JTs algorithm package

Angle Analysis (Angle):

Com. vividsolutions. JTs. algorithm. Angle

Coordinate tip1 = new coordinate (); coordinate tail = new coordinate (); coordinate tip2 = new coordinate (); angle = new angle (); // returns the two undirected least difference angles in the range of [0,180] Double radia1 = angle. angle (tip1, tail); double radia2 = angle. angle (tail, tip2); system. out. println (angle. todegrees (angle. diff (radia1, radia2); // returns the smallest angle between two vectors. The range is [0,180] Double ang1 = angle. anglebetween (tip1, tail, tip2); system. out. println (angle. todegrees (ang1); // The direction from angle to angle. // public static final int clockwise =-1; clockwise // public static final int counterclockwise = 1; counter-clockwise system. out. println (angle. getturn (radia1, radia2); // determines whether the angle from tip1-> tail-> tip2 is an acute angle system. out. println (angle. isacute (tip1, tail, tip2); // determines whether the angle from tip1-> tail-> tip2 is an empty angle system. out. println (angle. isobtuse (tip1, tail, tip2); // angle-> radian conversion system. out. println (angle. todegrees (math. pi); // radians-> Angle conversion system. out. println (angle. toradians (180 ));

Output result:

11.309932474020213
168.6900675259798
-1
False
True
180.0
3.141592653589793

Basic Geometric algorithms (Cgalgorithms):

Com. vividsolutions. JTs. algorithm. cgalgorithms

Geometryfactory. Java

import com.vividsolutions.jts.geom.Geometry;import com.vividsolutions.jts.io.ParseException;import com.vividsolutions.jts.io.WKTReader;public class GeometryFactory {private WKTReader reader;private static GeometryFactory instance = null;public static synchronized GeometryFactory getInstance() {if (instance == null) {instance = new GeometryFactory();}return instance;}public void getReader() {reader = new WKTReader();}public Geometry buildGeo(String str) {try {if (reader == null) {reader = new WKTReader();}return reader.read(str);} catch (ParseException e) {throw new RuntimeException("buildGeometry Error", e);}}}

Private Static geometryfactory factory = geometryfactory. getinstance (); // defines the ring geometry G = factory. buildgeo ("linestring (0, 2, 5, 0 5, 0 0)"); coordinate [] coords = G. getcoordinates (); // points to the system on the ring. out. println (cgalgorithms. ispointinring (new coordinate (4, 4), coords); // point in the ring system. out. println (cgalgorithms. ispointinring (new coordinate (), coords); // calculates the shortest distance from line AB to CD. out. println (cgalgorithms. d Istancelineline (new coordinate (), new coordinate (); // calculate the shortest distance from A to CD. out. println (cgalgorithms. distancepointline (new coordinate (), new coordinate [] {new coordinate (), new coordinate )})); // whether the ring is clockwise oriented to system. out. println (cgalgorithms. isccw (new coordinate [] {new coordinate (1, 1), new coordinate (2, 0), n EW coordinate (), new coordinate ()}); // indicates whether the system is online. out. println (cgalgorithms. isonline (new coordinate (2, 1), new coordinate [] {new coordinate (2, 0), new coordinate (2, 2), new coordinate (1, 1 )})); // calculate the intersection of two lines and return coordinate points. Hcoordinate hcoord = new hcoordinate (new coordinate (), new coordinate (); try {system. out. println (hcoord. getx (); system. out. println (hcoord. gety ();} catch (notrepresentableexception E1) {// throw this exception, indicating that the two line segments are parallel. E1.printstacktrace ();} // equivalent hcoordinate Hd = new hcoordinate (); try {system. out. println (HD. intersection (new coordinate (), new coordinate ();} catch (notrepresentableexception E) {// throw this exception, indicating that the two line segments are parallel. E. printstacktrace ();} // relationship between the point and the object (geometry) // public final static int interior = 0; in the internal // public final static int boundary = 1; in the boundary // public final static int exterior = 2; in the external // public final static int none =-1; pointlocator PL = new pointlocator (); // online system. out. println (pl. locate (new coordinate (0, 0), factory. buildgeo ("linestring (0, 2, 5, 0 5)"); // on the system. out. println (pl. locate (new coordinate (0, 0), factory. buildgeo ("polygon (0, 5, 0,); // System in the plane. out. println (pl. locate (new coordinate (1, 3), factory. buildgeo ("polygon (0, 5, 0,); // system outside the surface. out. println (pl. locate (new coordinate (10, 10), factory. buildgeo ("polygon (0 0 ))")));

Output result:

True
True
1.4142135623730951
1.4142135623730951
True
True
2.0
2.0
(2.0, 2.0, Nan)
1
1
0
2