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feat: tree visualizer develop
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5 files changed

+212
-2
lines changed

‎index.html‎

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@@ -8,10 +8,12 @@
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<link rel="stylesheet" href="./src/output.css" />
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</head>
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<body>
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<div id="app">
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<div id="app" class="overflow-hidden">
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<!-- header -->
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<div class="mt-3 text-gray-800 flex flex-col items-center w-full">
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<h1 class="text-xl font-medium font-mono">Leetcode tree visualizer</h1>
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<h1 class="text-xl font-medium font-mono text-center">
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Leetcode tree visualizer
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</h1>
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<!-- public links -->
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<div class="flex space-x-4 mt-2">
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<a
@@ -57,6 +59,7 @@ <h1 class="text-xl font-medium font-mono">Leetcode tree visualizer</h1>
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<!-- Input field to take test case -->
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<!-- place for tree render -->
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<canvas></canvas>
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</div>
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<script type="module" src="/src/main.ts"></script>
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</body>

‎src/data-structures/TreeNode.ts‎

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class TreeNode {
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private data: number | null
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private left: TreeNode | null
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private right: TreeNode | null
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constructor(value: number | null) {
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this.data = value
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this.left = null
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this.right = null
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}
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setLeftNode(node: TreeNode | null) {
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this.left = node
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}
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setRightNode(node: TreeNode | null) {
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this.right = node
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}
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getHeight():number {
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let leftHeight = this.left?.getHeight() || 0
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let rightHeight = this.right?.getHeight() || 0
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return Math.max(leftHeight, rightHeight) + 1;
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}
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getNodeValue(node: TreeNode): number | null {
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return node.data;
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}
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getLeftNode(node: TreeNode): TreeNode {
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if (this.isLeftNodeAvailable(node)) {
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return node.left!;
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}
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return new TreeNode(null);
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}
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getRightNode(node: TreeNode): TreeNode {
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if (node.isRightNodeAvailable(node)) {
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return node.right!;
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}
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return new TreeNode(null);
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}
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isLeftNodeAvailable(node: TreeNode): boolean {
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if(node.left) {
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return true;
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}
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return false;
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}
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isRightNodeAvailable(node: TreeNode): boolean {
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if(node.right) {
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return true;
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}
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return false;
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}
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}
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export default TreeNode;

‎src/main.ts‎

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import TreeNode from "./data-structures/TreeNode";
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import renderTree from "./render/drawTree";
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const canvas = document.querySelector("canvas");
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const root = new TreeNode(10);
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const root1 = new TreeNode(12);
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root.setLeftNode(root1);
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const root2 = new TreeNode(13);
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root.setRightNode(root2);
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const root3 = new TreeNode(13);
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root2.setRightNode(root3);
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root1.setLeftNode(root3);
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const root4 = new TreeNode(11);
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root2.setLeftNode(root4);
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renderTree(root, canvas)

