GameCodingCompleteLinux/Source/GCC4/Utilities/types.h

#pragma once
//========================================================================
// types.h : Defines some basic types, replacing the need for atltypes.h
//            or project specific include files that are used frequently, but
//            are changed infrequently
//
// GameCode4 is the sample application that encapsulates much of the source code
// discussed in "Game Coding Complete - 4th Edition" by Mike McShaffry and David
// "Rez" Graham, published by Charles River Media. 
// ISBN-10: 1133776574 | ISBN-13: 978-1133776574
//
// If this source code has found it's way to you, and you think it has helped you
// in any way, do the authors a favor and buy a new copy of the book - there are 
// detailed explanations in it that compliment this code well. Buy a copy at Amazon.com
// by clicking here: 
//    http://www.amazon.com/gp/product/1133776574/ref=olp_product_details?ie=UTF8&me=&seller=
//
// There's a companion web site at http://www.mcshaffry.com/GameCode/
// 
// The source code is managed and maintained through Google Code: 
//    http://code.google.com/p/gamecode4/
//
// (c) Copyright 2012 Michael L. McShaffry and David Graham
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser GPL v3
// as published by the Free Software Foundation.
//
// This program 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 
// http://www.gnu.org/licenses/lgpl-3.0.txt for more details.
//
// You should have received a copy of the GNU Lesser GPL v3
// along with this program; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
//
//========================================================================

#include <math.h>

//---------------------------------------------------------------------------------------------------------------------
// This class represents a single point in 2D space
//---------------------------------------------------------------------------------------------------------------------
class Point
{
public:
	long x, y;

	// construction
	Point(void) { x = y = 0; }
	Point(const long newX, const long newY) { x = newX; y = newY; }
	Point(const Point& newPoint)  { x = newPoint.x; y = newPoint.y; }
	Point(const Point* pNewPoint) { x = pNewPoint->x; y = pNewPoint->y; }

	// assignment
	Point& operator=(const Point& newPoint) { x = newPoint.x; y = newPoint.y; return (*this); }
	Point& operator=(const Point* newPoint) { x = newPoint->x; y = newPoint->y; return (*this); }

	// addition/subtraction
	Point& operator+=(const Point& newPoint) { x += newPoint.x; y += newPoint.y; return (*this); }
	Point& operator-=(const Point& newPoint) { x -= newPoint.x; y -= newPoint.y; return (*this); }
	Point& operator+=(const Point* newPoint) { x += newPoint->x; y += newPoint->y; return (*this); }
	Point& operator-=(const Point* newPoint) { x -= newPoint->x; y -= newPoint->y; return (*this); }
	Point& operator+(const Point& other) { Point temp(this); temp += other; temp += other; return (*this); }
	Point& operator-(const Point& other) { Point temp(this); temp -= other; temp -= other; return (*this); }

	// comparison
	bool operator==(const Point& other) const { return ((x == other.x) && (y == other.y)); }
	bool operator!=(const Point& other) const { return ((x != other.x) || (y != other.y)); }

	// accessors (needed for Lua)
	long GetX() const { return x; }
	long GetY() const { return y; }
	void SetX(const long newX) { x = newX; }
	void SetY(const long newY) { y = newY; }
	void Set(const long newX, const long newY) { x = newX; y = newY; }	

	float Length() const { return sqrt((float)(x*x+y*y)); }
};

inline Point operator-(const Point& left, const Point& right) { Point temp(left); temp -= right; return temp; }