Create imagemap, download ALL chaostreffs, variate distance in label placement

.gitignore

@@ -1,3 +1,2 @@
 cache/
-map.png
-map.svg
+out/

generate_map.py

@@ -11,6 +11,7 @@ import sys
 import argparse
 import shutil
 import random
+import math
 
 from lxml import etree
 import pyproj
@@ -37,9 +38,25 @@ class CachePaths:
         self.chaostreff_info = os.path.join(path, 'chaostreff-info.json')
 
 
-ERFA_URL = 'https://doku.ccc.de/Spezial:Semantische_Suche/format%3Djson/limit%3D50/link%3Dall/headers%3Dshow/searchlabel%3DJSON/class%3Dsortable-20wikitable-20smwtable/sort%3D/order%3Dasc/offset%3D0/-5B-5BKategorie:Erfa-2DKreise-5D-5D-20-5B-5BChaostreff-2DActive::wahr-5D-5D/-3FChaostreff-2DCity/-3FChaostreff-2DPhysical-2DAddress/-3FChaostreff-2DPhysical-2DHousenumber/-3FChaostreff-2DPhysical-2DPostcode/-3FChaostreff-2DPhysical-2DCity/-3FChaostreff-2DCountry/-3FPublic-2DWeb/-3FChaostreff-2DLongname/mainlabel%3D/prettyprint%3Dtrue/unescape%3Dtrue'
+class OutputPaths:
 
-CHAOSTREFF_URL = 'https://doku.ccc.de/Spezial:Semantische_Suche/format%3Djson/limit%3D50/link%3Dall/headers%3Dshow/searchlabel%3DJSON/class%3Dsortable-20wikitable-20smwtable/sort%3D/order%3Dasc/offset%3D0/-5B-5BKategorie:Chaostreffs-5D-5D-20-5B-5BChaostreff-2DActive::wahr-5D-5D/-3FChaostreff-2DCity/-3FChaostreff-2DPhysical-2DAddress/-3FChaostreff-2DPhysical-2DHousenumber/-3FChaostreff-2DPhysical-2DPostcode/-3FChaostreff-2DPhysical-2DCity/-3FChaostreff-2DCountry/-3FPublic-2DWeb/-3FChaostreff-2DLongname/mainlabel%3D/prettyprint%3Dtrue/unescape%3Dtrue'
+    def __init__(self, path: str):
+        if os.path.exists(path) and not os.path.isdir(path):
+            raise AttributeError(f'Path exists but is not a directory: {path}')
+        os.makedirs(path, exist_ok=True)
+        self.path = path
+        self.svg_path = os.path.join(path, 'map.svg')
+        self.png_path = os.path.join(path, 'map.png')
+        self.html_path = os.path.join(path, 'erfamap.html')
+        self.imagemap_path = os.path.join(path, 'imagemap.html')
+
+    def rel(self, path: str):
+        return os.path.relpath(path, start=self.path)
+
+
+ERFA_URL = 'https://doku.ccc.de/index.php?title=Spezial:Semantische_Suche&x=-5B-5BKategorie%3AErfa-2DKreise-5D-5D-20-5B-5BChaostreff-2DActive%3A%3Awahr-5D-5D%2F-3FChaostreff-2DCity%2F-3FChaostreff-2DPhysical-2DAddress%2F-3FChaostreff-2DPhysical-2DHousenumber%2F-3FChaostreff-2DPhysical-2DPostcode%2F-3FChaostreff-2DPhysical-2DCity%2F-3FChaostreff-2DCountry%2F-3FPublic-2DWeb%2F-3FChaostreff-2DLongname%2F-3FChaostreff-2DNickname%2F-3FChaostreff-2DRealname&format=json&limit=200&link=all&headers=show&searchlabel=JSON&class=sortable+wikitable+smwtable&sort=&order=asc&offset=0&mainlabel=&prettyprint=true&unescape=true'
+
+CHAOSTREFF_URL = 'https://doku.ccc.de/index.php?title=Spezial:Semantische_Suche&x=-5B-5BKategorie%3AChaostreffs-5D-5D-20-5B-5BChaostreff-2DActive%3A%3Awahr-5D-5D%2F-3FChaostreff-2DCity%2F-3FChaostreff-2DPhysical-2DAddress%2F-3FChaostreff-2DPhysical-2DHousenumber%2F-3FChaostreff-2DPhysical-2DPostcode%2F-3FChaostreff-2DPhysical-2DCity%2F-3FChaostreff-2DCountry%2F-3FPublic-2DWeb%2F-3FChaostreff-2DLongname%2F-3FChaostreff-2DNickname%2F-3FChaostreff-2DRealname&format=json&limit=200&link=all&headers=show&searchlabel=JSON&class=sortable+wikitable+smwtable&sort=&order=asc&offset=0&mainlabel=&prettyprint=true&unescape=true'
 
