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Decision Spinner

Enter options and spin the wheel to let fate decide.

fun
8 downloads

By Lucas

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name: Decision Spinner description: "Enter options and spin the wheel to let fate decide." category: fun connections: [] version: 1

What it does

Decision Spinner lets you add up to 12 text options and spins an animated wheel (drawn on canvas) with each option on its own colored segment. The wheel eases to a stop and lands on a random winner shown in a banner — perfect for settling "where should we eat?" debates.

Setup

  • Open app.html in any browser (works from disk via file://).
  • Type options and tap "Add" (or press Enter); remove any with the remove button, or clear all at once.
  • Tap "SPIN" once at least 2 options are present. No data is saved; options last for the session only.

Source

app.html — the complete app (single self-contained file: HTML, CSS, and JavaScript, no external dependencies):

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Decision Spinner</title>
<style>
  * { box-sizing: border-box; }
  body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background: linear-gradient(160deg, #8f1d1d, #c2571b);
    min-height: 100vh;
    color: #fff;
    padding: 20px 12px 40px;
  }
  .wrap { max-width: 480px; margin: 0 auto; }
  h1 { text-align: center; font-size: 2rem; margin: 8px 0 2px; }
  .subtitle { text-align: center; opacity: 0.85; margin-bottom: 18px; font-size: 0.95rem; }
  .card {
    background: rgba(255,255,255,0.10);
    border: 1px solid rgba(255,255,255,0.18);
    border-radius: 14px;
    padding: 20px;
    margin-bottom: 14px;
  }
  .wheel-stage { position: relative; text-align: center; }
  canvas { max-width: 100%; height: auto; display: block; margin: 0 auto; }
  .pointer {
    position: absolute; top: -6px; left: 50%; transform: translateX(-50%);
    width: 0; height: 0;
    border-left: 14px solid transparent;
    border-right: 14px solid transparent;
    border-top: 24px solid #ffd166;
    filter: drop-shadow(0 2px 2px rgba(0,0,0,0.4));
    z-index: 2;
  }
  .winner {
    display: none;
    text-align: center;
    margin-top: 14px;
    padding: 14px;
    background: #ffd166;
    color: #5c2b00;
    border-radius: 12px;
    font-size: 1.25rem;
    font-weight: 800;
  }
  .winner.show { display: block; animation: pop 0.35s ease-out; }
  @keyframes pop {
    0% { transform: scale(0.7); opacity: 0; }
    100% { transform: scale(1); opacity: 1; }
  }
  .btn {
    display: inline-block; padding: 13px 30px;
    font-size: 1.05rem; font-weight: 800; color: #8f1d1d;
    background: #ffd166; border: none; border-radius: 12px; cursor: pointer;
    margin: 4px 4px;
  }
  .btn:hover:not(:disabled) { background: #ffce54; }
  .btn:disabled { opacity: 0.5; cursor: default; }
  .btn.secondary {
    background: rgba(255,255,255,0.15); color: #fff;
    border: 1px solid rgba(255,255,255,0.4);
    font-weight: 600; font-size: 0.9rem; padding: 9px 18px;
  }
  .center { text-align: center; }
  .add-row { display: flex; gap: 8px; margin-bottom: 12px; }
  #optionInput {
    flex: 1; padding: 12px; font-size: 1rem;
    border: 2px solid rgba(255,255,255,0.3); border-radius: 10px;
    background: rgba(255,255,255,0.12); color: #fff;
  }
  #optionInput::placeholder { color: rgba(255,255,255,0.6); }
  #optionInput:focus { outline: none; border-color: #ffd166; }
  .opt-list { list-style: none; margin: 0 0 4px; padding: 0; }
  .opt-list li {
    display: flex; justify-content: space-between; align-items: center;
    background: rgba(255,255,255,0.10);
    border-radius: 8px; padding: 8px 12px; margin-bottom: 6px;
  }
  .rm {
    background: none; border: none; color: #ffb3a7;
    font-size: 1.1rem; cursor: pointer; padding: 2px 8px;
  }
  .rm:hover { color: #ff6b5e; }
  .count-note { text-align: center; font-size: 0.85rem; opacity: 0.75; margin-top: 8px; }
</style>
</head>
<body>
<div class="wrap">
  <h1>Decision Spinner</h1>
  <p class="subtitle">Add your options, spin the wheel, and let fate decide.</p>

