Change region to use top-left and bottom-right coordinates

Replace center+delta region representation with a bounding box defined
by topLeft and bottomRight coordinate pairs, which maps more directly
to the visible map area.

https://claude.ai/code/session_0162emnCi1KxW5FkTNn2ZrvH

schema.graphqls

@@ -18,10 +18,8 @@ type System {
 }
 
 type Region {
-  latitude: Float!
-  longitude: Float!
-  latitudeDelta: Float!
-  longitudeDelta: Float!
+  topLeft: Coordinates!
+  bottomRight: Coordinates!
 }
 
 type ParkingSystem {

src/entities/SharedEntities.ts

@@ -12,9 +12,7 @@ export interface ICoordinates {
 }
 
 export interface IRegion {
-  latitude: number;
-  longitude: number;
-  latitudeDelta: number;
-  longitudeDelta: number;
+  topLeft: ICoordinates;
+  bottomRight: ICoordinates;
 }
 

src/index.ts

@@ -26,10 +26,8 @@ const supportedSystems: InterchangeSystemBuilderArguments[] = [
     useSelfUpdatingEtas: true,
     shuttleStopArrivalDegreeDelta: 0.001,
     initialRegion: {
-      latitude: 33.7937,
-      longitude: -117.8531,
-      latitudeDelta: 0.01,
-      longitudeDelta: 0.01,
+      topLeft: { latitude: 33.7987, longitude: -117.8581 },
+      bottomRight: { latitude: 33.7887, longitude: -117.8481 },
     },
   }
 ]

src/resolvers/__tests__/SystemResolverTests.test.ts

@@ -40,10 +40,14 @@ describe("SystemResolvers", () => {
     query GetSystemInitialRegion($systemId: ID!) {
       system(id: $systemId) {
         initialRegion {
-          latitude
-          longitude
-          latitudeDelta
-          longitudeDelta
+          topLeft {
+            latitude
+            longitude
+          }
+          bottomRight {
+            latitude
+            longitude
+          }
         }
       }
     }
@@ -56,10 +60,8 @@ describe("SystemResolvers", () => {
       expect(response.body.singleResult.errors).toBeUndefined();
       const initialRegion = (response.body.singleResult.data as any).system.initialRegion;
       expect(initialRegion).toEqual({
-        latitude: 33.7937,
-        longitude: -117.8531,
-        latitudeDelta: 0.01,
-        longitudeDelta: 0.01,
+        topLeft: { latitude: 33.7987, longitude: -117.8581 },
+        bottomRight: { latitude: 33.7887, longitude: -117.8481 },
       });
     });
   });

testHelpers/apolloTestServerHelpers.ts

@@ -27,10 +27,8 @@ const systemInfoForTesting: InterchangeSystemBuilderArguments = {
   useSelfUpdatingEtas: false,
   shuttleStopArrivalDegreeDelta: 0.001,
   initialRegion: {
-    latitude: 33.7937,
-    longitude: -117.8531,
-    latitudeDelta: 0.01,
-    longitudeDelta: 0.01,
+    topLeft: { latitude: 33.7987, longitude: -117.8581 },
+    bottomRight: { latitude: 33.7887, longitude: -117.8481 },
   },
 };