web-dashcam/dashcam.html

<style>
* { box-sizing: border-box; margin: 0; padding: 0; }
#app { font-family: var(--font-mono); background: #000; border-radius: var(--border-radius-lg); overflow: hidden; position: relative; width: 100%; height: 56vw; min-height: 300px; max-height: 92vh; }
#app.fullscreen { border-radius: 0; height: 100vh; width: 100vw; position: fixed; inset: 0; z-index: 9999; }

#video { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; display: block; }

#hud { position: absolute; inset: 0; pointer-events: none; }

#speed-display { position: absolute; top: 14px; right: 14px; text-align: center; background: rgba(0,0,0,0.45); border-radius: 12px; padding: 8px 16px; pointer-events: none; }
#speed-val { font-size: 48px; font-weight: 700; color: #fff; line-height: 1; }
#speed-unit { font-size: 11px; color: #aaa; letter-spacing: 1.5px; margin-top: 2px; }
#max-speed { font-size: 10px; color: #888; margin-top: 3px; letter-spacing: 0.5px; }

#clock { position: absolute; top: 14px; left: 14px; background: rgba(0,0,0,0.45); border-radius: 20px; padding: 5px 12px; color: #fff; font-size: 13px; display: none; }

#gps-bar { position: absolute; bottom: 52px; left: 0; right: 0; background: rgba(0,0,0,0.5); padding: 5px 14px; display: none; flex-direction: column; gap: 3px; }
#gps-row1, #gps-row2 { display: flex; gap: 18px; align-items: center; }
.gps-item { font-size: 10px; color: #ccc; display: flex; gap: 4px; align-items: center; }
.gps-label { color: #777; font-size: 9px; letter-spacing: 0.5px; }
.gps-val { color: #fff; font-weight: 500; }
#gps-dot { width: 6px; height: 6px; border-radius: 50%; background: #555; flex-shrink: 0; }
#gps-dot.active { background: #1D9E75; animation: gpsblink 2s infinite; }
@keyframes gpsblink { 0%,100%{opacity:1} 50%{opacity:0.4} }

#placeholder { position: absolute; inset: 0; display: flex; flex-direction: column; align-items: center; justify-content: center; color: #888; font-size: 14px; gap: 10px; font-family: var(--font-sans); background: #000; }

#btn-bar { position: absolute; bottom: 0; left: 0; right: 0; display: flex; justify-content: center; align-items: center; gap: 20px; padding: 8px 16px; background: rgba(0,0,0,0.45); pointer-events: all; }

.hud-btn { background: rgba(255,255,255,0.12); border: 0.5px solid rgba(255,255,255,0.2); color: #fff; border-radius: 20px; padding: 5px 14px; font-size: 11px; font-family: var(--font-sans); cursor: pointer; letter-spacing: 0.5px; transition: background 0.15s; }
.hud-btn:hover { background: rgba(255,255,255,0.22); }
.hud-btn:disabled { opacity: 0.3; cursor: default; }
.hud-btn.primary { background: rgba(29,158,117,0.7); border-color: rgba(29,158,117,0.9); }
.hud-btn.primary:hover { background: rgba(29,158,117,0.9); }

#status-bar { position: absolute; bottom: 40px; left: 14px; font-size: 10px; color: rgba(255,255,255,0.5); font-family: var(--font-sans); pointer-events: none; display: none; }
</style>

<div id="app">
  <video id="video" autoplay playsinline muted></video>

  <div id="placeholder">
    <div style="font-size:42px">&#127909;</div>
    <div style="color:#aaa">Tap Start to begin</div>
    <div style="font-size:11px;color:#555">Camera + location permissions required</div>
  </div>

  <div id="hud">
    <div id="clock"></div>

    <div id="speed-display">
      <div id="speed-val">--</div>
      <div id="speed-unit">MPH</div>
      <div id="max-speed">MAX --</div>
    </div>

    <div id="gps-bar">
      <div id="gps-row1">
        <div id="gps-dot"></div>
        <div class="gps-item"><span class="gps-label">LAT</span><span class="gps-val" id="lat-val">--</span></div>
        <div class="gps-item"><span class="gps-label">LNG</span><span class="gps-val" id="lng-val">--</span></div>
        <div class="gps-item"><span class="gps-label">ALT</span><span class="gps-val" id="alt-val">--</span></div>
      </div>
      <div id="gps-row2">
        <div class="gps-item"><span class="gps-label">ACC</span><span class="gps-val" id="acc-val">--</span></div>
        <div class="gps-item"><span class="gps-label">HDG</span><span class="gps-val" id="hdg-val">--</span></div>
        <div class="gps-item"><span class="gps-label">DIST</span><span class="gps-val" id="dist-val">0.0km</span></div>
      </div>
    </div>

    <div id="status-bar" id="status"></div>

    <div id="btn-bar">
      <button class="hud-btn primary" id="start-btn" onclick="startDashcam()">START</button>
      <button class="hud-btn" id="flip-btn" onclick="switchCamera()" disabled>FLIP</button>
      <button class="hud-btn" id="unit-btn" onclick="toggleUnit()">MPH/KPH</button>
      <button class="hud-btn" id="fs-btn" onclick="toggleFullscreen()">&#x26F6; FULL</button>
    </div>
  </div>
</div>

