How to use the geometric framework in Java
How to use geometric frameworks in Java
Geometric framework is an important part of computer graphics. It provides a series of tools and methods for processing geometric graphics.Java provides multiple class libraries to help developers easily use the geometric framework.In this article, we will introduce how to use the geometric framework in Java.
1. The geometric framework in the java class library
The most common geometric framework in the Java class library is the Java Geometry library.The library provides rich geometric graphics, such as points, lines, polygons, rectangles, etc.It contains a set of classes and methods that can be used to build and operate geometric objects.
2. Use the geometric framework to operate
The following is an example code that uses the Java Geometry library for point operation:
import org.locationtech.jts.geom.Coordinate;
import org.locationtech.jts.geom.GeometryFactory;
import org.locationtech.jts.geom.Point;
public class PointOperations {
public static void main(String[] args) {
// Create a geometric factory
GeometryFactory factory = new GeometryFactory();
// Create a point object
Point point = factory.createPoint(new Coordinate(1, 2));
// Get the coordinates of the point
Coordinate coordinate = point.getCoordinate();
System.out.println ("X coordinates:" + coordinate.getx ());
System.out.println ("y coordinate:" + coordinate.get ());
}
}
The above code first introduced the related class of the Java Geometry library.Then, a GeometryFactory object was created.By calling the Createpoint () method of the factory object, we created a point object.Finally, a point coordinate was obtained through the getcoordInate () method, and it was printed.
Third, use the geometric framework for line operation
The following is an example code that uses the Java Geometry library to operate line operation:
import org.locationtech.jts.geom.*;
public class LineStringOperations {
public static void main(String[] args) {
// Create a geometric factory
GeometryFactory factory = new GeometryFactory();
// Create a line object
Coordinate[] coordinates = new Coordinate[]{
new Coordinate(1, 2),
new Coordinate(3, 4),
new Coordinate(5, 6)
};
LineString line = factory.createLineString(coordinates);
// Get the length of the line
double length = line.getLength();
System.out.println ("Line length:" + length);
}
}
The above code creates a geometric factory object and a line object.The structure of the line requires a set of coordinate points. The coordinate array can be converted into a line object through the CreateLineString () method.Finally, by calling the getLength () method, the length of the line is obtained and it is printed.
4. Use the geometric frame for polygon operation
The following is an example code for polygon operations using the Java Geometry library:
import org.locationtech.jts.geom.*;
public class PolygonOperations {
public static void main(String[] args) {
// Create a geometric factory
GeometryFactory factory = new GeometryFactory();
// Create a polygon object
Coordinate[] coordinates = new Coordinate[]{
new Coordinate(1, 2),
new Coordinate(3, 4),
new Coordinate(5, 6),
New Coordinal (1, 2) // The last coordinates and the first coordinates are repeated, forming a closed polygon
};
LinearRing shell = factory.createLinearRing(coordinates);
Polygon polygon = factory.createPolygon(shell, null);
// The judgment point is inside the polygon
Point testPoint = factory.createPoint(new Coordinate(4, 5));
boolean contains = polygon.contains(testPoint);
System.out.println ("Whether or not in the polygon:" + contains);
}
}
The above code creates a geometric factory object, a linearring, and a polygonal object.Through the CreateLinearring () and CreatePolygon () methods, the wire ring objects and other auxiliary objects can be converted into polygonal objects.Finally, through the Contains () method, a point was judged whether a point was inside the polygon and printed the results.
Through the above example, we can see that the use of geometric frameworks in Java is very simple.Through the class and methods provided in the class library, we can easily build and operate geometric objects to achieve the needs of various geometric graphics processing.
