var users=new Array;
var animating=false;
var curTsL=0,curTsR=0;
var tarTsL=4294967296,tarTsR=0;
var curRtL=0,curRtR=0;
var tarRtL=9999,tarRtR=0;
var ctx;
var w,h;
var ratings=[0,1200,1400,1600,1900,2200,2300,2400,2600,2900,9999];
var ratingbg=["rgba(128,128,128,0.6)","rgba(0,255,0,0.6)","rgba(3,168,158,0.6)","rgba(0,0,255,0.6)","rgba(160,0,160,0.6)","rgba(255,140,0,0.6)","rgba(255,140,0,0.6)","rgba(255,0,0,0.6)","rgba(224,0,0,0.6)","rgba(204,0,0,0.6)"];
function init()
{
ctx=document.getElementById("cvs").getContext("2d");
w=document.getElementById("cvs").width;
h=document.getElementById("cvs").height;
}
function min(a,b){return a<b?a:b;}
function max(a,b){return a>b?a:b;}
function randomColor(a)
{
var h=Math.floor(Math.random()*30)*12;
return "hsla("+h+",90%,45%,"+a+")";
}
function add()
{
if(animating)return;
var req=new XMLHttpRequest();
req.onload=function(){
var r=JSON.parse(req.responseText);
if(r.status!=="OK")return;
if(!Array.isArray(r.result)||r.result.length==0)return;
r.maxr=0;r.minr=9999;r.maxt=0;r.mint=4294967296;r.selected=false;
r.color=randomColor(0.8);r.pendingremove=false;r.bold=false;
if(tarTsL==0)tarTsL=4294967296;
for(var i=0;i<r.result.length;++i)
{
r.result[i].drawRating=0;
r.maxr=max(r.maxr,r.result[i].newRating+200);
r.minr=min(r.minr,r.result[i].newRating-200);
r.maxt=max(r.maxt,r.result[i].ratingUpdateTimeSeconds);
r.mint=min(r.mint,r.result[i].ratingUpdateTimeSeconds);
}
tarRtL=min(tarRtL,r.minr);tarRtR=max(tarRtR,r.maxr);
tarTsL=min(tarTsL,r.mint);tarTsR=max(tarTsR,r.maxt);
users.push(r);
var o=document.createElement("div");
o.userid=users.length-1;
o.textContent=document.getElementById("name").value;
o.classList.add("s");
o.style.backgroundColor=r.color;
o.onclick=function(){this.classList.toggle("selected");}
o.onmouseenter=function(){highlight(this.userid,true);}
o.onmouseleave=function(){highlight(this.userid,false);}
document.getElementById("users").appendChild(o);
animating=true;
window.requestAnimationFrame(update);
}
req.open("GET","http://codeforces.com/api/user.rating?handle="+document.getElementById("name").value);
req.send();
}
function remove()
{
if(animating)return;
for(var i=0;i<document.getElementById("users").childNodes.length;++i)
if(document.getElementById("users").childNodes[i].classList.contains("selected"))
users[i].pendingremove=true;
for(var i=0;i<document.getElementById("users").childNodes.length;++i)
if(document.getElementById("users").childNodes[i].classList.contains("selected"))
{document.getElementById("users").removeChild(document.getElementById("users").childNodes[i]);--i;}
tarRtL=9999,tarRtR=0;
tarTsL=4294967296,tarTsR=0;
for(var i=0;i<users.length;++i)
{
if(users[i].pendingremove)continue;
tarRtL=min(tarRtL,users[i].minr);tarRtR=max(tarRtR,users[i].maxr);
tarTsL=min(tarTsL,users[i].mint);tarTsR=max(tarTsR,users[i].maxt);
}
if(tarRtL>tarRtR)tarRtR=1900,tarRtL=1000;
if(tarTsL>tarTsR)tarTsL=tarTsR=0;
animating=true;
window.requestAnimationFrame(update);
}
function morph(a,b,s)
{
var ret=a;if(Math.abs(a-b)>s)
