Draw Circles - JColorChooser, JSpinner Example - Java Swing - NetBeans - Internet & Web Programming Lab


Java Swing - JColorChooser, JSpinner Example
Draw Circles
NetBeans - Internet & Web Programming Lab
Source code:

/*
 * sw6.java
 *
 * Created on 2 Oct, 2011, 4:33:28 PM
 */

package swingexamples;

import java.awt.Color;
import java.awt.Graphics;
import javax.swing.JColorChooser;

/**
 *
 * @author gcecse
 */
public class sw6 extends javax.swing.JFrame {
    Color c;
    /** Creates new form sw6 */
    public sw6() {
        initComponents();
    }

    /** This method is called from within the constructor to
     * initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is
     * always regenerated by the Form Editor.
     */
    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">                          
    private void initComponents() {

        jSpinner1 = new javax.swing.JSpinner();
        jLabel1 = new javax.swing.JLabel();
        jLabel2 = new javax.swing.JLabel();
        jButton1 = new javax.swing.JButton();
        jLabel3 = new javax.swing.JLabel();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

        jSpinner1.setModel(new javax.swing.SpinnerNumberModel(50, 0, 100, 1));

        jLabel1.setText("Enter the radius and click below to draw circle");
        jLabel1.setFocusable(false);
        jLabel1.setHorizontalTextPosition(javax.swing.SwingConstants.LEADING);
        jLabel1.setRequestFocusEnabled(false);
        jLabel1.setVerticalTextPosition(javax.swing.SwingConstants.TOP);

        jLabel2.setBackground(new java.awt.Color(213, 230, 228));
        jLabel2.setForeground(new java.awt.Color(228, 4, 13));
        jLabel2.setHorizontalTextPosition(javax.swing.SwingConstants.CENTER);
        jLabel2.setOpaque(true);
        jLabel2.addMouseListener(new java.awt.event.MouseAdapter() {
            public void mouseClicked(java.awt.event.MouseEvent evt) {
                jLabel2MouseClicked(evt);
            }
        });

        jButton1.setMnemonic('f');
        jButton1.setText("Select a colour");
        jButton1.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton1ActionPerformed(evt);
            }
        });

        jLabel3.setOpaque(true);

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap()
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addGroup(layout.createSequentialGroup()
                        .addComponent(jLabel1)
                        .addGap(18, 18, 18)
                        .addComponent(jSpinner1, javax.swing.GroupLayout.PREFERRED_SIZE, 115, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addGap(18, 18, 18)
                        .addComponent(jButton1, javax.swing.GroupLayout.PREFERRED_SIZE, 120, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                        .addComponent(jLabel3, javax.swing.GroupLayout.DEFAULT_SIZE, 67, Short.MAX_VALUE)
                        .addContainerGap(45, Short.MAX_VALUE))
                    .addGroup(layout.createSequentialGroup()
                        .addComponent(jLabel2, javax.swing.GroupLayout.PREFERRED_SIZE, 639, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addContainerGap(45, Short.MAX_VALUE))))
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addGap(25, 25, 25)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addComponent(jLabel1, javax.swing.GroupLayout.PREFERRED_SIZE, 40, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                        .addComponent(jSpinner1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addComponent(jButton1)
                        .addComponent(jLabel3, javax.swing.GroupLayout.PREFERRED_SIZE, 27, javax.swing.GroupLayout.PREFERRED_SIZE)))
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 42, Short.MAX_VALUE)
                .addComponent(jLabel2, javax.swing.GroupLayout.PREFERRED_SIZE, 374, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addContainerGap())
        );

        pack();
    }// </editor-fold>                        

    private void jLabel2MouseClicked(java.awt.event.MouseEvent evt) {                                     
        // TODO add your handling code here:
        int r=((Integer)jSpinner1.getValue()).intValue();
        Graphics g=jLabel2.getGraphics();
        g.setColor(c);
        g.fillOval(evt.getX(),evt.getY(), 2*r, 2*r);
    }                                    

    private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {                                         
        // TODO add your handling code here:
        c=JColorChooser.showDialog(this, "Please select a colour", null);
       // jLabel3.setBackground(c);
    }                                        

    /**
    * @param args the command line arguments
    */
    public static void main(String args[]) {
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new sw6().setVisible(true);
            }
        });
    }

    // Variables declaration - do not modify                     
    private javax.swing.JButton jButton1;
    private javax.swing.JLabel jLabel1;
    private javax.swing.JLabel jLabel2;
    private javax.swing.JLabel jLabel3;
    private javax.swing.JSpinner jSpinner1;
    // End of variables declaration                   

}

Output:

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