‎src/render/drawTree.ts‎

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import TreeNode from "../data-structures/TreeNode"
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import { CONFIG } from "../utils/tree";
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function renderTree(rootNode: TreeNode, canvasEle: HTMLCanvasElement | null) {
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// set canvas dimension same as window dimension
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const windowWidth = window.innerWidth;
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const windowHeight = window.innerHeight;
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if(canvasEle) {
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canvasEle.width = windowWidth;
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canvasEle.height = windowHeight;
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}
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const { nodeContainerHeight, nodeContainersWidth } = getTreeHeightWidth(rootNode);
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const windowCenter = windowWidth / 2;
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const nodeContainerWidthCenter = nodeContainersWidth / 2;
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const xStart = windowCenter - nodeContainerWidthCenter;
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const xEnd = windowCenter + nodeContainerWidthCenter;
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const horizontalConfig = { xStart, xEnd };
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// Draw tree
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drawTreeRecursively(rootNode, canvasEle, 0.5, horizontalConfig);
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}
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function getTreeHeightWidth(node: TreeNode) {
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const heightOfTree = node.getHeight();
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const maxLeafNodeAtLlevel = Math.pow(2, heightOfTree);
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const nodeContainerHeight = heightOfTree * CONFIG.HEIGHT_SPACING;
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const nodeContainersWidth = maxLeafNodeAtLlevel * CONFIG.WIDTH_SPACING;
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return {
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nodeContainerHeight,
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nodeContainersWidth
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};
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}
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function drawTreeRecursively(node: TreeNode, canvasEle: HTMLCanvasElement | null, currentLevel: number, horizontalConfig: {xStart: number, xEnd: number}) {
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const { xStart, xEnd } = horizontalConfig;
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const xPos = (xStart + xEnd) / 2;
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const yPos = currentLevel * CONFIG.HEIGHT_SPACING;
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const nodeValue = node.getNodeValue(node)?.toString() || "";
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drawNode(nodeValue, canvasEle, xPos, yPos);
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if(node.isLeftNodeAvailable(node)) {
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const leftNodeHorizontalConfig = {xStart, xEnd: xPos};
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drawTreeRecursively(node.getLeftNode(node), canvasEle, currentLevel + 1, leftNodeHorizontalConfig);
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const xCord = { xStart: xPos, xEnd: (xStart + xPos)/2 };
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const yCord = { yStart: yPos + CONFIG.RADIUS, yEnd: ((currentLevel+1)*CONFIG.HEIGHT_SPACING) - CONFIG.RADIUS};
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connectNodesEdge(canvasEle, xCord, yCord )
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}
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if(node.isRightNodeAvailable(node)) {
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const rightNodeHorizontalConfig = {xStart: xPos, xEnd};
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drawTreeRecursively(node.getRightNode(node), canvasEle, currentLevel + 1, rightNodeHorizontalConfig);
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const xCord = { xStart: xPos, xEnd: (xPos + xEnd)/2 };
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const yCord = { yStart: yPos + CONFIG.RADIUS, yEnd: ((currentLevel+1)*CONFIG.HEIGHT_SPACING) - CONFIG.RADIUS};
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connectNodesEdge(canvasEle, xCord, yCord )
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}
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}
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function drawNode(value: string, canvasEle: HTMLCanvasElement | null, x: number, y: number) {
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const context = canvasEle?.getContext("2d");
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// Draw circle
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context?.beginPath();
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context?.arc(x, y, CONFIG.RADIUS, 0, 2*Math.PI, false);
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(context as CanvasRenderingContext2D).fillStyle = "#6a00f4"; // type assertion
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context?.fill();
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// Draw circle border
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context?.arc(x, y, CONFIG.RADIUS, 0, 2*Math.PI, false);
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(context as CanvasRenderingContext2D).strokeStyle = "#10002b"; // type assertion
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(context as CanvasRenderingContext2D).lineWidth = 3;
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context?.stroke();
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// fill the node value
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(context as CanvasRenderingContext2D).font = `bold ${CONFIG.FONT_SIZE}px Arial`;
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(context as CanvasRenderingContext2D).fillStyle = "#f0fff1"; // type assertion
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(context as CanvasRenderingContext2D).textAlign = "center";
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(context as CanvasRenderingContext2D).fillText(value, x, y + (CONFIG.FONT_SIZE/3));
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}
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function connectNodesEdge(canvasEle: HTMLCanvasElement | null, xCord: {xStart: number, xEnd: number}, yCord: {yStart: number, yEnd: number}) {
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const { xStart, xEnd } = xCord;
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const { yStart, yEnd } = yCord;
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const start = { x: xStart, y: yStart };
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const end = { x: xEnd, y: yEnd };
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const context = canvasEle?.getContext("2d");
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context?.beginPath();
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(context as CanvasRenderingContext2D).strokeStyle = "#6a00f4";
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(context as CanvasRenderingContext2D).lineWidth = 2;
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context?.moveTo(start.x, start.y);
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context?.lineTo(end.x, end.y);
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context?.stroke();
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}
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export default renderTree;

‎src/utils/tree.ts‎

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export const CONFIG = {
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RADIUS: 25,
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WIDTH_SPACING: 50,
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HEIGHT_SPACING: 90,
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FONT_SIZE: 14
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}

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