JSFiddle - React, Tailwind, and code Playground

by Magayaga

HTML

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Smart Stylus Calculator</title>
    <style>
        body {
            font-family: Arial, sans-serif;
            text-align: center;
        }
        canvas {
            border: 2px solid #000;
            touch-action: none;
        }
        #result {
            font-size: 24px;
            margin-top: 10px;
        }
    </style>
</head>
<body>
    <h2>Smart Stylus Calculator</h2>
    <canvas id="drawCanvas" width="300" height="150"></canvas>
    <br>
    <button onclick="clearCanvas()">Clear</button>
    <button onclick="recognizeExpression()">Compute</button>
    <p id="result">Result: </p>

    <script>
        const canvas = document.getElementById("drawCanvas");
        const ctx = canvas.getContext("2d");
        let isDrawing = false;
        let strokes = [];

        canvas.addEventListener("pointerdown", (e) => {
            isDrawing = true;
            ctx.beginPath();
            ctx.moveTo(e.offsetX, e.offsetY);
        });

        canvas.addEventListener("pointermove", (e) => {
            if (isDrawing) {
                ctx.lineTo(e.offsetX, e.offsetY);
                ctx.stroke();
            }
        });

        canvas.addEventListener("pointerup", () => {
            isDrawing = false;
        });

        function clearCanvas() {
            ctx.clearRect(0, 0, canvas.width, canvas.height);
            document.getElementById("result").innerText = "Result: ";
        }

        async function recognizeExpression() {
            // Convert canvas to image data for OCR processing
            const dataUrl = canvas.toDataURL();
            
            // Placeholder for real handwriting recognition API (e.g., MathPix, Google ML Kit)
            const recognizedText = prompt("Enter your handwritten math expression manually:");
            
            if (recognizedText) {
          ...