I have a JPanel to which I’d like to add JPEG and PNG images that I generate on the fly. All the examples I’ve seen so far in the Swing Tutorials, specially in the Swing examples use ImageIcons. I’m generating these images as byte arrays, and they are usually larger than the common icon they … Read more
How do I draw a triangle?
Usage depends on whether the component’s parent has a layout manager or not. setSize() — use when a parent layout manager does not exist; setPreferredSize() (also its related setMinimumSize and setMaximumSize) — use when a parent layout manager exists. The setSize() method probably won’t do anything if the component’s parent is using a layout manager; the places this will typically have an … Read more
Here’s how I do it (with a little more info on how to load an image): import java.awt.Graphics; import java.awt.image.BufferedImage; import java.io.File; import java.io.IOException; import java.util.logging.Level; import java.util.logging.Logger; import javax.imageio.ImageIO; import javax.swing.JPanel; public class ImagePanel extends JPanel{ private BufferedImage image; public ImagePanel() { try { image = ImageIO.read(new File(“image name and path”)); } catch (IOException … Read more
How to repaint a JPanel after have drawn on it?
JPanel doesn’t have ActionListener capabilities. Instead, you need to use a MouseListener import java.awt.Color; import java.awt.Container; import java.awt.Dimension; import java.awt.EventQueue; import java.awt.GridLayout; import java.awt.event.MouseAdapter; import java.awt.event.MouseEvent; import javax.swing.JFrame; import javax.swing.JPanel; public class CoordBoutons extends JFrame { CoordBoutons() { super(“GridLayout”); setDefaultCloseOperation(EXIT_ON_CLOSE); Container contenant = getContentPane(); contenant.setLayout(new GridLayout(8, 8)); for (int i = 0; i < 8; i++) { for (int … Read more
