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convert GridCog to use gridtools (#326)

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* deprecated ?ungrid
* added more help text to commands
* separated distance into its own command

fixes #306
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classabbyamp 2020-12-22 20:40:24 -05:00 committed by GitHub
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3 changed files with 42 additions and 112 deletions
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4
CHANGELOG.md
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@ -7,6 +7,10 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
## [Unreleased]
### Changed
- New colour theme for `?greyline`.
- Moved great circle distance and bearing calculation from `?ungrid` to `?griddistance`.
- `?ungrid` to `?latlong`.
### Deprecated
- `?ungrid`.
## [2.5.1] - 2020-12-10

149
exts/grid.py
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@ -8,7 +8,7 @@ the GNU General Public License, version 2.
"""
import math
import gridtools
import discord.ext.commands as commands
@ -20,124 +20,49 @@ class GridCog(commands.Cog):
self.bot = bot
@commands.command(name="grid", category=cmn.cat.maps)
async def _grid_sq_lookup(self, ctx: commands.Context, lat: str, lon: str):
("""Calculates the grid square for latitude and longitude coordinates, """
"""with negative being latitude South and longitude West.""")
grid = "**"
latf = float(lat) + 90
lonf = float(lon) + 180
if 0 <= latf <= 180 and 0 <= lonf <= 360:
grid += chr(ord("A") + int(lonf / 20))
grid += chr(ord("A") + int(latf / 10))
grid += chr(ord("0") + int((lonf % 20)/2))
grid += chr(ord("0") + int((latf % 10)/1))
grid += chr(ord("a") + int((lonf - (int(lonf/2)*2)) / (5/60)))
grid += chr(ord("a") + int((latf - (int(latf/1)*1)) / (2.5/60)))
grid += "**"
embed = cmn.embed_factory(ctx)
embed.title = f"Maidenhead Grid Locator for {float(lat):.6f}, {float(lon):.6f}"
embed.description = grid
embed.colour = cmn.colours.good
else:
embed = cmn.embed_factory(ctx)
embed.title = f"Error generating grid square for {lat}, {lon}."
embed.description = """Coordinates out of range.
The valid ranges are:
- Latitude: `-90` to `+90`
- Longitude: `-180` to `+180`"""
embed.colour = cmn.colours.bad
async def _grid_sq_lookup(self, ctx: commands.Context, lat: float, lon: float):
("""Calculates the grid square for latitude and longitude coordinates."""
"""\n\nCoordinates should be in decimal format, with negative being latitude South and longitude West."""
"""\n\nTo calculate the latitude and longitude from a grid locator, use `latlong`""")
latlong = gridtools.LatLong(lat, lon)
grid = gridtools.Grid(latlong)
embed = cmn.embed_factory(ctx)
embed.title = f"Maidenhead Grid Locator for {latlong.lat:.5f}, {latlong.long:.5f}"
embed.description = f"**{grid}**"
embed.colour = cmn.colours.good
await ctx.send(embed=embed)
@commands.command(name="ungrid", aliases=["loc"], category=cmn.cat.maps)
async def _location_lookup(self, ctx: commands.Context, grid: str, grid2: str = None):
"""Calculates the latitude and longitude for the center of a grid square.
If two grid squares are given, the distance and azimuth between them is calculated."""
if grid2 is None or grid2 == "":
try:
grid = grid.upper()
loc = get_coords(grid)
@commands.command(name="latlong", aliases=["latlon", "loc", "ungrid"], category=cmn.cat.maps)
async def _location_lookup(self, ctx: commands.Context, grid: str):
("""Calculates the latitude and longitude for the center of a grid locator."""
"""\n\nTo calculate the grid locator from a latitude and longitude, use `grid`"""
"""\n\n*Warning: `ungrid` will be removed soon. Use one of the other names for this command.*""")
grid_obj = gridtools.Grid(grid)
embed = cmn.embed_factory(ctx)
