Analysis of the principle of geometric framework in the Java class library

Analysis of the principle of geometric framework in the Java class library The geometric framework is an important part of the JAVA library for processing and operating geometric figures.It provides a rich set of categories and methods that can easily perform the creation, conversion, and computing operations of geometric objects such as points, lines, and polygons.The basic principles of the geometric framework and some example code will be introduced below. 1. Basic geometric objects and operations The geometric framework provides some basic geometric objects, such as Point (point), line (line), polygon (polygon), etc.These objects have corresponding classes to represent and provide some commonly used operation methods.For example, you can use the constructor of the Point class to create a point object, and use the Getx () and Gety () methods to obtain the coordinates of the point.You can use the constructor of the LINE class to create a line, and use GetStartpoint () and Getendpoint () to obtain the starting point and end point of the line. 2. Geometric transformation and operation The geometric framework also provides some methods for geometric transformation and operation.For example, you can use the AffinetransForm class to perform transformation operations such as translation, rotation, and zooming.Using the translate () method to translate geometric objects, the Rotate () method can rotate geometric objects, and the scale () method can be scalfed with geometric objects. Example code 1: Create a point object and get its coordinates Point point = new Point(3, 4); int x = point.getX(); int y = point.getY(); System.out.println ("" point coordinates: " + x +", " + y); Example code 2: Create a line and get its starting point and end point Point startPoint = new Point(0, 0); Point endPoint = new Point(5, 5); Line line = new Line(startPoint, endPoint); Point start = line.getStartPoint(); Point end = line.getEndPoint(); System.out.println (the starting point of the "line is:" + Start.getx () + "," + Start.get ()); System.out.println (the end point of the "line is" + end.getx () + "," + end.get ()); 3. Geometric calculation and judgment The geometric framework also provides some methods for geometric calculations and judgments.For example, you can use the distance () method to calculate the distance between the two points, and the contains () method to determine whether a point is inside the polygon. Example code 3: Calculate the distance between two points Point point1 = new Point(0, 0); Point point2 = new Point(3, 4); double distance = point1.distance(point2); System.out.println ("The distance between two points is:" + distance); Example code 4: Determine whether a point is inside the polygonal shape Point point = new Point(3, 3); Polygon polygon = new Polygon(); polygon.addPoint(0, 0); polygon.addPoint(0, 5); polygon.addPoint(5, 5); polygon.addPoint(5, 0); boolean isInside = polygon.contains(point); System.out.println ("Is the point inside the polygon:" + isinside); In summary, the geometric framework is an important part of the Java class library to handle and operate geometric figures.By using the class and methods provided by the geometric framework, it can be easily created, converted, and calculated the geometric objects.At the same time, the geometric framework also provides some methods for geometric calculations and judgments, making the processing of geometric graph more efficient and convenient.