Formulario de login personalizado

import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Cursor;
import java.awt.Dimension;
import java.awt.GradientPaint;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.RenderingHints;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.geom.GeneralPath;
import java.awt.geom.Point2D;
import java.util.ArrayList;
import javax.swing.JComponent;
/**
 * Boton de forma hexagonal
 * see https://www.jc-mouse.net/
 * @author MOUSE
 */
public class HexagonButton extends JComponent implements MouseListener {

    private Image avatar;
    private ArrayList<Point2D.Float> vertices = new ArrayList();
    private Signboard signboard;
    private boolean entered = false;
    private String nickName;
    
    /**
     * constructor de clase
     */
    public HexagonButton(){
        super();        
        vertices = CalculateVertices(50,0,100);
        HexagonButton.this.setCursor(new Cursor(Cursor.HAND_CURSOR));
        HexagonButton.this.setSize(new Dimension((int) vertices.get(2).x, (int) vertices.get(3).y));        
        HexagonButton.this.setOpaque(false);                
        HexagonButton.this.addMouseListener(HexagonButton.this);
    }
    
    /**
     * Calcula vertices del hexagono
     *       A        B
     * 
     * 
     * F                    C
     * 
     * 
     *      E          D
     * @param x coordenada eje x
     * @param y coordenada eje y
     * @param side tamaño de lado del hexagono
     * @return ArrayList con los puntos que forman el hexagono
     */
    private ArrayList<Point2D.Float> CalculateVertices(float x, float y,float side)
    {
        ArrayList<Point2D.Float> array = new ArrayList();        
        float h;
        float r;            
        h = (float)(Math.sin( Math.toRadians(30)) * side);
        r = (float)(Math.cos(Math.toRadians(30)) * side);
        //vertices
        array.add( new Point2D.Float(x, y) );               //A
        array.add( new Point2D.Float(x + side, y) );        //B
        array.add( new Point2D.Float(x + side + h, y + r) );//C
        array.add( new Point2D.Float(x + side, y + r + r) );//D
        array.add( new Point2D.Float(x, y + r + r) );       //E
        array.add( new Point2D.Float(x - h, y + r ) );      //F 
        return array;
    }
  
    
    @Override
    public void paintComponent(Graphics g){
        super.paintComponent(g);
        Graphics2D g2 = (Graphics2D)g;
        g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,RenderingHints.VALUE_ANTIALIAS_ON);          
        //puntos principales del hexagono
        GeneralPath polygonPrincipal = new GeneralPath(GeneralPath.WIND_EVEN_ODD,6);                 
        polygonPrincipal.moveTo(vertices.get(0).x, vertices.get(0).y); 
        polygonPrincipal.lineTo(vertices.get(1).x, vertices.get(1).y);             
        polygonPrincipal.lineTo(vertices.get(2).x, vertices.get(2).y);             
        polygonPrincipal.lineTo(vertices.get(3).x, vertices.get(3).y);             
        polygonPrincipal.lineTo(vertices.get(4).x, vertices.get(4).y);             
        polygonPrincipal.lineTo(vertices.get(5).x, vertices.get(5).y);             
        polygonPrincipal.closePath();
        //coordenadas para el borde   
        GeneralPath polygonPrincipal2 = new GeneralPath(GeneralPath.WIND_EVEN_ODD,6);                 
        polygonPrincipal2.moveTo(vertices.get(0).x+1, vertices.get(0).y+1); 
        polygonPrincipal2.lineTo(vertices.get(1).x-2, vertices.get(1).y+1);             
        polygonPrincipal2.lineTo(vertices.get(2).x-2, vertices.get(2).y);             
        polygonPrincipal2.lineTo(vertices.get(3).x-2, vertices.get(3).y-1);             
        polygonPrincipal2.lineTo(vertices.get(4).x+2, vertices.get(4).y-1);             
        polygonPrincipal2.lineTo(vertices.get(5).x+1, vertices.get(5).y);             
        polygonPrincipal2.closePath();
        
        if(entered)
            g2.setPaint(new GradientPaint(0, 0, new Color(214,214,214), 460, 0, new Color(255,255,255)));
        else
            g2.setPaint(new GradientPaint(0, 0, new Color(255,255,255), 460, 0, new Color(214,214,214)));
        g2.fill( polygonPrincipal );
        
        g2.setColor(  new Color(55,55,55) );        
        g2.setStroke( new BasicStroke( 4 ));
        g2.draw( polygonPrincipal2 );
        
        if(avatar!=null)
            g2.drawImage(avatar,53, 28,null);
        if(signboard!=null)
            signboard.draw(g2);
    }

    public String getNickName() {
        return nickName;
    }

    public void setNickName(String nickName) {
        this.nickName = nickName;
        signboard = new Signboard(nickName,53,126);
    }

    public Image getAvatar() {
        return avatar;
    }

    public void setAvatar(Image avatar) {
        this.avatar = avatar;
    }     
    
    @Override
    public void mouseClicked(MouseEvent e) {/*Aquí no hay nada que ver, circulen*/}

    @Override
    public void mousePressed(MouseEvent e) {/*Aquí no hay nada que ver, circulen*/}

    @Override
    public void mouseReleased(MouseEvent e) {/*Aquí no hay nada que ver, circulen*/}

    @Override
    public void mouseEntered(MouseEvent e) {
        entered=true;
        repaint();
    }

    @Override
    public void mouseExited(MouseEvent e) {
        entered=false;
        repaint();
    }
    
}