 
 def sparql_query(query):
@@ -167,6 +184,7 @@ def address_lookup(name, erfa):
     city = erfa['Chaostreff-City'][0]
     country = erfa['Chaostreff-Country'][0]
 
+    # Try the most accurate address first, try increasingly inaccurate addresses on failure.
     formats = [
         # Muttenz, Schweiz
         f'{city}, {country}'
@@ -210,6 +228,13 @@ def fetch_erfas(target, url):
             erfas[city]['web'] = erfa['printouts']['Public-Web'][0]
         if len(erfa['printouts']['Chaostreff-Longname']) > 0:
             erfas[city]['name'] = erfa['printouts']['Chaostreff-Longname'][0]
+        elif len(erfa['printouts']['Chaostreff-Nickname']) > 0:
+            erfas[city]['name'] = erfa['printouts']['Chaostreff-Nickname'][0]
+        elif len(erfa['printouts']['Chaostreff-Realname']) > 0:
+            erfas[city]['name'] = erfa['printouts']['Chaostreff-Realname'][0]
+        else:
+            erfas[city]['name'] = name
+            
         
     with open(target, 'w') as f:
         json.dump(erfas, f)
@@ -257,6 +282,8 @@ class BoundingBox:
         self.meta = meta
         self.base_weight = base_weight
         self.finished = False
+        self._weight = 0
+        self._optimal = True
 
     def __contains__(self, other):
         if isinstance(other, BoundingBox):
@@ -323,7 +350,7 @@ class BoundingBox:
     def distance2(self, other):
         c1 = self.center
         c2 = other.center
-        return (c1[0] - c2[0])**2 + (c1[1] - c2[1])**2
+        return math.sqrt((c1[0] - c2[0])**2 + (c1[1] - c2[1])**2)
 
     def with_margin(self, margin):
         return BoundingBox(self.left - margin, self.top - margin,
@@ -331,6 +358,7 @@ class BoundingBox:
                            width=None, height=None, meta=self.meta, base_weight=self.base_weight)
 
     def chebyshev_distance(self, other):
+        # https://en.wikipedia.org/wiki/Chebyshev_distance
         if other in self:
             return 0
         if isinstance(other, BoundingBox):
@@ -358,22 +386,27 @@ class BoundingBox:
 
     def compute_weight(self, other, erfas, chaostreffs, pdist, ns):
         w = 0
+        self._optimal = True
         swm = self.with_margin(pdist)
         swe = self.with_margin(ns.dotsize_erfa)
         swc = self.with_margin(ns.dotsize_treff)
         swme = swm.with_margin(ns.dotsize_erfa)
         swmc = swm.with_margin(ns.dotsize_treff)
         # I hope these weights are somewhat reasonably balanced...
+        # Basically the weights correspond to geometrical distances,
+        # except for an actual collision, which gets a huge extra weight.
         for o in other:
             if o.meta['city'] == self.meta['city']:
                 continue
             if o in self:
                 if o.finished:
                     w += 1000
+                    self._optimal = False
                 else:
                     w += 50
+                    self._optimal = False
             else:
-                w += max(pdist*2 - swc.chebyshev_distance(o), 0)
+                w += max(pdist*2 - swm.chebyshev_distance(o), 0)
                 continue
             if o in swm:
                 if o.finished:
@@ -385,6 +418,7 @@ class BoundingBox:
                 continue
             if location in swe:
                 w += 1000
+                self._optimal = False
             else:
                 w += max(pdist*2 - swe.chebyshev_distance(location), 0)
         for city, location in chaostreffs.items():
@@ -392,6 +426,7 @@ class BoundingBox:
                 continue
             if location in swc:
                 w += 1000
+                self._optimal = False
             else:
                 w += max(pdist*2 - swc.chebyshev_distance(location), 0)
         self._weight = w
@@ -402,19 +437,23 @@ class BoundingBox:
 
