Class: PROJ4::Geod

Inherits:
Object
  • Object
show all
Defined in:
lib/proj4r.rb

Instance Method Summary collapse

Constructor Details

#initialize(*argv) ⇒ Geod

Returns a new instance of Geod.



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# File 'lib/proj4r.rb', line 63

def initialize (*argv)
  if argv.size == 1 and (arg = argv.first).is_a?(String)
    pj = Proj.new("+proj=latlon " + arg)
    a = pj.a
    f = pj.f
    @fr_meter = pj.fr_meter
    @to_meter = 1.0/@fr_meter
    _initialize(a,f)
  else
    @fr_meter = 1.0
    @to_meter = 1.0
    _initialize(*argv)
  end
end

Instance Method Details

#distance(*argv) ⇒ Object 



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# File 'lib/proj4r.rb', line 132

def distance (*argv)
  case argv.size
  when 4
    lat1, lon1, lat2, lon2 = *argv
    if lat1.is_a?(CArray) and lon1.is_a?(CArray) and
        lat2.is_a?(CArray) and lon2.is_a?(CArray)
      dist = lon1.template
      _distance_ca(lat1, lon1, lat2, lon2, dist)
      return dist*@fr_meter
    else
      return _distance(lat1, lon1, lat2, lon2)*@fr_meter
    end
  when 5
    _distance_ca(*argv)
    argv[4] *= @fr_meter
    return self
  else
    raise "invalid # of argument 4 or 5 required"        
  end
end

#forward(*argv) ⇒ Object 



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# File 'lib/proj4r.rb', line 78

def forward (*argv)
  case argv.size
  when 4
    lat1, lon1, az12, dist = *argv
    if lat1.is_a?(CArray) and lon1.is_a?(CArray) and
        az12.is_a?(CArray) and dist.is_a?(CArray)
      lon2 = lon1.template
      lat2 = lat1.template
      az21 = az12.template
      _forward_ca(lat1, lon1, az12, dist*@to_meter, lat2, lon2, az21)
      return [lon2, lat2, az21]
    else
      return _forward(lat1, lon1, az12, dist*@to_meter)
    end
  when 7
    argv[2] *= @to_meter
    return _forward_ca(*argv)
  else
    raise "invalid # of argument 4 or 7 required"
  end
end

#geodline(lat0, lon0, lat1, lon1, count: nil, interval: nil) ⇒ Object 



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# File 'lib/proj4r.rb', line 153

def geodline (lat0, lon0, lat1, lon1, count: nil, interval: nil)

  total_geod_S, az12, az21 = self.inverse(lat0, lon0, lat1, lon1)
  total_geod_S *= @fr_meter

  if not count.nil? and interval.nil?
    del_S = total_geod_S / ( count - 1 )
  elsif count.nil? and not interval.nil?
    del_S = interval
  else
    del_S = total_geod_S / ( 100 - 1 )
  end

  list = []
  list.push [lon0, lat0, 0]
  
  geod_S = del_S
  loop do 
    lat, lon, az21 = self.forward(lat0, lon0, az12, geod_S*@to_meter)
    list.push [lat, lon, geod_S]
    geod_S += del_S
    if geod_S >= total_geod_S
      break
    end
  end

  list.push [lat1, lon1, total_geod_S]
  
  return list
end

#inverse(*argv) ⇒ Object 



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# File 'lib/proj4r.rb', line 100

def inverse (*argv)
  case argv.size
  when 4
    lat1, lon1, lat2, lon2 = *argv
    if lat1.is_a?(CArray) and lon1.is_a?(CArray) and
        lat2.is_a?(CArray) and lon2.is_a?(CArray)
      dist = lat1.template
      az12 = lat1.template
      az21 = lat1.template
      _inverse_ca(lat1, lon1, lat2, lon2, dist, az12, az21)
      az21 += 180
      az21[:gt,180] -= 360
      return dist*@fr_meter, az12, az21
    else
      dist, az12, az21 = *_inverse(lat1, lon1, lat2, lon2)
      az21 += 180
      if az21 > 180
        az21 -= 360
      end
      return dist*@fr_meter, az12, az21
    end
  when 7
    _inverse_ca(*argv)
    argv[4] *= @fr_meter
    argv[6] += 180
    argv[6][:gt,180] -= 360
    return self
  else
    raise "invalid # of argument 4 or 7 required"        
  end
end