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POHow use ActionListener in JRadioButtons
 

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    <p>I want to do a very simply "Paint" in Java. Now i have troubles because i dont know how to use the actionListener in the JRaddioButtons to change the colors of the line that i want to draw.</p> <p>I show my code, sorry if is too large:</p> <pre><code>import java.awt.Color; import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.Point; import java.awt.Shape; import java.awt.event.MouseAdapter; import java.awt.event.MouseEvent; import java.awt.event.MouseMotionAdapter; import java.awt.geom.Line2D; import java.util.ArrayList; import javax.swing.JComponent; import javax.swing.JFrame; import java.awt.*; import java.awt.event.*; import javax.swing.JMenu; import javax.swing.JMenuItem; import javax.swing.JRadioButtonMenuItem; import javax.swing.ButtonGroup; import javax.swing.JMenuBar; import javax.swing.KeyStroke; import java.awt.event.*; import javax.swing.*; import javax.swing.event.*; import javax.swing.JPanel; import javax.swing.JFrame; public class Dibujar extends JComponent { private Point inicioArrastre; private Point finArrastre; private ArrayList&lt;Shape&gt; lineas = new ArrayList&lt;Shape&gt;(); public Dibujar() { super(); addMouseListener(new MouseAdapter() { public void mousePressed(MouseEvent e) { // cuando se presiona el mouse inicioArrastre = new Point(e.getX(), e.getY()); repaint(); } public void mouseReleased(MouseEvent e) { // cuando se deja de presionar el mouse finArrastre = new Point(e.getX(), e.getY()); Shape linea = crearLinea(inicioArrastre.x, inicioArrastre.y, finArrastre.x, finArrastre.y); lineas.add(linea); repaint(); } }); addMouseMotionListener(new MouseMotionAdapter() { public void mouseDragged(MouseEvent e) { // cuando se esta arrastrando el mouse finArrastre = new Point(e.getX(), e.getY()); Shape linea = crearLinea(inicioArrastre.x, inicioArrastre.y, finArrastre.x, finArrastre.y); lineas.add(linea); inicioArrastre = new Point(finArrastre.x, finArrastre.y); repaint(); } }); } public void paint(Graphics g) { Graphics2D g2 = (Graphics2D) g; g2.setColor(Color.RED); for (Shape linea : lineas) { // dibuja todos las elipses g2.draw(linea); } } private Line2D.Float crearLinea(int x1, int y1, int x2, int y2) { return new Line2D.Float(x1, y1, x2, y2); } public static void main(String[] a3d) { Dibujar dibu = new Dibujar(); JFrame ventana = new JFrame("Dibujar"); ventana.setJMenuBar(dibu.createMenuBar()); ventana.setSize(400, 300); ventana.setLocationRelativeTo(null); ventana.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); ventana.add(new Dibujar()); ventana.setVisible(true); } public JMenuBar createMenuBar() { JMenuBar menuBar; JMenu menu, submenu; JMenuItem menuItem; JRadioButtonMenuItem rbMenuItem; //Create the menu bar. menuBar = new JMenuBar(); //Build the first menu. menu = new JMenu("A Menu"); menu.setMnemonic(KeyEvent.VK_A); menu.getAccessibleContext().setAccessibleDescription( "The only menu in this program that has menu items"); menuBar.add(menu); //a group of JMenuItems menuItem = new JMenuItem("Select a Color", KeyEvent.VK_T); //menuItem.setMnemonic(KeyEvent.VK_T); //used constructor instead menuItem.setAccelerator(KeyStroke.getKeyStroke( KeyEvent.VK_1, ActionEvent.ALT_MASK)); menuItem.getAccessibleContext().setAccessibleDescription( "This doesn't really do anything"); menu.add(menuItem); menuItem.setMnemonic(KeyEvent.VK_B); menu.add(menuItem); menuItem.setMnemonic(KeyEvent.VK_D); menu.add(menuItem); //a group of radio button menu items menu.addSeparator(); ButtonGroup group = new ButtonGroup(); rbMenuItem = new JRadioButtonMenuItem("RED"); rbMenuItem.setSelected(true); rbMenuItem.setMnemonic(KeyEvent.VK_R); rbMenuItem.addActionListener(null); group.add(rbMenuItem); menu.add(rbMenuItem); rbMenuItem = new JRadioButtonMenuItem("BLUE"); rbMenuItem.setMnemonic(KeyEvent.VK_B); group.add(rbMenuItem); menu.add(rbMenuItem); return menuBar; } } </code></pre> <p>Thanks you so much!</p>
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