added ball to ball collisions

[physics.git] / src / Vector2.cpp

/*
 *  Copyright (C) 2008 Patrik Gornicz, Gornicz_P (at) hotmail (dot) com.
 *
 *  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/>.
 */

#include "Vector2.h"
#include "mathw.h"

/// ***** Constructors/Destructors *****

Vector2::Vector2()
  : x(0), y(0)
{

}
Vector2::Vector2(float x, float y)
  : x(x), y(y)
{

}
Vector2::Vector2(const Vector2& vec)
  : x(vec.x), y(vec.y)
{

}
Vector2::~Vector2()
{

}

/// ***** Public Class Methods *****

void Vector2::zero()
{
    x = 0;
    y = 0;
}
void Vector2::unit()
{
    float len = length();

    x /= len;
    y /= len;
}

float Vector2::angle() const
{
    //TODO
    //return atan2A(y,x);
    return 0;
}
float Vector2::length() const
{
    return sqrt(sqrLength());
}
float Vector2::sqrLength() const
{
    return x*x + y*y;
}

float Vector2::dot(const Vector2& v) const
{
    return x*v.x + y*v.y;
}


string Vector2::toString() const
{
     // long just to be safe
    char* strX = new char[50];
    char* strY = new char[50];

    sprintf(strX, "%f", x);
    sprintf(strY, "%f", y);

    string val = (string)"Vector2  x: " + strX + ", y: " + strY;

     // deletes the allocated memory, not just what is used by sprintf
    delete []strX;
    delete []strY;

    return val;
}
void Vector2::print() const
{
    printf("%s\n",toString().c_str());
}


Vector2 Vector2::add(const Vector2& vec) const
{
    return Vector2(x+vec.x, y+vec.y);
}
Vector2 Vector2::subtract(const Vector2& vec) const
{
    return Vector2(x-vec.x, y-vec.y);
}
Vector2 Vector2::multiply(float c) const
{
    return Vector2(x*c, y*c);
}
Vector2 Vector2::divide(float c) const
{
    return Vector2(x/c, y/c);
}

/// ***** Public Methods *****

Vector2 operator+(const Vector2& vec1, const Vector2& vec2)
{
    return vec1.add(vec2);
}
Vector2 operator-(const Vector2& vec1, const Vector2& vec2)
{
    return vec1.subtract(vec2);
}
Vector2 operator*(float c, const Vector2& vec)
{
    return vec.multiply(c);
}
Vector2 operator*(const Vector2& vec, float c)
{
    return vec.multiply(c);
}
Vector2 operator/(const Vector2& vec, float c)
{
    return vec.divide(c);
}


void operator+=(Vector2& vec1, const Vector2& vec2)
{
    vec1.x += vec2.x;
    vec1.y += vec2.y;
}
void operator-=(Vector2& vec1, const Vector2& vec2)
{
    vec1.x -= vec2.x;
    vec1.y -= vec2.y;
}
void operator*=(Vector2& vec, float c)
{
    vec.x *= c;
    vec.y *= c;
}
void operator/=(Vector2& vec, float c)
{
    vec.x /= c;
    vec.y /= c;
}