Question

Must be in Java.

Show proper reasoning with step by step process.

Comment on the code please and show proper indentation.

Use simplicity.

Must match the exact Output.

You are developing a painting application for tablet computers. One of the features you want to implement is a line draw mode. In this mode, users tap two spots on the screen and these form the two endpoints for the line segment. You begin by defining a core class that the interface will use. You are asked to: 1. Use the Point class a. the class has already been implemented-it will be essential to review the methods in the class before and during coding 2. Implement a LineSegment class a. LineSegment objects will have two Point instance variables, representing a line segment's endpoints. b. Define a constructor that takes two Point objects and initializes the endpoint instance variables using them. implement an equals method on the LineSegment class such that two line segments are the same if they have the same endpoints. The method signature we will use for equals is as follows: public Boolean equals (LineSegment other) d. Implement a toString method, which takes no arguments and returns a String representation of the LineSegment, in the format shown in the example below: LineSegment (0,0) (4,0)

CODE GIVEN:

LineSegment.java

LineSegmentTest.java

Point.java

public class Point {

private double x, y; // x and y coordinates of point

/**
* Creates an instance of Point with the provided coordinates
* @param inX the x coordinate
* @param inY the y coordinate
*/
public Point (double inX, double inY) {
this.x = inX;
this.y = inY;
}

/**
* Creates a duplicate Point
* @param toCopy the Point to duplicate
*/
public Point (Point toCopy) {
this (toCopy.x, toCopy.y);
  
}

// GETTERS
public double getX () { return x; }
public double getY () { return y; }

// SETTERS
public void setX (double newX) { x = newX; }
public void setY (double newY) { y = newY; }

/**
* Returns the Euclidean distance between this Point and the provided one.
* @param other the other Point
* @return the Euclidean distance
*/
public double distance (Point other) {
   double result = Math.sqrt (Math.pow (this.x-other.x, 2) + Math.pow (this.y-other.y,2));
   return result;
}

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

public boolean equals (Object o) {
   if (this == o) return true;
   if (!(o instanceof Point)) return false;
   Point p = (Point) o;
   return (this.x == p.x && this.y == p.y);
}
}

Answer 1

Here is the completed code for this problem. Comments are included, go through it, learn how things work and let me know if you have any doubts or if you need anything to change. If you are satisfied with the solution, please rate the answer. Thanks

// LineSegment.java

public class LineSegment {

      // two end points

      private Point p1;

      private Point p2;

      // constructor taking two end points

      public LineSegment(Point p1, Point p2) {

            this.p1 = p1;

            this.p2 = p2;

      }

      // returns true if two line segments are equal

      public boolean equals(Object o) {

            // checking if o is a LineSegment

            if (o instanceof LineSegment) {

                  // safe type casting

                  LineSegment other = (LineSegment) o;

                  // if this.p1=other.p1 & this.p2=other.p2 or this.p1=other.p2 &

                  // this.p2=other.p1, line segments are equal

                  if ((this.p1.equals(other.p1) && this.p2.equals(other.p2))

                              || (this.p1.equals(other.p2) && this.p2.equals(other.p1))) {

                        return true;

                  }

            }

            // not equal

            return false;

      }

      // returns a String in proper format containing end points info

      public String toString() {

            return "LineSegment " + p1 + " " + p2;

      }

}

// LineSegmentTest.java

import java.util.Scanner;

public class LineSegmentTest {

      public static void main(String[] args) {

            //scanner for user input

            Scanner scanner = new Scanner(System.in);

            //reading two double values, creating first point

            Point p1 = new Point(scanner.nextDouble(), scanner.nextDouble());

            //reading two double values, creating second point

            Point p2 = new Point(scanner.nextDouble(), scanner.nextDouble());

            //creating a LineSegement using these points

            LineSegment line1 = new LineSegment(p1, p2);

            //doing the same for creating another line segment

            Point p3 = new Point(scanner.nextDouble(), scanner.nextDouble());

            Point p4 = new Point(scanner.nextDouble(), scanner.nextDouble());

            LineSegment line2 = new LineSegment(p3, p4);

            //displaying both

            System.out.println(line1);

            System.out.println(line2);

            //displaying a message if they are equal

            if (line1.equals(line2)) {

                  System.out.println("The line segments are equal.");

            }

      }

}

/*OUTPUT*/

0 0 10 0

10 0 0 0

LineSegment (0.0,0.0) (10.0,0.0)

LineSegment (10.0,0.0) (0.0,0.0)

The line segments are equal.