added a basic data explorer to the main working code. Use the Key (i) to launch it.

steps/index.html

@@ -8,6 +8,8 @@
   <link rel="icon" type="image/png" sizes="32x32" href="favicon.png" />
   <script src="https://cdn.tailwindcss.com"></script>
   <script src="https://unpkg.com/oboe@2.1.5/dist/oboe-browser.min.js"></script>
+  <script src="https://cdn.jsdelivr.net/npm/chart.js"></script>
+  <script src="https://cdn.jsdelivr.net/npm/ag-grid-community/dist/ag-grid-community.min.js"></script>
   <script>
     tailwind.config = {
       darkMode: "class",
@@ -147,7 +149,7 @@
               id="toggle-debug2-overlay" class="form-checkbox h-4 w-4 text-blue-600 rounded focus:ring-blue-500" /> Show
             Advanced Debug (A)</label>
           <label class="flex items-center gap-2 text-sm cursor-pointer"><input type="checkbox" id="toggle-close-up"
-              class="form-checkbox h-4 w-4 text-blue-600 rounded focus:ring-blue-500" />    GOD MODE </label>
+              class="form-checkbox h-4 w-4 text-blue-600 rounded focus:ring-blue-500" /> GOD MODE </label>
           <label class="flex items-center gap-2 text-sm cursor-pointer"><input type="checkbox" id="toggle-predicted-pos"
               class="form-checkbox h-4 w-4 text-blue-600 rounded focus:ring-blue-500" checked /> Show Predicted Position
             (P)</label>
@@ -262,6 +264,38 @@
         </p>
       </div>
     </div>
+    <div id="data-explorer-panel"
+      class="hidden fixed bottom-24 right-4 bg-white dark:bg-gray-800 shadow-2xl rounded-lg z-30 flex flex-col w-full max-w-2xl h-1/2 border dark:border-gray-600">
+
+      <div class="flex items-center justify-between p-2 border-b dark:border-gray-700">
+        <h2 class="text-lg font-bold ml-2">Data Explorer</h2>
+        <button id="close-explorer-btn"
+          class="text-gray-500 dark:text-gray-400 hover:bg-gray-200 dark:hover:bg-gray-700 rounded-lg p-1.5">&times;</button>
+      </div>
+
+      <div class="flex border-b dark:border-gray-700">
+        <button id="tab-btn-tree" class="px-4 py-2 text-sm font-medium border-b-2 border-blue-500">Tree View</button>
+        <button id="tab-btn-grid" class="px-4 py-2 text-sm font-medium text-gray-500 dark:text-gray-400">Grid
+          View</button>
+        <button id="tab-btn-plot" class="px-4 py-2 text-sm font-medium text-gray-500 dark:text-gray-400">Plot
+          View</button>
+      </div>
+
+      <div class="flex-grow p-2 overflow-auto">
+        <div id="tab-panel-tree" class="font-mono text-xs"></div>
+        <div id="tab-panel-grid" class="hidden h-full">
+          <div id="data-grid" class="ag-theme-alpine-dark h-full"></div>
+        </div>
+        <div id="tab-panel-plot" class="hidden p-2">
+          <canvas id="data-chart"></canvas>
+        </div>
+      </div>
+
+      <div id="explorer-footer" class="p-2 border-t dark:border-gray-700 text-right hidden">
+        <button id="plot-selected-btn"
+          class="bg-blue-600 text-white px-3 py-1 rounded-lg text-sm hover:bg-blue-700">Plot Selected Column</button>
+      </div>
+    </div>
   </main>
 
   <footer class="bg-white dark:bg-gray-800 shadow-up w-full p-4 mt-auto sticky bottom-0 z-20">

