如何在JMapViewer的两个点之间放置箭头之类的图像

Question

How I can put an image that goes from point p1 to point p2 ? Anyone can suggest a way to me?

Edit: I follow this example, Draw Line between two Geo Points in JMapViewer , to draw a path between two geoPoints . But when I try to delete a MapPolygon , that I created first, it's not work and I don't know why. The input is correct, trust me!

List<Coordinate> route = new ArrayList<Coordinate>(Arrays.asList(one, two, two));
        List<MapPolygon> lista=cartina.getMapPolygonList();
        MapPolygon arrow=new MapPolygonImpl(route);
        cartina.removeMapPolygon(arrow);

Edit: I do this:

private Coordinate one;
private Coordinate two;
public ExampleClass(Coordinate one, Coordinate two) {
    this.one=one;
    this.two=two;
}

public method (){ //click button
    List<Coordinate> route = new ArrayList<Coordinate>(Arrays.asList(one, two, two));
    map.addMapPolygon(new MapPolygonImpl(route));
}

public methodB(){// click anothe button
 List<Coordinate> route = new ArrayList<Coordinate>(Arrays.asList(one, two, two));
    map.removeMapPolygon()(new MapPolygonImpl(route));
}

Answer 1

How I can put an [arrow] that goes from point p1 to point p2 ?

As shown in this example , you can add an arrow shaped MapPolygon to your JMapViewer using addMapPolygon() .

After I delete a MapPolygon …and I create another LinkedList …the JMapViewer doesn't delete the MapPolygon . Do you know why?

Use the complementary method removeMapPolygon() to remove a MapPolygon , but be sure that it's a reference to the same MapPolygon that you added and not a reference to a LinkedList you might have used while creating the arrow. Use removeAllMapPolygons() to completely clear() the map viewer's internal list of polygons.

Addendum: Here's a concrete example illustrating addMapPolygon() and removeMapPolygon() .

List<Coordinate> route = new ArrayList<>(Arrays.asList(one, two, three));
final MapPolygonImpl mapPolygon = new MapPolygonImpl(route);
map.addMapPolygon(mapPolygon);
toolBar.add(new JButton(new AbstractAction("Remove") {

    @Override
    public void actionPerformed(ActionEvent e) {
        map.removeMapPolygon(mapPolygon);
    }
}));