Directional nodes: map Rotate updates direction / camera:direction

src/Shared/EditorLayer/EditorMapLayer+Edit.swift

@@ -458,6 +458,54 @@ extension EditorMapLayer {
 		mapData.endUndoGrouping()
 	}
 
+	// MARK: Rotate direction tag
+
+	func rotateDirectionBegin() {
+		guard let node = selectedNode,
+		      let tagKey = node.technicalDirectionTagKey,
+		      let bearing = node.direction?.location
+		else { return }
+		mapData.beginUndoGrouping()
+		dragState.didMove = false
+		directionRotateTagKey = tagKey
+		directionRotateInitialBearing = bearing
+	}
+
+	func rotateDirectionContinue(delta: CGFloat) {
+		guard let node = selectedNode,
+		      let tagKey = directionRotateTagKey,
+		      let initialBearing = directionRotateInitialBearing
+		else { return }
+
+		if dragState.didMove {
+			mapData.endUndoGrouping()
+			silentUndo = true
+			mapData.undo()
+			silentUndo = false
+			mapData.beginUndoGrouping()
+		}
+		dragState.didMove = true
+
+		let deltaDegrees = Int(round(Double(-delta) * 180 / .pi))
+		let bearing = ((initialBearing + deltaDegrees) % 360 + 360) % 360
+		guard let value = node.directionTagValue(forBearingDegrees: bearing) else { return }
+		var tags = node.tags
+		tags[tagKey] = value
+		mapData.setTags(tags, for: node)
+		setNeedsLayout()
+		owner.didUpdateObject()
+	}
+
+	func rotateDirectionFinish() {
+		mapData.endUndoGrouping()
+		directionRotateTagKey = nil
+		directionRotateInitialBearing = nil
+	}
+
+	func isRotateDirectionMode() -> Bool {
+		directionRotateTagKey != nil
+	}
+
 	// MARK: Editing
 
 	func adjust(_ node: OsmNode, byScreenDistance delta: CGPoint) {
@@ -672,9 +720,12 @@ extension EditorMapLayer {
 					actionList += [.STRAIGHTEN, .REVERSE, .DUPLICATE, .CREATE_RELATION]
 				}
 			}
-		} else if selectedNode != nil {
+		} else if let selectedNode = selectedNode {
 			// node
 			actionList += [.DUPLICATE]
+			if selectedNode.technicalDirectionTagKey != nil {
+				actionList.append(.ROTATE)
+			}
 		} else if let selectedRelation = selectedRelation {
 			// relation
 			if selectedRelation.isMultipolygon() {
@@ -744,7 +795,11 @@ extension EditorMapLayer {
 				selectedRelation = newObject.isRelation()
 				owner.placePushpinForSelection(at: nil)
 			case .ROTATE:
-				guard selectedWay != nil || (selectedRelation?.isMultipolygon() ?? false) else {
+				let canRotateGeometry = selectedWay != nil || (selectedRelation?.isMultipolygon() ?? false)
+				let canRotateDirection = selectedWay == nil &&
+					selectedRelation == nil &&
+					selectedNode?.technicalDirectionTagKey != nil
+				guard canRotateGeometry || canRotateDirection else {
 					throw EditError.text(NSLocalizedString("Only ways/multipolygons can be rotated", comment: ""))
 				}
 				owner.startObjectRotation()

src/Shared/EditorLayer/EditorMapLayer.swift

@@ -178,6 +178,10 @@ final class EditorMapLayer: CALayer {
 
 	var dragState = DragState(startPoint: .zero, didMove: false, confirmDrag: false)
 
+	/// Active while rotating a node's `direction` / `camera:direction` tag (not geometry).
+	var directionRotateTagKey: String?
+	var directionRotateInitialBearing: Int?
+
 	let objectFilters = EditorFilters()
 
 	var whiteText = false {

src/Shared/MapView.swift

@@ -269,12 +269,20 @@ final class MapView: UIView, UIGestureRecognizerDelegate, UIContextMenuInteracti
 		// remove previous rotation in case user pressed Rotate button twice
 		endObjectRotation()
 
