Create a fully functional web-based hand-drawn sketchpad app using HTML, CSS, and JavaScript. Requirements:
1. Canvas Drawing Area:
Users can draw with mouse (desktop) and touch input (mobile/tablet).
Must prevent page scrolling and pull-to-refresh while drawing on touch devices.
Drawing strokes should be smooth and anti-aliased (no jagged edges).
2. Toolbar (fixed at top, horizontally scrollable on small screens):
Includes the following buttons:
"Eraser"
"Undo"
"Redo"
"Clear"
"Download"
Includes:
A Color Picker (can use a third-party JS library).
A Brush Type Selector with 11 brush styles:
1. Normal pen
2. Marker
3. Highlighter
4. Calligraphy brush
5. Dashed line
6. Spray paint
7. Pencil (with textured effect)
8. Glow pen (with glow/light effect)
9. Watercolor (semi-transparent blending)
10. Crayon (rough texture)
11. Brush size selector (adjustable stroke width)
Brushes must visually match their real-life style and be smooth in rendering.
3. Download Feature:
The "Download" button must save the drawing as a PNG file.
Filename format: drawing-yyyyMMddHHmmss.png (e.g., drawing-20250511221530.png using current date & time).
The downloaded image's width and height must match the current displayed canvas ratio, ensuring aspect ratio consistency.
4. Responsive and Modern UI:
Use minimalistic and modern design.
Fully mobile-friendly (responsive).
Toolbar should auto-scroll horizontally on small screens.
Add a footer fixed or at the bottom of the page.
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Technical Notes:
Make sure touch events (like touchstart, touchmove) prevent default scrolling behavior.
Use requestAnimationFrame for smoother drawing.
For brushes, simulate texture effects using CanvasRenderingContext2D patterns or pixel manipulation where needed.
Style with CSS Flexbox or Grid for layout, and media queries for responsiveness.
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