ENH: add /rockets/{id}/drawing-geometry endpoint

Exposes structured drawing geometry that mirrors rocketpy.Rocket.draw(),
so clients can redraw a rocket using the same shape math rocketpy uses
without server-side rendering or duplicated geometry logic in the UI.

Response carries per-surface shape_x/shape_y arrays, body tube segments,
motor patch polygons (nozzle, chamber, grains, tanks, outline), rail
button positions, sensors, t=0 CG/CP, and drawing bounds. Coordinates
are already transformed into the draw frame rocketpy uses.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: aasitvora99

src/controllers/rocket.py

@@ -4,7 +4,11 @@
     ControllerBase,
     controller_exception_handler,
 )
-from src.views.rocket import RocketSimulation, RocketCreated
+from src.views.rocket import (
+    RocketSimulation,
+    RocketCreated,
+    RocketDrawingGeometry,
+)
 from src.models.motor import MotorModel
 from src.models.rocket import (
     RocketModel,
@@ -75,6 +79,27 @@ async def get_rocketpy_rocket_binary(self, rocket_id: str) -> bytes:
         rocket_service = RocketService.from_rocket_model(rocket.rocket)
         return rocket_service.get_rocket_binary()
 
+    @controller_exception_handler
+    async def get_rocket_drawing_geometry(
+        self, rocket_id: str
+    ) -> RocketDrawingGeometry:
+        """
+        Build the drawing geometry payload for a persisted rocket.
+
+        Args:
+            rocket_id: str
+
+        Returns:
+            views.RocketDrawingGeometry
+
+        Raises:
+            HTTP 404 Not Found: If the rocket does not exist in the database.
+            HTTP 422: If the rocket has no aerodynamic surfaces to draw.
+        """
+        rocket = await self.get_rocket_by_id(rocket_id)
+        rocket_service = RocketService.from_rocket_model(rocket.rocket)
+        return rocket_service.get_drawing_geometry()
+
     @controller_exception_handler
     async def get_rocket_simulation(
         self,

src/routes/rocket.py

@@ -9,6 +9,7 @@
     RocketSimulation,
     RocketCreated,
     RocketRetrieved,
+    RocketDrawingGeometry,
 )
 from src.models.rocket import (
     RocketModel,
@@ -177,3 +178,23 @@ async def simulate_rocket(
     """
     with tracer.start_as_current_span("get_rocket_simulation"):
         return await controller.get_rocket_simulation(rocket_id)
+
+
+@router.get("/{rocket_id}/drawing-geometry")
+async def get_rocket_drawing_geometry(
+    rocket_id: str,
+    controller: RocketControllerDep,
+) -> RocketDrawingGeometry:
+    """
+    Returns structured drawing geometry for the rocket so that a frontend
+    can redraw exactly what rocketpy.Rocket.draw() would render.
+
+    Response contains shape coordinate arrays for each aerodynamic surface,
+    tube segments, motor polygons (nozzle, chamber, grains, tanks, outline),
+    rail-button positions, CG/CP at t=0, sensors, and overall drawing bounds.
+
+    ## Args
+    ``` rocket_id: Rocket ID ```
+    """
+    with tracer.start_as_current_span("get_rocket_drawing_geometry"):
+        return await controller.get_rocket_drawing_geometry(rocket_id)