function h(d,f){return(d.c-f.c)*(d.c-f.c)+(d.d-f.d)*(d.d-f.d)<=(d.a+f.a)*(d.a+f.a)}C=255;b.style.margin=0;v={a:60};o=Math.sin;q=Math.cos;g=2*Math.PI;u=function(){return"#"+(16777215*Math.random()+"").slice(-6)};p=[{a:9,b:0,e:9,f:u(),g:1}];c.onmousedown=function(d){p.push({a:9,b:Math.atan2([Y=d.clientY]-T,[X=d.clientX]-S),e:Math.sqrt((X-S)*(X-S)+(Y-T)*(Y-T))/12,f:u(),g:1});60<=p.length&&p.shift()};for(z in a)a["_"+z[0]+(z[6]||"")]=a[z]; setInterval("with(a){dp=function(d){_ba();fillStyle=d.f;U=d.x=S+q(d.b)*[e=12*d.e];V=d.y=T+o(d.b)*e;d.b+=.008*v.a/d.e;d.c=U+q(d.b);d.d=V+o(d.b);_a(U,V,d.a,0,g,1);fill()};S=v.c=(W=c.width=b.clientWidth)/2;T=v.d=(H=c.height=window.innerHeight-5)/2;_fc(0,0,W,H);for(var d=1;4>=d;)_ba(),fillStyle='rgba(255,'+C+',0,'+.33*d+')',_a(S,T,v.a/(.99*d++),0,g,1),fill();M=p.length;for(d=0;d<M;d++){P=p[d];h(v,P)&&(v.a+=.2,C--,P.a-=2);for(j=d+1;j<p.length;j++)Q=p[j],h(P,Q)&&(P.a>=Q.a?P.a++&--Q.a:Q.a++& --P.a)}Z=[];for(d=0;d<M;d++)0<p[d].a&&Z.push(p[d]);p=Z;for(d=0;d<p.length;)dp(p[d++])}",40);
b.style.margin=0;
var removes;
var GreenSun=255;
var H,W,MW,MH;
var X,Y;
var sun ={r:60};
var planetMouse=null;
var points=[];
var mq=Math.sqrt;
var G=0.008;
var randomColor=function(){return '#'+ ((Math.random()*0xFFFFFF)+'').slice(-6);}
var np=function(){planetMouse.m=true;planets.push(planetMouse);planetMouse=null;}
var planets=[{r:9,x:0,y:0,d:0,l:9,m:true,c:randomColor(),re:false}];
var pr=[];
var alpha=0.33;
function pw(n){
return Math.pow(n,2)
}
//onmouseup event that puts a new planet in the stack
c.onmouseup=function(e){
X=e.clientX;
Y=e.clientY;
planetMouse={x:0,y:0,r:10,d:Math.atan2(Y-MH,X-MW),m:false,l:mq(pw(X-MW)+pw(Y-MH))/12,c:randomColor(),re:false};
np();
//60 limit planets
if(planets.length>=60)planets.shift();
};
//function that draws the star (SUN)
var createSun = function(color, r,H,W) {
//draw 3 layers
for(var i=1;i<=4;i++){
a.beginPath();
a.fillStyle = 'rgba(255,'+GreenSun+',0,'+alpha*i+')';
a.arc(W/2,H/2, r/(alpha*3*i), 0, 2 * Math.PI, true);
a.closePath();
a.fill();
}
}
//function that draws each of the planets
var drawPlanet = function(planet){
a.beginPath();
a.fillStyle = planet.c;
// get the position of the planet from the angle and distance
// if we change the size of the window positions and sizes are kept
planet.x = MW + Math.cos(planet.d)*planet.l*12;
planet.y = MH + Math.sin(planet.d)*planet.l*12;
planet.d+=planet.m?((G*sun.r)/planet.l):0;
planet.nextx = MW + Math.cos(planet.d)*planet.l*12;
planet.nexty = MH + Math.sin(planet.d)*planet.l*12;
if(planet.r>0){
a.arc(planet.x,planet.y, planet.r, 0, 2 * Math.PI, true);
}
a.fill();
}
setInterval(function(){
draw();
},40);
// detect collisions between planets and star
// to follow these rules
// Subtract star size planets
// The remaining larger size planets to smaller planets
// The planets with a radius less than or equal to 0 are added to the pile of elimination
function colision(){
var planet;
var cPlanet;
for(var i=0;i < planets.length;i++){
planet=planets[i];
if(detect(sun,planet)){
//modify the size and color of the star
planet.r--;
sun.r+=.1;
GreenSun--;
if(planet.r<=0){
pr.push(i);
}
}
for(var j=i+1;j<planets.length;j++){
cPlanet=planets[j];
if(detect(planet,cPlanet)){
if(planet.r>=cPlanet.r){
planet.r++;
cPlanet.r--;
if(cPlanet.r<=0){
pr.push(j);
}
}else{
planet.r--;
cPlanet.r++;
if(planet.r<=0){
pr.push(i);
}
}
}
}
}
//walk the array and store the planets with a radius greater than 0
removes=[];
for(var i=0;i<planets.length;i++){
if(planets[i].r>0){
removes.push(planets[i]);
}
}
planets=removes;
}
//funcion que detecta la colision entre dos cuerpos
function detect(planet1,planet2){
var dx = planet1.nextx - planet2.nextx;
var dy = planet1.nexty - planet2.nexty;
var distance =(dx*dx + dy*dy);
return(distance <= (planet1.r+planet2.r)*(planet1.r+planet2.r));
}
function draw(){
// canvas conforms to the size of the window
W = b.clientWidth;
H = window.innerHeight-5;
MW=sun.nextx=W/2;
MH=sun.nexty=H/2;
c.width=W;
c.height=H;
a.fillRect(0,0,W,H);
a.fillStyle = '#000';
createSun("rgb(255,"+GreenSun+",0)",sun.r,H,W);
colision();
for(var i=0;i<planets.length;i++){
drawPlanet(planets[i]);
}
}
