Extract the rotation component of the transformation matrix.
@param matrix the transformation matrix
@return the angle (in degrees) by which the transformation rotates the frame
counterclockwise. The angle will be in range [-180.0, 180.0],
or NaN if the matrix is singular.
@note floating point numbers are inherently inexact, so callers are
recommended to round the return value to nearest integer before use.
Extract the rotation component of the transformation matrix.
@param matrix the transformation matrix @return the angle (in degrees) by which the transformation rotates the frame counterclockwise. The angle will be in range [-180.0, 180.0], or NaN if the matrix is singular.
@note floating point numbers are inherently inexact, so callers are recommended to round the return value to nearest integer before use.