How to respond to a mouse click on a Shape [closed]

Answer 1

In you solve a problem by dividing it to smaller problems.
First thing you would need is to identify a mouse click on a line.
One way to achieve it is to have a custom component like this one:

import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.geom.Line2D;
import java.awt.geom.Point2D;
import javax.swing.JComponent;

public class Line extends JComponent {

   private final Point2D start, end;

    public Line( Point2D start, Point2D end){
        this.start = start;
        this.end = end;
        addMouseListener(new MouseAdapter() {
            @Override
            public void mouseClicked(MouseEvent e) {
                System.out.println("mouse clicked");
            }
        });
    }

    @Override
    protected void paintComponent(Graphics g) {
        super.paintComponent(g);
        Graphics2D g2 = (Graphics2D) g;
        g2.setColor(Color.BLACK);
        g2.setStroke(new BasicStroke(2.0F));
        g2.draw(new Line2D.Double(start,end));
    }
}

Try to use it to draw a line on a JPanel.
Try to draw several lines and identify which was clicked.
After that try to move the clicked lines.