JTS(Geometry)工具类

空间数据模型
(1)、JTS Geometry model
(2)、ISO Geometry model (Geometry Plugin and JTS Wrapper Plugin)
GeoTools has two implementations of these interfaces:
Geometry Plugin a port of JTS 1.7 to the ISO Geometry interfaces

JTS Wrapper Plugin an implementation that delegates all the work to JTS

JTS包结构

系（linearref包）、计算交点（noding包）、几何图形操作（operation包）、平面图（planargraph包）、多边形化（polygnize包）、精度（precision）、工具（util包）

重点理解JTS Geometry model
(1) JTS提供了如下的空间数据类型
Point
MultiPoint
LineString
LinearRing 封闭的线条
MultiLineString 多条线
Polygon
MultiPolygon

GeometryCollection 包括点，线，面

(2) 支持接口
Coordinate
Coordinate（坐标）是用来存储坐标的轻便的类。它不同于点，点是Geometry的子类。不像模范Point的对象（包含额外的信息，例如一个信包，一个精确度模型和空间参考系统信息），Coordinate只包含纵座标值和存取方法。
Envelope(矩形)
一个具体的类，包含一个最大和最小的x 值和y 值。
GeometryFactory
GeometryFactory提供一系列的有效方法用来构造来自Coordinate类的Geometry对象。支持接口

import org.geotools.geometry.jts.JTSFactoryFinder;import com.vividsolutions.jts.geom.Coordinate;
import com.vividsolutions.jts.geom.Envelope;
import com.vividsolutions.jts.geom.Geometry;
import com.vividsolutions.jts.geom.GeometryCollection;
import com.vividsolutions.jts.geom.GeometryFactory;
import com.vividsolutions.jts.geom.LineString;
import com.vividsolutions.jts.geom.LinearRing;
import com.vividsolutions.jts.geom.Point;
import com.vividsolutions.jts.geom.Polygon;
import com.vividsolutions.jts.geom.MultiPolygon;
import com.vividsolutions.jts.geom.MultiLineString;
import com.vividsolutions.jts.geom.MultiPoint;
import com.vividsolutions.jts.io.ParseException;
import com.vividsolutions.jts.io.WKTReader;/**  * Class GeometryDemo.java * Description Geometry 几何实体的创建，读取操作* Company mapbar * author Chenll E-mail: Chenll@mapbar.com* Version 1.0 * Date 2012-2-17 上午11:08:50*/
public class GeometryDemo {private GeometryFactory geometryFactory = JTSFactoryFinder.getGeometryFactory( null );/*** create a point* @return*/public Point createPoint(){Coordinate coord = new Coordinate(109.013388, 32.715519);Point point = geometryFactory.createPoint( coord );return point;}/*** create a rectangle(矩形)* @return*/public Envelope createEnvelope(){Envelope envelope = new Envelope(0,1,0,2);return envelope;}/*** create a point by WKT* @return* @throws ParseException */public Point createPointByWKT() throws ParseException{WKTReader reader = new WKTReader( geometryFactory );Point point = (Point) reader.read("POINT (109.013388 32.715519)");return point;}/*** create multiPoint by wkt* @return*/public MultiPoint createMulPointByWKT()throws ParseException{WKTReader reader = new WKTReader( geometryFactory );MultiPoint mpoint = (MultiPoint) reader.read("MULTIPOINT(109.013388 32.715519,119.32488 31.435678)");return mpoint;}/*** * create a line* @return*/public LineString createLine(){Coordinate[] coords  = new Coordinate[] {new Coordinate(2, 2), new Coordinate(2, 2)};LineString line = geometryFactory.createLineString(coords);return line;}/*** create a line by WKT* @return* @throws ParseException*/public LineString createLineByWKT() throws ParseException{WKTReader reader = new WKTReader( geometryFactory );LineString line = (LineString) reader.read("LINESTRING(0 0, 2 0)");return line;}/*** create multiLine * @return*/public MultiLineString createMLine(){Coordinate[] coords1  = new Coordinate[] {new Coordinate(2, 2), new Coordinate(2, 2)};LineString line1 = geometryFactory.createLineString(coords1);Coordinate[] coords2  = new Coordinate[] {new Coordinate(2, 2), new Coordinate(2, 2)};LineString line2 = geometryFactory.createLineString(coords2);LineString[] lineStrings = new LineString[2];lineStrings[0]= line1;lineStrings[1] = line2;MultiLineString ms = geometryFactory.createMultiLineString(lineStrings);return ms;}/*** create multiLine by WKT* @return* @throws ParseException*/public MultiLineString createMLineByWKT()throws ParseException{WKTReader reader = new WKTReader( geometryFactory );MultiLineString line = (MultiLineString) reader.read("MULTILINESTRING((0 0, 2 0),(1 1,2 2))");return line;}/*** create a polygon(多边形) by WKT* @return* @throws ParseException*/public Polygon createPolygonByWKT() throws ParseException{WKTReader reader = new WKTReader( geometryFactory );Polygon polygon = (Polygon) reader.read("POLYGON((20 10, 30 0, 40 10, 30 20, 20 10))");return polygon;}/*** create multi polygon by wkt* @return* @throws ParseException*/public MultiPolygon createMulPolygonByWKT() throws ParseException{WKTReader reader = new WKTReader( geometryFactory );MultiPolygon mpolygon = (MultiPolygon) reader.read("MULTIPOLYGON(((40 10, 30 0, 40 10, 30 20, 40 10),(30 10, 30 0, 40 10, 30 20, 30 10)))");return mpolygon;}/*** create GeometryCollection  contain point or multiPoint or line or multiLine or polygon or multiPolygon* @return* @throws ParseException*/public GeometryCollection createGeoCollect() throws ParseException{LineString line = createLine();Polygon poly =  createPolygonByWKT();Geometry g1 = geometryFactory.createGeometry(line);Geometry g2 = geometryFactory.createGeometry(poly);Geometry[] garray = new Geometry[]{g1,g2};GeometryCollection gc = geometryFactory.createGeometryCollection(garray);return gc;}/*** create a Circle  创建一个圆，圆心(x,y) 半径RADIUS* @param x* @param y* @param RADIUS* @return*/public Polygon createCircle(double x, double y, final double RADIUS){final int SIDES = 32;//圆上面的点个数Coordinate coords[] = new Coordinate[SIDES+1];for( int i = 0; i < SIDES; i++){double angle = ((double) i / (double) SIDES) * Math.PI * 2.0;double dx = Math.cos( angle ) * RADIUS;double dy = Math.sin( angle ) * RADIUS;coords[i] = new Coordinate( (double) x + dx, (double) y + dy );}coords[SIDES] = coords[0];LinearRing ring = geometryFactory.createLinearRing( coords );Polygon polygon = geometryFactory.createPolygon( ring, null );return polygon;}/*** @param args* @throws ParseException */public static void main(String[] args) throws ParseException {GeometryDemo gt = new GeometryDemo();Polygon p = gt.createCircle(0, 1, 2);//圆上所有的坐标(32个)Coordinate coords[] = p.getCoordinates();for(Coordinate coord:coords){System.out.println(coord.x+","+coord.y);}Envelope envelope = gt.createEnvelope();System.out.println(envelope.centre());}
}

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