Point.java

Point.java

contents ::

  BasicData.java
  Line.java
  Point.java

/*
    Point.java

    Stewart Fleming
    March 2001

    Implements requirements for measurement system, requirement 11.1 Point
  */

package jlittle_ex2;

/**
* Simple class to represent a point with integer X and Y coordinates.
*/
public class Point {
         // requirement 11.1.1
         int xCoord, yCoord;

        /** Default points are constructed at the origin */
         Point() {
             xCoord = yCoord = 0;
        }

        /** Construct a point at the specified location */
        Point(int x, int y) {
           xCoord = x;
           yCoord = y;
        }

        /** Change the X coordinate of the point. */
         void setX(int x) {
             xCoord = x;
        }

        /** Returns the X coordinate of the point */
         int getX() {
             return xCoord;
        }

        /** Change the Y coordinate of the point. */
         void setY(int y) {
             yCoord = y;
        }

        /** Returns the Y coordinate of the point */
         int getY() {
             return yCoord;
        }

         /**
         * Test equality between two points.
         * Two points are equal if both X and Y coordinates are equal.
         * Requirement 11.1.2
         */
         boolean equals(Point p) {
             return ((xCoord == p.getX()) && (yCoord == p.getY()));
        }

         /**
         * Calculate the distance between two points.
         * Requirement 11.1.3
         */
         double Distance(Point p) {
            long dx, dy;

            dx = (p.getX() - xCoord);
            dy = (p.getY() - yCoord);
            return Math.sqrt((dx * dx) + (dy * dy));
         }
} // end of class Point

James Little