ret+=s*(b-a)/Math.abs(a-b);
else ret=b;return ret;
}
function interpolate(a,b,c,d,x)
{
var A=(d-c)/(b-a),B=c-a*A;
return A*x+B;
}
function highlight(n,s)
{
users[n].bold=s;window.requestAnimationFrame(update);
}
function update()
{
var f=false;
if(curTsL===0&&curTsR===0)
{curTsL=tarTsL;curTsR=tarTsR;f=(tarTsL||tarTsR);}
else
{
f|=Math.abs(curTsL-tarTsL)>432000;
f|=Math.abs(curTsR-tarTsR)>432000;
curTsL=morph(curTsL,tarTsL,max(Math.abs(curTsL-tarTsL)/5,432000));
curTsR=morph(curTsR,tarTsR,max(Math.abs(curTsR-tarTsR)/5,432000));
}
if(curRtL===0&&curRtR===0)
{curRtL=tarRtL;curRtR=tarRtR;f=true;}
else
{
f|=Math.abs(curRtL-tarRtL)>10;
f|=Math.abs(curRtR-tarRtR)>10;
curRtL=morph(curRtL,tarRtL,max(Math.abs(curRtL-tarRtL)/5,10));
curRtR=morph(curRtR,tarRtR,max(Math.abs(curRtR-tarRtR)/5,10));
}
ctx.clearRect(0,0,w,h);
for(var i=0;i<ratings.length-1;++i)
{
ctx.fillStyle=ratingbg[i];
ctx.fillRect(0,interpolate(curRtL,curRtR,h,0,ratings[i+1]),w,interpolate(curRtL,curRtR,h,0,ratings[i])-interpolate(curRtL,curRtR,h,0,ratings[i+1]));
}
for(var i=0;i<users.length;++i)
{
if(users[i].pendingremove)
{
var j;
for(j=users[i].result.length-1;j>=0;--j)
{
if(users[i].result[j].drawRating<tarRtL){users[i].result[j].drawRating=0;f=true;}
else if(users[i].result[j].drawRating-(max(tarRtR,users[i].result[j].newRating)-tarRtL)/20>tarRtL){users[i].result[j].drawRating-=(max(tarRtR,users[i].result[j].newRating)-tarRtL)/20;f=true;}
else{users[i].result[j].drawRating=0;}
if(users[i].result[j].drawRating>users[i].result[j].newRating*0.8)break;
}
if(j==-1){users.splice(i,1);--i;continue;}
for(j=users[i].result.length-1;j>=0;--j)
if(users[i].result[j].ratingUpdateTimeSeconds<tarTsL&&users[i].result[j].drawRating===0){users.splice(i,1);--i;j=-2;break;}
if(j==-2)continue;
}
else for(var j=0;j<users[i].result.length;++j)
{
if(users[i].result[j].drawRating<tarRtL){users[i].result[j].drawRating=tarRtL;f=true;break;}
else if(users[i].result[j].drawRating+(tarRtR-tarRtL)/30<users[i].result[j].newRating){users[i].result[j].drawRating+=(tarRtR-tarRtL)/30;f=true;
if(users[i].result[j].drawRating<users[i].result[j].newRating*0.6)break;}
else users[i].result[j].drawRating=users[i].result[j].newRating;
}
ctx.strokeStyle=users[i].color;
ctx.lineWidth=users[i].bold?4:2;
ctx.beginPath();
ctx.moveTo(interpolate(curTsL,curTsR,0,w,users[i].result[0].ratingUpdateTimeSeconds),
min(interpolate(curRtL,curRtR,h,0,users[i].result[0].drawRating),h+10));
for(var j=1;j<users[i].result.length;++j)
ctx.lineTo(interpolate(curTsL,curTsR,0,w,users[i].result[j].ratingUpdateTimeSeconds),
min(interpolate(curRtL,curRtR,h,0,users[i].result[j].drawRating),h+10));
ctx.stroke();
ctx.fillStyle=users[i].color;
for(var j=0;j<users[i].result.length;++j)
{
ctx.beginPath();
ctx.arc(interpolate(curTsL,curTsR,0,w,users[i].result[j].ratingUpdateTimeSeconds),
min(interpolate(curRtL,curRtR,h,0,users[i].result[j].drawRating),h+10),users[i].bold?5:3,0,2*Math.PI);
ctx.fill();
}
}
if(f)window.requestAnimationFrame(update);else animating=false;
}