     @property
     def is_optimal(self):
-        return self._weight == 0
+        # Candidate is considered optimal if it doesn't collide with anything else
+        return self._optimal
 
     def __str__(self):
         return f'(({int(self.left)}, {int(self.top)}, {int(self.right)}, {int(self.bottom)}), weight={self.weight})'
 
 
 def optimize_text_layout(ns, erfas, chaostreffs, size, svg):
+
+    # Load the font and measure its various different heights
     font = ImageFont.truetype(ns.font, ns.font_size)
     pil = ImageDraw(Image.new('P', (1, 1)))
     xheight = -pil.textbbox((0,0), 'x', font=font, anchor='ls')[1]
     capheight = -pil.textbbox((0,0), 'A', font=font, anchor='ls')[1]
     voffset = -capheight / 2
 
+    # Generate a discrete set of text placement candidates around each erfa dot
     candidates = {}
     for city, location in erfas.items():
         text = city
@@ -427,29 +466,35 @@ def optimize_text_layout(ns, erfas, chaostreffs, size, svg):
         meta = {'city': city, 'text': text, 'baseline': capheight}
         textbox = pil.textbbox((0, 0), text, font=font, anchor='ls')  # left, baseline at 0,0
         mw, mh = textbox[2] - textbox[0], textbox[3] - textbox[1]
-        rbox = BoundingBox(erfax + ns.font_distance, erfay + voffset, width=mw, height=mh, meta=meta)
-        lbox = BoundingBox(erfax - ns.font_distance - mw, erfay + voffset, width=mw, height=mh, meta=meta)
-        if erfax > 0.8 * size[0]:
-            rbox.base_weight += 0.001
-        else:
-            lbox.base_weight += 0.001
-        candidates[city] = [lbox, rbox]
-        for i in range(-2, 3):
-            if i == 0:
-                continue
-            candidates[city].append(lbox + (0, ns.dotsize_erfa*i))
-            candidates[city].append(rbox + (0, ns.dotsize_erfa*i))
-        candidates[city].extend([
-            BoundingBox(erfax - mw/2, erfay - ns.font_distance - mh, width=mw, height=mh, meta=meta, base_weight=0.001),
-            BoundingBox(erfax - mw/2, erfay + ns.font_distance, width=mw, height=mh, meta=meta, base_weight=0.001),
-            BoundingBox(erfax - ns.dotsize_erfa, erfay - ns.font_distance - mh, width=mw, height=mh, meta=meta, base_weight=0.002),
-            BoundingBox(erfax - ns.dotsize_erfa, erfay + ns.font_distance, width=mw, height=mh, meta=meta, base_weight=0.003),
-            BoundingBox(erfax + ns.dotsize_erfa - mw, erfay - ns.font_distance - mh, width=mw, height=mh, meta=meta, base_weight=0.001),
-            BoundingBox(erfax + ns.dotsize_erfa - mw, erfay + ns.font_distance, width=mw, height=mh, meta=meta, base_weight=0.001),
-        ])
-        rbox.base_weight -= 0.003
-        lbox.base_weight -= 0.003
+        candidates[city] = []
 
+        # Iterate over the dot-to-text distance range in discrete steps
+        it = max(0, ns.font_step_distance)
+        for j in range(it+1):
+            dist = ns.font_min_distance + (ns.font_max_distance - ns.font_min_distance) * j / it
+            bw = dist
+            # Generate 5 candidates each left and right of the dot, with varying vertical offset
+            for i in range(-1, 2):
+                if i == 0:
+                    bw -= 0.003
+                bwl, bwr = bw, bw
+                if erfax > 0.8 * size[0]:
+                    bwr = bw + 0.001
+                else:
+                    bwl = bw + 0.001
+                candidates[city].append(BoundingBox(erfax - dist - mw, erfay + voffset + ns.dotsize_erfa*i*2, width=mw, height=mh, meta=meta, base_weight=bwl))
+                candidates[city].append(BoundingBox(erfax + dist, erfay + voffset + ns.dotsize_erfa*i*2, width=mw, height=mh, meta=meta, base_weight=bwr))
+            # Generate 3 candidates each above and beneath the dot, aligned left, centered and right
+            candidates[city].extend([
+                BoundingBox(erfax - mw/2, erfay - dist - mh, width=mw, height=mh, meta=meta, base_weight=bw + 0.001),
+                BoundingBox(erfax - mw/2, erfay + dist, width=mw, height=mh, meta=meta, base_weight=bw + 0.001),
+                BoundingBox(erfax - ns.dotsize_erfa, erfay - dist - mh, width=mw, height=mh, meta=meta, base_weight=bw + 0.002),
+                BoundingBox(erfax - ns.dotsize_erfa, erfay + dist, width=mw, height=mh, meta=meta, base_weight=bw + 0.003),
+                BoundingBox(erfax + ns.dotsize_erfa - mw, erfay - dist - mh, width=mw, height=mh, meta=meta, base_weight=bw + 0.001),
+                BoundingBox(erfax + ns.dotsize_erfa - mw, erfay + dist, width=mw, height=mh, meta=meta, base_weight=bw + 0.001),
+            ])
+
+        # If debugging is enabled, render one rectangle around each label's bounding box, and one rectangle around each label's median box
         if ns.debug:
             for c in candidates[city]:
                 di = etree.Element('rect', x=str(c.left), y=str(c.top + capheight - xheight), width=str(c.width), height=str(xheight))
@@ -463,6 +508,7 @@ def optimize_text_layout(ns, erfas, chaostreffs, size, svg):
     unfinished = {c for c in erfas.keys()}
     finished = {}
 
