source: osm/applications/editors/josm/plugins/slippy_map_chooser/src/SourceButton.java@ 13260

import java.awt.Graphics;
import java.awt.Point;

import javax.swing.ImageIcon;

import org.openstreetmap.josm.tools.ImageProvider;

public class SourceButton {

    private int x = 0;
    private int y = 30;

    private ImageIcon enlargeImage;
    private ImageIcon shrinkImage;
    private ImageIcon imageMapnik;
    private ImageIcon imageOsmarender;

    private boolean isEnlarged = false;

    private boolean isMapnik = true;

    public static final int HIDE_OR_SHOW = 1;
    public static final int MAPNIK = 2;
    public static final int OSMARENDER = 3;

    public SourceButton() {
        enlargeImage = ImageProvider.get("", "layer-switcher-maximize.png");
        shrinkImage = ImageProvider.get("", "layer-switcher-minimize.png");
        imageMapnik = ImageProvider.get("", "blue_Mapnik.png");
        imageOsmarender = ImageProvider.get("", "blue_Osmarender.png");
    }

    public void paint(Graphics g) {

        if (isEnlarged) {
            if (isMapnik) {
                g.drawImage(imageMapnik.getImage(), g.getClipBounds().width
                        - imageMapnik.getIconWidth(), y, null);
            } else {
                g.drawImage(imageOsmarender.getImage(), g.getClipBounds().width
                        - imageMapnik.getIconWidth(), y, null);
            }

            if (shrinkImage != null) {
                this.x = g.getClipBounds().width - shrinkImage.getIconWidth();
                g.drawImage(shrinkImage.getImage(), x, y, null);
            }

        } else {
            if (enlargeImage != null) {
                this.x = g.getClipBounds().width - enlargeImage.getIconWidth();
                g.drawImage(enlargeImage.getImage(), x, y, null);
            }
        }
    }

    public void toggle() {
        this.isEnlarged = !this.isEnlarged;

    }

    public int hit(Point point) {
        if (isEnlarged) {
            if (x < point.x && point.x < x + shrinkImage.getIconWidth()) {
                if (y < point.y && point.y < y + shrinkImage.getIconHeight()) {
                    return HIDE_OR_SHOW;
                }
            } else if (x - imageMapnik.getIconWidth() < point.x && point.x < x) {
                if (y < point.y && point.y < y + imageMapnik.getIconHeight() / 2) {
                    isMapnik = false;
                    return OSMARENDER;
                } else if (y + imageMapnik.getIconHeight() / 2 < point.y
                        && point.y < y + imageMapnik.getIconHeight()) {
                    isMapnik = true;
                    return MAPNIK;
                }
            }
        } else {
            if (x < point.x && point.x < x + enlargeImage.getIconWidth()) {
                if (y < point.y && point.y < y + enlargeImage.getIconHeight()) {
                    return HIDE_OR_SHOW;
                }
            }
        }

        return 0;
    }
    
    public void setIsMapStyleMapnik (boolean style) {
        isMapnik = style;
    }
}