Add a test map generation tool

utils/geojson-to-polygons.py

@@ -0,0 +1,70 @@
+#!/usr/bin/env python3
+
+import sys
+import json
+
+MAP_SIZE = 1000.
+MARGIN = 50.
+
+def main():
+    geojson = json.load(sys.stdin)
+
+    points = []
+    polygons = []
+
+    for feature in geojson['features']:
+        geometry = feature['geometry']
+        geometry_type = geometry['type']
+        coordinates = geometry['coordinates']
+
+        if geometry_type == 'Point':
+            assert len(coordinates) == 2
+            name = feature['properties']['name']
+            points.append((coordinates[0], coordinates[1], name))
+        elif geometry_type == 'Polygon':
+            assert len(coordinates) == 1  # no inner rings
+            outer_ring = coordinates[0]
+            assert len(outer_ring) >= 4  # at least a triangle
+            assert outer_ring[0] == outer_ring[-1]
+            vertices = [(v[0], v[1]) for v in outer_ring[:-1]]
+            polygons.append(vertices)
+        else:
+            raise Exception(f'Unexpected geometry type: {geometry_type}')
+
+    x_min, y_min, _ = points[0]
+    x_max, y_max = x_min, y_min
+
+    for (x, y, _) in points:
+        x_min = min(x_min, x)
+        x_max = max(x_max, x)
+        y_min = min(y_min, y)
+        y_max = max(y_max, y)
+
+    for polygon in polygons:
+        for (x, y) in polygon:
+            x_min = min(x_min, x)
+            x_max = max(x_max, x)
+            y_min = min(y_min, y)
+            y_max = max(y_max, y)
+
+    x_shift = (x_max + x_min) / 2.
+    x_scale = (MAP_SIZE - MARGIN) / (x_max - x_min)
+    y_shift = (y_max + y_min) / 2.
+    y_scale = (MAP_SIZE - MARGIN) / (y_max - y_min)
+
+    for (x, y, name) in points:
+        x = x_scale * (x - x_shift)
+        y = y_scale * (y - y_shift)
+        print(f'Point {name}: ({x}, {y})')
+
+    for polygon in polygons:
+        print('Ichnography::from(ConvexPolygon::from_convex_hull(&[')
+        for x, y in polygon:
+            x = x_scale * (x - x_shift)
+            y = y_scale * (y - y_shift)
+            print(f'Point::new({x}, {y}),')
+        print(']).unwrap()),')
+
+
+if __name__ == '__main__':
+    main()