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btree.html (2960B)

      1 <!doctype html>
      2 
      3 <title>CodeMirror: B-Tree visualization</title>
      4 <meta charset="utf-8"/>
      5 <link rel=stylesheet href="../doc/docs.css">
      6 
      7 <link rel="stylesheet" href="../lib/codemirror.css">
      8 <script src="../lib/codemirror.js"></script>
      9 <style type="text/css">
     10       .lineblock { display: inline-block; margin: 1px; height: 5px; }
     11       .CodeMirror {border: 1px solid #aaa; height: 400px}
     12     </style>
     13 <div id=nav>
     14   <a href="http://codemirror.net"><h1>CodeMirror</h1><img id=logo src="../doc/logo.png"></a>
     15 
     16   <ul>
     17     <li><a href="../index.html">Home</a>
     18     <li><a href="../doc/manual.html">Manual</a>
     19     <li><a href="https://github.com/codemirror/codemirror">Code</a>
     20   </ul>
     21   <ul>
     22     <li><a class=active href="#">B-Tree visualization</a>
     23   </ul>
     24 </div>
     25 
     26 <article>
     27 <h2>B-Tree visualization</h2>
     28 <form><textarea id="code" name="code">type here, see a summary of the document b-tree below</textarea></form>
     29       <div style="display: inline-block; height: 402px; overflow-y: auto" id="output"></div>
     30 
     31     <script id="me">
     32 var editor = CodeMirror.fromTextArea(document.getElementById("code"), {
     33   lineNumbers: true,
     34   lineWrapping: true
     35 });
     36 var updateTimeout;
     37 editor.on("change", function(cm) {
     38   clearTimeout(updateTimeout);
     39   updateTimeout = setTimeout(updateVisual, 200);
     40 });
     41 updateVisual();
     42 
     43 function updateVisual() {
     44   var out = document.getElementById("output");
     45   out.innerHTML = "";
     46 
     47   function drawTree(out, node) {
     48     if (node.lines) {
     49       out.appendChild(document.createElement("div")).innerHTML =
     50         "<b>leaf</b>: " + node.lines.length + " lines, " + Math.round(node.height) + " px";
     51       var lines = out.appendChild(document.createElement("div"));
     52       lines.style.lineHeight = "6px"; lines.style.marginLeft = "10px";
     53       for (var i = 0; i < node.lines.length; ++i) {
     54         var line = node.lines[i], lineElt = lines.appendChild(document.createElement("div"));
     55         lineElt.className = "lineblock";
     56         var gray = Math.min(line.text.length * 3, 230), col = gray.toString(16);
     57         if (col.length == 1) col = "0" + col;
     58         lineElt.style.background = "#" + col + col + col;
     59         lineElt.style.width = Math.max(Math.round(line.height / 3), 1) + "px";
     60       }
     61     } else {
     62       out.appendChild(document.createElement("div")).innerHTML =
     63         "<b>node</b>: " + node.size + " lines, " + Math.round(node.height) + " px";
     64       var sub = out.appendChild(document.createElement("div"));
     65       sub.style.paddingLeft = "20px";
     66       for (var i = 0; i < node.children.length; ++i)
     67         drawTree(sub, node.children[i]);
     68     }
     69   }
     70   drawTree(out, editor.getDoc());
     71 }
     72 
     73 function fillEditor() {
     74   var sc = document.getElementById("me");
     75   var doc = (sc.textContent || sc.innerText || sc.innerHTML).replace(/^\s*/, "") + "\n";
     76   doc += doc; doc += doc; doc += doc; doc += doc; doc += doc; doc += doc;
     77   editor.setValue(doc);
     78 }
     79     </script>
     80 
     81 <p><button onclick="fillEditor()">Add a lot of content</button></p>
     82 
     83   </article>