Camera panning logic

Assets/CameraControl.cs

@@ -21,6 +21,8 @@ public class CameraControl : MonoBehaviour
     public float TargetZoom { get { return _targetZoom; } }
     private float _targetZoom;
     private Vector2 _targetPosition;
+    private Vector2? _panningClickPosition;
+    private Vector3? _panningCameraPosition;
 
     private new Camera camera;
 
@@ -33,6 +35,18 @@ public class CameraControl : MonoBehaviour
 
     void Update()
     {
+        var isPanning = Input.GetMouseButton(1);
+
+        if (!isPanning)
+        {
+            if (_panningClickPosition != null)
+            {
+                _panningClickPosition = null;
+                _panningCameraPosition = null;
+                _targetPosition = (Vector2)transform.position;
+                _targetZoom = camera.orthographicSize;
+            }
+
             // calculate target zoom
             var scroll = Input.GetAxisRaw("Mouse ScrollWheel");
             if (scroll != 0)
@@ -62,7 +76,11 @@ public class CameraControl : MonoBehaviour
 
             // Move towards the target zoom
             if (_targetZoom != camera.orthographicSize)
+                if (!isPanning)
                     camera.orthographicSize = Mathf.Lerp(camera.orthographicSize, _targetZoom, Time.deltaTime * TargetZoomMultiplier);
+                else
+                    // panning cancels target zoom immediately
+                    _targetZoom = camera.orthographicSize;
 
             // Move towards the target position
             if (_targetPosition != (Vector2)transform.position)
@@ -71,4 +89,24 @@ public class CameraControl : MonoBehaviour
                 transform.position = new Vector3(newPosition.x, newPosition.y, -20);
             }
         }
+        else
+        {
+            if (_panningClickPosition == null)
+            {
+                _panningClickPosition = Input.mousePosition;
+                _panningCameraPosition = transform.position;
+            }
+            // We need to apply the delta between the initial click position and the current mouse position to the camera's position
+            var worldDelta = camera.ScreenToWorldPoint(Input.mousePosition) - camera.ScreenToWorldPoint(_panningClickPosition.Value);
+            Debug.Log($"worldDelta: {worldDelta} screenDelta: {(Vector2)Input.mousePosition - _panningClickPosition.Value}");
+
+            transform.position = new Vector3(
+                _panningCameraPosition.Value.x - worldDelta.x,
+                _panningCameraPosition.Value.y - worldDelta.y,
+                -20
+            );
+        }
+
+    }
+
 }