#include <stdio.h>
#include <math.h>
#include "point.h"

/** 
  * @param x latitude location value
  * @param y longitute location value
  * @return returns a point in x and y location.
  * It fills the location information of a point. 
  */
Point* mkpt(int x, int y) {
        Point *p = new Point();

        p->xval = x;
        p->yval = y;

        return p;
}

/** 
  * @param a start point
  * @param b end point
  * @return distance between a and b points
  * It uses Pythagorean theorem to figure out the distance to another point.
  */
double dist(Point a, Point b) {
        int xd = a.xval - b.xval;
        int yd = a.yval - b.yval;
        return sqrt(xd*xd + yd*yd);
}

/**
  * @param a first point
  * @param b second point
  * @return new point with a and b location added
  * It adds the x and y value of point a and b and returns a new point with new location
  */
Point *add(Point *a, Point *b)
{
        return mkpt(a->xval + b->xval, a->yval + b->yval);
}
/**
  * @param a first point
  * @param b second point
  * @return new point with a and b location subtracted
  * It subtracts the x and y value of point a and b and returns a new point with new location
  */
Point *sub(Point a, Point b)
{
        return mkpt(a.xval - b.xval, a.yval - b.yval);
}

/**
  * @param a x value
  * @param b y value
  * @param p new point to be made
  * It moves to point p by adding value of p's x and y to a and b
  */
void move(Point *p, double a, double b)
{
        p->xval += a;
        p->yval += b;
}

/**
  * @param A point to be printed.
  *  Print the point to standard output.  The class ostream is a base class
  * for output streams of various types. 
  */
void print(Point p)
{
        printf("(%d,%d)", p.xval, p.yval);
}

/**
  * @param x first point
  * @param op operation
  * @param y second point
  * @param z third point
  * Print a line of the form x op y = z, where x, y, and z are points.
  */
void prline(Point x, char *op, Point y, Point z)
{
        print(x);
        printf(" %s ", op);
        print(y);
        printf(" = ");
        print(z);
        printf("\n");
}