MedusaGaze/index.html at main · ArizmendiWan/MedusaGaze · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8" />
  <title>Medusa Gaze Live</title>
  <style>
    body {
      margin: 0;
      background: #111;
      color: #eee;
      font-family: sans-serif;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      height: 100vh;
    }
    #video, #canvas {
      display: none;
    }
    #view {
      border: 2px solid #444;
      box-shadow: 0 0 10px #000;
    }
    #info {
      margin-top: 10px;
      font-size: 14px;
    }
  </style>
</head>
<body>
  <h2>Medusa Gaze Live Demo</h2>

  <video id="video" autoplay playsinline></video>
  <canvas id="view"></canvas>
  <canvas id="canvas"></canvas>

  <div id="info">Initializing...</div>

  <script>
    const video = document.getElementById("video");
    const viewCanvas = document.getElementById("view");
    const viewCtx = viewCanvas.getContext("2d");
    const sendCanvas = document.getElementById("canvas");
    const sendCtx = sendCanvas.getContext("2d");
    const info = document.getElementById("info");

    const BACKEND_URL = "http://localhost:8000/predict";
    const TARGET_INTERVAL = 50;

    let running = true;
    let lastFpsTime = performance.now();
    let frameCount = 0;
    let latestBox = null;
    let latestGaze = null;

    async function initCamera() {
      try {
        const stream = await navigator.mediaDevices.getUserMedia({
          video: true,
          audio: false
        });
        video.srcObject = stream;

        await new Promise((resolve) => {
          video.onloadedmetadata = () => resolve();
        });

        const width = video.videoWidth || 640;
        const height = video.videoHeight || 480;

        viewCanvas.width = width;
        viewCanvas.height = height;
        sendCanvas.width = width;
        sendCanvas.height = height;

        info.textContent = "Camera initialized. Streaming...";
        loop();
        sendFrameLoop();
      } catch (err) {
        console.error(err);
        info.textContent = "Failed to access camera: " + err.message;
      }
    }

    function drawFaceBox(box) {
      if (!box) return;
      const [x1, y1, x2, y2] = box;
      viewCtx.strokeStyle = "red";
      viewCtx.lineWidth = 2;
      viewCtx.strokeRect(x1, y1, x2 - x1, y2 - y1);
    }

    function drawGaze(gaze, box) {
      if (!gaze) return;
      const g = Array.isArray(gaze[0]) ? gaze[0] : gaze; // flatten [[x,y]] to [x,y] if needed
      if (!Array.isArray(g) || g.length < 2) return;
      const [gx, gy] = g;
      const [x1, y1, x2, y2] = box;
      const cx = x1 + (x2 - x1) / 2;
      const cy = y1 + (y2 - y1) / 2;

      const faceSize = Math.min(x2 - x1, y2 - y1);
      const scale = faceSize * 2; // vector length relative to face size
      const dx = gx * scale;
      const dy = gy * scale;

      // main vector
      viewCtx.strokeStyle = "#00e676";
      viewCtx.lineWidth = 3;
      viewCtx.beginPath();
      viewCtx.moveTo(cx, cy);
      viewCtx.lineTo(cx + dx, cy + dy);
      viewCtx.stroke();

      // arrowhead
      const angle = Math.atan2(dy, dx);
      const headLen = Math.max(8, faceSize * 0.06);
      viewCtx.beginPath();
      viewCtx.moveTo(cx + dx, cy + dy);
      viewCtx.lineTo(
        cx + dx - headLen * Math.cos(angle - Math.PI / 6),
        cy + dy - headLen * Math.sin(angle - Math.PI / 6)
      );
      viewCtx.moveTo(cx + dx, cy + dy);
      viewCtx.lineTo(
        cx + dx - headLen * Math.cos(angle + Math.PI / 6),
        cy + dy - headLen * Math.sin(angle + Math.PI / 6)
      );
      viewCtx.stroke();
    }

    function updateFps() {
      frameCount++;
      const now = performance.now();
      if (now - lastFpsTime >= 1000) {
        const fps = (frameCount * 1000) / (now - lastFpsTime);
        info.textContent = `Streaming... ~${fps.toFixed(1)} fps`;
        frameCount = 0;
        lastFpsTime = now;
      }
    }

    function loop() {
      if (!running) return;
      const start = performance.now();

      viewCtx.drawImage(video, 0, 0, viewCanvas.width, viewCanvas.height);

      if (latestBox) {
        drawFaceBox(latestBox);
      }

      if (latestGaze && latestBox) {
        drawGaze(latestGaze, latestBox);
      }

      updateFps();

      const elapsed = performance.now() - start;
      const delay = Math.max(0, TARGET_INTERVAL - elapsed);
      setTimeout(() => {
        requestAnimationFrame(loop);
      }, delay);
    }

    function sendFrameLoop() {
      if (!running) return;
      const start = performance.now();

      sendCtx.drawImage(video, 0, 0, sendCanvas.width, sendCanvas.height);

      sendCanvas.toBlob(async (blob) => {
        if (!blob) {
          setTimeout(sendFrameLoop, TARGET_INTERVAL);
          return;
        }

        const formData = new FormData();
        formData.append("frame", blob, "frame.png");

        try {
          const resp = await fetch(BACKEND_URL, {
            method: "POST",
            body: formData
          });
          const data = await resp.json();
          if (data.face_found && data.face_bbox) {
            latestBox = data.face_bbox;
            const g = Array.isArray(data.gaze) && Array.isArray(data.gaze[0]) ? data.gaze[0] : data.gaze;
            latestGaze = g;
          } else {
            latestBox = null;
            latestGaze = null;
          }
        } catch (err) {
          console.error("Request error:", err);
        }

        const elapsed = performance.now() - start;
        const delay = Math.max(0, TARGET_INTERVAL - elapsed);
        setTimeout(sendFrameLoop, delay);
      }, "image/png");
    }

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