+		let isDirectionRotate = editorLayer.selectedWay == nil &&
+			editorLayer.selectedRelation == nil &&
+			editorLayer.selectedNode?.technicalDirectionTagKey != nil
+
 		guard let rotateObjectCenter = editorLayer.selectedNode?.latLon
 			?? editorLayer.selectedWay?.centerPoint()
 			?? editorLayer.selectedRelation?.centerPoint()
 		else {
 			return
 		}
+
+		if isDirectionRotate {
+			editorLayer.rotateDirectionBegin()
+		}
 		removePin()
 		let rotateObjectOverlay = CAShapeLayer()
 		let radiusInner: CGFloat = 70
@@ -303,6 +311,9 @@ final class MapView: UIView, UIGestureRecognizerDelegate, UIContextMenuInteracti
 
 	func endObjectRotation() {
 		isRotateObjectMode?.rotateObjectOverlay.removeFromSuperlayer()
+		if editorLayer.isRotateDirectionMode() {
+			editorLayer.rotateDirectionFinish()
+		}
 		placePushpinForSelection()
 		editorLayer.dragState.confirmDrag = false
 		isRotateObjectMode = nil
@@ -1048,13 +1059,21 @@ final class MapView: UIView, UIGestureRecognizerDelegate, UIContextMenuInteracti
 		}
 		// Rotate object on screen
 		if rotationGesture.state == .began {
-			editorLayer.rotateBegin()
+			if !editorLayer.isRotateDirectionMode() {
+				editorLayer.rotateBegin()
+			}
 		} else if rotationGesture.state == .changed {
-			editorLayer.rotateContinue(delta: rotationGesture.rotation, rotate: rotate)
+			if editorLayer.isRotateDirectionMode() {
+				editorLayer.rotateDirectionContinue(delta: rotationGesture.rotation)
+			} else {
+				editorLayer.rotateContinue(delta: rotationGesture.rotation, rotate: rotate)
+			}
 		} else {
 			// ended
+			if !editorLayer.isRotateDirectionMode() {
+				editorLayer.rotateFinish()
+			}
 			endObjectRotation()
-			editorLayer.rotateFinish()
 		}
 	}
 

src/iOS/Direction/OsmNode+Direction.swift

@@ -46,6 +46,35 @@ extension OsmNode {
 		return nil
 	}
 
+	/// Tag key (`direction` or `camera:direction`) whose value parses as a technical bearing, if any.
+	var technicalDirectionTagKey: String? {
+		for key in ["direction", "camera:direction"] {
+			if let value = tags[key],
+			   OsmNode.directionFromString(value) != nil
+			{
+				return key
+			}
+		}
+		return nil
+	}
+
+	/// Bearing in degrees clockwise from north for a point direction (`direction` length 0).
+	var directionPointBearing: Int? {
+		guard let range = direction, range.length == 0 else { return nil }
+		return range.location
+	}
+
+	/// OSM tag value for a bearing, preserving arc span when the current direction is a range.
+	func directionTagValue(forBearingDegrees bearing: Int) -> String? {
+		guard let range = direction else { return nil }
+		let normalized = ((bearing % 360) + 360) % 360
+		if range.length == 0 {
+			return "\(normalized)"
+		}
+		let end = (normalized + range.length) % 360
+		return "\(normalized)-\(end)"
+	}
+
 	private static func directionFromString(_ string: String) -> NSRange? {
 		if let direction = Float(string) ?? cardinalDictionary[string] {
 			return NSMakeRange(Int(direction), 0)

src/iOS/GoMapTests/OsmNode_DirectionTestCase.swift

@@ -36,6 +36,44 @@ class OsmNode_DirectionTestCase: XCTestCase {
 		XCTAssertEqual(node.direction?.lowerBound, direction)
 	}
 
+	func testTechnicalDirectionTagKeyPrefersDirectionOverCameraDirection() {
+		let node = OsmNode(asUserCreated: "")
+		node.constructTag("direction", value: "90")
+		node.constructTag("camera:direction", value: "180")
+
+		XCTAssertEqual(node.technicalDirectionTagKey, "direction")
+	}
+
+	func testTechnicalDirectionTagKeyUsesCameraDirectionWhenDirectionAbsent() {
+		let node = OsmNode(asUserCreated: "")
+		node.constructTag("camera:direction", value: "45")
+
+		XCTAssertEqual(node.technicalDirectionTagKey, "camera:direction")
+	}
+
+	func testTechnicalDirectionTagKeyIsNilForHighwayForwardBackward() {
+		let node = OsmNode(asUserCreated: "")
+		node.constructTag("highway", value: "stop")
+		node.constructTag("direction", value: "forward")
+
+		XCTAssertNil(node.technicalDirectionTagKey)
+		XCTAssertNil(node.direction)
+	}
+
+	func testDirectionTagValueFormatsPointBearing() {
+		let node = OsmNode(asUserCreated: "")
+		node.constructTag("direction", value: "10")
+
+		XCTAssertEqual(node.directionTagValue(forBearingDegrees: 95), "95")
+	}
+
+	func testDirectionTagValuePreservesRangeSpan() {
+		let node = OsmNode(asUserCreated: "")
+		node.constructTag("direction", value: "90-120")
+
+		XCTAssertEqual(node.directionTagValue(forBearingDegrees: 0), "0-30")
+	}
+
 	func testDirectionShouldParseCardinalDirectionToLowerBound() {
 		let key = "camera:direction"