A ShapeStyle extension to generate smooth shadows

ShapeStyle+SmoothShadow.swift

import SwiftUI

extension ShapeStyle {
 	// Based on https://gist.github.com/sophiateutschler/54c0e6ca490fee658e303a63487dc382
	func smoothShadow(
		color: Color = Color(white: 0.0, opacity: 1.0 / 3.0),
		layers: Int = 3,
		curve: UnitCurve = .easeInOut,
		radius baseRadius: CGFloat,
		x baseX: CGFloat = 0.0,
		y baseY: CGFloat = 0.0
	) -> some ShapeStyle {
		var result = AnyShapeStyle(self)
		
		for currentLayer in 0 ..< layers {
			let progress = CGFloat(currentLayer) / CGFloat(layers)
			let radius = baseRadius * curve.value(at: progress)
			
			let x = baseX * curve.value(at: progress)
			let y = baseY * curve.value(at: progress)
			
			result = AnyShapeStyle(result.shadow(.drop(color: color, radius: radius, x: x, y: y)))
		}
		
		return result
	}
}