How can I change the shape of a JTabbedPane tab?

by

correct way is only to change Look and Feel, nice example from Old.Java.Forums.Sun

enter image description here

import java.awt.BorderLayout;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTabbedPane;
import javax.swing.JTextArea;

public class TabbedPane extends JPanel {

    private static final long serialVersionUID = 1L;

    public TabbedPane() {
        setLayout(new BorderLayout());
        JPanel jp = new JPanel();
        jp.setLayout(new BorderLayout());
        JTabbedPane tb = new JTabbedPane();
        tb.setUI(new CustomTabbedPaneUI());
        tb.add("Tab1", new JTextArea(""));
        tb.add("Tab2", new JTextArea(""));
        tb.add("Tab3", new JTextArea(""));
        tb.add("Tab4", new JTextArea(""));
        tb.add("Tab5", new JTextArea(""));
        jp.add(tb, BorderLayout.CENTER);
        add(jp, BorderLayout.CENTER);
        tb.setEnabledAt(1, false);
        tb.setEnabledAt(3, false);
    }

    public static void main(String[] args) {
        JFrame frame = new JFrame();
        frame.getContentPane().add(new TabbedPane());
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setSize(500, 200);
        frame.setVisible(true);
    }
}

and

import java.util.*;
import java.awt.*;
import javax.swing.*;
import javax.swing.plaf.*;
import javax.swing.plaf.basic.*;
import javax.swing.text.View;

public class CustomTabbedPaneUI extends BasicTabbedPaneUI {

    private Color selectColor;
    private Color deSelectColor;
    private int inclTab = 4;
    private int anchoFocoV = inclTab;
    private int anchoFocoH = 4;
    private int anchoCarpetas = 18;
    private Polygon shape;

    public static ComponentUI createUI(JComponent c) {
        return new CustomTabbedPaneUI();
    }

    @Override
    protected void installDefaults() {
        super.installDefaults();
        selectColor = new Color(250, 192, 192);
        deSelectColor = new Color(197, 193, 168);
        tabAreaInsets.right = anchoCarpetas;
    }

    @Override
    protected void paintTabArea(Graphics g, int tabPlacement, int selectedIndex) {
        if (runCount > 1) {
            int lines[] = new int[runCount];
            for (int i = 0; i < runCount; i++) {
                lines[i] = rects[tabRuns[i]].y + (tabPlacement == TOP ? maxTabHeight : 0);
            }
            Arrays.sort(lines);
            if (tabPlacement == TOP) {
                int fila = runCount;
                for (int i = 0; i < lines.length - 1; i++, fila--) {
                    Polygon carp = new Polygon();
                    carp.addPoint(0, lines[i]);
                    carp.addPoint(tabPane.getWidth() - 2 * fila - 2, lines[i]);
                    carp.addPoint(tabPane.getWidth() - 2 * fila, lines[i] + 3);
                    if (i < lines.length - 2) {
                        carp.addPoint(tabPane.getWidth() - 2 * fila, lines[i + 1]);
                        carp.addPoint(0, lines[i + 1]);
                    } else {
                        carp.addPoint(tabPane.getWidth() - 2 * fila, lines[i] + rects[selectedIndex].height);
                        carp.addPoint(0, lines[i] + rects[selectedIndex].height);
                    }
                    carp.addPoint(0, lines[i]);
                    g.setColor(hazAlfa(fila));
                    g.fillPolygon(carp);
                    g.setColor(darkShadow.darker());
                    g.drawPolygon(carp);
                }
            } else {
                int fila = 0;
                for (int i = 0; i < lines.length - 1; i++, fila++) {
                    Polygon carp = new Polygon();
                    carp.addPoint(0, lines[i]);
                    carp.addPoint(tabPane.getWidth() - 2 * fila - 1, lines[i]);
                    carp.addPoint(tabPane.getWidth() - 2 * fila - 1, lines[i + 1] - 3);
                    carp.addPoint(tabPane.getWidth() - 2 * fila - 3, lines[i + 1]);
                    carp.addPoint(0, lines[i + 1]);
                    carp.addPoint(0, lines[i]);
                    g.setColor(hazAlfa(fila + 2));
                    g.fillPolygon(carp);
                    g.setColor(darkShadow.darker());
                    g.drawPolygon(carp);
                }
            }
        }
        super.paintTabArea(g, tabPlacement, selectedIndex);
    }

