Marking places on the map

.gitignore

@@ -5,3 +5,7 @@ bin
 *.jar
 *.war
 *.ear
+
+# IntelliJ idea files
+.idea/
+*.iml

README.md

@@ -2,3 +2,10 @@ mappanel
 ========
 
 MapPanel renders OpenstreetMaps using just basic java. Rendering is done from a tileserver and uses some multithreaded tile loading, caching and zooming. Free for everyone to build his own stuff on.
+
+Marking places on the map
+=========================
+The class `com.roots.map.overlay.OverlayDemo` demonstrates how to mark places, identiefied by latitude and 
+longitude on the map.
+
+`com.roots.map.overlay.DemoGlassPane` is setup to display marks at two cities - Artyom, Russia and Cologne, Germany.

src/com/roots/map/MapPanel.java

@@ -86,6 +86,7 @@
 import javax.swing.text.html.StyleSheet;
 import javax.xml.parsers.SAXParserFactory;
 
+import com.roots.map.overlay.ILatLongToScreenCoordinatesConverter;
 import org.xml.sax.Attributes;
 import org.xml.sax.SAXException;
 import org.xml.sax.helpers.DefaultHandler;
@@ -129,7 +130,7 @@
  * @author stepan.rutz
  * @version $Revision$
  */
-public class MapPanel extends JPanel {
+public class MapPanel extends JPanel implements ILatLongToScreenCoordinatesConverter {
 
     private static final Logger log = Logger.getLogger(MapPanel.class.getName());
 

src/com/roots/map/overlay/DemoGlassPane.java

@@ -0,0 +1,18 @@
+package com.roots.map.overlay;
+
+import java.awt.*;
+import java.awt.geom.Point2D;
+
+public class DemoGlassPane extends PointSetMarkingGlassPane {
+
+    public static final Point2D.Double ARTYOM = new Point.Double(132.18381, 43.35514);
+
+    public static final Point2D.Double COLOGNE = new Point.Double(6.96202, 50.93575);
+
+    public DemoGlassPane(ILatLongToScreenCoordinatesConverter latitudeLongitudeToScreenCoordinatesConverter) {
+        super(latitudeLongitudeToScreenCoordinatesConverter);
+
+        addPointToMark(ARTYOM);
+        addPointToMark(COLOGNE);
+    }
+}

src/com/roots/map/overlay/IGlassPane.java

@@ -0,0 +1,5 @@
+package com.roots.map.overlay;
+
+public interface IGlassPane {
+    void repaint();
+}

src/com/roots/map/overlay/ILatLongToScreenCoordinatesConverter.java

@@ -0,0 +1,7 @@
+package com.roots.map.overlay;
+
+import java.awt.*;
+
+public interface ILatLongToScreenCoordinatesConverter {
+    Point getScreenCoordinates(Point.Double coords);
+}

src/com/roots/map/overlay/OverlayDemo.java

@@ -0,0 +1,32 @@
+package com.roots.map.overlay;
+
+import com.roots.map.MapPanel;
+
+import javax.swing.*;
+import java.awt.*;
+
+public class OverlayDemo {
+    public void run()
+    {
+        final JFrame mainFrame = new JFrame("MapPanel with place marks");
+        final MapPanel mapPanel = new MapPanel(new Point(3636598, 1535138), 14);
+        mainFrame.add(mapPanel);
+
+        final DemoGlassPane glassPane = new DemoGlassPane(mapPanel);
+
+        mainFrame.setGlassPane(glassPane);
+
+        mainFrame.getGlassPane().setVisible(true);
+
+        mainFrame.pack();
+        mainFrame.setVisible(true);
+
+    }
+
+    public static void main(final String[] aArgs)
+    {
+        final OverlayDemo app = new OverlayDemo();
+
+        app.run();
+    }
+}

src/com/roots/map/overlay/PointSetMarkingGlassPane.java

@@ -0,0 +1,38 @@
+package com.roots.map.overlay;
+
+import javax.swing.*;
+import java.awt.*;
+import java.util.*;
+import java.util.List;
+
+public class PointSetMarkingGlassPane extends JComponent implements IGlassPane {
+    private final ILatLongToScreenCoordinatesConverter latLongToScreenCoordinatesConverter;
+    private final List<Point.Double> pointsToMark = new LinkedList<Point.Double>();
+
+    public PointSetMarkingGlassPane(final ILatLongToScreenCoordinatesConverter aConverter) {
+        this.latLongToScreenCoordinatesConverter = aConverter;
+    }
+
+    protected void addPointToMark(final Point.Double aPoint)
+    {
+        if (aPoint != null)
+        {
+            pointsToMark.add(aPoint);
+        }
+    }
+
+    @Override
+    protected void paintComponent(final Graphics aGraphics) {
+        for (final Point.Double pointToMark : pointsToMark)
+        {
+            final Point positionInScreenCoords = latLongToScreenCoordinatesConverter.getScreenCoordinates(pointToMark);
+            drawCircle(aGraphics, positionInScreenCoords, Color.red);
+        }
+    }
+
+    private void drawCircle(Graphics g, Point point, Color color) {
+        g.setColor(color);
+        g.fillOval(point.x, point.y, 10, 10);
+    }
+
+}