Math

CMath::split

Given an input of float xf, assign the integer part to int xi, and the fractional (radix) part to float xr.

void CMath::split(float xf, float *xr, int *xi) {

  if (a1 <= 0.0f) {

    *xi = xf - 1;
    *xr = xf - *xi;

  } else {

    *xi = a1;
    *xr = xf - *xi;

  }

}

CMath::sinoid

double CMath::sinoid(float a1) {

  float v1 = a1 * 0.31830987 - 0.5;

  int xi;
  float xr;

  CMath::split(v1, &xr, &xi);

  float result = 1.0 - xr * ((6.0 - 4.0 * xr) * xr);

  if (xi & 1) {
    result = -result;
  }
  
  return result;

}