使用getGpxTrack()绘制JXMapKit路线

Question

我正在尝试使用下面的源代码在道路上绘制一条路线：

final List<GeoPosition> region = new ArrayList<GeoPosition>();

Painter<JXMapViewer> lineOverlay = new Painter<JXMapViewer>() {

public void paint(Graphics2D g, JXMapViewer map, int w, int h) {
  region.add(new GeoPosition(5.42031,100.34389));
  region.add(new GeoPosition(5.41984,100.33924));
  region.add(new GeoPosition(5.42300,100.33456));


  g = (Graphics2D) g.create();
  //convert from viewport to world bitmap
  Rectangle rect = jXMapKit1.getMainMap().getViewportBounds();
  g.translate(-rect.x, -rect.y);

  //do the drawing
  g.setColor(Color.RED);
  g.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
  g.setStroke(new BasicStroke(2));

  int lastX = -1;
  int lastY = -1;
  for (GeoPosition gp : region.getGpxTrack()) 
  {
     //convert geo to world bitmap pixel
     Point2D pt = jXMapKit1.getMainMap().getTileFactory().geoToPixel(gp, jXMapKit1.getMainMap().getZoom());
     if (lastX != -1 && lastY != -1) {
        g.drawLine(lastX, lastY, (int) pt.getX(), (int) pt.getY());
     }
     lastX = (int) pt.getX();
     lastY = (int) pt.getY();
  }
  System.out.println("I am here");
  g.dispose();

   }


   };

但是，我在region.getGpxTrack()行得到一个错误。我尝试使用region only GeoPosition gp : region，它只在两点之间画了一条线。我要的是一条公路路线。有人知道我哪里搞错了吗？

Answer 1

好的，我做了同样的事情，看看如果你像我在评论中假设的那样，用region替换region.getGpxTrack()，它是否可以工作。是的，它可以工作。这是一个完整的应用程序，其中包含了你想要做的事情：

import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.Rectangle;
import java.awt.RenderingHints;
import java.awt.geom.Point2D;
import java.util.ArrayList;
import java.util.List;

import javax.swing.JFrame;

import org.jdesktop.swingx.JXMapKit;
import org.jdesktop.swingx.JXMapKit.DefaultProviders;
import org.jdesktop.swingx.JXMapViewer;
import org.jdesktop.swingx.mapviewer.GeoPosition;
import org.jdesktop.swingx.painter.Painter;

public class Starter {
    public static void main(final String[] args) {    
        final JFrame f = new JFrame();
        f.setSize(500, 300);
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        final JXMapKit jXMapKit1 = new JXMapKit();
        jXMapKit1.setDefaultProvider(DefaultProviders.OpenStreetMaps);
        jXMapKit1.setCenterPosition(new GeoPosition(5.41984, 100.33924));
        jXMapKit1.setZoom(3);

        final List<GeoPosition> region = new ArrayList<GeoPosition>();
        region.add(new GeoPosition(5.42031, 100.34389));
        region.add(new GeoPosition(5.41984, 100.33924));
        region.add(new GeoPosition(5.42300, 100.33456));

        final Painter<JXMapViewer> lineOverlay = new Painter<JXMapViewer>() {

            @Override
            public void paint(Graphics2D g, final JXMapViewer map, final int w, final int h) {
                g = (Graphics2D) g.create();
                // convert from viewport to world bitmap
                final Rectangle rect = jXMapKit1.getMainMap().getViewportBounds();
                g.translate(-rect.x, -rect.y);

                // do the drawing
                g.setColor(Color.RED);
                g.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
                g.setStroke(new BasicStroke(2));

                int lastX = -1;
                int lastY = -1;
                for (final GeoPosition gp : region) {
                    // convert geo to world bitmap pixel
                    final Point2D pt = jXMapKit1.getMainMap().getTileFactory().geoToPixel(gp, jXMapKit1.getMainMap().getZoom());
                    if (lastX != -1 && lastY != -1) {
                        g.drawLine(lastX, lastY, (int) pt.getX(), (int) pt.getY());
                    }
                    lastX = (int) pt.getX();
                    lastY = (int) pt.getY();
                }

                g.dispose();

            }

        };

        jXMapKit1.getMainMap().setOverlayPainter(lineOverlay);

        f.setContentPane(jXMapKit1);
        f.setVisible(true);

    }
}