Tighten up frame and add tracks as single list for performance

tornados_us.py

@@ -13,8 +13,8 @@ import shapely.geometry as sgeom
 
 
 proj = ccrs.AlbersEqualArea(
-    central_longitude=-95,
-    central_latitude=40,
+    central_longitude=-93,
+    central_latitude=35,
 )
 water_blue = "#7ebfd4"
 
@@ -87,11 +87,11 @@ def read_data():
     return tornados
 
 
-def draw_map(data):
-    fig = plt.figure(frameon=False)
-    ax = fig.add_subplot(111, projection=proj)
+def draw_map(lons, lats):
+    fig = plt.figure(frameon=False, figsize=(8, 4.61))
+    ax = fig.add_axes([0, 0, 1, 1], projection=proj)
     ax.background_patch.set_facecolor(water_blue)
-    ax.set_extent([-125, -65, 20, 50], ccrs.Geodetic())
+    ax.set_extent([-122, -65, 20, 50], ccrs.Geodetic())
     ax.add_feature(land, facecolor="#f0f0f0")
     ax.add_feature(rivers, edgecolor=water_blue)
     ax.add_feature(lakes, facecolor=water_blue)
@@ -99,17 +99,22 @@ def draw_map(data):
     ax.add_feature(countries, edgecolor="grey", linewidth=0.2, alpha=0.6, dashes='--')
     ax.add_feature(states, edgecolor="grey", linewidth=0.2, alpha=0.4, dashes='--')
 
-    for i, t in enumerate(data):
-        print(i)
-        if t.elon < 0:
-            ax.plot([t.slon, t.elon], [t.slat, t.elat], 'r', lw=0.3, transform=ccrs.Geodetic())
-        else:
-            ax.plot([t.slon, t.slon], [t.slat, t.slat], 'r', lw=0.3, transform=ccrs.Geodetic())
+    ax.plot(lons, lats, 'r', lw=0.2, alpha=0.7, transform=ccrs.Geodetic())
 
-    fig.tight_layout()
+    ax.axis('off')
     plt.savefig("tornados_us.png", dpi=320)
 
 
 if __name__ == '__main__':
     ts = read_data()
-    draw_map(ts)
+    lons = []
+    lats = []
+    for t in ts:
+        if t.elon < 0:
+            lons.append(t.slon)
+            lons.append(t.elon)
+            lons.append(None)
+            lats.append(t.slat)
+            lats.append(t.elat)
+            lats.append(None)
+    draw_map(lons, lats)