embed.title = f"Latitude and Longitude for {grid}"
embed.colour = cmn.colours.good
if len(grid) >= 6:
embed.description = f"**{loc[0]:.5f}, {loc[1]:.5f}**"
embed.url = f"https://www.openstreetmap.org/#map=13/{loc[0]:.5f}/{loc[1]:.5f}"
else:
embed.description = f"**{loc[0]:.1f}, {loc[1]:.1f}**"
embed.url = f"https://www.openstreetmap.org/#map=10/{loc[0]:.1f}/{loc[1]:.1f}"
except Exception as e:
embed = cmn.embed_factory(ctx)
embed.title = f"Error generating latitude and longitude for grid {grid}."
embed.description = str(e)
embed.colour = cmn.colours.bad
else:
radius = 6371
try:
grid = grid.upper()
grid2 = grid2.upper()
loc = get_coords(grid)
loc2 = get_coords(grid2)
# Haversine formula
d_lat = math.radians(loc2[0] - loc[0])
d_lon = math.radians(loc2[1] - loc[1])
a = (math.sin(d_lat/2) ** 2
+ math.cos(math.radians(loc[0]))
* math.cos(math.radians(loc2[0]))
* math.sin(d_lon/2) ** 2)
c = 2 * math.atan2(math.sqrt(a), math.sqrt(1-a))
d = radius * c
d_mi = 0.6213712 * d
# Bearing
y_dist = math.sin(math.radians(loc2[1]-loc[1])) * math.cos(math.radians(loc2[0]))
x_dist = (math.cos(math.radians(loc[0]))
* math.sin(math.radians(loc2[0]))
- math.sin(math.radians(loc[0]))
* math.cos(math.radians(loc2[0]))
* math.cos(math.radians(loc2[1] - loc[1])))
bearing = (math.degrees(math.atan2(y_dist, x_dist)) + 360) % 360
embed = cmn.embed_factory(ctx)
embed.title = f"Great Circle Distance and Bearing from {grid} to {grid2}"
embed.description = f"**Distance:** {d:.1f} km ({d_mi:.1f} mi)\n**Bearing:** {bearing:.1f}°"
embed.colour = cmn.colours.good
except Exception as e:
embed = cmn.embed_factory(ctx)
embed.title = f"Error generating great circle distance and bearing from {grid} and {grid2}."
embed.description = str(e)
embed.colour = cmn.colours.bad
embed = cmn.embed_factory(ctx)
embed.title = f"Latitude and Longitude for {grid_obj}"
embed.colour = cmn.colours.good
embed.description = f"**{grid_obj.lat:.5f}, {grid_obj.long:.5f}**"
if ctx.invoked_with == "ungrid":
embed.add_field(name="Warning", value=(f"*`{ctx.prefix}ungrid` will be removed soon, use `{ctx.prefix}help "
"latlong` to see other names for this command.*"))
await ctx.send(embed=embed)
@commands.command(name="griddistance", aliases=["griddist", "distance", "dist"], category=cmn.cat.maps)
async def _dist_lookup(self, ctx: commands.Context, grid1: str, grid2: str):
"""Calculates the great circle distance and azimuthal bearing between two grid locators."""
g1 = gridtools.Grid(grid1)
g2 = gridtools.Grid(grid2)
def get_coords(grid: str):
if len(grid) < 3:
raise ValueError("The grid locator must be at least 4 characters long.")
dist, bearing = gridtools.grid_distance(g1, g2)
dist_mi = 0.6214 * dist
if not grid[0:2].isalpha() or not grid[2:4].isdigit():
if len(grid) <= 4:
raise ValueError("The grid locator must be of the form AA##.")
if len(grid) >= 6 and not grid[5:7].isalpha():
raise ValueError("The grid locator must be of the form AA##AA.")
lon = ((ord(grid[0]) - ord("A")) * 20) - 180
lat = ((ord(grid[1]) - ord("A")) * 10) - 90
lon += ((ord(grid[2]) - ord("0")) * 2)
lat += ((ord(grid[3]) - ord("0")) * 1)
if len(grid) >= 6:
# have subsquares
lon += ((ord(grid[4])) - ord("A")) * (5/60)
lat += ((ord(grid[5])) - ord("A")) * (2.5/60)
# move to center of subsquare
lon += (2.5/60)
lat += (1.25/60)
return (lat, lon)
# move to center of square
lon += 1
lat += 0.5
return (lat, lon)
embed = cmn.embed_factory(ctx)
embed.title = f"Great Circle Distance and Bearing from {g1} to {g2}"
embed.description = f"**Distance:** {dist:.1f} km ({dist_mi:.1f} mi)\n**Bearing:** {bearing:.1f}°"
embed.colour = cmn.colours.good
await ctx.send(embed=embed)
def setup(bot: commands.Bot):

1
requirements.txt
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@ -1,5 +1,6 @@
discord.py~=1.5.0
ctyparser~=2.0
gridtools~=1.0
beautifulsoup4
lxml
pytz