);

        g.strokeStyle = '#aa0';
        g.lineWidth = 1;

        i = 5;

        if (colors[t] > i-1) {
          colors[t] -= i;
          colors[(t+1)%3] += i;
        } else {
          turn=(t+1)%3;
        }

        //g.strokeStyle = 'rgb('+colors.join(',')+')';
        ss = 'rgba('+colors.join(',')+',';

        
        g.translate(w/2, h/2); 
        for (i in l) {
          m = l[i];
          dx = x-m[0];
          dy = y-m[1];
          d = Math.sqrt(dx*dx+dy*dy);

          a = 75/d;
          
          a = a > 0.75 ? 0.750 : a;

          if (a < 0.15) {continue}

          g.strokeStyle = ss+(a)+')';
          
          if (a > 0.6 && r(4)<-1.9) {
            m[6] = 1;
          }
          if (m[6]>0) {
            m[6] -= 0.05;
            g.strokeStyle = 'rgba(255,255,255,'+m[6]+')';
          }
         
          g.beginPath();  
          g.moveTo(m[0], m[1]);          
          g.quadraticCurveTo(
            m[2]-(dx/d)*20, 
            m[3]-(dx/d)*20, 
            m[4]-(dx/d)*80, 
            m[5]-(dy/d)*80
          );
          g.stroke();
        }
        g.translate(-w/2, -h/2);
      }
            
      document.body.onmousemove = function(e) {
        x = e.clientX-w/2;
        y = e.clientY-h/2;
        rd()
      }