Vector2.h

/* ScummVM - Graphic Adventure Engine
 *
 * ScummVM is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * file distributed with this source distribution.
 *
 * This program 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.
 *
 * 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 the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

/*
 * Copyright (C) 2006-2010 - Frictional Games
 *
 * This file is part of HPL1 Engine.
 */

#ifndef HPL_VECTOR2_H
#define HPL_VECTOR2_H

#include "hpl1/engine/system/SystemTypes.h"

namespace hpl {

template<class T>
class cVector2 {
public:
    T x, y;
#if 0
            union{
                struct {
                    T x,y;
                };
                T v[2];
            };
#endif

    // Constructors
    constexpr cVector2() : x(0), y(0) {
    }

    constexpr cVector2(T aVal) : x(aVal), y(aVal) {
    }

    constexpr cVector2(T aX, T aY) : x(aX), y(aY) {
    }

    constexpr cVector2(cVector2<T> const &aVec) : x(aVec.x), y(aVec.y) {
    }

    // Copy

    inline cVector2<T> &operator=(const cVector2<T> &aVec) {
        x = aVec.x;
        y = aVec.y;
        return *this;
    }

    inline cVector2<T> &operator=(const T aVal) {
        x = aVal;
        y = aVal;
        return *this;
    }

    // Boolean

    inline bool operator==(const cVector2<T> &aVec) const {
        if (x == aVec.x && y == aVec.y)
            return true;
        else
            return false;
    }

    inline bool operator!=(const cVector2<T> &aVec) const {
        if (x == aVec.x && y == aVec.y)
            return false;
        else
            return true;
    }

    // Vector Arithmetic

    inline cVector2<T> operator+(const cVector2<T> &aVec) const {
        cVector2<T> vec;
        vec.x = x + aVec.x;
        vec.y = y + aVec.y;
        return vec;
    }

    inline cVector2<T> operator-(const cVector2<T> &aVec) const {
        cVector2<T> vec;
        vec.x = x - aVec.x;
        vec.y = y - aVec.y;
        return vec;
    }

    inline cVector2<T> operator*(const cVector2<T> &aVec) const {
        cVector2<T> vec;
        vec.x = x * aVec.x;
        vec.y = y * aVec.y;
        return vec;
    }

    inline cVector2<T> operator/(const cVector2<T> &aVec) const {
        cVector2<T> vec;
        vec.x = x / aVec.x;
        vec.y = y / aVec.y;
        return vec;
    }

    inline cVector2<T> &operator-=(const cVector2<T> &aVec) {
        x -= aVec.x;
        y -= aVec.y;
        return *this;
    }

    inline cVector2<T> &operator+=(const cVector2<T> &aVec) {
        x += aVec.x;
        y += aVec.y;
        return *this;
    }

    inline cVector2<T> &operator*=(const cVector2<T> &aVec) {
        x *= aVec.x;
        y *= aVec.y;
        return *this;
    }

    inline cVector2<T> &operator/=(const cVector2<T> &aVec) {
        x /= aVec.x;
        y /= aVec.y;
        return *this;
    }

    // Real Arithmetic

    inline cVector2<T> operator/(const T &aVal) const {
        cVector2<T> vec;
        vec.x = x / aVal;
        vec.y = y / aVal;
        return vec;
    }

    inline cVector2<T> operator*(const T &aVal) const {
        cVector2<T> vec;
        vec.x = x * aVal;
        vec.y = y * aVal;
        return vec;
    }

    inline cVector2<T> operator+(const T &aVal) const {
        cVector2<T> vec;
        vec.x = x + aVal;
        vec.y = y + aVal;
        return vec;
    }

    cVector2<T> operator-(const T &aVal) const {
        cVector2<T> vec;
        vec.x = x - aVal;
        vec.y = y - aVal;
        return vec;
    }

    // Methods

    inline void FromVec(const T *apVec) {
        x = apVec[0];
        y = apVec[1];
    }

    T Normalise() {
        T length = sqrt(x * x + y * y);

        if (length > 1e-08) {
            T InvLength = 1.0f / length;
            x *= InvLength;
            y *= InvLength;
        }

        return length;
    }

    // Printing

    tString ToString() const {
        char buf[512];
        snprintf(buf, 512, "%f : %f", x, y);
        tString str = buf;
        return str;
    }

    tString ToFileString() const {
        char buf[512];
        snprintf(buf, 512, "%g %g", x, y);
        tString str = buf;
        return str;
    }
};

} // namespace hpl

#endif // HPL_VECTOR2_H