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index.html
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index.html
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<!DOCTYPE html>
<html lang="en">
<head>
<title>Pretty Binary Tree</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<link rel="shortcut icon" href="assets/favicon.ico" type="image/x-icon"/>
<link rel="stylesheet" href="css/style.css">
</head>
<body>
<h4><a href="https://www.github.com/ggorlen/prettybt">prettybt</a></h4>
<p>
Enter binary tree as comma-delimited array with<br> `<code>null</code>` for absent
nodes or <a id="random-tree" href="javascript:void(0);">make a random tree</a>:
</p>
<div class="input-wrapper">
<div><label>[<input id="entry">]</label></div>
<div><label>size: <input size="2" id="size" value="17"></label></div>
<div><label>night: <input id="night" type="checkbox"></label></div>
</div>
<canvas id="tree"></canvas>
<script src="js/pbt.js"></script>
<script>
(function () {
const light = "#f5f5f5";
const dark = "#252525";
const clamp = (n, lo=7, hi=40) => Math.min(hi, Math.max(n, lo));
const drawTree = () => {
PrettyBT.drawBinaryTree(treeElem, root, {
size: clamp(+sizeElem.value),
background: night ? dark : light,
nodeColor: night ? dark : light,
textColor: night ? light : dark,
strokeColor: "#777",
});
};
const toggleNight = () => {
document.documentElement.classList.toggle("dark");
};
const sizeElem = document.querySelector("#size");
const entryElem = document.querySelector("#entry");
const treeElem = document.querySelector("#tree");
const nightElem = document.querySelector("#night");
let night = nightElem.checked;
if (night) {
toggleNight();
}
let root = entryElem.value
? PrettyBT.treeFromString(entryElem.value)
: PrettyBT.randomTree();
entryElem.value =
entryElem.value || PrettyBT.arrayFromTree(root).toString();
drawTree();
document.querySelector("#random-tree").addEventListener("click", e => {
root = PrettyBT.randomTree();
entryElem.value = PrettyBT.arrayFromTree(root).toString();
drawTree();
});
entryElem.addEventListener("keyup", e => {
e.target.style.width = Math.max(e.target.value.length, 20) + "ch";
root = PrettyBT.treeFromString(e.target.value);
drawTree();
});
sizeElem.addEventListener("keyup", e => {
e.target.style.width = Math.max(e.target.value.length, 2) + "ch";
drawTree();
});
nightElem.addEventListener("click", e => {
night = e.target.checked;
toggleNight();
drawTree();
});
})();
</script>
</body>
</html>