Pare down city fields; add more cities

lib/xmet/city.py

@@ -2,20 +2,13 @@ import csv
 import shapely
 
 """
-Implements a parser and wrapper class for the top 150 populous US cities
-available on Wikipedia:
-
-    https://en.wikipedia.org/wiki/List_of_United_States_cities_by_population
-
-The input TSV file is created by copying and pasting the tabular data
-from a web browser into a text file.
+Implements a parser and wrapper class for a TSV list of cities.
 """
 
 class City():
     name:       str
     state:      str
-    pop_estimate: int
-    pop_census:   int
+    population: int
     location:   shapely.Point
 
     @staticmethod
@@ -23,9 +16,8 @@ class City():
         city = City()
         city.name       = row[0]
         city.state      = row[1]
-        city.pop_estimate = int(row[2])
-        city.pop_census   = int(row[3])
-        city.location     = shapely.Point(float(row[10]), float(row[9]))
+        city.population = int(row[2])
+        city.location   = shapely.Point(float(row[4]), float(row[3]))
 
         return city
 

lib/xmet/map.py

@@ -1,7 +1,10 @@
+import math
 import cairo
 import shapely
 import gi
 
+from xmet.city import City
+
 gi.require_version('Rsvg', '2.0')
 
 from gi.repository import Rsvg
@@ -74,3 +77,34 @@ class EquirectMap():
                 first = False
             else:
                 cr.line_to(x, y)
+
+    def draw_city(self, cr: cairo.Context, city: City):
+        cr.save()
+
+        x, y = self.map_to_screen(city.location)
+
+        if city.population >= 1000000:
+            radius = 4
+            pass
+        elif city.population >= 500000:
+            radius = 3
+            pass
+        elif city.population >= 100000:
+            radius = 2
+            pass
+        else:
+            radius = 1
+            pass
+
+        if radius > 2:
+            extents = cr.text_extents(city.name)
+
+            cr.set_source_rgb(0.2, 0.2, 0.2)
+            cr.arc(x, y, radius, 0, 2*math.pi)
+            cr.fill()
+
+            cr.set_font_size(14)
+            cr.move_to(x + 8, y + extents.height / 2)
+            cr.show_text(city.name)
+
+        cr.restore()