led_karte/get_coordinates.py

#!/usr/bin/python
import requests, json, pickle, os.path, svgwrite, math

URL = "https://directory.spaceapi.io/"
NORTHERNMOST = 55.05
EASTERNMOST = 15.033333
SOUTHERNMOST = 47.270108
WESTERNMOST = 5.866667
threshold = 0.10
YSPAN = NORTHERNMOST - SOUTHERNMOST
XSPAN = EASTERNMOST - WESTERNMOST
locations = {}
blacklist = ["Chaostreff Salzburg", "DevLoL", "CCC Basel", "Chaostreff Zürich",
        "ChaosStuff", "Level2", "Bastli", "Maakplek", "TkkrLab", "Hack42",
        "Hackerspace Nijmegen", "TDvenlo", "ACKspace"]

def dist(n1, n2):
    y = n1[0] - n2[0]
    x = n1[1] - n2[1]
    return math.sqrt(math.pow(x, 2) + math.pow(y, 2))

def conflict(targetlist, node):
    returner = None
    for element in targetlist:
        if dist(node, targetlist[element]) < threshold:
            returner = element
            continue
    return returner

def merge(n1, n2):
    lat = (n1[0] + n2[0]) / 2
    lon = (n1[1] + n2[1]) / 2
    returner = []
    returner.append(lat)
    returner.append(lon)
    return returner

if os.path.isfile('locations.bin'):
    print ("using offline data...")
    with open("locations.bin", "rb") as f:
        locations = pickle.load(f)
else:
    print ("offline data not available, downloading...,")
    r = requests.get(url = URL)
    data = r.json()
    for space in data:
        spacerequest = None
        try:
            spacerequest = requests.get(url = data[space], timeout=1)
        except requests.exceptions.RequestException as e:  # This is the correct syntax
            continue
        try:
            spacedata = spacerequest.json()
        except json.JSONDecodeError as jde:
            continue
        if "location" in spacedata:
            if "lat" in spacedata["location"]:
                lat = spacedata["location"]["lat"]
                lon = spacedata["location"]["lon"]
                locations[space] = [float(lat), float(lon)]

    for space in locations:
        print (space + " " +  str(locations[space]))
    with open("locations.bin", "wb") as f:
        pickle.dump(locations, f, pickle.HIGHEST_PROTOCOL)
print ("Removing non-german points...")
german_locations = locations.copy()
for space in locations:
    if locations[space][0] > NORTHERNMOST:
        del german_locations[space]
    elif locations[space][0] < SOUTHERNMOST:
        del german_locations[space]
    elif locations[space][1] < WESTERNMOST:
        del german_locations[space]
    elif locations[space][1] > EASTERNMOST:
        del german_locations[space]

for space in blacklist:
    del german_locations[space]


finallist = {}
while german_locations:
    n1 = next(iter(german_locations))
    conflictnode = conflict(finallist, german_locations[n1])
    if conflictnode == None:
        finallist.update({n1 : german_locations[n1]})
        del german_locations[n1]
    else:
        mergenode = merge(german_locations[n1], finallist[conflictnode])
        del german_locations[n1]
        del finallist[conflictnode]
        german_locations.update({"MERGED: " + n1 + " " + conflictnode : mergenode})

for space in finallist:
    #print(space + " " + str(finallist[space][0]) + " " + str(finallist[space][1]))
    print(str(finallist[space][0]) + " " + str(finallist[space][1]) + " {" +
            space + "}")

dwg = svgwrite.Drawing('svgwrite-example.svg', profile='tiny')
dwg.add(svgwrite.image.Image(href="Karte_Deutschland.svg", size=(586, 793)))
dwg.add(dwg.circle(center=(0,0), r=3, fill='black'))
for space in finallist:
    ypoint = (793 - (((finallist[space][0] - SOUTHERNMOST) / YSPAN)* 793))
    xpoint = ((finallist[space][1] - WESTERNMOST) / XSPAN) * 586
    dwg.add(dwg.circle(center=(xpoint, ypoint), r=5, fill='green'))
dwg.save()