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var kari,count,ime,ctx,gt,gr,gratank,mtank,sokudo,max=15;

(function(){
    var a,b,canvas,col;
    canvas=document.getElementById("world");
    ctx=canvas.getContext("2d");
    canvas.width=canvas.height=400;
    ctx.fillStyle="rgb(0,0,0)";
    ctx.fillRect(0,0,400,400);
    ime=ctx.getImageData(0,0,400,400);
    
    col=[
        [0,0,0],[255,155,0],[255,255,0],[255,255,255]
    ];
    
    mtank=[];
    b=2;
    for(a=0;a<max;a++){
        mtank[a]=new Float32Array(b);
        b*=2;
    }
    mtank[0][0]=1;
    mtank[0][1]=0;
    
    gratank=[];
    for(a=0;a<100;a++)gratank[a]=gra(a/100,col);
    
    gt=[1.087,0.251,-0.078,-0.838,0.642,0.332,1.25,0.778];
    gr=[-0.012,-0.023,-0.013,0.038,-0.035,0.004,-0.036,-0.009];
    
    kari=[];
    for(a=0;a<400;a++)kari[a]=new Float32Array(400);
    
    sokudo=50;
    count=1;
    anim();
    })();

function step(){
    for(a=0;a<400;a++)for(b=0;b<400;b++)kari[a][b]*=0.97;
    if(count%sokudo===0)for(a=0;a<8;a++)gr[a]=(-1+Math.random()*2-gt[a])/sokudo;
    for(a=0;a<8;a++)gt[a]+=gr[a];
    hata(gt[0],gt[1],gt[2],gt[3],gt[4],gt[5],gt[6],gt[7]);
    count++;
}

function anim(){
step();
modosi(ime);
ctx.putImageData(ime,0,0);
requestAnimationFrame(anim);
}

function gra(atai,col){
    var a,b,c,d;
    var c1,c2,c3,N1,N2;
    
    if(atai<0)atai=0;
    if(atai>1)atai=1;
    atai*=col.length;
    N1=Math.floor(atai);
    N2=N1+1;
    if(N1>=col.length)N1=col.length-1;
    if(N2>=col.length)N2=col.length-1;
    a=atai%1;
    a=0.5-Math.cos(a*Math.PI)/2;
    b=1-a;
    
    c1=col[N1][0]*b+col[N2][0]*a;
    c2=col[N1][1]*b+col[N2][1]*a;
    c3=col[N1][2]*b+col[N2][2]*a;
    return [c1,c2,c3];
}

function ten1(x,y){
    var mx,x1,y1,x2,y2;
    mx=Math.floor(x);
    x2=x-mx;
    x1=1-x2;
    my=Math.floor(y);
    y2=y-my;
    y1=1-y2;
    pp(mx,my,x2*y2);
    pp(mx+1,my,x1*y2);
    pp(mx,my+1,x2*y1);
    pp(mx+1,my+1,x1*y1);

function pp(px,py,bai){
        if(px<0 || px>=400 || py<0 || py>=400)return;
        kari[py][px]+=bai;
    }
}

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