add: road processor functionality

Scripts/road_processor.py

@@ -0,0 +1,56 @@
+from pathlib import Path
+from shapely.geometry import Polygon, Point, shape
+import json
+
+
+def road_processor(x, y, diff):
+    """
+    Processes a GeoJSON file to find roads that have at least one node within a specified polygon.
+
+    Parameters:
+    x (float): The x-coordinate of the center of the selection box.
+    y (float): The y-coordinate of the center of the selection box.
+    diff (float): The half-width of the selection box.
+
+    Returns:
+    str: The file path of the output GeoJSON file containing the selected roads.
+    """
+    diff += 2 * diff
+    # Define the selection polygon
+    selection_box = Polygon([
+        [x + diff, y - diff],
+        [x - diff, y - diff],
+        [x - diff, y + diff],
+        [x + diff, y + diff]
+    ])
+
+    # Define input and output file paths
+    geojson_file = Path("./input_files/roads.json").resolve()
+    output_file = Path('./input_files/output_roads.geojson').resolve()
+
+    # Initialize a list to store the roads in the region
+    roads_in_region = []
+
+    # Read the GeoJSON file
+    with open(geojson_file, 'r') as file:
+        roads = json.load(file)
+        line_features = [feature for feature in roads['features'] if feature['geometry']['type'] == 'LineString']
+
+        # Check each road feature
+        for feature in line_features:
+            road_shape = shape(feature['geometry'])
+            # Check if any node of the road is inside the selection box
+            if any(selection_box.contains(Point(coord)) for coord in road_shape.coords):
+                roads_in_region.append(feature)
+
+    # Create a new GeoJSON structure with the selected roads
+    output_geojson = {
+        "type": "FeatureCollection",
+        "features": roads_in_region
+    }
+
+    # Write the selected roads to the output file
+    with open(output_file, 'w') as outfile:
+        json.dump(output_geojson, outfile)
+
+    return output_file