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How to draw an image over another image?

I have a Java project dedicated to simulating a network of traffic in a random city, I was able to figure out a way to implement this project, so I divided each intersection into a section, which is basically an extended JPanel class (called Carrefour) ... everything works fine so far I'm not stuck with how to draw vehicles and lay them on the roads.

So my problem is how to draw an image (vehicle image) over another image (expensive)?

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2 answers

If it is Swing, then draw a background image in BufferedImage. Display this BufferedImage in the JComponent's paintComponent method (e.g., JPanel) using the Graphic method drawImage(...), and then draw the changing images using this paintComponent method. Remember to call the method first super.paintComponent(...).

Please note that this question is asked quite a bit here and elsewhere, and, as you would expect, there are many examples of these kinds of things that you can find here with a little search.

Edit
You ask:

Thank you, this is how I draw a firt image (road)

Again, you will create a BufferedImage for this, probably using ImageIO.read(...). Then you will draw this in your JPanel method paintComponent(Graphics g)with g.drawImage(...).

For instance...

import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.image.*;
import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;

import javax.imageio.ImageIO;
import javax.swing.*;

@SuppressWarnings("serial")
public class IntersectionImagePanel extends JPanel {
   private static final String INTERSECTION_LINK = "http://www.weinerlawoffice.com/" +
        "accident-diagram.jpg";
   private BufferedImage intersectionImage;

   public IntersectionImagePanel() {
      URL imageUrl;
      try {
         imageUrl = new URL(INTERSECTION_LINK);
         intersectionImage = ImageIO.read(imageUrl );
      } catch (MalformedURLException e) {
         e.printStackTrace();
         System.exit(-1);
      } catch (IOException e) {
         e.printStackTrace();
         System.exit(-1);
      }
   }

   @Override
   protected void paintComponent(Graphics g) {
      super.paintComponent(g);
      if (intersectionImage != null) {
         g.drawImage(intersectionImage, 0, 0, this);
      }
   }

   @Override
   public Dimension getPreferredSize() {
      if (intersectionImage != null) {
         int width = intersectionImage.getWidth();
         int height = intersectionImage.getHeight();
         return new Dimension(width , height );
      }
      return super.getPreferredSize();
   }

   private static void createAndShowGui() {
      IntersectionImagePanel mainPanel = new IntersectionImagePanel();

      JFrame frame = new JFrame("IntersectionImage");
      frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      frame.getContentPane().add(mainPanel);
      frame.pack();
      frame.setLocationByPlatform(true);
      frame.setVisible(true);
   }

   public static void main(String[] args) {
      SwingUtilities.invokeLater(new Runnable() {
         public void run() {
            createAndShowGui();
         }
      });
   }
}
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, .

enter image description here

import javax.swing.*;
import java.awt.*;
import java.awt.image.*;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;

import java.util.Random;
import java.net.URL;
import javax.imageio.ImageIO;

public class ImageOnImage {

    ImageOnImage(final BufferedImage bg, BufferedImage fg) {
        final BufferedImage scaled = new BufferedImage(
            fg.getWidth()/2,fg.getHeight()/2,BufferedImage.TYPE_INT_RGB);
        Graphics g = scaled.getGraphics();
        g.drawImage(fg,0,0,scaled.getWidth(),scaled.getHeight(),null);
        g.dispose();

        final int xMax = bg.getWidth()-scaled.getWidth();
        final int yMax = bg.getHeight()-scaled.getHeight();

        final JLabel label = new JLabel(new ImageIcon(bg));

        ActionListener listener = new ActionListener() {

            Random random = new Random();

            public void actionPerformed(ActionEvent ae) {
                Graphics g = bg.getGraphics();
                int x = random.nextInt(xMax);
                int y = random.nextInt(yMax);

                g.drawImage( scaled, x, y, null );
                g.dispose();

                label.repaint();
            }
        };

        Timer timer = new Timer(1200, listener);
        timer.start();

        JOptionPane.showMessageDialog(null, label);
    }

    public static void main(String[] args) throws Exception {
        URL url1 = new URL("http://i.stack.imgur.com/lxthA.jpg");
        final BufferedImage image1 = ImageIO.read(url1);

        URL url2 = new URL("http://i.stack.imgur.com/OVOg3.jpg");
        final BufferedImage image2 = ImageIO.read(url2);

        //Create the frame on the event dispatching thread
        SwingUtilities.invokeLater(new Runnable(){
            @Override
            public void run() {
                new ImageOnImage(image2, image1);
            }
        });
    }
}
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