| <!doctype html> |
|
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| <title>CodeMirror: B-Tree visualization</title> |
| <meta charset="utf-8"/> |
| <link rel=stylesheet href="../doc/docs.css"> |
|
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| <link rel="stylesheet" href="../lib/codemirror.css"> |
| <script src="../lib/codemirror.js"></script> |
| <style> |
| .lineblock { display: inline-block; margin: 1px; height: 5px; } |
| .CodeMirror {border: 1px solid #aaa; height: 400px} |
| </style> |
| <div id=nav> |
| <a href="https://codemirror.net"><h1>CodeMirror</h1><img id=logo src="../doc/logo.png"></a> |
|
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| <ul> |
| <li><a href="../index.html">Home</a> |
| <li><a href="../doc/manual.html">Manual</a> |
| <li><a href="https://github.com/codemirror/codemirror">Code</a> |
| </ul> |
| <ul> |
| <li><a class=active href="#">B-Tree visualization</a> |
| </ul> |
| </div> |
|
|
| <article> |
| <h2>B-Tree visualization</h2> |
| <form><textarea id="code" name="code">type here, see a summary of the document b-tree below</textarea></form> |
| <div style="display: inline-block; height: 402px; overflow-y: auto" id="output"></div> |
|
|
| <script id="me"> |
| var editor = CodeMirror.fromTextArea(document.getElementById("code"), { |
| lineNumbers: true, |
| lineWrapping: true |
| }); |
| var updateTimeout; |
| editor.on("change", function(cm) { |
| clearTimeout(updateTimeout); |
| updateTimeout = setTimeout(updateVisual, 200); |
| }); |
| updateVisual(); |
| |
| function updateVisual() { |
| var out = document.getElementById("output"); |
| out.innerHTML = ""; |
| |
| function drawTree(out, node) { |
| if (node.lines) { |
| out.appendChild(document.createElement("div")).innerHTML = |
| "<b>leaf</b>: " + node.lines.length + " lines, " + Math.round(node.height) + " px"; |
| var lines = out.appendChild(document.createElement("div")); |
| lines.style.lineHeight = "6px"; lines.style.marginLeft = "10px"; |
| for (var i = 0; i < node.lines.length; ++i) { |
| var line = node.lines[i], lineElt = lines.appendChild(document.createElement("div")); |
| lineElt.className = "lineblock"; |
| var gray = Math.min(line.text.length * 3, 230), col = gray.toString(16); |
| if (col.length == 1) col = "0" + col; |
| lineElt.style.background = "#" + col + col + col; |
| lineElt.style.width = Math.max(Math.round(line.height / 3), 1) + "px"; |
| } |
| } else { |
| out.appendChild(document.createElement("div")).innerHTML = |
| "<b>node</b>: " + node.size + " lines, " + Math.round(node.height) + " px"; |
| var sub = out.appendChild(document.createElement("div")); |
| sub.style.paddingLeft = "20px"; |
| for (var i = 0; i < node.children.length; ++i) |
| drawTree(sub, node.children[i]); |
| } |
| } |
| drawTree(out, editor.getDoc()); |
| } |
| |
| function fillEditor() { |
| var sc = document.getElementById("me"); |
| var doc = (sc.textContent || sc.innerText || sc.innerHTML).replace(/^\s*/, "") + "\n"; |
| doc += doc; doc += doc; doc += doc; doc += doc; doc += doc; doc += doc; |
| editor.setValue(doc); |
| } |
| </script> |
|
|
| <p><button onclick="fillEditor()">Add a lot of content</button></p> |
|
|
| </article> |
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