Creation of physics project

[physics.git] / src / Vector2.cpp

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

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)
{
}

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

  x /= len;
  y /= len;
}

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


string Vector2::toString() const
{
  char* strX = new char[50]; // long just to be safe
  char* strY = new char[50]; // long just to be safe
  sprintf(strX, "%f", x);
  sprintf(strY, "%f", y);

  string val = (string)"Vector2  x: " + strX + ", y: " + strY;
  delete []strX; // deletes the memory allocated, not just what is used by sprintf
  delete []strY; // deletes the memory allocated, not just what is used by sprintf

  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);
}


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;
}