Java JPanel Paint Scaling

Question

Following code work for visualizing a molecule on a JPanel except it does not rescale when I change the size of JPanel at runtime. The Chemistry Development Kit is used for generating rendered Image. A molecule is passed to MoleculeViewer for visualizing. What am I doing wrong??

Answer 1

What am I doing wrong??

• why you needed to setSize(new java.awt.Dimension(400, 400));

• put your image = new BufferedImage(this.WIDTH, this.HEIGHT, BufferedImage.TYPE_INT_RGB); as Icon to the JLabel , then you can remove anything about paintComponent()

• then you can return JLabel instead of JPanel , but JLabel is translucent by default, or put JLabel to the JPanel by using proper LayoutManager in this case BorderLayout.CENTER

• you have to check how way you added MoleculeViewer , what LayoutManager is there used???, because only usage of LayoutManager can this job correctly to resize (or not resize) Container's childs with Top-Level Container ,

• MoleculeViewer must retuns PreferredSize for its parent

Answer 2

Adding following resolved the not redrawing upon scaling problem 

renderer.paint(molecule_, new AWTDrawVisitor(g2), new Rectangle2D.Double(0, 0, w, h), false);
            g2.dispose();
            }
            else