CODEWITHSUNDEEP
javaswingcanvasjframeawt
homerun
homerun

Reputation: 20745

How to ignore JFrame opacity?

I need to achieve the effect of "lights off" while displaying animation. It's currently been done with transparent Jframe, black background with 50% opacity the size of the monitor. then, there is this canvas component which should draw RGBA buffered-image.

Problems pops up when the the JFrame opacity effects the Canvas as well, making it semi transparent. That's what i'm trying to avoid.

//** Window class extends Canvas

public Window(){

    GraphicsDevice gd = GraphicsEnvironment.getLocalGraphicsEnvironment().getDefaultScreenDevice();
    int hostMonitorWidth = gd.getDisplayMode().getWidth();
    int hostMonitorHeight = gd.getDisplayMode().getHeight();

    Dimension dimension = new Dimension(hostMonitorWidth, hostMonitorHeight);
    super.setPreferredSize(dimension);

    window = new JFrame();
    window.setUndecorated(true);
    window.setOpacity(0.55f);
    window.setLayout(new GridLayout());
    window.setSize(hostMonitorWidth, hostMonitorHeight);
    window.add(this);

    window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    window.setLocationRelativeTo(null);
    window.setVisible(true);
    window.requestFocus();
    window.setFocusableWindowState(true);


    super.createBufferStrategy(3);
}

public void draw(){
    BufferStrategy buffer = super.getBufferStrategy();
    java.awt.Graphics g = buffer.getDrawGraphics();

    g.setColor(Color.BLACK);
    g.fillRect(0,0, super.getWidth(), super.getHeight());
    g.drawImage(batch.getImage(), 0, 0, super.getWidth(), super.getHeight(), null);

    g.dispose();
    buffer.show();
}

I have tried couple combinations of the following code with Jpanel, Layered Panes, Jlabel and what not. It's always seems to keep the opacity / throwing unexplainable exceptions / not working for any reason.

Am i doing it the correct way? what am i missing here?

Upvotes: 0

Views: 152

Answers (1)

MadProgrammer
MadProgrammer

Reputation: 347194

Don't use setOpacity, use setBackground on the JFrame and pass it a alpha based color. This will allow the frame to become transparent without affecting the other components.

You may, however, find that Canvas doesn't like alpha based colors (as it only has an opaque state)

Upvotes: 2

Related Questions