steps/src/dataExplorer.js

@@ -0,0 +1,148 @@
+// In src/dataExplorer.js
+
+import { appState } from './state.js';
+
+// --- DOM Elements ---
+const panel = document.getElementById('data-explorer-panel');
+const closeBtn = document.getElementById('close-explorer-btn');
+const footer = document.getElementById('explorer-footer');
+const plotBtn = document.getElementById('plot-selected-btn');
+
+const tabs = {
+    tree: { btn: document.getElementById('tab-btn-tree'), panel: document.getElementById('tab-panel-tree') },
+    grid: { btn: document.getElementById('tab-btn-grid'), panel: document.getElementById('tab-panel-grid') },
+    plot: { btn: document.getElementById('tab-btn-plot'), panel: document.getElementById('tab-panel-plot') },
+};
+
+const gridDiv = document.getElementById('data-grid');
+const chartCanvas = document.getElementById('data-chart');
+
+let gridApi = null; // This will hold the grid's API
+let chartInstance = null;
+let currentGridData = null;
+
+// --- AG Grid Configuration ---
+const gridOptions = {
+    rowData: [],
+    columnDefs: [],
+    defaultColDef: {
+        sortable: true,
+        filter: true,
+        resizable: true,
+    },
+    // The onGridReady callback is no longer needed with the new createGrid method.
+};
+
+// --- Chart.js Configuration ---
+function createChart(data, label) {
+    if (chartInstance) {
+        chartInstance.destroy();
+    }
+    chartInstance = new Chart(chartCanvas, {
+        type: 'line',
+        data: {
+            labels: data.map((_, i) => i),
+            datasets: [{
+                label: label,
+                data: data,
+                borderColor: 'rgba(75, 192, 192, 1)',
+                tension: 0.1,
+            }]
+        },
+        options: {
+            responsive: true,
+            maintainAspectRatio: false,
+        }
+    });
+}
+
+// --- Core Functions ---
+
+function switchTab(targetTab) {
+    Object.values(tabs).forEach(tab => {
+        tab.panel.classList.add('hidden');
+        tab.btn.classList.remove('border-blue-500');
+        tab.btn.classList.add('text-gray-500', 'dark:text-gray-400');
+    });
+
+    tabs[targetTab].panel.classList.remove('hidden');
+    tabs[targetTab].btn.classList.add('border-blue-500');
+    tabs[targetTab].btn.classList.remove('text-gray-500', 'dark:text-gray-400');
+
+    footer.classList.toggle('hidden', targetTab !== 'grid');
+}
+
+function createTreeView(data) {
+    const pre = document.createElement('pre');
+    pre.textContent = JSON.stringify(data, (key, value) => {
+        if (key.startsWith('_')) return undefined;
+        return value;
+    }, 2);
+    return pre;
+}
+
+export function showExplorer() {
+    panel.classList.remove('hidden');
+    updateExplorer();
+}
+
+export function hideExplorer() {
+    panel.classList.add('hidden');
+}
+
+export function updateExplorer() {
+    if (panel.classList.contains('hidden')) return;
+    const frame = appState.vizData?.radarFrames[appState.currentFrame];
+    if (!frame) return;
+    tabs.tree.panel.innerHTML = '';
+    tabs.tree.panel.appendChild(createTreeView({
+        currentFrame: appState.currentFrame,
+        frameData: frame
+    }));
+}
+
+export function displayInGrid(data, title) {
+    if (!data || data.length === 0 || !gridApi) return;
+
+    currentGridData = data;
+    const columns = Object.keys(data[0]).map(key => ({ field: key }));
+    
+    gridApi.setGridOption('columnDefs', columns);
+    gridApi.setGridOption('rowData', data);
+    
+    tabs.grid.btn.textContent = `Grid View: ${title}`;
+    switchTab('grid');
+}
+
+// --- Event Listeners ---
+closeBtn.addEventListener('click', hideExplorer);
+
+Object.keys(tabs).forEach(key => {
+    tabs[key].btn.addEventListener('click', () => switchTab(key));
+});
+
+plotBtn.addEventListener('click', () => {
+    // --- START: MODIFIED LOGIC ---
+    const focusedCell = gridApi.getFocusedCell();
+    if (!focusedCell) {
+        alert("Please click a column header to select it for plotting.");
+        return;
+    }
+    
+    const colId = focusedCell.column.getColId();
+    // --- END: MODIFIED LOGIC ---
+
+    const plotData = currentGridData.map(row => row[colId]).filter(val => typeof val === 'number');
+
+    if (plotData.length > 0) {
+        createChart(plotData, colId);
+        switchTab('plot');
+    } else {
+        alert("The selected column contains no numeric data to plot.");
+    }
+});
+
+// --- START: THIS IS THE MAIN FIX ---
+// Initialize the grid using the new createGrid method and store its API.
+gridApi = agGrid.createGrid(gridDiv, gridOptions);
+// --- END: THIS IS THE MAIN FIX ---

steps/src/main.js

@@ -17,6 +17,7 @@
 // ===========================================================================================================
 
 import { zoomSketch } from "./p5/zoomSketch.js";
+import { showExplorer, hideExplorer, displayInGrid } from "./dataExplorer.js";
 import {
   showModal,
   hideModal,
@@ -336,10 +337,9 @@ function finalizeSetup(_parsedJsonData) {
     if (!appState.speedGraphInstance) {
       appState.speedGraphInstance = new p5(speedGraphSketch);
     }
-    
     // The previous logic for setting the frame and redrawing was correct.
     // It failed because the underlying timestamp data was wrong.
-    resetVisualization(); 
+    resetVisualization();
     appState.speedGraphInstance.setData(appState.vizData, videoPlayer.duration);
     appState.speedGraphInstance.redraw();
   }
@@ -945,6 +945,7 @@ document.addEventListener("keydown", (event) => {
     "m",
     "q",
     "c",
+    "i",
   ];
 
   if (!appState.vizData || !recognizedKeys.includes(key)) {
@@ -1011,7 +1012,14 @@ document.addEventListener("keydown", (event) => {
       appState.p5_instance.redraw();
     }
   }
-
+  if (key === "i") {
+    const panel = document.getElementById("data-explorer-panel");
+    if (panel.classList.contains("hidden")) {
+      showExplorer();
+    } else {
+      hideExplorer();
+    }
+  }
   if (key === "p") {
     togglePredictedPos.click();
     appState.p5_instance.redraw();
@@ -1042,6 +1050,18 @@ document.addEventListener("keydown", (event) => {
   }
 });
 
+canvasContainer.addEventListener('click', () => {
+    if (!appState.vizData) return;
+
+    // For this example, let's just send the pointCloud of the current frame to the grid.
+    // A more advanced version could detect if you clicked on a specific track.
+    const currentFrameData = appState.vizData.radarFrames[appState.currentFrame];
+
+    if (currentFrameData && currentFrameData.pointCloud) {
+        displayInGrid(currentFrameData.pointCloud, `Frame ${appState.currentFrame} - Point Cloud`);
+    }
+});
+
 function calculateAndSetOffset() {
   const jsonTimestampInfo = extractTimestampInfo(appState.jsonFilename);
   const videoTimestampInfo = extractTimestampInfo(appState.videoFilename);
@@ -1050,8 +1070,8 @@ function calculateAndSetOffset() {
       videoTimestampInfo.timestampStr,
       videoTimestampInfo.format
     );
-    if (appState.videoStartDate){
-  };
+    if (appState.videoStartDate) {
+    }
   }
 
   if (jsonTimestampInfo) {