    @Override
    protected void paintTabBackground(Graphics g, int tabPlacement, int tabIndex, int x, int y, int w, int h, boolean isSelected) {
        Graphics2D g2D = (Graphics2D) g;
        GradientPaint gradientShadow;
        int xp[] = null; // Para la forma
        int yp[] = null;
        switch (tabPlacement) {
            case LEFT:
                xp = new int[]{x, x, x + w, x + w, x};
                yp = new int[]{y, y + h - 3, y + h - 3, y, y};
                gradientShadow = new GradientPaint(x, y, new Color(100, 100, 255), x, y + h, Color.ORANGE);
                break;
            case RIGHT:
                xp = new int[]{x, x, x + w - 2, x + w - 2, x};
                yp = new int[]{y, y + h - 3, y + h - 3, y, y};
                gradientShadow = new GradientPaint(x, y, new Color(100, 100, 255), x, y + h, new Color(153, 186, 243));
                break;
            case BOTTOM:
                xp = new int[]{x, x, x + 3, x + w - inclTab - 6, x + w - inclTab - 2, x + w - inclTab, x + w - 3, x};
                yp = new int[]{y, y + h - 3, y + h, y + h, y + h - 1, y + h - 3, y, y};
                gradientShadow = new GradientPaint(x, y, new Color(100, 100, 255), x, y + h, Color.BLUE);
                break;
            case TOP:
            default:
                xp = new int[]{x, x, x + 3, x + w - inclTab - 6, x + w - inclTab - 2, x + w - inclTab, x + w - inclTab, x};
                yp = new int[]{y + h, y + 3, y, y, y + 1, y + 3, y + h, y + h};
                gradientShadow = new GradientPaint(0, 0, Color.ORANGE, 0, y + h / 2, new Color(240, 255, 210));
                break;
        }
        // ;
        shape = new Polygon(xp, yp, xp.length);
        if (isSelected) {
            g2D.setColor(selectColor);
            g2D.setPaint(gradientShadow);
        } else {
            if (tabPane.isEnabled() && tabPane.isEnabledAt(tabIndex)) {
                g2D.setColor(deSelectColor);
                GradientPaint gradientShadowTmp = new GradientPaint(0, 0, new Color(255, 255, 200), 0, y + h / 2, new Color(240, 255, 210));
                g2D.setPaint(gradientShadowTmp);
            } else {
                GradientPaint gradientShadowTmp = new GradientPaint(0, 0, new Color(240, 255, 210), 0, y + 15 + h / 2, new Color(204, 204, 204));
                g2D.setPaint(gradientShadowTmp);
            }
        }
        //selectColor = new Color(255, 255, 200);
        //deSelectColor = new Color(240, 255, 210);
        g2D.fill(shape);
        if (runCount > 1) {
            g2D.setColor(hazAlfa(getRunForTab(tabPane.getTabCount(), tabIndex) - 1));
            g2D.fill(shape);
        }
        g2D.fill(shape);
    }

