root/trunk/BackgroundMap.java

/**
 * BackgroundMap.java
 *
 * This abstract class represents a map, which is essentially a background image
 * drawn behind Nodes and Edges on the JGraphViewer.  It knows how to paint
 * itself onto a Graphics2D, and that's about it.
 *
 */

import java.awt.*;
import java.awt.geom.*;
import java.awt.image.*;
import java.io.*;

public abstract class BackgroundMap implements Serializable {
        static final long serialVersionUID = -687681269250506246L;

        /**
         * Paints the map onto the given Graphics2D object, using realToScreen
         * to transform the real coordinates the map knows about to screen
         * coordinates it uses to draw on the Graphics2D.  observer should be
         * the component being painted on, in which case that component will
         * be repainted as more of the images load.
         */
        public abstract void paint(Graphics2D g, AffineTransform realToScreen, ImageObserver observer);

        public abstract Rectangle2D getRealBoundingRectangle();

        /// Returns the "ideal" scale in pixels per meter
        public abstract double getPixelForPixelScale();

        public void setDescription(String desc) { description = desc; }
        public String getDescription() { return description; }
        private String description = "";
}