quimbot/docs/gallery/aura.html at main · milwrite/quimbot · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
  <link rel="icon" type="image/png" href="../favicon.png">
<meta charset="utf-8"/>
<meta name="viewport" content="width=device-width,initial-scale=1,viewport-fit=cover"/>
<link rel="icon" href="data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHZpZXdCb3g9IjAgMCAzMiAzMiI+CiAgPHJlY3QgZmlsbD0iIzBhMGEwYSIgd2lkdGg9IjMyIiBoZWlnaHQ9IjMyIi8+CiAgPHBhdGggZD0iTTggOCBMMjQgOCBMMjQgMjQgTDggMjQgWiBNMTIgMTIgTDIwIDEyIEwyMCAyMCBMMTIgMjAgWiIgZmlsbD0ibm9uZSIgc3Ryb2tlPSIjZTBlMGUwIiBzdHJva2Utd2lkdGg9IjEuNSIvPgo8L3N2Zz4K"/>
<title>Cursor Aura</title>
<style>
*{margin:0;padding:0;box-sizing:border-box}
html,body{height:100%;background:#03030a;overflow:hidden}
canvas{display:block;width:100%;height:100%;touch-action:none}
@media (pointer:fine){ html,body{cursor:none} .back-btn{cursor:none} }
#info{position:fixed;bottom:16px;left:50%;transform:translateX(-50%);color:rgba(255,255,255,0.8);background:rgba(0,0,0,0.5);padding:6px 14px;border-radius:6px;font:12px/1.4 ui-monospace,monospace;pointer-events:none;text-align:center;white-space:nowrap;max-width:92vw}
.back-btn{position:fixed;top:16px;right:16px;background:rgba(20,20,20,0.8);border:1px solid #444;color:#e0e0e0;padding:8px 14px;border-radius:6px;font:12px ui-monospace,monospace;text-decoration:none;backdrop-filter:blur(8px);z-index:1000;transition:border-color 0.2s}
.back-btn:hover{border-color:#888}
</style>
</head>
<body>
<a href="./" class="back-btn">← Gallery</a>
<canvas id="c"></canvas>
<div id="info">Cursor Aura · move or drag · tap to burst · hold to paint</div>
<script>
if(window.self!==window.top){
  document.querySelectorAll('.back-btn,#info').forEach(e=>e.style.display='none');
}

const isTouchDevice=matchMedia('(pointer: coarse)').matches;
const canvas=document.getElementById('c');
const ctx=canvas.getContext('2d',{alpha:true,desynchronized:true});
let W=0,H=0,DPR=1;

function resize(){
  DPR=Math.min(window.devicePixelRatio||1,isTouchDevice?1.5:2);
  W=window.innerWidth;
  H=window.innerHeight;
  canvas.width=Math.round(W*DPR);
  canvas.height=Math.round(H*DPR);
  ctx.setTransform(DPR,0,0,DPR,0,0);
}
resize();
let resizeTimer;
window.addEventListener('resize',()=>{
  clearTimeout(resizeTimer);
  resizeTimer=setTimeout(resize,120);
});
window.addEventListener('orientationchange',()=>setTimeout(resize,200));

let mx=W/2,my=H/2,smx=W/2,smy=H/2;
let hue=0,clicking=false,lastMx=W/2,lastMy=H/2;
const particles=[];
const trails=[];
const MAX_PARTICLES=isTouchDevice?260:420;
const MAX_TRAILS=isTouchDevice?120:180;

class Particle{
  constructor(x,y,burst){
    this.x=x;this.y=y;
    const angle=Math.random()*Math.PI*2;
    const spd=burst?(2+Math.random()*6):(0.3+Math.random()*1.8);
    this.vx=Math.cos(angle)*spd;
    this.vy=Math.sin(angle)*spd-(burst?1:0.2);
    this.life=1;
    this.decay=burst?(0.012+Math.random()*0.018):(0.007+Math.random()*0.012);
    this.r=burst?(4+Math.random()*8):(2+Math.random()*5);
    this.hue=(hue+Math.random()*60-30+360)%360;
    this.sat=70+Math.random()*30;
    this.lit=55+Math.random()*25;
  }
  update(){
    this.x+=this.vx; this.y+=this.vy;
    this.vy+=0.04;
    this.vx*=0.97; this.vy*=0.97;
    this.life-=this.decay;
    this.r*=0.995;
  }
  draw(){
    const a=Math.max(0,this.life);
    ctx.beginPath();
    ctx.arc(this.x,this.y,this.r,0,Math.PI*2);
    ctx.fillStyle=`hsla(${this.hue},${this.sat}%,${this.lit}%,${a})`;
    ctx.shadowColor=`hsla(${this.hue},100%,65%,${a*0.5})`;
    ctx.shadowBlur=10;
    ctx.fill();
  }
}

