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POCreating a JApplet (swing based applet) with netbeans?
 

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  1. POCreating a JApplet (swing based applet) with netbeans?
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    <p>I am starting to learn Java a little after long time. And learning Netbeans 7.0.</p> <p>I just want to make sure I am doing this ok. </p> <p>I basically need to make an applet, but not having it AWT based, but instead Swing based. </p> <p>So I need to extend JApplet, not Applet. I understand in swing draws on a Jpanel instead of awt canvas (or Panel). And so I read on a web site that one needs to override PaintComponent() instead of overrriding paint() as the case with awt applet?</p> <p>I need to make a very simple applet, say with one button, when I click on it, I want to draw a graphics, say a line or circle, and have the output go to an area below the button.</p> <p>This is what I did </p> <ol> <li>File->New Project</li> <li>Select Java and from Projects, select "Java Application"</li> <li>make sure to Un-check the "create Main class", and click Finish</li> <li>File->New file</li> <li>Select "Swing GUI Forms" from under the catagories panel</li> <li>From the "File types", Select Japplet Form,Next and Finish</li> <li>From the palette, from Swing Controls, select Button and lay it on the from</li> <li>Now the tricky part. I need an area to draw on, right? So I from palette, I select, from Swing containers, a "Panel", and lay it on the form, resize it as needed. Do, now I have this:</li> </ol> <p><img src="https://i.stack.imgur.com/X0O3X.png" alt="enter image description here"></p> <p>Am I on the right track so far? Now I open the source file, and I see the init() method.</p> <p>Now is where I need little help. Not sure what the code I need to insert to just draw a line to the JPanel I just added. I know I need to insert it here:</p> <p><img src="https://i.stack.imgur.com/jN30h.png" alt="enter image description here"></p> <p>I tried the "insert Code" feature, and select override, but do not see PaintComponent()? </p> <p>I know how to do it in swt applet, just add a paint(Graphics g) method. But when I do this, the graphics do not draw inside the Jpanel area. Basically, how do I tell it to draw something to a specific JPanel area? </p> <p>If someone just tell me what code I need to insert there to draw a line or any graphics2D object to display on that JPanel I added below the bottom, that will great.</p> <p>thanks, --Nasser</p> <h2>EDIT 1:</h2> <p>Just a clarrification: If I add this function to paint on the Jpanel:</p> <p>public void paint(Graphics g)<br> {<br> super.paint(g);<br> g.drawString(....); } </p> <p>Then the output does show ok, but it over the main Japnel. And can hide the button and any other UI components are there.</p> <p>I need the paint output to go to a specific Jpanel which I added earlier below the button. To this one</p> <pre><code>private javax.swing.JPanel jPanel1; </code></pre> <p>So, my question is, how to draw/paint to the above object and not to the main Jpanel?</p> <h2>EDIT 2:</h2> <p>I tried just to change the JPanel background color, and it is not working. Here is the code. I also tried JpanelForm instead of JApplet Form. Can one use JFrame form to make an applet? Since that requires a main() it does not seem possible.</p> <pre><code>import javax.swing.*; import java.awt.*; import java.awt.Graphics; public class NewJApplet extends javax.swing.JApplet { /** Initializes the applet NewJApplet */ public void init() { jPanel1 = new JPanel(); try { java.awt.EventQueue.invokeAndWait(new Runnable() { public void run() { initComponents(); } }); } catch (Exception ex) { ex.printStackTrace(); } } private void initComponents() {...} //--------- ADDED THIS private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) { // TODO add your handling code here: Rectangle rect=new Rectangle(4,4); jPanel1.setBackground(Color.RED); } //--------------- // Variables declaration - do not modify private javax.swing.JButton jButton1; private javax.swing.JPanel jPanel1; // End of variables declaration } </code></pre>
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