feat: use center coordinates of faces in output filenames

map.py

@@ -74,6 +74,8 @@ class Face:
     def __init__(self, vs):
         self.vertices = vs
         self.tris = []
+        avg = np.average(self.vertices, axis=0)
+        self.center = convert_to_spherical(*avg)
         # Sort vertices so that so that the normal points "outward"
         if np.dot(self.vertices[0], np.cross(self.vertices[1] - self.vertices[0], self.vertices[2] - self.vertices[0])) < 0:
             self.vertices = self.vertices[::-1]
@@ -82,6 +84,14 @@ class Face:
         self.plane_coords = [self.tris[0].plane_coords(v) for v in self.vertices]
 
 
+def convert_to_spherical(x, y, z):
+    xy = sqrt(x**2+y**2)
+    lon = atan2(z, xy)*180/pi
+    lat = atan2(y, x)*180/pi
+    mag = sqrt(x**2+y**2+z**2)
+    return np.array([lon, lat, mag])
+
+
 def convert_to_cartesian(lon, lat):
     x = cos(lon*pi/180)
     y = sin(lon*pi/180)
@@ -139,7 +149,18 @@ def main(ns):
         maxy = max(v[1] for v in face.plane_coords)
         w = maxx - minx
         h = maxy - miny
-        outfile = ns.out.format(faces=os.path.basename(ns.faces).rsplit('.', 1)[0], geojson=ns.geojson, face=i)
+        formatters = dict(
+            faces=os.path.basename(ns.faces).rsplit('.', 1)[0],
+            geojson=ns.geojson,
+            face=i,
+            lon=face.center[0],
+            lat=face.center[1],
+            mag=face.center[2],
+            ilon=int(face.center[0]),
+            ilat=int(face.center[1]),
+            imag=int(face.center[2]),
+        )
+        outfile = ns.out.format(**formatters)
         os.makedirs(os.path.dirname(outfile), exist_ok=True)
         with open(outfile, 'w') as svg:
             svg.write(f'<svg xmlns="http://www.w3.org/2000/svg" viewBox="{minx} {miny} {w} {h}" width="{w}" height="{h}" id="face{i}">\n')
@@ -163,7 +184,7 @@ if __name__ == '__main__':
     ap = argparse.ArgumentParser()
     ap.add_argument('--geojson', '-g', default='countries.geojson')
     ap.add_argument('--faces', '-f', default='shapes/cube.json')
-    ap.add_argument('--out', '-o', default='faces/{faces}/face{face}.svg')
+    ap.add_argument('--out', '-o', default='faces/{faces}/face{face}_{ilat}_{ilon}.svg')
     ap.add_argument('--scale', '-s', type=float, default=1)
     ns = ap.parse_args()
     main(ns)