add noc eventmap conversion config

src/c3nav/mapdata/nocutils.py

@@ -0,0 +1,51 @@
+import math
+from functools import cached_property
+
+import numpy as np
+from pydantic.main import BaseModel
+from pydantic.type_adapter import TypeAdapter
+from shapely import Point
+
+
+def deg2pos(lat_deg, lon_deg):
+    lat_rad = math.radians(lat_deg)
+    xpos = (lon_deg + 180.0) / 360.0
+    ypos = math.asinh(math.tan(lat_rad)) / math.pi / 2.0
+    return ypos, xpos
+
+
+class NocTransformLayerSchema(BaseModel):
+    level_id: int
+    scale: float | int
+    offset: tuple[float, float] | int
+
+    def convert(self, lat, lng) -> Point:
+        return np.array(deg2pos(lat, lng)) * self.scale + np.array(self.offset)
+
+
+class NocTwoPointLayerSchema(BaseModel):
+    level_id: int
+    latlng1_noc: tuple[float, float]
+    latlng1_nav: tuple[float, float]
+    latlng2_noc: tuple[float, float]
+    latlng2_nav: tuple[float, float]
+
+    @cached_property
+    def to_transform(self) -> NocTransformLayerSchema:
+        diff_noc = np.array(deg2pos(*self.latlng1_noc)) - np.array(deg2pos(*self.latlng2_noc))
+        print(diff_noc)
+        diff_nav = np.array(self.latlng1_nav) - np.array(self.latlng2_nav)
+        print(diff_nav)
+        scale = np.linalg.norm(diff_nav) / np.linalg.norm(diff_noc)
+        offset = np.array(self.latlng1_nav) - (np.array(deg2pos(*self.latlng1_noc)) * scale)
+        return NocTransformLayerSchema(
+            level_id=self.level_id,
+            scale=scale,
+            offset=tuple(offset),
+        )
+
+    def convert(self, lat, lng) -> Point:
+        return self.to_transform.convert(lat, lng)
+
+
+NocLayersSchema = TypeAdapter(dict[str, NocTransformLayerSchema | NocTwoPointLayerSchema])

src/c3nav/settings.py

@@ -14,9 +14,12 @@ from django.core.exceptions import ImproperlyConfigured
 from django.utils.crypto import get_random_string
 from django.utils.dateparse import parse_duration
 from django.utils.translation import gettext_lazy as _
+from pydantic.type_adapter import TypeAdapter
 from pyproj import Proj, Transformer
 
 from c3nav import __version__ as c3nav_version
+from c3nav.api.schema import BaseSchema
+from c3nav.mapdata.nocutils import NocLayersSchema
 from c3nav.utils.config import C3navConfigParser
 from c3nav.utils.environ import Env
 
@@ -215,6 +218,9 @@ if not HUB_API_SECRET:
     if HUB_API_SECRET_FILE.exists():
         HUB_API_SECRET = HUB_API_SECRET_FILE.read_text().strip()
 
+NOC_API_BASE = config.get('c3nav', 'noc_api_base', fallback='').removesuffix('/')
+NOC_LAYERS = NocLayersSchema.validate_json(config.get('c3nav', 'noc_layers', fallback='{}'))
+
 _db_backend = config.get('database', 'backend', fallback='sqlite3')
 DATABASES: dict[str, dict[str, str | int | Path]] = {
     'default': env.db_url('C3NAV_DATABASE') if 'C3NAV_DATABASE' in env else {