characterglitch/dejong_organism.html at main · willbearfruits/characterglitch · GitHub

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<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width,initial-scale=1,viewport-fit=cover">
<style>
*{margin:0;padding:0}
body{background:#020204;overflow:hidden;touch-action:none;cursor:none}
canvas{display:block}
</style>
</head>
<body>
<canvas id="c"></canvas>
<script>
const cv=document.getElementById('c');
const ctx=cv.getContext('2d');

const CELL=10.35;
let W,H,cols,rows;
let grid,colorGrid,ageGrid;
let mx=0.5,my=0.5;
let t=0;

// character density ramps - from nothing to solid
const DUST='\u00B7\u2027\u2219\u2022';
const THIN='\u2581\u2582\u2583\u2584\u2585\u2586\u2587\u2588';
const DOTS='\u2800\u2801\u2803\u2807\u280F\u281F\u283F\u287F\u28FF';
const DENSE='\u2591\u2592\u2593\u2588\u25A0\u25A3\u25A6\u25A9';
const ORGANIC='\u0E4F\u06DE\u0A66\u0B66\u2740\u273B\u2735\u2733\u2734\u2739';
const ANGULAR='\u25E2\u25E3\u25E4\u25E5\u25C6\u25C7\u2B22\u2B23';
const ALL_DENSE=[...DOTS,...THIN,...DENSE];

function resize(){
  W=window.innerWidth;H=window.innerHeight;
  cv.width=W;cv.height=H;
  cols=Math.floor(W/(CELL*0.58));
  rows=Math.floor(H/CELL);
  grid=new Float32Array(cols*rows);
  colorGrid=new Float32Array(cols*rows*3);
  ageGrid=new Float32Array(cols*rows);
  ctx.font=CELL+'px Courier New';
  ctx.textBaseline='top';
}

// De Jong attractor
// x' = sin(a*y) - cos(b*x)
// y' = sin(c*x) - cos(d*y)
function iterate(x,y,a,b,c,d){
  return[
    Math.sin(a*y)-Math.cos(b*x),
    Math.sin(c*x)-Math.cos(d*y)
  ];
}

// map attractor coords (-2..2) to grid
function toGrid(x,y){
  const gc=Math.floor((x+2.2)/4.4*cols);
  const gr=Math.floor((y+2.2)/4.4*rows);
  return[gc,gr];
}

function frame(){
  t+=0.003;

  // attractor parameters - mouse controls two, time drifts two
  const a=mx*6-3;
  const b=my*6-3;
  const c=Math.sin(t*1.7)*2.5+Math.cos(t*0.3)*0.5;
  const d=Math.cos(t*1.1)*2.5+Math.sin(t*0.7)*0.5;

  // decay existing grid
  for(let i=0;i<cols*rows;i++){
    grid[i]*=0.965;
    ageGrid[i]+=0.01;
    colorGrid[i*3]*=0.97;
    colorGrid[i*3+1]*=0.97;
    colorGrid[i*3+2]*=0.97;
  }

  // run attractor - lots of iterations per frame
  let x=Math.sin(t*3)*0.1;
  let y=Math.cos(t*2)*0.1;

  // skip transient
  for(let i=0;i<50;i++){
    const n=iterate(x,y,a,b,c,d);
    x=n[0];y=n[1];
  }

  const iters=18000;
  for(let i=0;i<iters;i++){
    const n=iterate(x,y,a,b,c,d);
    x=n[0];y=n[1];

    if(x<-2.2||x>2.2||y<-2.2||y>2.2)continue;

    const[gc,gr]=toGrid(x,y);
    if(gc<0||gc>=cols||gr<0||gr>=rows)continue;

    const idx=gr*cols+gc;
    grid[idx]+=0.15;
    ageGrid[idx]=0;

    // color based on position in attractor phase space
    const phase=Math.atan2(y,x);
    const dist=Math.sqrt(x*x+y*y);

    // multiple color regimes based on angle
    const h=(phase+Math.PI)/(2*Math.PI);
    const regime=Math.floor(h*5)%5;

    const ci=idx*3;
    switch(regime){
      case 0: colorGrid[ci]+=0.12;colorGrid[ci+1]+=0.03;colorGrid[ci+2]+=0.06;break;
      case 1: colorGrid[ci]+=0.03;colorGrid[ci+1]+=0.12;colorGrid[ci+2]+=0.08;break;
      case 2: colorGrid[ci]+=0.08;colorGrid[ci+1]+=0.04;colorGrid[ci+2]+=0.12;break;
      case 3: colorGrid[ci]+=0.11;colorGrid[ci+1]+=0.10;colorGrid[ci+2]+=0.02;break;
      case 4: colorGrid[ci]+=0.02;colorGrid[ci+1]+=0.11;colorGrid[ci+2]+=0.11;break;
    }
  }