  <div class="card">
    <div class="wheel-stage">
      <div class="pointer"></div>
      <canvas id="wheel" width="420" height="420"></canvas>
    </div>
    <div class="winner" id="winnerBanner"></div>
    <div class="center" style="margin-top:14px;">
      <button class="btn" id="spinBtn">SPIN</button>
      <button class="btn secondary" id="clearBtn">Clear All</button>
    </div>
  </div>

  <div class="card">
    <div class="add-row">
      <input id="optionInput" type="text" maxlength="40" placeholder="Enter an option…" autocomplete="off">
      <button class="btn secondary" id="addBtn">Add</button>
    </div>
    <ul class="opt-list" id="optList"></ul>
    <div class="count-note" id="countNote"></div>
  </div>
</div>

<script>
"use strict";

var MAX_OPTIONS = 12;
var COLORS = [
  "#f94144", "#f3722c", "#f9c74f", "#90be6d",
  "#43aa8b", "#577590", "#b565d8", "#ff70a6",
  "#ff9770", "#ffd670", "#70d6ff", "#7d5a50"
];

var options = ["Pizza", "Sushi", "Tacos", "Pasta"];
var angle = 0;          // current wheel rotation (radians)
var spinning = false;
var winnerIndex = -1;

var canvas = document.getElementById("wheel");
var ctx = canvas.getContext("2d");
var optList = document.getElementById("optList");
var optionInput = document.getElementById("optionInput");
var addBtn = document.getElementById("addBtn");
var spinBtn = document.getElementById("spinBtn");
var clearBtn = document.getElementById("clearBtn");
var winnerBanner = document.getElementById("winnerBanner");
var countNote = document.getElementById("countNote");

var CX = canvas.width / 2;
var CY = canvas.height / 2;
var RADIUS = canvas.width / 2 - 8;

function drawWheel() {
  ctx.clearRect(0, 0, canvas.width, canvas.height);
  var n = options.length;
  if (n === 0) {
    ctx.beginPath();
    ctx.arc(CX, CY, RADIUS, 0, Math.PI * 2);
    ctx.fillStyle = "rgba(255,255,255,0.08)";
    ctx.fill();
    ctx.fillStyle = "rgba(255,255,255,0.7)";
    ctx.font = "16px sans-serif";
    ctx.textAlign = "center";
    ctx.textBaseline = "middle";
    ctx.fillText("Add options below to build your wheel", CX, CY);
    return;
  }
  var slice = (Math.PI * 2) / n;
  for (var i = 0; i < n; i++) {
    var start = angle + i * slice;
    var end = start + slice;
    ctx.beginPath();
    ctx.moveTo(CX, CY);
    ctx.arc(CX, CY, RADIUS, start, end);
    ctx.closePath();
    ctx.fillStyle = COLORS[i % COLORS.length];
    ctx.fill();
    ctx.strokeStyle = "rgba(255,255,255,0.6)";
    ctx.lineWidth = 2;
    ctx.stroke();

