source: osm/applications/editors/josm/plugins/slippy_map_chooser/src/SourceButton.java@ 9623

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

import javax.swing.ImageIcon;
import javax.vecmath.Color3f;

import org.openstreetmap.josm.tools.ImageProvider;




public class SourceButton {
        
        private int x =0;
        private int y = 30;     
        
        private int enlagedWidth = 200;
        private int enlargedHeight = 50;
        
        private ImageIcon enlargeImage;
        private ImageIcon shrinkImage;
        private ImageIcon imageMapnik;
        private ImageIcon imageOsmarender;
        
        private boolean isEnlarged = false;
        
        private boolean isMapnik = true;
        
        private static final String SOURCE_1 = "Osmarender";
        private static final String SOURCE_2 = "Mapnik";
        
        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;
        }
}