overlay.java

Developing Games in Java 源代码

package com.brackeen.javagamebook.graphics3D;

import java.awt.Graphics2D;
import com.brackeen.javagamebook.math3D.ViewWindow;

/**
    An overlay drawn over a game scene.
*/
public interface Overlay {


    /**
        Updates this overlay with the specified amount of
        elapsed time since the last update.
    */
    public void update(long elapsedTime);

    /**
        Draws an overlay onto a frame. The ViewWindow specifies
        the bounds of the view window (usually, the entire
        screen). The screen bounds can be retrieved by calling
        g.getDeviceConfiguration().getBounds();
    */
    public void draw(Graphics2D g, ViewWindow viewWindow);


    /**
        Returns true if this overlay is enabled (should be drawn).
    */
    public boolean isEnabled();
}