From 7bbb6e0a1c5895f4825ed60ac55aca41e0a35835 Mon Sep 17 00:00:00 2001
From: Benedict Strube <benedict@enduco.app>
Date: Sat, 29 Jan 2022 21:57:45 +0100
Subject: [PATCH 1/2] feat(projectBack): added projectBack method as inverse
 method to project

projectBack maps an on screen coordinate to a map coordinate. This is the inverse method to project which maps a map coordinate to an on screen coordinate.
---
 src/ui-mapbox/common.ts        |  5 +++++
 src/ui-mapbox/index.android.ts |  8 ++++++++
 src/ui-mapbox/index.d.ts       |  3 ++-
 src/ui-mapbox/index.ios.ts     | 13 +++++++++++++
 4 files changed, 28 insertions(+), 1 deletion(-)

diff --git a/src/ui-mapbox/common.ts b/src/ui-mapbox/common.ts
index e64fba1..523a1c0 100755
--- a/src/ui-mapbox/common.ts
+++ b/src/ui-mapbox/common.ts
@@ -703,6 +703,8 @@ export interface MapboxApi {
 
     removeImage(imageId: string, nativeMap?: any): Promise<void>;
     project(data: LatLng): { x: number; y: number };
+
+    projectBack(point: { x: number, y: number }): LatLng;
 }
 
 // ------------------------------------------------------------
@@ -1061,6 +1063,9 @@ export abstract class MapboxViewCommonBase extends ContentView implements Mapbox
     project(data: LatLng) {
         return this.mapbox && this.mapbox.project(data);
     }
+    projectBack(screenCoordinate: { x: number, y: number }): LatLng {
+        return this.mapbox && this.mapbox.projectBack(screenCoordinate);
+    }
 }
 
 // -----------------------------------------------------------------
diff --git a/src/ui-mapbox/index.android.ts b/src/ui-mapbox/index.android.ts
index 8e6d60e..406e902 100755
--- a/src/ui-mapbox/index.android.ts
+++ b/src/ui-mapbox/index.android.ts
@@ -3391,4 +3391,12 @@ export class Mapbox extends MapboxCommon implements MapboxApi {
         const screenLocation = this._mapboxMapInstance.getProjection().toScreenLocation(mapboxPoint);
         return { x: Utils.layout.toDeviceIndependentPixels(screenLocation.x), y: Utils.layout.toDeviceIndependentPixels(screenLocation.y) };
     }
+    projectBack(screenCoordinate: { x: number, y: number }): LatLng {
+        const pointf = new android.graphics.PointF(screenCoordinate.x, screenCoordinate.y);
+        const coordinate = this._mapboxMapInstance.getProjection().fromScreenLocation(pointf);
+        return {
+            lat: coordinate.getLatitude(),
+            lng: coordinate.getLongitude()
+        }
+    }
 }
diff --git a/src/ui-mapbox/index.d.ts b/src/ui-mapbox/index.d.ts
index dce8922..ac35fca 100644
--- a/src/ui-mapbox/index.d.ts
+++ b/src/ui-mapbox/index.d.ts
@@ -97,4 +97,5 @@ export declare class Mapbox extends MapboxCommon implements MapboxApi {
         x: number;
         y: number;
     };
-}
\ No newline at end of file
+    projectBack(screenCoordinate: { x: number, y: number }): LatLng;
+}
diff --git a/src/ui-mapbox/index.ios.ts b/src/ui-mapbox/index.ios.ts
index e7769b4..de82922 100755
--- a/src/ui-mapbox/index.ios.ts
+++ b/src/ui-mapbox/index.ios.ts
@@ -3159,6 +3159,19 @@ export class Mapbox extends MapboxCommon implements MapboxApi {
         const { x, y } = theMap.convertCoordinateToPointToView({ latitude: data.lat, longitude: data.lng }, theMap);
         return { x, y };
     }
+
+    projectBack(screenCoordinate: { x: number, y: number }): LatLng {
+        const theMap: MGLMapView = this._mapboxViewInstance;
+        const cgPoint = {
+            x: screenCoordinate.x,
+            y: screenCoordinate.y
+        }
+        const coordinate = theMap.convertPointToCoordinateFromView(cgPoint, theMap);
+        return {
+            lat: coordinate.latitude,
+            lng: coordinate.longitude
+        }
+    }
 }
 
 const _addObserver = (eventName, callback) => NSNotificationCenter.defaultCenter.addObserverForNameObjectQueueUsingBlock(eventName, null, NSOperationQueue.mainQueue, callback);

From 99d06422767834046018ba2aace6257a413b720e Mon Sep 17 00:00:00 2001
From: Benedict Strube <benedict@enduco.app>
Date: Sun, 6 Feb 2022 22:16:07 +0100
Subject: [PATCH 2/2] fix: added project methods to API

---
 src/ui-mapbox/common.ts | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/ui-mapbox/common.ts b/src/ui-mapbox/common.ts
index 523a1c0..b64260a 100755
--- a/src/ui-mapbox/common.ts
+++ b/src/ui-mapbox/common.ts
@@ -872,6 +872,13 @@ export interface MapboxViewApi {
     onLowMemory(): Promise<any>;
 
     onDestroy(): Promise<any>;
+
+    project(data: LatLng): {
+        x: number;
+        y: number;
+    };
+
+    projectBack(screenCoordinate: { x: number, y: number }): LatLng;
 }
 
 // ----------------------------------------------------------------------------------------