121 lines
3.9 KiB
Elixir
121 lines
3.9 KiB
Elixir
defmodule AprsmeWeb.MapLive.MapHelpers do
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@moduledoc false
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alias Aprs.Types.MicE
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@spec get_coordinates(map() | struct()) :: {number() | nil, number() | nil, map() | nil}
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def get_coordinates(%{data_extended: %MicE{} = mic_e}) do
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{lat, lon} = get_coordinates_from_mic_e(mic_e)
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{lat, lon, mic_e}
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end
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def get_coordinates(%{data_extended: %{latitude: lat, longitude: lon}} = packet) do
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{lat, lon, packet.data_extended}
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end
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def get_coordinates(packet) do
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lat = Map.get(packet, :lat) || Map.get(packet, "lat")
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lon = Map.get(packet, :lon) || Map.get(packet, "lon")
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data_extended = Map.get(packet, :data_extended) || Map.get(packet, "data_extended")
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{lat, lon, data_extended}
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end
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@spec get_coordinates_from_mic_e(MicE.t()) :: {number() | nil, number() | nil}
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def get_coordinates_from_mic_e(mic_e) do
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lat = mic_e.lat_degrees + mic_e.lat_minutes / 60.0 + mic_e.lat_fractional / 6000.0
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lat = if mic_e.lat_direction == :south, do: -lat, else: lat
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lon = mic_e.lon_degrees + mic_e.lon_minutes / 60.0 + mic_e.lon_fractional / 6000.0
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lon = if mic_e.lon_direction == :west, do: -lon, else: lon
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if lat >= -90 && lat <= 90 && lon >= -180 && lon <= 180, do: {lat, lon}, else: {nil, nil}
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end
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@spec has_position_data?(map()) :: boolean()
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def has_position_data?(packet) do
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lat = Map.get(packet, :lat) || Map.get(packet, "lat")
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lon = Map.get(packet, :lon) || Map.get(packet, "lon")
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if has_direct_coordinates?(lat, lon) do
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true
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else
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has_position_in_data_extended?(packet)
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end
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end
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defp has_direct_coordinates?(lat, lon) when not is_nil(lat) and not is_nil(lon), do: true
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defp has_direct_coordinates?(_, _), do: false
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defp has_position_in_data_extended?(packet) do
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data_extended = Map.get(packet, :data_extended) || Map.get(packet, "data_extended")
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has_position_in_data_extended_case?(data_extended)
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end
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defp has_position_in_data_extended_case?(%MicE{}), do: true
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defp has_position_in_data_extended_case?(%{latitude: lat, longitude: lon}) when not is_nil(lat) and not is_nil(lon),
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do: true
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defp has_position_in_data_extended_case?(_), do: false
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@spec within_bounds?(map() | tuple(), map()) :: boolean()
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def within_bounds?(packet_or_coords, bounds) do
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if is_nil(bounds) do
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false
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else
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{lat, lon} = extract_lat_lon(packet_or_coords)
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if is_nil(lat) or is_nil(lon) do
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false
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else
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check_bounds(lat, lon, bounds)
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end
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end
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end
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defp check_bounds(lat, lon, bounds) do
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lat = to_float(lat)
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lon = to_float(lon)
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south = to_float(bounds.south)
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north = to_float(bounds.north)
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west = to_float(bounds.west)
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east = to_float(bounds.east)
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lat_in_bounds = lat >= south && lat <= north
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lng_in_bounds = check_longitude_bounds(lon, west, east)
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lat_in_bounds && lng_in_bounds
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end
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defp check_longitude_bounds(lon, west, east) do
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if west <= east do
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lon >= west && lon <= east
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else
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lon >= west || lon <= east
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end
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end
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defp extract_lat_lon(%{lat: lat, lon: lon}), do: extract_lat_lon_atom(%{lat: lat, lon: lon})
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defp extract_lat_lon(%{"lat" => lat, "lon" => lon}), do: extract_lat_lon_string(%{"lat" => lat, "lon" => lon})
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defp extract_lat_lon(%{latitude: lat, longitude: lon}), do: extract_lat_lon_atom_alt(%{latitude: lat, longitude: lon})
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defp extract_lat_lon({lat, lon}) when is_number(lat) and is_number(lon), do: {lat, lon}
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defp extract_lat_lon(_), do: {nil, nil}
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defp extract_lat_lon_atom(packet), do: {packet.lat, packet.lon}
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defp extract_lat_lon_string(packet), do: {packet["lat"], packet["lon"]}
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defp extract_lat_lon_atom_alt(packet), do: {packet.latitude, packet.longitude}
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defp to_float(n) when is_float(n), do: n
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defp to_float(n) when is_integer(n), do: n * 1.0
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defp to_float(%Decimal{} = d), do: Decimal.to_float(d)
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defp to_float(n) when is_binary(n) do
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case Float.parse(n) do
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{f, _} -> f
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:error -> 0.0
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end
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end
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defp to_float(_), do: 0.0
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end
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