Drag Gesture Question

DragGestureTest.swift

import SwiftUI

struct TestCanvas: View {
    @State private var currentGestureLocation: CGPoint = .zero
    
    let colors = [
        Color.gray,
        Color.gray,
        Color.gray,
        Color.gray
    ]
    
    var body: some View {
        ZStack {
            VStack {
                ForEach(colors.indices, id: \.self) { idx in
                    colors[idx]
                        .frame(maxWidth: 200, maxHeight: 50)
                        .overlay(GeometryReader { geo in
                            Color.clear
                                .onTapGesture {
                                    
                                }
                        })
                }
            }
            Circle()
                .fill(.green)
                .frame(width: 20, height: 20)
                .position(currentGestureLocation)
        }
        .gesture(
            DragGesture(minimumDistance: 0)
                .onChanged { value in
                    currentGestureLocation = value.location
                }
                .onEnded { _ in
                    currentGestureLocation = .zero
                }
        )
    }

}