+    # Greedily choose a candidate for each label
     with tqdm.tqdm(total=len(erfas)) as progress:
         while len(unfinished) > 0:
             progress.update(len(erfas) - len(unfinished))
@@ -473,7 +519,7 @@ def optimize_text_layout(ns, erfas, chaostreffs, size, svg):
                 all_boxes.update(candidates[city])
                 unfinished_boxes.update(candidates[city])
             for box in all_boxes:
-                box.compute_weight(all_boxes, erfas, chaostreffs, pdist=max(ns.font_distance, xheight), ns=ns)
+                box.compute_weight(all_boxes, erfas, chaostreffs, pdist=max(ns.font_min_distance, xheight), ns=ns)
             
             # Get candidate with the least number of optimal solutions > 0
             optcity = min(unfinished, key=lambda city: len([1 for box in candidates[city] if box.is_optimal]) or float('inf'))
@@ -499,7 +545,7 @@ def optimize_text_layout(ns, erfas, chaostreffs, size, svg):
         for city in order:
             all_boxes = set(finished.values())
             for box in candidates[city]:
-                box.compute_weight(all_boxes, erfas, chaostreffs, pdist=max(ns.font_distance, xheight), ns=ns)
+                box.compute_weight(all_boxes, erfas, chaostreffs, pdist=max(ns.font_min_distance, xheight), ns=ns)
             minbox = min(candidates[city], key=lambda box: box.weight)
             if minbox is not finished[city]:
                 changed = True
@@ -512,6 +558,48 @@ def optimize_text_layout(ns, erfas, chaostreffs, size, svg):
     return finished
 
 
+def create_imagemap(ns, size, parent,
+                    erfas, erfa_urls, erfa_names, texts,
+                    chaostreffs, chaostreff_urls, chaostreff_names):
+    img = etree.Element('img',
+                        src=ns.output_directory.rel(ns.output_directory.png_path),
+                        usemap='#erfamap',
+                        width=str(size[0]), height=str(size[1]))
+    imgmap = etree.Element('map', name='erfamap')
+
+    for city, location in erfas.items():
+        if city not in erfa_urls:
+            continue
+        box = texts[city]
+        area = etree.Element('area',
+                             shape='circle',
+                             coords=f'{location[0]},{location[1]},{ns.dotsize_erfa}',
+                             href=erfa_urls[city])
+        area2 = etree.Element('area',
+                             shape='rect',
+                             coords=f'{box.left},{box.top},{box.right},{box.bottom}',
+                             href=erfa_urls[city])
+        if city in erfa_names:
+            area.set('title', erfa_names[city])
+            area2.set('title', erfa_names[city])
+        imgmap.append(area)
+        imgmap.append(area2)
+
+    for city, location in chaostreffs.items():
+        if city not in chaostreff_urls:
+            continue
+        area = etree.Element('area',
+                             shape='circle',
+                             coords=f'{location[0]},{location[1]},{ns.dotsize_treff}',
+                             href=chaostreff_urls[city])
+        if city in chaostreff_names:
+            area.set('title', chaostreff_names[city])
+        imgmap.append(area)
+
+    parent.append(img)
+    parent.append(imgmap)
+
+
 def create_svg(ns, bbox):
     print('Creating SVG image')
 
