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POResizing added painted components and strange swing behaviors
 

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    <p>I have this problem bothering me for days. I'm making a special paint program. I made a JPanel, and added custom jComponents which are painted using the paint(..) method. The problem is, whenever I resize the window, all the added components "disappear" (or just don't paint) so I end up with a empty frame.</p> <p>Also i noticed some strange behaviors of swing when using this method. I have added comments to the code describing this problem.</p> <pre><code>package simple; import java.awt.*; import java.awt.event.*; import java.util.ArrayList; import javax.swing.*; public class SimpleFrame extends JFrame { JPanel paintArea; SimpleCanvas c1; SimpleCanvas c2; ArrayList&lt;SimpleCanvas&gt; list; public static void main(String[] args) { SimpleFrame frame = new SimpleFrame(); } public SimpleFrame() { super("Test"); setSize(600,500); setDefaultCloseOperation(EXIT_ON_CLOSE); //The panel to which my SimpleCanvas objects are added paintArea = new JPanel(); paintArea.setPreferredSize(new Dimension(600, 500)); paintArea.addMouseListener(new paintAreaMouseEvents()); getContentPane().add(paintArea, BorderLayout.CENTER); setVisible(true); paintArea.setVisible(true); //A list to hold all the objects together list = new ArrayList&lt;SimpleCanvas&gt;(10); //The same as in class paintAreaMouseEvent, but doesnt work SimpleCanvas c = new SimpleCanvas(); c.setBounds(60, 100, 100, 50); list.add(c); paintArea.add(list.get(list.size() - 1)); paintArea.repaint(); } //When you click the mouse, it makes an oval class paintAreaMouseEvents extends MouseAdapter { @Override //This does work. public void mouseClicked (MouseEvent me) { SimpleCanvas c = new SimpleCanvas(); c.setBounds(me.getX() - 50, me.getY() - 25, 100, 50); list.add(c); paintArea.add(list.get(list.size() - 1)); paintArea.repaint(); } } } </code></pre> <p>And here is the SimpleCanvas class</p> <pre><code>package simple; import java.awt.*; import javax.swing.JComponent; public class SimpleCanvas extends JComponent { public void paint(Graphics g) { super.paint(g); g.setColor(Color.BLUE); g.fillOval(0, 0, 100, 50); } } </code></pre> <p>Thanks :)</p> <p>BTW: Just wanted to say this site is amazing. I came here a lot while using Google, and now I finally decided to make an account.</p>
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