MainClass.java Source code

Introduction

Here is the source code for MainClass.java

Source

import java.awt.Container;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Point;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.MouseMotionListener;

import javax.swing.JFrame;
import javax.swing.JPanel;

public class MainClass {

    public static void main(String[] args) {
        JFrame aWindow = new JFrame();
        aWindow.setBounds(200, 200, 200, 200);
        aWindow.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        Container content = aWindow.getContentPane();
        content.add(new MouseMotionEvents());
        aWindow.setVisible(true);
    }
}

class MouseMotionEvents extends JPanel implements MouseListener, MouseMotionListener {
    Point p;

    public MouseMotionEvents() {
        addMouseListener(this);
        addMouseMotionListener(this);
    }

    public void mouseClicked(MouseEvent me) {
    }

    public void mouseEntered(MouseEvent me) {
    }

    public void mouseExited(MouseEvent me) {
    }

    public void mousePressed(MouseEvent me) {
        p = me.getPoint();
        repaint();
    }

    public void mouseReleased(MouseEvent me) {
        p = null;
        repaint();
    }

    public void mouseDragged(MouseEvent me) {
        p = me.getPoint();
        repaint();
    }

    public void mouseMoved(MouseEvent me) {
    }

    public void paint(Graphics g) {
        if (p != null) {
            Dimension d = getSize();
            int xc = d.width / 2;
            int yc = d.height / 2;
            g.drawLine(xc, yc, p.x, p.y);
        }
    }
}