A fully functional Paint application built from scratch using
Java Swing & Graphics2D — inspired by Microsoft Paint.
Made with ❤️ by Laiba Azeem
"Built during the most unexpected uni day ever 😄"
| View |
Preview |
| Paint App with Tools |
 |
| Feature |
Status |
| Freehand Brush Drawing |
✅ |
| Eraser Tool |
✅ |
| Line Drawing |
✅ |
| Rectangle Drawing |
✅ |
| Oval Drawing |
✅ |
| Color Picker |
✅ |
| Brush Size Slider |
✅ |
| Clear Canvas |
✅ |
| Save Drawing |
✅ |
| Multi-color Support |
✅ |
| Smooth Canvas Rendering |
✅ |
| Concept |
How It's Used |
enum ToolType |
Manages tool states cleanly |
CanvasPanel extends JPanel |
Custom drawing canvas |
BufferedImage |
Stores canvas pixel data |
Graphics2D |
Renders all shapes & drawings |
MouseListener |
Detects clicks & drags |
MouseAdapter |
Handles press & release events |
JSlider |
Controls brush size dynamically |
JComboBox |
Color selection dropdown |
| OOP Inheritance |
CanvasPanel extends JPanel |
| Tool |
Action |
| 🖌️ Brush |
Click & drag to draw freely |
| 🧹 Eraser |
Click & drag to erase |
| 📏 Line |
Click & drag for straight lines |
| ⬜ Rectangle |
Click & drag to draw rectangles |
| ⭕ Oval |
Click & drag to draw ovals |
| 🎨 Color |
Pick any color from dropdown |
| 📐 Size |
Drag slider to change brush size |
| 🗑️ Clear |
Wipes entire canvas clean |
| 💾 Save |
Saves your drawing as image |
PaintApp (JFrame)
├── Toolbar (JPanel)
│ ├── Brush Button
│ ├── Eraser Button
│ ├── Line Button
│ ├── Rectangle Button
│ ├── Oval Button
│ ├── Color Picker (JComboBox)
│ ├── Size Slider (JSlider)
│ ├── Clear Button
│ └── Save Button
└── CanvasPanel (JPanel)
├── BufferedImage (canvas)
├── Graphics2D (renderer)
├── MouseListener (input)
└── ToolType enum (state)
- Make sure JDK 8+ is installed
- Clone the repo:
git clone https://github.com/laibaazeem3250-ship-it/java-paint-app.git
- Open in Eclipse IDE
- Run
PaintApp.java
- Start drawing! 🎨
| Date |
What I Built |
| April 10, 2026 |
Full Paint App with 5 tools, color picker, size slider & save feature |
Laiba Azeem
🎓 CS Student | Building real apps while still learning 💪
Came to uni on the most uncertain day of the year
and still shipped code 😄 — dedication level: MAX
