Program to Create a Rectangle objects defined by Two Points

Define a class for rectangle objects defined by two points, the top-left and bottom-right corners of the rectangle. Include a constructor to copy a rectangle, a method to return a rectangle object that encloses the current object and the rectangle passed as an argument, and a method to display the defining points of a rectangle. Test the class by creating four rectangles and combining these cumulatively to end up with a rectangle enclosing them all. Output the defining points of all the rectangles you create.

This is the Point class definition. It is used by the Rectangle class

public class Point {
  // Create a Point object from a coordinate pair
  public Point(double x, double y) {
    this.x = x;
    this.y = y;
  }

  // Create a Point object from another Point
  public Point(Point p) {
    x = p.x;
    y = p.y;
  }

  // Get the value of the x coordinate
  double getX() {
    return x;
  }

  // Get the value of the y coordinate
  double getY() {
    return y;
  }

  public String toString(){
    return x +","+y;
  }

  // Fields store the point coordinates
  private double x;
  private double y;
}

This is the Rectangle class definition. It makes use of the Point class definition that is in the same directory as this file.

public class Rectangle {
  private Point topLeft;
  private Point bottomRight;

  // Constructors
  public Rectangle(double x1, double y1, double x2, double y2) {
    // Ensure topleft uses the smaller of x1,x2 and y1,y2
    // and topright uses the larger of x1,x2 and y1,y2
    topLeft = new Point(Math.min(x1,x2),Math.min(y1,y2));
    bottomRight = new Point(Math.max(x1,x2),Math.max(y1,y2));
  }

  public Rectangle(Point tl, Point br) {
    this(tl.getX(), tl.getY(), br.getX(), br.getY());
  }

  public Rectangle(Rectangle rect) {
    topLeft = new Point(rect.topLeft);
    bottomRight = new Point(rect.bottomRight);
  }

  // Methods to create a rectangle enclosing the current rectangle and the argument
  public Rectangle encloses(Rectangle rect) {
    // Return a new rectangle defined by the minimum x,y for to left and the and maximum x,y for bottom right
    return new Rectangle(Math.min(topLeft.getX(), rect.topLeft.getX()),
                         Math.min(topLeft.getY(), rect.topLeft.getY()),
                         Math.max(bottomRight.getX(), rect.bottomRight.getX()),
                         Math.max(bottomRight.getY(), rect.bottomRight.getY()));

  }

  public String toString()  {
    return "Rectangle: " + topLeft + " : " + bottomRight;
  }
}

This is the main Class to Test the Rectangle Class.

public class TestRectangle {
  public static void main(String args[]) {
    Rectangle[] rects = new Rectangle[4];
    Rectangle enclosing;

    // Initialize the rectangles as arbitrary sizes and at arbitrary positions:
    for(int i = 0 ; i < rects.length ; ++i) {
      rects[i] = new Rectangle(Math.random()*100, Math.random()*100, Math.random()*100, Math.random()*100);
      System.out.print("Coords of rectangle " + i + " are: ");
      System.out.println(rects[i]);
    }

    // Initialize the enclosing rectangle to be first rectangle
    enclosing = rects[0];

    // Combine it with each the other rectangles in turn.
    // This will result in the rectangle that encloses them all.
    for(Rectangle rect : rects)  {
      enclosing = enclosing.encloses(rect);
    }

    System.out.println("\nCoords of Enclosing rectangle are ");
    System.out.println(enclosing);
  }
}

Output of Above Java Program
Coords of rectangle 0 are: Rectangle: 0.1903728640358593,58.04643476457927 : 0.2032621709617044,85.8337274416007
Coords of rectangle 1 are: Rectangle: 6.239529478079319,44.58944044246343 : 66.47238823570548,57.983153189860396
Coords of rectangle 2 are: Rectangle: 10.500877688164522,59.35612909169482 : 80.53072142287722,99.35041648038772
Coords of rectangle 3 are: Rectangle: 28.73052501676693,2.2641735796500972 : 44.35555027080914,11.239350082208022

Coords of Enclosing rectangle are
Rectangle: 0.1903728640358593,2.2641735796500972 : 80.53072142287722,99.35041648038772