Transparent JPanel, Canvas background in JFrame
- by Andy Tyurin
I wanna make canvas background and add some elements on top of it. For this goal I made JPanel as transparent container with setOpaque(false) and added it as first of JFrame container, then I added canvas with black background (in future I wanna set animation) to JFrame as second element.
But I can't undestand why i see grey background, not a black.
Any suggestions?
public class Game extends JFrame {
public Container container; //Game container with components
public Canvas backgroundLayer; //Background layer of a game
public JPanel elementsLayer; //elements panel (top of backgroundLayer), holds different elements
private Dimension startGameDimension = new Dimension(800,600); //start game dimension
public Game() {
//init main window
super("Astra LaserForces");
setSize(startGameDimension);
setBackground(Color.CYAN);
container=getContentPane();
container.setLayout(null);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//init jpanel elements layer
elementsLayer=new JPanel();
elementsLayer.setSize(startGameDimension);
elementsLayer.setBackground(Color.BLUE);
elementsLayer.setOpaque(false);
container.add(elementsLayer);
//init canvas background layer
backgroundLayer = new Canvas();
backgroundLayer.setSize(startGameDimension);
backgroundLayer.setBackground(Color.BLACK); //set default black color
container.add(backgroundLayer);
}
//start game
public void start() {
setVisible(true);
}
//create new instance of game and start it
public static void main(String[] args) {
new Game().start();
}
}
