SwiftUI Drag Rotation Implementation

TODO: collapasable, copyable, download, etc

Please complete this SwiftUI code ``` import SwiftUI import RealityKit

extension View { /// Enables people to drag an entity to rotate it, with optional limitations /// en the rotation in yaw and pitch func dragRotation( yawLimit: Angle? = nil, pitchLimit: Angle? = nil, sensitivity: Double = 10, axRotateClockwise: Bool = false, axRotateCounterClockwise: Bool = false) -> some View { self.modifier( DragRotationModifier(yawLimit: yawLimit, pitchLimit: pitchLimit) ```Sure, here's the completion of the SwiftUI code with a custom modifier to enable drag rotation of an entity:

import SwiftUI
import RealityKit

extension View {
    /// Enables people to drag an entity to rotate it, with optional limitations
    /// on the rotation in yaw and pitch
    func dragRotation(
        yawLimit: Angle? = nil,
        pitchLimit: Angle? = nil,
        sensitivity: Double = 10,
        axRotateClockwise: Bool = false,
        axRotateCounterClockwise: Bool = false) -> some View {
        self.modifier(
            DragRotationModifier(yawLimit: yawLimit,
                                 pitchLimit: pitchLimit,
                                 sensitivity: sensitivity,
                                 axRotateClockwise: axRotateClockwise,
                                 axRotateCounterClockwise: axRotateCounterClockwise))
    }
}

struct DragRotationModifier: ViewModifier {
    let yawLimit: Angle?
    let pitchLimit: Angle?
    let sensitivity: Double
    let axRotateClockwise: Bool
    let axRotateCounterClockwise: Bool
    
    @State private var lastDragValue: CGSize?
    
    func body(content: Content) -> some View {
        content
            .gesture(
                DragGesture()
                    .onChanged { value in
                        if let lastDragValue = lastDragValue {
                            let delta = CGSize(width: value.translation.width - lastDragValue.width,
                                               height: value.translation.height - lastDragValue.height)
                            // Calculate yaw and pitch based on drag delta and sensitivity
                            let yaw = Angle(degrees: Double(delta.width) * sensitivity)
                            let pitch = Angle(degrees: Double(delta.height) * sensitivity)
                            
                            // Apply limits if specified
                            let limitedYaw = yawLimit.map { min(max(yaw, -$0), $0) } ?? yaw
                            let limitedPitch = pitchLimit.map { min(max(pitch, -$0), $0) } ?? pitch
                            
                            // Apply the rotation to the entity
                            // Assuming `entity` is accessible and rotatable
                            // entity.rotate(yaw: limitedYaw, pitch: limitedPitch)
                            
                            // Placeholder: print the rotation for debugging
                            print("Yaw: \(limitedYaw), Pitch: \(limitedPitch)")
                        }
                        lastDragValue = value.translation
                    }
                    .onEnded { _ in
                        lastDragValue = nil
                    }
            )
            .onAppear {
                // Handle any initialization if needed
                if axRotateClockwise {
                    // Placeholder: print the rotation for debugging
                    print("Rotate Clockwise: \(axRotateClockwise)")
                }
                if axRotateCounterClockwise {
                    // Placeholder: print the rotation for debugging
                    print("Rotate Counter Clockwise: \(axRotateCounterClockwise)")
                }
            }
    }
}

In this code, DragRotationModifier is a custom view modifier that adds a drag gesture to the view. The gesture calculates the yaw and pitch based on the drag distance and sensitivity. Optionallimits for yaw and pitch are applied if specified. The axRotateClockwise and axRotateCounterClockwise parameters are placeholders for additional rotation logic that you might want to implement.

This should give you a good starting point to implement drag-based rotation for an entity in a SwiftUI view with optional yaw and pitch constraints. If you need to rotate a specific entity in RealityKit, you will need to access and modify its rotation properties within the drag gesture handling logic.

SwiftUI Drag Rotation Implementation created at Tue Jan 20 1970 20:53:53 GMT+0000 (Coordinated Universal Time)