index_sans_gif.js

(async function() {
  // Retrieve the current script tag and the config URL from its data attribute.
  const scriptTag = document.currentScript;
  const configUrl = scriptTag.getAttribute("data-config");
  let config = {};
  if (configUrl) {
    try {
      const response = await fetch(configUrl);
      config = await response.json();
    } catch (error) {
      console.error("Error loading config file:", error);
      return;
    }
  } else {
    console.error("No config file provided. Please set a data-config attribute on the script tag.");
    return;
  }

  // --- Outer scope variables for camera state ---
  let cameraInstance = null;
  let controlsInstance = null;
  let initialCameraPosition = null;
  let initialCameraRotation = null;
  
  // Generate a unique identifier for this widget instance.
  const instanceId = Math.random().toString(36).substr(2, 8);
  
  // Read required URLs and parameters from the config.
  // The gifUrl is no longer used.
  var plyUrl = config.ply_url;
  
  // Optional parameters for zoom and rotation limits.
  var minZoom = parseFloat(config.minZoom || "0");
  var maxZoom = parseFloat(config.maxZoom || "20");
  var minAngle = parseFloat(config.minAngle || "0");
  var maxAngle = parseFloat(config.maxAngle || "360");
  
  // Determine the aspect ratio.
  var aspectPercent = "100%";
  if (config.aspect) {
    if (config.aspect.indexOf(":") !== -1) {
      var parts = config.aspect.split(":");
      var w = parseFloat(parts[0]);
      var h = parseFloat(parts[1]);
      if (!isNaN(w) && !isNaN(h) && w > 0) {
        aspectPercent = (h / w * 100) + "%";
      }
    } else {
      var aspectValue = parseFloat(config.aspect);
      if (!isNaN(aspectValue) && aspectValue > 0) {
        aspectPercent = (100 / aspectValue) + "%";
      }
    }
  } else {
    var parentContainer = scriptTag.parentNode;
    var containerWidth = parentContainer.offsetWidth;
    var containerHeight = parentContainer.offsetHeight;
    if (containerWidth > 0 && containerHeight > 0) {
      aspectPercent = (containerHeight / containerWidth * 100) + "%";
    }
  }
  
  var isIOS = /iPad|iPhone|iPod/.test(navigator.userAgent) && !window.MSStream;
  
  // Inject CSS styles into the document head.
  var styleEl = document.createElement('style');
  styleEl.textContent = `
    /* Widget container styling */
    #ply-widget-container-${instanceId} {
      position: relative;
      width: 100%;
      height: 0;
      padding-bottom: ${aspectPercent};
    }
    /* When in fake fullscreen mode (iOS fallback) */
    #ply-widget-container-${instanceId}.fake-fullscreen {
      position: fixed !important;
      top: 0 !important;
      left: 0 !important;
      width: 100vw !important;
      height: 100vh !important;
      padding-bottom: 0 !important;
      z-index: 9999 !important;
    }
    /* Viewer Container styling */
    #viewer-container-${instanceId} {
      display: block;
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: #FEFEFD;
      border: 1px solid #474558;
      border-radius: 10px;
    }
    /* Canvas fills the viewer container */
    #canvas-${instanceId} {
      width: 100%;
      height: 100%;
      display: block;
    }
    /* Progress dialog styling */
    #progress-dialog-${instanceId} {
      position: absolute;
      top: 50%;
      left: 50%;
      transform: translate(-50%, -50%);
      border: none;
      background: rgba(255,255,255,0.9);
      padding: 20px;
      border-radius: 5px;
      z-index: 1000;
      display: none;
    }
    /* Menu (instructions) content styling */
    #menu-content-${instanceId} {
      display: none;
      position: absolute;
      top: 70px;
      right: 15px;
      background: #FFFEF4;
      border: 1px solid #474558;
      border-radius: 5px;
      padding: 10px;
      font-size: 15px;
      line-height: 1.4;
      color: #474558;
    }
    /* Button styling */
    .widget-button {
      position: absolute;
      width: 45px;
      height: 45px;
      background-color: #FFFEF4;
      border: 1px solid #474558;
      border-radius: 50%;
      cursor: pointer;
      font-size: 14px;
      color: #474558;
      display: flex;
      align-items: center;
      justify-content: center;
    }
    #fullscreen-toggle-${instanceId} {
      top: 17px;
      right: 15px;
    }
    #help-toggle-${instanceId} {
      top: 17px;
      right: 70px;
      font-size: 22px;
    }
    #reset-camera-btn-${instanceId} {
      top: 17px;
      right: 123px;
      font-size: 22px;
      line-height: 1;
      padding: 0;
    }
    .reset-icon {
      display: inline-block;
    }
  `;
  document.head.appendChild(styleEl);
  
