java如何在JMapViewer中的两点之间放置像箭头一样的图像

Question

如何将图像从点p1放置到点p2？有人能给我提个建议吗

Edit：我遵循这个例子Draw Line between two Geo Points in JMapViewer，在两个geoPoints之间绘制一条路径。但是当我试图删除我首先创建的MapPolygon时，它不起作用，我不知道为什么。输入是正确的，相信我

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

编辑：我这样做：

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?

如图example所示，您可以使用addMapPolygon()将箭头形状的MapPolygon添加到JMapViewer中

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

使用互补方法removeMapPolygon()删除MapPolygon，但确保它是对添加的相同的MapPolygon的引用，而不是对创建箭头时可能使用的LinkedList的引用。使用removeAllMapPolygons()完全clear()地图查看器的内部多边形列表

附录：这里有一个具体的例子来说明addMapPolygon()和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);
    }
}));