Angles (geometric), normalization and conversion

# title: Angles (geometric), normalization and conversion
# source: https://rosettacode.org/wiki/Angles_(geometric),_normalization_and_conversion
# category: Rosetta Code
# difficulty: Intro
# summary: Normalize degree angles and convert between degrees and radians for fixed sample values.
# tags: popular, math, geometry, conversion
# vibe: 0.2

def pi
  3.141592653589793
end

def normalize_360(angle)
  value = angle

  while value < 0
    value = value + 360
  end

  while value >= 360
    value = value - 360
  end

  value
end

def normalize_180(angle)
  value = normalize_360(angle)

  if value >= 180
    value - 360
  else
    value
  end
end

def degrees_to_radians(angle)
  angle * pi / 180
end

def radians_to_degrees(angle)
  angle * 180 / pi
end

def run
  {
    normalized_725: normalize_360(725),
    normalized_negative_45: normalize_360(-45),
    signed_725: normalize_180(725),
    signed_225: normalize_180(225),
    radians_from_225: degrees_to_radians(225),
    degrees_from_half_pi: radians_to_degrees(pi / 2)
  }
end