Question

我目前正在研究一种方法，该方法应该从wkt文件中提取坐标。 WktFile由9个多面体组成，并具有以下结构：

MULTIPOLYGON(((4.4490734644205 -2.82592405702356 -0.603974130600466,4.61552064787664 -3.29977100457644 -0.600505503171231,4.61981670064913 -3.31128249271675 -0.936085060875472,4.4490734644205 -2.82592405702356 -0.603974130600466)),((4.4490734644205 -2.82592405702356 -0.603974130600466,4.61981670064913 -3.31128249271675 -0.936085060875472,4.44887485891923 -2.83819021528408 -0.942217436432726,4.4490734644205 -2.82592405702356 -0.603974130600466)))

每个Multipolygon有两个多边形，每个多边形包含4个点。首先，我编写了一个返回三维数组列表的方法（我只需要x和y坐标）。

    package org.hs.mainz.praktikum.wktReader;
import java.awt.geom.Point2D;
import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import com.vividsolutions.jts.geom.Coordinate;
import com.vividsolutions.jts.geom.Geometry;
import com.vividsolutions.jts.geom.impl.CoordinateArraySequence;
import com.vividsolutions.jts.io.ParseException;
import com.vividsolutions.jts.io.WKTFileReader;
import com.vividsolutions.jts.io.WKTReader;
public class PointList3 {

public List<List<List<Point2D>>> getPoints() throws IOException, ParseException {
    File file = new File("C:\\\\Users\\\\Maximilian\\\\Desktop\\\\Praktikum\\\\totalMonitors.wkt");
    WKTReader r = new WKTReader();
    WKTFileReader fr = new WKTFileReader(file, r);
    List<Geometry> geometries = fr.read();
    List<List<Point2D>> listPolygonPoints = new ArrayList<>();
    List<List<List<Point2D>>> listPoints = new ArrayList<>();

    for (Geometry g : geometries) {
        Coordinate[] c = g.getGeometryN(0).getCoordinates();
        CoordinateArraySequence s = new CoordinateArraySequence(c);
        List<List<Point2D>> polygonPoints = new ArrayList<>();
        for (int i = 0; i < g.getNumGeometries(); i++) {
            List<Point2D> points = new ArrayList<>();
            for (int j = 0; j < g.getGeometryN(0).getNumPoints(); j++) {
                double posX = s.getOrdinate(j, 0);
                double posY = s.getOrdinate(j, 1);
                Point2D point = new Point2D.Double(posX, posY);
                points.add(point);
            }
            listPolygonPoints.add(points);
        }
        listPoints.add(polygonPoints);
    }
    return listPoints;

}

}

控制台显示以下内容：

[[], [], [], [], [], [], [], [], [], []]

，如果没有获取IndexException，我将无法访问内部多边形。在第二步中，我想使用Path2D绘制所有多边形。

    package org.hs.mainz.praktikum.wktReader;

import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Polygon;
import java.awt.geom.Ellipse2D;
import java.awt.geom.Line2D;
import java.awt.geom.Path2D;
import java.awt.geom.Point2D;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import javax.swing.JPanel;
import com.vividsolutions.jts.io.ParseException;

public class Display extends JPanel {
    /**
     * 
     */
    private static final long serialVersionUID = 1L;
    private int width;
    private int height;
    private PointList2 p = new PointList2();

    public Display() {
        setLayout(null);
        width = 400;
        height = 400;
        repaint();
    }

    public void paintComponent(Graphics g) {
        super.paintComponent(g);
        setBackground(Color.WHITE);
        Graphics2D g2 = (Graphics2D) g;
        g2.translate(height, width);

        try {
            Path2D path = new Path2D.Double();
            for (int multiPolygon = 0; multiPolygon < p.getPoints().size(); multiPolygon++) {
                System.out.println(p.getPoints().get(multiPolygon).size());
                for (int polygon = 0; polygon < p.getPoints().get(multiPolygon).size(); polygon++) {
                    path.moveTo(p.getPoints().get(multiPolygon).get(polygon).getX()*100,
                            p.getPoints().get(multiPolygon).get(0).getY()*100);
                    for (int line = polygon; line < p.getPoints().get(polygon).size(); line++) {
                        path.lineTo(p.getPoints().get(multiPolygon).get(line).getX()*100,
                                p.getPoints().get(multiPolygon).get(line).getY()*100);

                    }

                    path.closePath();   
                }
                g2.draw(path);  
            }

        } catch (IOException | ParseException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
    }

此代码相当老，并且已为2DArrayList配置。这是有问题的，因为只绘制了一个多多边形中的两个多边形。因此，我想一个3DArrayList可以解决这个问题。

任何想法都可以通过遵循上面的给定结构来绘制多面体。

谢谢：）

带坐标的三维ArrayList

0 个答案: