Epilepsy_Test/spider.html at main · alexanderdfox/Epilepsy_Test · GitHub

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<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Hyper Spider Cursor - Multi Pointer Spawn</title>
<style>
body{
  margin:0;
  background:black;
  overflow:hidden;
  cursor:none;
}
canvas{
  display:block;
  position:fixed;
  top:0;
  left:0;
  pointer-events:none;
}
button{
  position:absolute;
  padding:12px 20px;
  font-size:16px;
}
</style>
</head>
<body>

<button style="top:200px;left:200px">Button A</button>
<button style="top:400px;left:500px">Button B</button>
<button style="top:150px;left:700px">Button C</button>

<canvas id="c"></canvas>

<script>
const canvas = document.getElementById("c");
const ctx = canvas.getContext("2d");
canvas.width = window.innerWidth;
canvas.height = window.innerHeight;

// ----------------
// pointers
// ----------------
let pointers = {}; // { pointerId: spiderIndex }

// ----------------
// spiders
// ----------------
let spiders = [];

// ----------------
// web strands
// ----------------
let strands = [];
function addStrand(a,b){
  strands.push({a,b,offset:0,vel:0});
}
function connectNetwork(){
  strands = [];
  for(let i=0;i<spiders.length;i++){
	for(let j=i+1;j<spiders.length;j++){
	  if(Math.random()<0.5){
		addStrand(i,j);
	  }
	}
  }
}

// ----------------
// pointer events
// ----------------
window.addEventListener("pointerdown", e=>{
  // spawn a spider for this pointer
  let spider = {
	x: e.clientX,
	y: e.clientY,
	step: Math.random()*10,
	angle: 0
  };
  let index = spiders.push(spider) - 1;
  pointers[e.pointerId] = index;
  connectNetwork();
});

window.addEventListener("pointermove", e=>{
  if(pointers[e.pointerId] !== undefined){
	let s = spiders[pointers[e.pointerId]];
	let dx = e.clientX - s.x;
	let dy = e.clientY - s.y;
	s.angle = Math.atan2(dy, dx);
	s.x = e.clientX;
	s.y = e.clientY;
  }
});

window.addEventListener("pointerup", e=>{
  // optional: remove spider on pointer up
  // let index = pointers[e.pointerId];
  // spiders.splice(index, 1);
  // delete pointers[e.pointerId];
  // connectNetwork();
  delete pointers[e.pointerId]; // keep spider, just release control
});

// ----------------
// teleport to clickable
// ----------------
function jumpToClickable(){
  let el=[...document.querySelectorAll("button,a,input")];
  if(el.length===0) return;
  let target=el[Math.floor(Math.random()*el.length)];
  let r=target.getBoundingClientRect();
  if(spiders.length>0){
	spiders[0].x = r.left + r.width/2;
	spiders[0].y = r.top + r.height/2;
  }
}
setInterval(jumpToClickable,8000);

// ----------------
// physics update
// ----------------
function updatePhysics(){
  for(let s of strands){
	let A=spiders[s.a];
	let B=spiders[s.b];
	let dx=B.x-A.x;
	let dy=B.y-A.y;
	let dist=Math.sqrt(dx*dx+dy*dy);
	let tension=(dist-200)*0.001;
	s.vel += -s.offset*0.1;
	s.vel += tension;
	s.vel *= 0.9;
	s.offset += s.vel;
  }
}

// ----------------
// draw strands
// ----------------
function drawStrands(){
  for(let s of strands){
	let A=spiders[s.a];
	let B=spiders[s.b];
	let mx=(A.x+B.x)/2;
	let my=(A.y+B.y)/2;
	let nx=(B.y-A.y)*0.1;
	let ny=(A.x-B.x)*0.1;
	ctx.strokeStyle="rgba(0,200,255,.6)";
	ctx.lineWidth=2;
	ctx.beginPath();
	ctx.moveTo(A.x,A.y);
	ctx.quadraticCurveTo(mx+nx*s.offset,my+ny*s.offset,B.x,B.y);
	ctx.stroke();
  }
}

// ----------------
// draw spider
// ----------------
function drawSpider(sp){
  let cx = sp.x;
  let cy = sp.y;
  ctx.save();
  ctx.translate(cx,cy);
  ctx.rotate(sp.angle || 0);
  sp.step += 0.1;

  // body
  ctx.strokeStyle="white";
  ctx.lineWidth=2;
  ctx.beginPath();
  ctx.moveTo(-5,0);
  ctx.lineTo(8,0);
  ctx.stroke();

  // legs
  for(let i=0;i<8;i++){
	let a = i*Math.PI/4;
	let walk = Math.sin(sp.step+(i%2))*6;
	let x1 = Math.cos(a)*10;
	let y1 = Math.sin(a)*10;
	let x2 = Math.cos(a)*(20+walk);
	let y2 = Math.sin(a)*(20-walk);
	ctx.strokeStyle = `hsl(${i*40},100%,70%)`;
	ctx.beginPath();
	ctx.moveTo(x1,y1);
	ctx.lineTo(x2,y2);
	ctx.stroke();
  }

  ctx.restore();
}

// ----------------
// animation
// ----------------
function update(){
  // drift uncontrolled spiders
  for(let i=0;i<spiders.length;i++){
	if(!Object.values(pointers).includes(i)){
	  let s = spiders[i];
	  s.x += Math.sin(Date.now()*0.001+i)*0.3;
	  s.y += Math.cos(Date.now()*0.001+i)*0.3;
	  s.angle = 0;
	}
  }

  updatePhysics();
}

function draw(){
  ctx.fillStyle="rgba(0,0,0,.25)";
  ctx.fillRect(0,0,canvas.width,canvas.height);
  drawStrands();
  for(let s of spiders){
	drawSpider(s);
  }
  requestAnimationFrame(loop);
}

function loop(){
  update();
  draw();
}

loop();
</script>
</body>
</html>