You could try painting something onto the Graphics.
You shouldn't be loading images inside the paint method, this will only slow down the repaints and potentially consume more resources. Load the image once and maintain a reference to it.
class Tracker extends JPanel
{
String imageFile = "areal view.JPG";
private Image image;
public Tracker()
{
super();
init();
}
public Tracker(String image)
{
super();
this.imageFile = image;
init();
}
public Tracker(LayoutManager layout)
{
super(layout);
init();
}
protected void init() {
ImageIcon imageicon = new ImageIcon(getClass().getResource(imageFile));
image = imageicon.getImage();
}
public void paintComponent(Graphics g)
{
super.paintComponent(g);
if (image != null) {
g.drawImage(image, 100, 50, 700, 600, this);
g.setColor(Color.RED);
g.fillOval(290, 215, 20, 20);
}
}
}
I'd recommend that you take a look at Performing Custom Painting and 2D Graphics
Update with additional example
From you comments, I would suggest using a JLayeredPane. It will allow you to place custom components at arbitrary locations over your image.
public class Tracker {
public static void main(String[] args) {
new Tracker();
}
public Tracker() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
}
// 247x178
MapPane mapPane = new MapPane();
Marker marker = new Marker();
marker.setToolTipText(
"<html><table><tr><td valign=top><img src='" + getClass().getResource("/Earth.png") + "'>" +
"</td><td valign=top><b>Earth</b><br>Mostly Harmless</td></tr></table></html>"
);
marker.setSize(marker.getPreferredSize());
marker.setLocation(237, 188 - marker.getHeight());
mapPane.add(marker);
JFrame frame = new JFrame("Test");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new BorderLayout());
frame.add(mapPane);
frame.setResizable(false);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class Marker extends JLabel {
public Marker() {
try {
setIcon(new ImageIcon(ImageIO.read(getClass().getResource("/Marker.png"))));
} catch (IOException ex) {
ex.printStackTrace();
}
}
}
public class MapPane extends JLayeredPane {
private BufferedImage map;
public MapPane() {
try {
map = ImageIO.read(getClass().getResource("/SolarSystem.jpg"));
} catch (Exception e) {
}
}
@Override
public Dimension getPreferredSize() {
return map == null ? super.getPreferredSize() : new Dimension(map.getWidth(), map.getHeight());
}
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
if (map != null) {
g.drawImage(map, 0, 0, this);
}
}
}
}
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