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    <p>Your problem is a layout problem. Add: </p> <pre><code>System.out.println(getSize()); </code></pre> <p>to your JComponent's paint method to see what happens when you resize the GUI.</p> <p>This is happening because the resize is invoking the layout manager actions. </p> <p>To solve this, don't use <code>setBounds(...)</code> to size components but rather the layout managers. Also override your JComponent's getPreferredSize method if you want the layout managers to respect a specific size for it. Finally, don't paint with the <code>paint</code> method but rather the <code>paintComponent</code> method. The tutorials will explain why.</p> <p>Also, if you absolutely need to position something using absolute positioning, then the container must use a null layout:</p> <pre><code> // The panel to which my SimpleCanvas objects are added paintArea = new JPanel(null); </code></pre> <p><strong>Edit</strong><br> If I were doing something like your program above, I'm not sure that I'd add new components to a JPanel but rather would simply have the drawing JPanel hold a list of Shapes and then have the shapes drawn in its paintComponent method using a for loop. For example:</p> <pre><code>import java.awt.BasicStroke; import java.awt.Color; import java.awt.Dimension; import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.RenderingHints; import java.awt.Shape; import java.awt.Stroke; import java.awt.event.MouseAdapter; import java.awt.event.MouseEvent; import java.awt.geom.Ellipse2D; import java.util.ArrayList; import java.util.List; import javax.swing.*; public class SimpleFrame2 extends JPanel { private static final Color ELLIPSE_COLOR = Color.LIGHT_GRAY; private static final Color ELLIPSE_FILL_COLOR = Color.blue; private static final int PREF_W = 600; private static final int PREF_H = 500; public static final int ELLIPSE_WIDTH = 100; public static final int ELLIPSE_HEIGHT = 50; private static final Stroke ELLIPSE_STROKE = new BasicStroke(2f); private List&lt;Shape&gt; shapes = new ArrayList&lt;Shape&gt;(); public SimpleFrame2() { addMouseListener(new MouseAdapter() { @Override public void mousePressed(MouseEvent mEvt) { double x = mEvt.getX() - ELLIPSE_WIDTH / 2; double y = mEvt.getY() - ELLIPSE_HEIGHT / 2; double w = ELLIPSE_WIDTH; double h = ELLIPSE_HEIGHT; shapes.add(new Ellipse2D.Double(x, y, w, h)); repaint(); } }); } @Override protected void paintComponent(Graphics g) { super.paintComponent(g); Graphics2D g2 = (Graphics2D) g; // to draw smooth edges g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON); g2.setStroke(ELLIPSE_STROKE); for (Shape shape : shapes) { g2.setColor(ELLIPSE_FILL_COLOR); g2.fill(shape); g2.setColor(ELLIPSE_COLOR); g2.draw(shape); } } @Override public Dimension getPreferredSize() { return new Dimension(PREF_W, PREF_H); } private static void createAndShowGui() { JFrame frame = new JFrame("SimpleFrame2"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.getContentPane().add(new SimpleFrame2()); frame.pack(); frame.setLocationRelativeTo(null); frame.setVisible(true); } public static void main(String[] args) { SwingUtilities.invokeLater(new Runnable() { public void run() { createAndShowGui(); } }); } } </code></pre> <p><strong>Edit 2</strong><br> with dragging of shapes</p> <pre><code>import java.awt.BasicStroke; import java.awt.Color; import java.awt.Dimension; import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.Point; import java.awt.Rectangle; import java.awt.RenderingHints; import java.awt.Stroke; import java.awt.event.*; import java.awt.geom.*; import java.util.ArrayList; import java.util.List; import javax.swing.*; @SuppressWarnings("serial") public class SimpleFrame3 extends JPanel { private static final Color ELLIPSE_COLOR = Color.LIGHT_GRAY; private static final Color ELLIPSE_FILL_COLOR = Color.blue; private static final int PREF_W = 600; private static final int PREF_H = 500; public static final int ELLIPSE_WIDTH = 100; public static final int ELLIPSE_HEIGHT = 50; private static final Stroke ELLIPSE_STROKE = new BasicStroke(2f); private List&lt;RectangularShape&gt; rects = new ArrayList&lt;RectangularShape&gt;(); public SimpleFrame3() { MyMouseAdapter myMouseAdapter = new MyMouseAdapter(); addMouseListener(myMouseAdapter); addMouseMotionListener(myMouseAdapter); } @Override protected void paintComponent(Graphics g) { super.paintComponent(g); Graphics2D g2 = (Graphics2D) g; // to draw smooth edges g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON); g2.setStroke(ELLIPSE_STROKE); for (RectangularShape rect : rects) { g2.setColor(ELLIPSE_FILL_COLOR); g2.fill(rect); g2.setColor(ELLIPSE_COLOR); g2.draw(rect); } } @Override public Dimension getPreferredSize() { return new Dimension(PREF_W, PREF_H); } class MyMouseAdapter extends MouseAdapter { private RectangularShape selectedRect = null; private Point deltaPt = null; @Override public void mousePressed(MouseEvent mEvt) { if (mEvt.getButton() != MouseEvent.BUTTON1) { return; } if (rects.size() &gt; 0) { for (int i = rects.size() - 1; i &gt;= 0; i--) { if (rects.get(i).contains(mEvt.getPoint())) { selectedRect = rects.get(i); rects.remove(selectedRect); rects.add(rects.size(), selectedRect); deltaPt = new Point(mEvt.getX() - selectedRect.getBounds().x, mEvt.getY() - selectedRect.getBounds().y); repaint(); return; } } } double x = mEvt.getX() - ELLIPSE_WIDTH / 2; double y = mEvt.getY() - ELLIPSE_HEIGHT / 2; double w = ELLIPSE_WIDTH; double h = ELLIPSE_HEIGHT; Ellipse2D ellipse = new Ellipse2D.Double(x, y, w, h); rects.add(ellipse); selectedRect = ellipse; deltaPt = new Point((int)(mEvt.getX() - x), (int)(mEvt.getY() - y)); repaint(); } @Override public void mouseDragged(MouseEvent e) { if (selectedRect != null) { Rectangle bounds = selectedRect.getBounds(); bounds.setLocation(e.getX() - deltaPt.x, e.getY() - deltaPt.y); selectedRect.setFrame(bounds.x, bounds.y, bounds.width, bounds.height); repaint(); } } @Override public void mouseReleased(MouseEvent e) { if (selectedRect != null) { repaint(); selectedRect = null; } } } private static void createAndShowGui() { JFrame frame = new JFrame("SimpleFrame3"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.getContentPane().add(new SimpleFrame3()); frame.pack(); frame.setLocationRelativeTo(null); frame.setVisible(true); } public static void main(String[] args) { SwingUtilities.invokeLater(new Runnable() { public void run() { createAndShowGui(); } }); } } </code></pre>
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    1. COThank you very much! I added the null parameter to jPanel's constructor, and all my problems were solved. I guess I'll have to learn how to use LayoutManagers now ;) Again, thanks.
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      1. USCharnia
    2. CO@Charnia: you're welcome. Please see addendum to my answer.
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    3. COThanks for the tip, I will definitely keep it in mind. The problem is I'm writing a program which also enables you to move the shapes by adding another mouseEventHandler to the custom Canvas class, so the method you suggested wouldn't work.
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