    // label
    ctx.save();
    ctx.translate(CX, CY);
    ctx.rotate(start + slice / 2);
    ctx.textAlign = "right";
    ctx.textBaseline = "middle";
    ctx.fillStyle = "#fff";
    var label = options[i];
    var fontSize = Math.min(18, Math.max(11, 220 / (n * Math.max(1, label.length / 8))));
    ctx.font = "bold " + fontSize + "px sans-serif";
    ctx.shadowColor = "rgba(0,0,0,0.5)";
    ctx.shadowBlur = 4;
    var maxW = RADIUS - 40;
    var shown = label;
    while (ctx.measureText(shown).width > maxW && shown.length > 1) {
      shown = shown.slice(0, -1);
    }
    if (shown !== label) shown = shown.slice(0, -1) + "…";
    ctx.fillText(shown, RADIUS - 16, 0);
    ctx.restore();
  }
  // hub
  ctx.beginPath();
  ctx.arc(CX, CY, 26, 0, Math.PI * 2);
  ctx.fillStyle = "#ffd166";
  ctx.fill();
  ctx.beginPath();
  ctx.arc(CX, CY, 26, 0, Math.PI * 2);
  ctx.strokeStyle = "rgba(0,0,0,0.25)";
  ctx.lineWidth = 3;
  ctx.stroke();
}

function renderList() {
  optList.innerHTML = "";
  options.forEach(function(opt, i) {
    var li = document.createElement("li");
    var span = document.createElement("span");
    span.textContent = opt;
    var rm = document.createElement("button");
    rm.className = "rm";
    rm.textContent = "✕";
    rm.setAttribute("aria-label", "Remove option");
    rm.addEventListener("click", function() { removeOption(i); });
    li.appendChild(span);
    li.appendChild(rm);
    optList.appendChild(li);
  });
  countNote.textContent = options.length + " / " + MAX_OPTIONS + " options";
  spinBtn.disabled = options.length < 2;
  drawWheel();
}

function hideWinner() {
  winnerBanner.classList.remove("show");
  winnerBanner.textContent = "";
  winnerIndex = -1;
}

function addOption() {
  var v = optionInput.value.trim();
  if (!v) return;
  if (options.length >= MAX_OPTIONS) {
    countNote.textContent = "Maximum of " + MAX_OPTIONS + " options reached.";
    return;
  }
  options.push(v);
  optionInput.value = "";
  optionInput.focus();
  hideWinner();
  renderList();
}

function removeOption(i) {
  options.splice(i, 1);
  hideWinner();
  renderList();
}

function clearAll() {
  options = [];
  hideWinner();
  renderList();
}

function easeOutCubic(t) {
  return 1 - Math.pow(1 - t, 3);
}

function spin() {
  if (spinning || options.length < 2) return;
  spinning = true;
  spinBtn.disabled = true;
  hideWinner();

  var n = options.length;
  var slice = (Math.PI * 2) / n;
  var target = Math.floor(Math.random() * n);
  winnerIndex = target;

  // Pointer is at top (-PI/2). We want the center of target slice to end under the pointer.
  var currentMod = angle % (Math.PI * 2);
  if (currentMod < 0) currentMod += Math.PI * 2;
  var targetCenter = target * slice + slice / 2;
  var desiredMod = ((-Math.PI / 2) - targetCenter) % (Math.PI * 2);
  if (desiredMod < 0) desiredMod += Math.PI * 2;
  var delta = (desiredMod - currentMod + Math.PI * 2) % (Math.PI * 2);
  var fullTurns = (5 + Math.floor(Math.random() * 3)) * Math.PI * 2;
  var totalDelta = fullTurns + delta;

  var duration = 4200;
  var startTime = null;
  var startAngle = angle;

  function frame(now) {
    if (startTime === null) startTime = now;
    var t = Math.min((now - startTime) / duration, 1);
    angle = startAngle + totalDelta * easeOutCubic(t);
    drawWheel();
    if (t < 1) {
      window.requestAnimationFrame(frame);
    } else {
      spinning = false;
      spinBtn.disabled = false;
      winnerBanner.textContent = "Winner: " + options[winnerIndex];
      winnerBanner.classList.add("show");
    }
  }
  window.requestAnimationFrame(frame);
}

addBtn.addEventListener("click", addOption);
optionInput.addEventListener("keydown", function(e) {
  if (e.key === "Enter") addOption();
});
clearBtn.addEventListener("click", clearAll);
spinBtn.addEventListener("click", spin);

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

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