/*
 * Copyright 2013 John Zahorjan
 *
 *  This file is code developed as part of
 *  one of the UW CSE 333 lectures (333exercises).
 *
 *  333exercises is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  333exercises is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with 333exercises.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>

//-------------------------------------------------------------------
// Point

typedef struct Point_st {
  float x;
  float y;
} Point;

Point ORIGIN = {0.0, 0.0};

//-------------------------------------------------------------------

//-------------------------------------------------------------------
// Vector

typedef Point Vector;
Vector UNIT_X = {1.0, 0.0};
Vector UNIT_Y = {0.0, 1.0};

//-------------------------------------------------------------------

//-------------------------------------------------------------------
// Rect

typedef struct Rect_st {
  Point ll;   // lower left
  Point ur;   // upper right
} Rect;

//-------------------------------------------------------------------

Point Point_add(Point p, Vector v) {
  Point result = {p.x + v.x, p.y + v.y};
  return result;
}

bool Rect_containsPoint(Rect r, Point p) {
  return p.x >= r.ll.x && p.x <= r.ur.x && p.y >= r.ll.y && p.y <= r.ur.y;
}

//-------------------------------------------------------------------
// main
//-------------------------------------------------------------------

void Usage(char *argv[]) {
  printf("Usage: %s  x y\nWhere x and y describe a point.\n", argv[0]);
  printf("Prints whether the point is in the unit rectangle or not.\n");
  exit(EXIT_FAILURE);
}

int main(int argc, char* argv[]) {
  float  inputX, inputY;

  Point unitCorner = Point_add(Point_add(ORIGIN, UNIT_X), UNIT_Y);
  Rect unitRect = { ORIGIN, unitCorner };

  if ( argc != 3 ) Usage(argv);
  if ( sscanf(argv[1], "%f", &inputX) != 1 ) Usage(argv);
  if ( sscanf(argv[2], "%f", &inputY) != 1 ) Usage(argv);
  Point userPoint = { inputX, inputY };

  if ( Rect_containsPoint(unitRect, userPoint) )
    printf("Point is in the unit rectangle\n");
  else
    printf("Point is not in the unit rectangle\n");

  return EXIT_SUCCESS;
}