  // also run a second attractor with slightly shifted params for texture
  let x2=Math.cos(t*5)*0.1;
  let y2=Math.sin(t*4)*0.1;
  const a2=a+Math.sin(t*3)*0.3;
  const b2=b+Math.cos(t*2)*0.3;
  for(let i=0;i<50;i++){const n=iterate(x2,y2,a2,b2,c,d);x2=n[0];y2=n[1];}
  for(let i=0;i<4000;i++){
    const n=iterate(x2,y2,a2,b2,c,d);
    x2=n[0];y2=n[1];
    if(x2<-2.2||x2>2.2||y2<-2.2||y2>2.2)continue;
    const[gc,gr]=toGrid(x2,y2);
    if(gc<0||gc>=cols||gr<0||gr>=rows)continue;
    const idx=gr*cols+gc;
    grid[idx]+=0.04;
    const ci=idx*3;
    colorGrid[ci]+=0.04;colorGrid[ci+1]+=0.04;colorGrid[ci+2]+=0.04;
  }

  // RENDER
  ctx.fillStyle='#020204';
  ctx.fillRect(0,0,W,H);

  const cw=CELL*0.58;

  for(let r=0;r<rows;r++){
    for(let c=0;c<cols;c++){
      const idx=r*cols+c;
      const v=grid[idx];
      if(v<0.05)continue;

      const density=Math.min(v,12);
      const norm=density/12;

      // character selection based on density
      let ch;
      if(norm<0.1){
        ch=DUST[Math.floor(norm/0.1*DUST.length)%DUST.length];
      }else if(norm<0.3){
        const n2=(norm-0.1)/0.2;
        ch=DOTS[Math.floor(n2*DOTS.length)%DOTS.length];
      }else if(norm<0.5){
        const n2=(norm-0.3)/0.2;
        const age=ageGrid[idx];
        if(age<0.05){
          ch=ORGANIC[Math.floor(Math.random()*ORGANIC.length)];
        }else{
          ch=ANGULAR[Math.floor(n2*ANGULAR.length)%ANGULAR.length];
        }
      }else if(norm<0.8){
        const n2=(norm-0.5)/0.3;
        ch=THIN[Math.floor(n2*THIN.length)%THIN.length];
      }else{
        ch=DENSE[Math.floor(norm/12*DENSE.length*8)%DENSE.length];
      }

      // color from accumulated color grid
      const ci=idx*3;
      const maxC=Math.max(colorGrid[ci],colorGrid[ci+1],colorGrid[ci+2],0.01);
      const scale=Math.min(255,norm*320)/maxC;

      let cr=Math.min(255,Math.floor(colorGrid[ci]*scale));
      let cg=Math.min(255,Math.floor(colorGrid[ci+1]*scale));
      let cb=Math.min(255,Math.floor(colorGrid[ci+2]*scale));

      // boost saturation
      const avg=(cr+cg+cb)/3;
      cr=Math.min(255,Math.floor(cr+(cr-avg)*0.8));
      cg=Math.min(255,Math.floor(cg+(cg-avg)*0.8));
      cb=Math.min(255,Math.floor(cb+(cb-avg)*0.8));
      cr=Math.max(0,cr);cg=Math.max(0,cg);cb=Math.max(0,cb);

      // recently hit cells glow brighter
      if(ageGrid[idx]<0.03){
        cr=Math.min(255,cr+80);
        cg=Math.min(255,cg+80);
        cb=Math.min(255,cb+80);
      }

      ctx.fillStyle=`rgb(${cr},${cg},${cb})`;
      ctx.fillText(ch,c*cw,r*CELL);
    }
  }

  // cursor: orbiting characters
  const curX=mx*W;
  const curY=my*H;
  ctx.fillStyle='rgba(255,255,255,0.6)';
  const orb='\u25CB\u25CF\u25C7\u25C6\u2729\u2727';
  for(let i=0;i<6;i++){
    const ang=t*3+i*Math.PI/3;
    const rad=14+Math.sin(t*5+i)*4;
    const ox=curX+Math.cos(ang)*rad;
    const oy=curY+Math.sin(ang)*rad;
    ctx.fillText(orb[i],ox-4,oy-5);
  }
  ctx.fillStyle='#fff';
  ctx.fillText('\u2316',curX-5,curY-6);

  requestAnimationFrame(frame);
}

document.addEventListener('mousemove',e=>{mx=e.clientX/W;my=e.clientY/H});
document.addEventListener('touchmove',e=>{e.preventDefault();mx=e.touches[0].clientX/W;my=e.touches[0].clientY/H},{passive:false});

// click: burst of noise into the grid
document.addEventListener('click',e=>{
  const bx=e.clientX/W;
  const by=e.clientY/H;
  const gc=Math.floor(bx*cols);
  const gr=Math.floor(by*rows);
  for(let dy=-8;dy<=8;dy++){
    for(let dx=-8;dx<=8;dx++){
      const r2=gr+dy,c2=gc+dx;
      if(r2<0||r2>=rows||c2<0||c2>=cols)continue;
      const d=Math.sqrt(dx*dx+dy*dy);
      if(d>8)continue;
      const idx=r2*cols+c2;
      grid[idx]+=Math.random()*3*(1-d/8);
      ageGrid[idx]=0;
      const ci=idx*3;
      colorGrid[ci]+=Math.random()*2;
      colorGrid[ci+1]+=Math.random()*2;
      colorGrid[ci+2]+=Math.random()*2;
    }
  }
});

window.addEventListener('resize',resize);
resize();
frame();
</script>
</body>
</html>