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Create a virtual whiteboard snapshot saver

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in

Computer Science

To create a Virtual Whiteboard Snapshot Saver, you’ll need a combination of front-end drawing tools and backend logic to save snapshots as images. Below is a simplified implementation using HTML, JavaScript, and Canvas API. It enables users to draw on a whiteboard and save a snapshot as an image.

✅ Features:

Virtual whiteboard using <canvas>
Drawing with mouse
Button to save current whiteboard state as a PNG

📄 HTML + JavaScript Code:

html
<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8" />
  <meta name="viewport" content="width=device-width, initial-scale=1.0"/>
  <title>Virtual Whiteboard Snapshot Saver</title>
  <style>
    body {
      display: flex;
      flex-direction: column;
      align-items: center;
      font-family: sans-serif;
      background: #f0f0f0;
      padding: 20px;
    }
    canvas {
      border: 2px solid #333;
      background-color: #fff;
      cursor: crosshair;
    }
    button {
      margin-top: 15px;
      padding: 10px 20px;
      font-size: 16px;
      cursor: pointer;
    }
  </style>
</head>
<body>
  <h2>Virtual Whiteboard</h2>
  <canvas id="whiteboard" width="800" height="500"></canvas>
  <button id="saveBtn">Save Snapshot</button>

  <script>
    const canvas = document.getElementById('whiteboard');
    const ctx = canvas.getContext('2d');
    let drawing = false;

    canvas.addEventListener('mousedown', () => drawing = true);
    canvas.addEventListener('mouseup', () => drawing = false);
    canvas.addEventListener('mouseout', () => drawing = false);

    canvas.addEventListener('mousemove', draw);

    function draw(e) {
      if (!drawing) return;

      ctx.lineWidth = 2;
      ctx.lineCap = 'round';
      ctx.strokeStyle = '#000';

      const rect = canvas.getBoundingClientRect();
      const x = e.clientX - rect.left;
      const y = e.clientY - rect.top;

      ctx.lineTo(x, y);
      ctx.stroke();
      ctx.beginPath();
      ctx.moveTo(x, y);
    }

    document.getElementById('saveBtn').addEventListener('click', () => {
      const dataURL = canvas.toDataURL('image/png');
      const link = document.createElement('a');
      link.href = dataURL;
      link.download = 'whiteboard_snapshot.png';
      link.click();
    });
  </script>
</body>
</html>

🛠 How It Works:

You draw on the whiteboard using your mouse.
When you click the “Save Snapshot” button, it converts the canvas to a PNG data URL and triggers a download.

🔧 Optional Enhancements:

Add color and brush size selectors.
Implement undo/redo with stack arrays.
Allow saving in multiple formats (JPEG, SVG).
Store snapshots in localStorage or backend via API.

Let me know if you want enhancements like collaborative whiteboard (with real-time sharing) or cloud save support.

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