<script>
let stream = null;
let facingMode = 'environment';
let watchId = null;
let useMph = true;
let maxSpeed = 0;
let lastPos = null;
let totalDist = 0;
let clockInterval = null;

function ms2mph(ms){ return ms * 2.23694; }
function ms2kph(ms){ return ms * 3.6; }
function cvt(ms){ return useMph ? ms2mph(ms) : ms2kph(ms); }

function haversine(a, b) {
  const R = 6371000;
  const dLat = (b.lat - a.lat) * Math.PI / 180;
  const dLng = (b.lng - a.lng) * Math.PI / 180;
  const x = Math.sin(dLat/2)**2 + Math.cos(a.lat*Math.PI/180)*Math.cos(b.lat*Math.PI/180)*Math.sin(dLng/2)**2;
  return R * 2 * Math.atan2(Math.sqrt(x), Math.sqrt(1-x));
}

function bearingLabel(deg) {
  if (deg === null || deg === undefined || isNaN(deg)) return '--';
  const dirs = ['N','NE','E','SE','S','SW','W','NW'];
  return dirs[Math.round(deg/45)%8] + ' ' + Math.round(deg) + '\xb0';
}

function updateClock() {
  const n = new Date();
  const pad = v => String(v).padStart(2,'0');
  document.getElementById('clock').textContent = pad(n.getHours())+':'+pad(n.getMinutes())+':'+pad(n.getSeconds());
}

function setStatus(msg) {
  const el = document.getElementById('status-bar');
  el.textContent = msg;
  el.style.display = msg ? 'block' : 'none';
}

function startGPS() {
  if (!navigator.geolocation) { setStatus('GPS unavailable'); return; }
  document.getElementById('gps-bar').style.display = 'flex';
  watchId = navigator.geolocation.watchPosition(pos => {
    const c = pos.coords;
    const spd = c.speed !== null && c.speed >= 0 ? c.speed : 0;
    const converted = cvt(spd);
    if (converted > maxSpeed) maxSpeed = converted;

    const cur = { lat: c.latitude, lng: c.longitude };
    if (lastPos) {
      const d = haversine(lastPos, cur);
      if (d < 200) totalDist += d;
    }
    lastPos = cur;

    document.getElementById('speed-val').textContent = Math.round(converted);
    document.getElementById('max-speed').textContent = 'MAX ' + Math.round(maxSpeed);
    document.getElementById('lat-val').textContent = c.latitude.toFixed(5);
    document.getElementById('lng-val').textContent = c.longitude.toFixed(5);
    document.getElementById('alt-val').textContent = c.altitude !== null ? Math.round(c.altitude)+'m' : '--';
    document.getElementById('acc-val').textContent = Math.round(c.accuracy)+'m';
    document.getElementById('hdg-val').textContent = bearingLabel(c.heading);
    document.getElementById('dist-val').textContent = (totalDist/1000).toFixed(2)+'km';
    document.getElementById('gps-dot').className = 'active';
    setStatus('');
  }, err => {
    setStatus('GPS: ' + err.message);
    document.getElementById('gps-dot').className = '';
  }, { enableHighAccuracy: true, maximumAge: 1000, timeout: 15000 });
}

async function startDashcam() {
  const btn = document.getElementById('start-btn');
  btn.disabled = true;
  btn.textContent = '...';
  try {
    if (stream) stream.getTracks().forEach(t => t.stop());
    stream = await navigator.mediaDevices.getUserMedia({
      video: { facingMode: facingMode, width: { ideal: 1920 }, height: { ideal: 1080 } },
      audio: false
    });
    document.getElementById('video').srcObject = stream;
    document.getElementById('placeholder').style.display = 'none';
    document.getElementById('clock').style.display = 'block';
    document.getElementById('flip-btn').disabled = false;
    btn.textContent = 'RESTART';
    btn.disabled = false;
    if (watchId !== null) { navigator.geolocation.clearWatch(watchId); watchId = null; }
    maxSpeed = 0; totalDist = 0; lastPos = null;
    startGPS();
    if (clockInterval) clearInterval(clockInterval);
    clockInterval = setInterval(updateClock, 1000);
    updateClock();
    setStatus('Acquiring GPS...');
  } catch(e) {
    setStatus('Camera: ' + e.message);
    btn.textContent = 'START';
    btn.disabled = false;
  }
}

function switchCamera() {
  facingMode = facingMode === 'environment' ? 'user' : 'environment';
  startDashcam();
}

function toggleUnit() {
  useMph = !useMph;
  maxSpeed = useMph ? maxSpeed / 3.6 * 2.23694 : maxSpeed / 2.23694 * 3.6;
  document.getElementById('speed-unit').textContent = useMph ? 'MPH' : 'KPH';
}

function toggleFullscreen() {
  const app = document.getElementById('app');
  const btn = document.getElementById('fs-btn');
  const isFs = app.classList.contains('fullscreen');
  if (!isFs) {
    if (app.requestFullscreen) {
      app.requestFullscreen().catch(() => {});
    }
    app.classList.add('fullscreen');
    btn.textContent = '\u2715 EXIT';
  } else {
    if (document.exitFullscreen && document.fullscreenElement) {
      document.exitFullscreen().catch(() => {});
    }
    app.classList.remove('fullscreen');
    btn.textContent = '\u26f6 FULL';
  }
  document.addEventListener('fullscreenchange', () => {
    if (!document.fullscreenElement) {
      app.classList.remove('fullscreen');
      btn.textContent = '\u26f6 FULL';
    }
  }, { once: true });
}
</script>