From 7238a601fc0e074543e3fa1b1912bf7afa9d32bf Mon Sep 17 00:00:00 2001
From: Richard Piazza <richard@richardpiazza.com>
Date: Tue, 20 Jun 2023 06:29:23 -0500
Subject: [PATCH] Smooth Curves (#13)

---
 Sources/SwiftSVG/Path.ComponentParser.swift | 16 ++++++++++++----
 1 file changed, 12 insertions(+), 4 deletions(-)

diff --git a/Sources/SwiftSVG/Path.ComponentParser.swift b/Sources/SwiftSVG/Path.ComponentParser.swift
index 56a6580..807b8e4 100644
--- a/Sources/SwiftSVG/Path.ComponentParser.swift
+++ b/Sources/SwiftSVG/Path.ComponentParser.swift
@@ -79,11 +79,19 @@ public extension Path {
                 command = .cubicBezierCurve(cp1: currentPoint, cp2: currentPoint, point: currentPoint)
                 coordinates = .relative
             case .smoothCubicBezierCurve:
-                command = .cubicBezierCurve(cp1: currentPoint, cp2: .nan, point: .nan)
+                if case .cubicBezierCurve(_, let cp, _) = lastCommand {
+                    command = .cubicBezierCurve(cp1: cp.reflection(using: currentPoint), cp2: .nan, point: .nan)
+                } else {
+                    command = .cubicBezierCurve(cp1: currentPoint, cp2: .nan, point: .nan)
+                }
                 coordinates = .absolute
                 position = 2
             case .relativeSmoothCubicBezierCurve:
-                command = .cubicBezierCurve(cp1: currentPoint, cp2: currentPoint, point: currentPoint)
+                if case .cubicBezierCurve(_, let cp, _) = lastCommand {
+                    command = .cubicBezierCurve(cp1: cp.reflection(using: cp.reflection(using: currentPoint)), cp2: currentPoint, point: currentPoint)
+                } else {
+                    command = .cubicBezierCurve(cp1: currentPoint, cp2: currentPoint, point: currentPoint)
+                }
                 coordinates = .relative
                 position = 2
             case .quadraticBezierCurve:
@@ -102,9 +110,9 @@ public extension Path {
                 position = 2
             case .relativeSmoothQuadraticBezierCurve:
                 if case .quadraticBezierCurve(let cp, _) = lastCommand {
-                    command = .quadraticBezierCurve(cp: cp.reflection(using: currentPoint), point: .nan)
+                    command = .quadraticBezierCurve(cp: cp.reflection(using: currentPoint), point: currentPoint)
                 } else {
-                    command = .quadraticBezierCurve(cp: currentPoint, point: .nan)
+                    command = .quadraticBezierCurve(cp: currentPoint, point: currentPoint)
                 }
                 coordinates = .relative
                 position = 2