Myujth

I currently have 2 JPanels being added to a JFrame. Upon resizing the window, only the most recently added JPanel gets resized. How can I ensure that all JPanels resize? In my program, I launch a firework and have gridlines. I want each to hug the bottom of the screen.

With this code, the launched firework resizes to hug, but the grid lines dont:

JFrame frame = new JFrame();
frame.setSize(950,800);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

GuiTest test = new GuiTest();
frame.add(test, BorderLayout.PAGE_END);
frame.setVisible(true);

Grid grid = new Grid();
frame.add(grid);
frame.setVisible(true);

FireworkP canvas = new FireworkP(150, 45, 7, 2);
frame.add(canvas);
frame.setVisible(true);
frame.getContentPane().setBackground(Color.BLACK);
frame.setVisible(true);

With this code, the opposite occurs:

JFrame frame = new JFrame();
frame.setSize(950,800);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

GuiTest test = new GuiTest();
frame.add(test, BorderLayout.PAGE_END);
frame.setVisible(true);

FireworkP canvas = new FireworkP(150, 45, 7, 2);
frame.add(canvas);
frame.setVisible(true);
frame.getContentPane().setBackground(Color.BLACK);
frame.setVisible(true);

Grid grid = new Grid();
frame.add(grid);
frame.setVisible(true);

Default state: https://i.imgur.com/cpzpBha.png

Code 1 resized: https://i.imgur.com/SRdh2oA.png

Code 2 resized: https://i.imgur.com/VHY4Ff1.png

So is there any way to have a separate grid line class or should I just combine them?

You build a parent / child relationship.

So you logic would be something like:

FireworkP foreground = new FireworkP(150, 45, 7, 2);
foreground.setOpaque( false );

Grid background = new Grid();
background.add(foreground);

frame.add(background);
frame.setVisible(true);

The above assumes:

1. your FireworkP and Grid classes are JPanels where you do custom painting.


2. your classes use an appropriate layout manager

So now you GUI has a structure like:

- frame
 - background
 - foreground

So you have components that can paint themselves on top of one another on the Z axis.

If you add more than one component to the same panel then the components are painted on the X/Y axis