Write a program to display current cursor position of the mouse pointer on an Applet using MouseMotionListener interface.

Question

**Write a program to display current cursor position of the mouse pointer on an Applet using MouseMotionListener interface.**

Accepted Answer

# Answer: Java Applet Program to Track Mouse Cursor Position ## 1. Overview In Java AWT/Applet programming, tracking mouse movement is handled by the **`MouseMotionListener`** interface from the `java.awt.event` package. The `MouseMotionListener` interface provides two callback methods: 1. **`mouseMoved(MouseEvent e)`:** Invoked every time the mouse cursor moves within the Applet component boundaries without buttons pressed. 2. **`mouseDragged(MouseEvent e)`:** Invoked when the mouse is moved while a mouse button is pressed. ```text [ User Moves Mouse ] ---> [ MouseEvent Fired ] ---> [ mouseMoved(e) extracts X, Y ] ---> [ repaint() ] ---> [ paint(g) draws text ] ``` --- ## 2. Complete Java Applet Code ```java import java.applet.Applet; import java.awt.Color; import java.awt.Font; import java.awt.Graphics; import java.awt.event.MouseEvent; import java.awt.event.MouseMotionListener; /* */ public class MouseTrackerApplet extends Applet implements MouseMotionListener { // Variables to store mouse cursor coordinates and status private int mouseX = 0; private int mouseY = 0; private String statusMsg = "Move the mouse inside this Applet window..."; // Initialization method of Applet life cycle @Override public void init() { // Set Applet background and foreground colors setBackground(new Color(245, 246, 242)); setForeground(new Color(27, 36, 48)); setFont(new Font("SansSerif", Font.BOLD, 14)); // Register the Applet to listen to mouse motion events addMouseMotionListener(this); } // Invoked when the mouse is moved without pressing any button @Override public void mouseMoved(MouseEvent e) { mouseX = e.getX(); // Get current X coordinate mouseY = e.getY(); // Get current Y coordinate statusMsg = "Mouse Moving at: X = " + mouseX + ", Y = " + mouseY; repaint(); // Request JVM to re-render the Applet screen } // Invoked when the mouse is dragged with a button pressed @Override public void mouseDragged(MouseEvent e) { mouseX = e.getX(); mouseY = e.getY(); statusMsg = "Mouse Dragged at: X = " + mouseX + ", Y = " + mouseY; repaint(); // Request JVM to re-render } // Paint method to render graphics and text on the screen @Override public void paint(Graphics g) { // Display header banner g.setColor(new Color(31, 75, 67)); g.fillRect(20, 20, 460, 40); g.setColor(Color.WHITE); g.drawString("JAVA APPLET MOUSE POSITION TRACKER", 80, 45); // Display current cursor coordinates g.setColor(new Color(178, 58, 46)); g.drawString(statusMsg, 30, 100); // Draw crosshair indicator at current cursor position if (mouseX > 0 && mouseY > 0) { g.setColor(Color.BLUE); g.drawOval(mouseX - 10, mouseY - 10, 20, 20); // Circle around cursor g.drawLine(mouseX - 15, mouseY, mouseX + 15, mouseY); // Horizontal line g.drawLine(mouseX, mouseY - 15, mouseX, mouseY + 15); // Vertical line // Draw small coordinate tooltip near cursor g.setFont(new Font("Monospaced", Font.PLAIN, 11)); g.drawString("(" + mouseX + ", " + mouseY + ")", mouseX + 12, mouseY - 8); } } } ``` --- ## 3. HTML Code to Embed the Applet (`index.html`) ```html Mouse Motion Applet

Java Applet: Real-Time Mouse Pointer Coordinates

Your browser does not support Java Applets. ``` --- ## 4. Execution Steps 1. **Compile the Applet:** ```bash javac MouseTrackerApplet.java ``` 2. **Run using AppletViewer (JDK tool):** ```bash appletviewer MouseTrackerApplet.java ``` *(Or open `index.html` in an applet-compatible browser environment).* --- ## 5. Method Responsibilities Summary | Method | Role | |---|---| | `init()` | Configures background color and attaches `addMouseMotionListener(this)`. | | `mouseMoved(MouseEvent e)` | Extracts $(X, Y)$ using `e.getX()` and `e.getY()` when cursor is moving freely, then calls `repaint()`. | | `mouseDragged(MouseEvent e)` | Extracts $(X, Y)$ during drag gestures. | | `paint(Graphics g)` | Draws status text and crosshair graphics using coordinates onto the graphics context. |

Method	Role
`init()`	Configures background color and attaches `addMouseMotionListener(this)`.
`mouseMoved(MouseEvent e)`	Extracts $(X, Y)$ using `e.getX()` and `e.getY()` when cursor is moving freely, then calls `repaint()`.
`mouseDragged(MouseEvent e)`	Extracts $(X, Y)$ during drag gestures.
`paint(Graphics g)`	Draws status text and crosshair graphics using coordinates onto the graphics context.

Answer: Java Applet Program to Track Mouse Cursor Position

1. Overview

2. Complete Java Applet Code

3. HTML Code to Embed the Applet (index.html)

4. Execution Steps

5. Method Responsibilities Summary

Similar questions

3. HTML Code to Embed the Applet (`index.html`)