@@ -528,6 +616,7 @@ def create_svg(ns, bbox):
     origin = trans_bounding_box[0]
     svg_box = (trans_bounding_box[1][0] - origin[0], origin[1] - trans_bounding_box[1][1])
 
+    # Load state border lines from cached JSON files
     shapes_states = []
     files = os.listdir(ns.cache_directory.shapes_states)
     for f in files:
@@ -548,6 +637,7 @@ def create_svg(ns, bbox):
                 ts.append((xt*scalex - origin[0], origin[1] - yt*scaley))
             shapes_states.append((name, ts))
 
+    # Load country border lines from cached JSON files
     shapes_countries = []
     files = os.listdir(ns.cache_directory.shapes_filtered)
     for f in files:
@@ -568,6 +658,7 @@ def create_svg(ns, bbox):
                 ts.append((xt*scalex - origin[0], origin[1] - yt*scaley))
             shapes_countries.append((name, ts))
 
+    # Load Erfa infos from cached JSON files
     erfas = {}
     erfa_urls = {}
     erfa_names = {}
@@ -586,6 +677,7 @@ def create_svg(ns, bbox):
         if name is not None:
             erfa_names[city] = name
 
+    # Load Chaostreff infos from cached JSON files
     chaostreffs = {}
     chaostreff_urls = {}
     chaostreff_names = {}
@@ -617,20 +709,22 @@ def create_svg(ns, bbox):
             rectbox[2] = max(lon, rectbox[2])
             rectbox[3] = max(lat, rectbox[3])
 
+    print('Copying stylesheet and font')
+    dst = os.path.join(ns.output_directory.path, ns.stylesheet)
+    os.makedirs(os.path.dirname(dst), exist_ok=True)
+    shutil.copyfile(ns.stylesheet, dst)
+    dst = os.path.join(ns.output_directory.path, ns.font)
+    os.makedirs(os.path.dirname(dst), exist_ok=True)
+    shutil.copyfile(ns.font, dst)
 
     svg = etree.Element('svg',
                         xmlns='http://www.w3.org/2000/svg',
                         viewBox=f'0 0 {svg_box[0]} {svg_box[1]}',
                         width=str(svg_box[0]), height=str(svg_box[1]))
 
-    print('Layouting labels')
-    texts = optimize_text_layout(ns, erfas, chaostreffs, (int(svg_box[0]), int(svg_box[1])), svg)
-
-    defs = etree.Element('defs')
     style = etree.Element('style', type='text/css')
     style.text = f'@import url({ns.stylesheet})'
-    defs.append(style)
-    svg.append(defs)
+    svg.append(style)
     
     bg = etree.Element('rect',
                        id='background',
@@ -641,6 +735,7 @@ def create_svg(ns, bbox):
     bg.set('class', 'background')
     svg.append(bg)
 
+    # Render country borders
     for name, shape in shapes_countries:
         points = ' '.join([f'{lon},{lat}' for lon, lat in shape])
         poly = etree.Element('polygon', points=points)
@@ -648,6 +743,7 @@ def create_svg(ns, bbox):
         poly.set('data-country', name)
         svg.append(poly)
 
+    # Render state borders
     # Render shortest shapes last s.t. Berlin, Hamburg and Bremen are rendered on top of their surrounding states
     for name, shape in sorted(shapes_states, key=lambda x: -sum(len(s) for s in x[1])):
         points = ' '.join([f'{lon},{lat}' for lon, lat in shape])
@@ -656,6 +752,11 @@ def create_svg(ns, bbox):
         poly.set('data-state', name)
         svg.append(poly)
 
+    # This can take some time, especially if lots of candidates are generated
+    print('Layouting labels')
+    texts = optimize_text_layout(ns, erfas, chaostreffs, (int(svg_box[0]), int(svg_box[1])), svg)
+
+    # Render Erfa dots and their labels
     for city, location in erfas.items():
         box = texts[city]
         if city in erfa_urls:
@@ -678,6 +779,7 @@ def create_svg(ns, bbox):
         group.append(text)
         svg.append(group)
 
+    # Render Chaostreff dots
     for city, location in chaostreffs.items():
         circle = etree.Element('circle', cx=str(location[0]), cy=str(location[1]), r=str(ns.dotsize_treff))
         circle.set('class', 'chaostreff')
@@ -687,25 +789,59 @@ def create_svg(ns, bbox):
             title.text = chaostreff_names[city]
             circle.append(title)
         if city in chaostreff_urls:
-            a = etree.Element('a', href=chaostreff_urls[city], target='_blank', title='foox')
+            a = etree.Element('a', href=chaostreff_urls[city], target='_blank')
             a.append(circle)
             svg.append(a)
         else:
             svg.append(circle)
 