    @Override
    protected void paintText(Graphics g, int tabPlacement, Font font, FontMetrics metrics, int tabIndex, String title, Rectangle textRect, boolean isSelected) {
        super.paintText(g, tabPlacement, font, metrics, tabIndex, title, textRect, isSelected);
        g.setFont(font);
        View v = getTextViewForTab(tabIndex);
        if (v != null) {
            // html
            v.paint(g, textRect);
        } else {
            // plain text
            int mnemIndex = tabPane.getDisplayedMnemonicIndexAt(tabIndex);
            if (tabPane.isEnabled() && tabPane.isEnabledAt(tabIndex)) {
                g.setColor(tabPane.getForegroundAt(tabIndex));
                BasicGraphicsUtils.drawStringUnderlineCharAt(g, title, mnemIndex, textRect.x, textRect.y + metrics.getAscent());
            } else { // tab disabled
                g.setColor(Color.BLACK);
                BasicGraphicsUtils.drawStringUnderlineCharAt(g, title, mnemIndex, textRect.x, textRect.y + metrics.getAscent());
                g.setColor(tabPane.getBackgroundAt(tabIndex).darker());
                BasicGraphicsUtils.drawStringUnderlineCharAt(g, title, mnemIndex, textRect.x - 1, textRect.y + metrics.getAscent() - 1);
            }
        }
    }
    /*protected void paintText(Graphics g, int tabPlacement, Font font, FontMetrics metrics, int tabIndex, String title, Rectangle textRect, boolean isSelected) {
    g.setFont(font);
    View v = getTextViewForTab(tabIndex);
    if (v != null) {
    // html
    v.paint(g, textRect);
    } else {
    // plain text
    int mnemIndex = tabPane.getDisplayedMnemonicIndexAt(tabIndex);

    if (tabPane.isEnabled() && tabPane.isEnabledAt(tabIndex)) {
    Color fg = tabPane.getForegroundAt(tabIndex);
    if (isSelected && (fg instanceof UIResource)) {
    Color selectedFG = UIManager.getColor("TabbedPane.selectedForeground");
    if (selectedFG != null) {
    fg = selectedFG;
    }
    }
    g.setColor(fg);
    SwingUtilities2.drawStringUnderlineCharAt(tabPane, g, title, mnemIndex, textRect.x, textRect.y + metrics.getAscent());

    } else { // tab disabled
    //PAY ATTENTION TO HERE
    g.setColor(tabPane.getBackgroundAt(tabIndex).brighter());
    SwingUtilities2.drawStringUnderlineCharAt(tabPane, g, title, mnemIndex, textRect.x, textRect.y + metrics.getAscent());
    g.setColor(tabPane.getBackgroundAt(tabIndex).darker());
    SwingUtilities2.drawStringUnderlineCharAt(tabPane, g, title, mnemIndex,
    textRect.x - 1, textRect.y + metrics.getAscent() - 1);
    }
    }
    }*/

    @Override
    protected int calculateTabWidth(int tabPlacement, int tabIndex, FontMetrics metrics) {
        return 20 + inclTab + super.calculateTabWidth(tabPlacement, tabIndex, metrics);
    }

    @Override
    protected int calculateTabHeight(int tabPlacement, int tabIndex, int fontHeight) {
        if (tabPlacement == LEFT || tabPlacement == RIGHT) {
            return super.calculateTabHeight(tabPlacement, tabIndex, fontHeight);
        } else {
            return anchoFocoH + super.calculateTabHeight(tabPlacement, tabIndex, fontHeight);
        }
    }

    @Override
    protected void paintTabBorder(Graphics g, int tabPlacement, int tabIndex, int x, int y, int w, int h, boolean isSelected) {
    }

    @Override
    protected void paintFocusIndicator(Graphics g, int tabPlacement, Rectangle[] rects, int tabIndex, Rectangle iconRect, Rectangle textRect, boolean isSelected) {
        if (tabPane.hasFocus() && isSelected) {
            g.setColor(UIManager.getColor("ScrollBar.thumbShadow"));
            g.drawPolygon(shape);
        }
    }

    protected Color hazAlfa(int fila) {
        int alfa = 0;
        if (fila >= 0) {
            alfa = 50 + (fila > 7 ? 70 : 10 * fila);
        }
        return new Color(0, 0, 0, alfa);
    }
}

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