CODEWITHSUNDEEP
javaimageswing
maniak
maniak

Reputation: 462

Overlapping image in java

I want to overlap two image. For that, I use JLabel and set an ImageIcon to it. I also have a JPanel using a gridlayout containing my images (like a tile-based map). So far, no problem and it works great.

The problem I encounter, is when I tried to overlap two image. For that, I tried with a JLayeredPane in the gridlayout and put two images (JLabel) in a different level. This method throws me this exception:

Exception in thread "AWT-EventQueue-0" java.lang.IllegalArgumentException: Comparison method violates its general contract!

I made some research and tried to downgrade to jdk-6 instead of 7, cause it appears that in the jdk-7 it doesn't work well. The exception has now disappeared, but nothing is drawn on the screen.

Then I tried a new method by creating a class that extends JComponent and I override the paintComponent() method. My class contain an arrayList of my images (JLabel) and in the paintComponent method, I iterate through the arrayList and call each label's paintComponent method with the Graphics object of my own class. The same exception is raised.

Here's a sample my paintComponent method:

@Override
public void paintComponent(Graphics g) {
    for(JLabel label : this.images) {
        label.paintComponents(g);
    }
}

Upvotes: 1

Views: 2119

Answers (2)

Dan D.
Dan D.

Reputation: 32391

If overridding paint or paintComponent is an option then I would suggest you use the Graphics or Graphics2d APIs for drawing images:

g.drawImage();

It offers a lot more flexibility for what you need.

Upvotes: 2

mKorbel
mKorbel

Reputation: 109813

you can to use

  1. JLayer (Java7) based on JXLayer (Java6)

  2. GlassPane

  3. OverlayLayout

  4. JLayeredPane

then you can (for example) moving or animate with Icons / ImageIcons placed in JLabel

Upvotes: 4

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