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1 <!doctype html>
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2
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3 <title>CodeMirror: B-Tree visualization</title>
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4 <meta charset="utf-8"/>
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5 <link rel=stylesheet href="../doc/docs.css">
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6
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7 <link rel="stylesheet" href="../lib/codemirror.css">
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8 <script src="../lib/codemirror.js"></script>
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9 <style>
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10 .lineblock { display: inline-block; margin: 1px; height: 5px; }
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11 .CodeMirror {border: 1px solid #aaa; height: 400px}
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12 </style>
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13 <div id=nav>
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14 <a href="https://codemirror.net/5"><h1>CodeMirror</h1><img id=logo src="../doc/logo.png"></a>
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15
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16 <ul>
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17 <li><a href="../index.html">Home</a>
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18 <li><a href="../doc/manual.html">Manual</a>
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19 <li><a href="https://github.com/codemirror/codemirror5">Code</a>
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20 </ul>
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21 <ul>
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22 <li><a class=active href="#">B-Tree visualization</a>
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23 </ul>
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24 </div>
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25
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26 <article>
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27 <h2>B-Tree visualization</h2>
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28 <form><textarea id="code" name="code">type here, see a summary of the document b-tree below</textarea></form>
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29 <div style="display: inline-block; height: 402px; overflow-y: auto" id="output"></div>
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30
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31 <script id="me">
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32 var editor = CodeMirror.fromTextArea(document.getElementById("code"), {
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33 lineNumbers: true,
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34 lineWrapping: true
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35 });
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36 var updateTimeout;
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37 editor.on("change", function(cm) {
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38 clearTimeout(updateTimeout);
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39 updateTimeout = setTimeout(updateVisual, 200);
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40 });
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41 updateVisual();
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42
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43 function updateVisual() {
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44 var out = document.getElementById("output");
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45 out.innerHTML = "";
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46
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47 function drawTree(out, node) {
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48 if (node.lines) {
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49 out.appendChild(document.createElement("div")).innerHTML =
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50 "<b>leaf</b>: " + node.lines.length + " lines, " + Math.round(node.height) + " px";
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51 var lines = out.appendChild(document.createElement("div"));
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52 lines.style.lineHeight = "6px"; lines.style.marginLeft = "10px";
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53 for (var i = 0; i < node.lines.length; ++i) {
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54 var line = node.lines[i], lineElt = lines.appendChild(document.createElement("div"));
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55 lineElt.className = "lineblock";
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56 var gray = Math.min(line.text.length * 3, 230), col = gray.toString(16);
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57 if (col.length == 1) col = "0" + col;
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58 lineElt.style.background = "#" + col + col + col;
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59 lineElt.style.width = Math.max(Math.round(line.height / 3), 1) + "px";
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60 }
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61 } else {
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62 out.appendChild(document.createElement("div")).innerHTML =
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63 "<b>node</b>: " + node.size + " lines, " + Math.round(node.height) + " px";
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64 var sub = out.appendChild(document.createElement("div"));
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65 sub.style.paddingLeft = "20px";
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66 for (var i = 0; i < node.children.length; ++i)
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67 drawTree(sub, node.children[i]);
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68 }
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69 }
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70 drawTree(out, editor.getDoc());
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71 }
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72
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73 function fillEditor() {
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74 var sc = document.getElementById("me");
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75 var doc = (sc.textContent || sc.innerText || sc.innerHTML).replace(/^\s*/, "") + "\n";
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76 doc += doc; doc += doc; doc += doc; doc += doc; doc += doc; doc += doc;
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77 editor.setValue(doc);
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78 }
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79 </script>
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80
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81 <p><button onclick="fillEditor()">Add a lot of content</button></p>
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82
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83 </article>
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