DrawLine.java

package utils;

import java.awt.BasicStroke;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.geom.Line2D;

import javax.swing.JComponent;

public class DrawLine extends JComponent {
    private int x1;
    private int x2;
    private int y1;
    private int y2;
    private int width;

    public DrawLine(int x1, int y1, int x2, int y2, int width) {
        this.x1 = x1;
        this.y1 = y1;
        this.x2 = x2;
        this.y2 = y2;
        this.width = width;
    }

    @Override
    protected void paintComponent(Graphics graphics) {
        super.paintComponent(graphics);

        Graphics2D graphics2d = (Graphics2D) graphics;
        graphics2d.setStroke(new BasicStroke(this.width));
        graphics2d.draw(new Line2D.Float(this.x1, this.y1, this.x2, this.y2));
    }
}