Creation of physics project

[physics.git] / src / mathw.cpp

#include "mathw.h"


/// ***** Private Varibles *****

const float PI = 3.141592653;


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

int mod(int x, int y)
{
  return x % y + (x < 0 ? y : 0);
}

float radsToA(float rads)
{
  return ftofix(rads * 128/PI);
}

float atanA(float c)
{
  return radsToA(atan(c)) + itofix(64);
}

float atan2A(float y, float x)
{
  return radsToA(atan2(y,x)) + itofix(64);
}

/// Vector2 Math

Vector2 perp(const Vector2& vec)
{
  return Vector2(-vec.y, vec.x);
}

float dot(const Vector2& vec1, const Vector2& vec2)
{
  return vec1.x * vec2.x + vec1.y * vec2.y;
}

//TODO float Vector2::projectionCoeff(const Vector2* vec) const;
//TODO Vector2* Vector2::projection(const Vector2* vec) const;