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