class TrailPoint{
  constructor(x,y,h){ this.x=x;this.y=y;this.hue=h;this.life=0.9+Math.random()*0.1;this.r=18+Math.random()*12;this.decay=0.018+Math.random()*0.012; }
  update(){ this.life-=this.decay; this.r+=0.3; }
  dead(){ return this.life<=0; }
}

function drawCursor(x,y){
  const g=ctx.createRadialGradient(x,y,0,x,y,80);
  g.addColorStop(0,`hsla(${hue},100%,70%,0.18)`);
  g.addColorStop(0.4,`hsla(${(hue+40)%360},90%,60%,0.08)`);
  g.addColorStop(1,`hsla(${(hue+80)%360},80%,50%,0)`);
  ctx.beginPath(); ctx.arc(x,y,80,0,Math.PI*2); ctx.fillStyle=g; ctx.fill();

  const g2=ctx.createRadialGradient(x,y,5,x,y,28);
  g2.addColorStop(0,`hsla(${hue},100%,85%,0.6)`);
  g2.addColorStop(0.5,`hsla(${(hue+30)%360},100%,65%,0.35)`);
  g2.addColorStop(1,`hsla(${(hue+60)%360},90%,50%,0)`);
  ctx.beginPath(); ctx.arc(x,y,28,0,Math.PI*2); ctx.fillStyle=g2; ctx.fill();

  ctx.beginPath(); ctx.arc(x,y,5,0,Math.PI*2);
  ctx.fillStyle=`hsla(${hue},100%,90%,0.95)`;
  ctx.shadowColor=`hsla(${hue},100%,70%,0.8)`;
  ctx.shadowBlur=16;
  ctx.fill();
  ctx.shadowBlur=0;
}

function emit(burst){
  const count=burst?30:(clicking?3:1);
  for(let i=0;i<count;i++){
    if(particles.length>=MAX_PARTICLES) particles.shift();
    particles.push(new Particle(smx+Math.random()*4-2,smy+Math.random()*4-2,burst));
  }
}

let lastTrail=0;
function loop(t){
  ctx.fillStyle='rgba(3,3,10,0.18)';
  ctx.fillRect(0,0,W,H);

  smx+=(mx-smx)*0.12;
  smy+=(my-smy)*0.12;
  hue=(hue+0.6)%360;

  const speed=Math.hypot(mx-lastMx,my-lastMy);
  if(t-lastTrail>16){
    if(trails.length>=MAX_TRAILS) trails.shift();
    trails.push(new TrailPoint(smx,smy,hue));
    lastTrail=t;
    emit(false);
    if(clicking&&speed>2) emit(false);
  }
  lastMx=mx; lastMy=my;

  for(const tp of trails){
    tp.update();
    const a=Math.max(0,tp.life)*0.22;
    const g=ctx.createRadialGradient(tp.x,tp.y,0,tp.x,tp.y,tp.r);
    g.addColorStop(0,`hsla(${tp.hue},80%,65%,${a})`);
    g.addColorStop(1,`hsla(${tp.hue},60%,40%,0)`);
    ctx.beginPath(); ctx.arc(tp.x,tp.y,tp.r,0,Math.PI*2); ctx.fillStyle=g; ctx.fill();
  }
  for(let i=trails.length-1;i>=0;i--){ if(trails[i].dead()) trails.splice(i,1); }

  for(let i=particles.length-1;i>=0;i--){
    const p=particles[i]; p.update();
    if(p.life<=0){ particles.splice(i,1); continue; }
    p.draw();
  }
  ctx.shadowBlur=0;

  drawCursor(smx,smy);
  requestAnimationFrame(loop);
}
requestAnimationFrame(loop);

window.addEventListener('pointermove',e=>{ mx=e.clientX; my=e.clientY; });
window.addEventListener('pointerdown',e=>{ clicking=true; mx=e.clientX; my=e.clientY; emit(true); });
window.addEventListener('pointerup',()=>{ clicking=false; });
window.addEventListener('pointercancel',()=>{ clicking=false; });

window.addEventListener('touchstart',e=>{ e.preventDefault(); },{passive:false});
window.addEventListener('touchmove',e=>{ e.preventDefault(); },{passive:false});
</script>
</body>
</html>