Java Swing -超出第一次绘制的线条位于单独的图层上

Question

我正在构建一个Java Swing应用程序，尝试在地图上绘制多条线来表示路点。这些路点通常以这样的形式相交:一个路点的终点是另一个路点的起点。我的问题是，只有第一条绘制的线条会像预期的那样出现，而其他的线条将会“漂浮”在似乎是另一个图层的地方(见下图)。我不太确定为什么会这样，因为代码不应该在同一个Graphics2D对象上划线吗？我在一些相关的问题中看到，隐式JPanel创建的问题导致了一些类似的问题，但我认为这里不应该是这样的？任何帮助都将不胜感激。

private void drawRoute( final Graphics2D g, final JXMapViewer map, List<List<? extends GeoPosition>> tracks)
{
    for (List<? extends GeoPosition> track : tracks) {

        int lastX = 0;
        int lastY = 0;

        boolean first = true;

        for (GeoPosition gp : track)
        {
            // convert geo-coordinate to world bitmap pixel
            Point2D pt = map.getTileFactory().geoToPixel(gp, map.getZoom());

            if (first)
            {
                first = false;
            }
            else
            {
                double curX = pt.getX();
                double curY = pt.getY();
                Line2D.Double testLine = new Line2D.Double(lastX, lastY, curX, curY);
                //g.drawLine(lastX, lastY, (int) curX, (int) curY);
                g.draw(testLine);
            }

            lastX = (int) pt.getX();
            lastY = (int) pt.getY();
        }
    }
}

private void paintLeg( final Leg start, final Leg end, final Graphics2D graphics,
                           final JXMapViewer map , Optional<Color> color)
    {   
        Point2D pointStart = map.getTileFactory().geoToPixel(positionToGeo(start.terminatorPosition()),
                                                             map.getZoom());

        Point2D pointEnd = map.getTileFactory().geoToPixel(positionToGeo(end.terminatorPosition()),
                                                           map.getZoom());

        Line2D.Double line = new Line2D.Double(pointStart, pointEnd);

        Rectangle clipBounds = map.getViewportBounds();
        if (clipBounds.contains(pointStart) || clipBounds.contains(pointEnd) || clipBounds.intersectsLine(line))
        {
            List<GeoPosition> track = new ArrayList<>();

            double[] curCoords = new double[2]; // hold the waypoint coords
            curCoords[0] = start.terminatorPosition().latitudeDegrees();
            curCoords[1] = start.terminatorPosition().longitudeDegrees();                
            GeoPosition startPosition = new GeoPosition(curCoords);
            track.add(startPosition);
            curCoords[0] = end.terminatorPosition().latitudeDegrees();
            curCoords[1] = end.terminatorPosition().longitudeDegrees();
            GeoPosition endPosition = new GeoPosition(curCoords);
            track.add(endPosition);

            // convert from viewport to world bitmap
            Rectangle rect = map.getViewportBounds();
            graphics.translate(-rect.x, -rect.y);

            tracks.add(track);

            // do the drawing
            if (color.isPresent()) {
                graphics.setColor(color.get());
            }
            else {
                graphics.setColor(Color.BLACK);
            }
            graphics.setStroke(new BasicStroke(4));

            drawRoute(graphics, map, tracks);
        }
    }

@Override
    protected void doPaint( final Graphics2D graphics, final JXMapViewer map,
                            final int width, final int height )
    {
        // API doesn't provide any guarantee on nullability of these arguments. To be
        // safe, check this and do nothing if so.
        if ((graphics != null) && (map != null))
        {
            Optional<Color> color = Optional.empty();
            Optional<Integer> startAndEnd = Optional.empty();
            paintLegs(flightPlanLegs, graphics, map, color, startAndEnd, startAndEnd);
        }
    }

private final JXMapKit          map               = new JXMapKit();
private final FixPainter        fixPainter        = new FixPainter();
private final RoutePainter      routePainter      = new RoutePainter();
private final DataCreditPainter dataCreditPainter = new DataCreditPainter();
private Iterable<? extends Fix> databaseFixes     = ImmutableList.of();
private Iterable<? extends Fix> selectedFixes     = ImmutableList.of();
private Iterable<? extends Leg> flightPlanLegs    = ImmutableList.of();
private List<List<? extends GeoPosition>> tracks  = ArrayList<>();

 private void initializeMap()
{
    map().setDefaultProvider(DefaultProviders.OpenStreetMaps);
    map().setDataProviderCreditShown(true);

    // Create a compound painter for all of the painters
    CompoundPainter<JXMapViewer> painter =
        new CompoundPainter<>(ImmutableList.of(fixPainter, dataCreditPainter,
                                               routePainter));
    painter.setCacheable(false);

    map().getMainMap().setOverlayPainter(painter);
    map().setTileFactory(MapBoxTileFactoryInfo.newTileFactory());

    zoom(DEFAULT_ZOOM);
    replaceFlightPlan(null);
}

void replaceFlightPlan( final Iterable<? extends Leg> legs )
{
  Leg fpl1 = new Leg()
  {

      @Override
      public Position terminatorPosition()
      {
          return Position.of(47, -122);
      }

      @Override
      public String identifier()
      {
          return "fpl1";
      }
  };
  Leg fpl2 = new Leg()
  {

      @Override
      public Position terminatorPosition()
      {
          return Position.of(48, -111);
      }

      @Override
      public String identifier()
      {
          return "fpl2";
      }
  };
  Leg fpl3 = new Leg()
  {

      @Override
      public Position terminatorPosition()
      {
          return Position.of(32, -111);
      }

      @Override
      public String identifier()
      {
          return "fpl3";
      }
  };
  ArrayList<Leg> ok = new ArrayList<>();
  ok.add(fpl1);
  ok.add(fpl2);
  ok.add(fpl3);
  flightPlanLegs = ImmutableList.copyOf(ok);
  Iterator<List<? extends GeoPosition>> tracksItr = tracks.iterator();
  while (tracksItr.hasNext()) {
      tracksItr.remove();
  }
}

​

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英国的线应该从美国的线结束的地方开始。