switch to matplotlib and add bundesland borders

main.py

@@ -1,11 +1,9 @@
 import argparse
 import json
 
-import cartopy.crs as ccrs
 import geopandas as gpd
-import geoplot
-import geoplot.crs as gcrs
 import matplotlib.pyplot as plt
+import numpy as np
 
 
 def main(
@@ -29,33 +27,41 @@ def main(
     for plz_prefix in plz_prefixes:
         data.loc[data["plz"].str.startswith(plz_prefix), "highlighted"] = True
 
-    ax = plt.axes(projection=ccrs.TransverseMercator())
-    geoplot.polyplot(
-        data,
-        projection=gcrs.TransverseMercator(),
-        edgecolor=map_background_color,
-        facecolor=map_background_color,
-        linewidth=0.3,
-        ax=ax,
-    )
-    geoplot.polyplot(
-        data[data["highlighted"]],
-        projection=gcrs.TransverseMercator(),
-        edgecolor=map_accent_color,
-        facecolor=map_accent_color,
-        linewidth=0.3,
-        ax=ax,
-    )
+    # TODO: This should instead be a proper geo spatial projection
+    coordinate_transform = np.array([[1.0, 1.6]]).T
+
+    ax = plt.axes(aspect="equal")
+    for bundesland in data["bundesland"].unique():
+        bundesland_df = data[data["bundesland"] == bundesland]
+        union = bundesland_df.unary_union
+        for geom in getattr(union, "geoms", [union]):
+            ax.fill(
+                *(geom.exterior.xy * coordinate_transform),
+                fc=map_background_color,
+                ec=image_background_color,
+                linewidth=0.1,
+            )
+
+        if not any(bundesland_df["highlighted"]):
+            continue
+
+        union = bundesland_df[bundesland_df["highlighted"]].unary_union
+        for geom in getattr(union, "geoms", [union]):
+            ax.fill(
+                *(geom.exterior.xy * coordinate_transform),
+                fc=map_accent_color,
+                ec=None,
+            )
 
     ax.set_facecolor(image_background_color)
     plt.axis("off")
-    plt.tight_layout(pad=0.0, h_pad=None, w_pad=None)
+    plt.tight_layout(pad=0.0, h_pad=0.0, w_pad=0.0)
     plt.savefig(
         output_file_path,
-        dpi=600,
+        dpi=300,
         facecolor=image_background_color,
         edgecolor="none",
-        bbox_inches='tight',
+        bbox_inches="tight",
     )
 
 

requirements.txt

@@ -1,2 +1,2 @@
 geopandas==0.11.1
-geoplot==0.5.1
+matplotlib==3.6.2