  // Create the widget container.
  var widgetContainer = document.createElement('div');
  widgetContainer.id = 'ply-widget-container-' + instanceId;
  widgetContainer.innerHTML = `
    <div id="viewer-container-${instanceId}">
      <canvas id="canvas-${instanceId}"></canvas>
      <div id="progress-dialog-${instanceId}">
        <progress id="progress-indicator-${instanceId}" max="100" value="0"></progress>
      </div>
      <button id="fullscreen-toggle-${instanceId}" class="widget-button">⇱</button>
      <button id="help-toggle-${instanceId}" class="widget-button">?</button>
      <button id="reset-camera-btn-${instanceId}" class="widget-button">
        <span class="reset-icon">⟲</span>
      </button>
      <div id="menu-content-${instanceId}">
        - Rotate with right click<br>
        - Zoom in/out with middle click<br>
        - Translate with left click
      </div>
    </div>
  `;
  scriptTag.parentNode.appendChild(widgetContainer);
  
  // Grab element references.
  var viewerContainer = document.getElementById('viewer-container-' + instanceId);
  var fullscreenToggle = document.getElementById('fullscreen-toggle-' + instanceId);
  var helpToggle = document.getElementById('help-toggle-' + instanceId);
  var resetCameraBtn = document.getElementById('reset-camera-btn-' + instanceId);
  var menuContent = document.getElementById('menu-content-' + instanceId);
  var canvas = document.getElementById('canvas-' + instanceId);
  var progressDialog = document.getElementById('progress-dialog-' + instanceId);
  var progressIndicator = document.getElementById('progress-indicator-' + instanceId);
  
  // --- Button Event Handlers ---
  fullscreenToggle.addEventListener('click', function() {
    if (isIOS) {
      widgetContainer.classList.toggle('fake-fullscreen');
      fullscreenToggle.textContent = widgetContainer.classList.contains('fake-fullscreen') ? '⇲' : '⇱';
    } else {
      if (!document.fullscreenElement) {
        widgetContainer.requestFullscreen ? widgetContainer.requestFullscreen() : null;
      } else {
        document.exitFullscreen ? document.exitFullscreen() : null;
      }
    }
  });
  
  document.addEventListener('fullscreenchange', function() {
    fullscreenToggle.textContent = (document.fullscreenElement === widgetContainer) ? '⇲' : '⇱';
  });
  
  helpToggle.addEventListener('click', function(e) {
    e.stopPropagation();
    menuContent.style.display = (menuContent.style.display === 'block') ? 'none' : 'block';
  });
  
  // Reset button now restores the camera to its original position,
  // as captured when the viewer was initialized.
  resetCameraBtn.addEventListener('click', function() {
    console.log("Reset camera button clicked.");
    if (cameraInstance && initialCameraPosition && initialCameraRotation) {
      cameraInstance.position = initialCameraPosition.clone();
      cameraInstance.rotation = initialCameraRotation.clone();
      if (typeof cameraInstance.update === 'function') {
        cameraInstance.update();
      }
      if (controlsInstance && typeof controlsInstance.update === 'function') {
        controlsInstance.update();
      }
    }
  });
  
  // --- Initialize the 3D PLY Viewer ---
  async function initializeViewer() {
    const SPLAT = await import("https://cdn.jsdelivr.net/npm/gsplat@latest");
    progressDialog.style.display = 'block';
    const renderer = new SPLAT.WebGLRenderer(canvas);
    const scene = new SPLAT.Scene();
    
    // Create the camera using default initialization.
    const camera = new SPLAT.Camera();
    
    // Create OrbitControls after the camera is created.
    const controls = new SPLAT.OrbitControls(camera, canvas);
    
    cameraInstance = camera;
    controlsInstance = controls;
    // Capture the camera's initial values.
    initialCameraPosition = camera.position.clone();
    initialCameraRotation = camera.rotation.clone();
  
    canvas.style.background = "#FEFEFD";
    controls.maxZoom = maxZoom;
    controls.minZoom = minZoom;
    controls.minAngle = minAngle;
    controls.maxAngle = maxAngle;
  
    controls.update();
  
    try {
      await SPLAT.PLYLoader.LoadAsync(
        plyUrl,
        scene,
        (progress) => {
          progressIndicator.value = progress * 100;
        }
      );
      progressDialog.style.display = 'none';
    } catch (error) {
      console.error("Error loading PLY file:", error);
      progressDialog.innerHTML = `<p style="color: red">Error loading model: ${error.message}</p>`;
    }
  
    const frame = () => {
      controls.update();
      renderer.render(scene, camera);
      requestAnimationFrame(frame);
    };
  
    const handleResize = () => {
      renderer.setSize(canvas.clientWidth, canvas.clientHeight);
    };
  
    handleResize();
    window.addEventListener("resize", handleResize);
    requestAnimationFrame(frame);
  }
  
  // Initialize the viewer immediately.
  initializeViewer();
})();