The Container returned by getContentPane() is, by default, the contentPane of a JRootPane managed by the top-level container, JFrame. Although, “as a convenience, the add method and its variants, remove and setLayout have been overridden to forward to the contentPane as necessary,” there’s no a priori way to know about the frame’s internal use of … Read more
However, I struggle with arrays and I am sure that I am not doing it correctly. I wouldn’t use Arrays. Instead, have a Ball object manage its own state. Then you can have different color, speed, size etc for each Ball. Then when the Timer fires you just calculate the new position and repaint the … Read more
he slides a panel (with his content) to the left so the panel on the right replaces it with a smooth effect You question mentions you want the panel to “slide”, but the code looks like you are trying to get the panel to “shrink”, so it is replaced by another panel. Assuming you have … Read more
Have a look through this source which behaves in a more predictable manner, and also includes a nice tweak to the chopper image (animated). 😉 import java.awt.*; import java.awt.event.*; import java.awt.geom.*; import java.awt.image.BufferedImage; import java.net.URL; import java.io.IOException; import javax.imageio.ImageIO; import javax.swing.*; public class MainFrame { public MainFrame() { JFrame f = new JFrame(“Helicopter Background Test”); … Read more
The panel needs to be laid out based on it’s requirements. If the panel hasn’t being realized on the screen yet, it may not render the way you expect it do The following example assumes that the panel has not being displayed on the screen… setSize(getPreferredSize()); BufferedImage image = new BufferedImage(getWidth(), getHeight(), BufferedImage.TYPE_INT_RGB); Graphics2D g … Read more
I think LayeredPane is your best bet here. You would need a third panel though to contain A and B. This third panel would be the layeredPane and then panel A and B could still have a nice LayoutManagers. All you would have to do is center B over A and there is quite a … Read more
This is based on this example and makes use of JXLayer to physically rotate the label component the way you want it. It also saves you from having to do any custom painting of your own. I’ve used a similar technique to rotate JTabbedPane tabs so they run vertically down the side of the JTabbedPane … Read more
Here are a few suggestions: Use a GridLayout for the top panel; in this case, zero means the number of rows is determined by the specified number of columns and the total number of components in the layout: JPanel north = new JPanel(new GridLayout(0, 9)); Here’s an outline of how you can make your center … Read more
Use a CardLayout, as shown here.
This is not an immediate answer to your question, but knowing (or at least suspecting) what it is that you wish to offer (a simple paint program), I suggest starting with this approach based around a BufferedImage as the painting surface.. import java.awt.*; import java.awt.RenderingHints.Key; import java.awt.event.*; import java.awt.image.BufferedImage; import java.io.File; import java.io.IOException; import java.util.HashMap; … Read more