-    print('Done, writing SVG')
-    with open('map.svg', 'wb') as mapfile:
+    # Generate SVG, PNG and HTML output files
+
+    print('Writing SVG')
+    with open(ns.output_directory.svg_path, 'wb') as mapfile:
         root = etree.ElementTree(svg)
         root.write(mapfile)
 
-    print('Done, writing PNG')
-    cairosvg.svg2png(url='map.svg', write_to='map.png')
-    print('Done')
+    print('Writing PNG')
+    cairosvg.svg2png(url=ns.output_directory.svg_path, write_to=ns.output_directory.png_path)
+
+    print('Writing HTML SVG page')
+    html = etree.Element('html')
+    head = etree.Element('head')
+    link = etree.Element('link', rel='stylesheet', href=ns.stylesheet)
+    head.append(link)
+    html.append(head)
+    body = etree.Element('body')
+    obj = etree.Element('object',
+                        data=ns.output_directory.rel(ns.output_directory.svg_path),
+                        width=str(svg_box[0]), height=str(svg_box[1]))
+    create_imagemap(ns, svg_box, obj,
+                    erfas, erfa_urls, erfa_names, texts,
+                    chaostreffs, chaostreff_urls, chaostreff_names)
+    body.append(obj)
+    html.append(body)
+    with open(ns.output_directory.html_path, 'wb') as f:
+        f.write(b'<!DOCTYLE html>\n')
+        etree.ElementTree(html).write(f)
+
+    print('Writing HTML Image Map')
+    html = etree.Element('html')
+    body = etree.Element('body')
+    html.append(body)
+
+    create_imagemap(ns, svg_box, body,
+                    erfas, erfa_urls, erfa_names, texts,
+                    chaostreffs, chaostreff_urls, chaostreff_names)
+
+    with open(ns.output_directory.imagemap_path, 'wb') as f:
+        f.write(b'<!DOCTYLE html>\n')
+        etree.ElementTree(html).write(f)
 
 
 def main():
     ap = argparse.ArgumentParser(sys.argv[0])
     ap.add_argument('--cache-directory', type=CachePaths, default='cache', help='Path to the cache directory')
+    ap.add_argument('--output-directory', type=OutputPaths, default='out', help='Path to the output directory')
     ap.add_argument('--update-borders', action='store_true', default=False, help='Update country borders from Wikidata')
     ap.add_argument('--update-erfalist', action='store_true', default=False, help='Update Erfa/Chaostreff list from doku.ccc.de')
     ap.add_argument('--bbox', type=float, nargs=4, metavar=('LON', 'LAT', 'LON', 'LAT') ,default=None, help='Override map bounding box')
@@ -713,7 +849,9 @@ def main():
     ap.add_argument('--stylesheet', type=str, default='style/erfamap.css', help='Stylesheet for the generated SVG')
     ap.add_argument('--font', type=str, default='style/concertone-regular.ttf', help='Name of the font used in the stylesheet.')
     ap.add_argument('--font-size', type=int, default=45, help='Size of the font used in the stylesheet.')
-    ap.add_argument('--font-distance', type=int, default=18, help='Distance of labels from their dots center')
+    ap.add_argument('--font-min-distance', type=int, default=18, help='Minimal distance of labels from their dots center')
+    ap.add_argument('--font-max-distance', type=int, default=40, help='Maximal distance of labels from their dots center')
+    ap.add_argument('--font-step-distance', type=int, default=3, help='Distance steps of labels from their dots center')
     ap.add_argument('--dotsize-erfa', type=float, default=13, help='Radius of Erfa dots')
     ap.add_argument('--dotsize-treff', type=float, default=8, help='Radius of Chaostreff dots')
     ap.add_argument('--rename', type=str, action='append', nargs=2, metavar=('FROM', 'TO'), default=[], help='Rename a city with an overly long name (e.g. "Rothenburg ob der Tauber" to "Rothenburg")')

style/erfamap.css

@@ -1,4 +1,11 @@
+* {
+    margin: 0;
+    padding: 0;
+}
 
+object, img {
+    max-width: 100%;
+}
 
 
 rect.background {