[tools] get angle of a vector

#include <cmath>

/* ************************************************************************* */
/**
 * @brief This function computes the angle from the vector given by (X Y). From 0 to 2*Pi
 */
inline float getAngleV2(float x, float y) {

    float theta = atan2f(y,x);

    if (theta >= 0)
    return theta;
    else
    return theta + static_cast<float>(2.0f*CV_PI);
}

/* ************************************************************************* */
/**
 * @brief This function checks descriptor limits
 * @param x X Position
 * @param y Y Position
 * @param width Image width
 * @param height Image height
 */
inline void checkDescriptorLimitsV2(int &x, int &y, int width, int height) {

  if (x < 0) {
    x = 0;
  }

  if (y < 0) {
    y = 0;
  }

  if (x > width - 1) {
    x = width - 1;
  }

  if (y > height - 1) {
    y = height - 1;
  }
}

/* ************************************************************************* */
/**
 * @brief This function rounds float to nearest integer
 * @param flt Input float
 * @return dst Nearest integer
 */
inline int fRoundV2(float flt) {
  return (int)(flt + 0.5f);
}