Java Robot is a part of Java AWT (Abstract Window Toolkit ) package . Java Robot is used to generate native system input events for the purposes of test automation, self-running demos, and other applications where control of the mouse and keyboard is needed. The purpose of using Java Robot is to gain the control of input events such as mouse, keyboard etc.
In this article we will create a Magnifying toolusing JAVA Robot .
Methods used :Â
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- getPointerInfo() : Returns a PointerInfo instance that represents the current location of the mouse pointer.
- getLocation() : returns a point instance that represents location
- createScreenCapture(Rectangle r) : captures a part of screen which is within the rectangle r.
- drawImage(Image i, int x, int y, ImageObserver o) : draws an image at x, y position on the screen specifying an image observer
- drawImage(Image i, int x, int y,,int w, int h, ImageObserver o) : draws an image at x, y position and specified width and height on the screen specifying an image observer
Java program to create a Magnifying tool using Java RobotÂ
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Java
// Java program to create a Magnifying tool// using Java RobotÂ
import java.awt.event.*;import javax.swing.*;import java.awt.*;class magnify extends JFrame {Â
    // object    static magnify m;Â
    // image    Image i;Â
    // default constructor    magnify()    {        // create a frame        super("magnify");Â
        // set size of frame        setSize(200, 220);        show();Â
        // function to magnify the image        work();    }Â
    // main function    public static void main(String args[])    {Â
        // object of class        m = new magnify();    }Â
    public void work()    {        try {            // create a robot            Robot r = new Robot();Â
            // while the frame is visible            while (isVisible()) {                // get the position of mouse                Point p = MouseInfo.getPointerInfo().getLocation();Â
                // create a screen capture around the mouse pointer                i = r.createScreenCapture(new Rectangle((int)p.getX() - 30,                                                        (int)p.getY() - 30, 150, 150));Â
                // repaint the container                repaint();            }            // exit the program            System.exit(0);        }        catch (Exception e) {            System.err.println(e.getMessage());        }    }Â
    // paint function    public void paint(Graphics g)    {Â
        // draw the image        g.drawImage(i, 0, 0, 300, 300, this);    }} |
Output :Â
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Note: the following program might not run in an online compiler please use an offline IDE.Please use a latest version of java
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