From 6a1f97fbc2c237ddcc19e5810d5b6e89ae7499a9 Mon Sep 17 00:00:00 2001
From: Sn-Kinos <dony435@naver.com>
Date: Wed, 21 Oct 2026 12:04:00 +0900
Subject: [PATCH] =?UTF-8?q?Stage=206=20=ED=96=89=EC=84=B1=EC=97=90=20?=
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---
 app/lib/core/ui/planet_25d.dart         | 62 +++++++++++++++++++++++++
 app/test/planet_give_reaction_test.dart | 18 +++++++
 2 files changed, 80 insertions(+)

diff --git a/app/lib/core/ui/planet_25d.dart b/app/lib/core/ui/planet_25d.dart
index ae31594..c74e4fd 100644
--- a/app/lib/core/ui/planet_25d.dart
+++ b/app/lib/core/ui/planet_25d.dart
@@ -472,6 +472,21 @@ class _Planet25DState extends State<Planet25D>
                         ),
                       ),
                     ),
+                  // Stage 6 — Figma `2024:20821` 「자기장(Field) 라인이 행성을 감싸며 외곽으로 방사됨」.
+                  // 본체 뒤에 깔아 구면 바깥으로 뻗는 부분만 보이게 한다.
+                  if (stage == 6)
+                    Positioned.fill(
+                      child: IgnorePointer(
+                        child: CustomPaint(
+                          key: const ValueKey('planet-field-lines'),
+                          painter: _FieldLinePainter(
+                            t: t,
+                            color: glow,
+                            lowEffects: _lowEffects,
+                          ),
+                        ),
+                      ),
+                    ),
                   // 6. 링 — 뒤쪽 절반. 본체 뒤에 깔린다.
                   if (ring)
                     Positioned.fill(
@@ -902,6 +917,53 @@ class _OrbitPainter extends CustomPainter {
       old.lowEffects != lowEffects;
 }
 
+/// Stage 6 자기장 — 양극을 잇는 고리를 좌우로 겹겹이 그리고, 밝은 띠가 안쪽에서 바깥 고리로
+/// 번져 나간다(외곽 방사). 저사양은 고리 수만 줄인다.
+class _FieldLinePainter extends CustomPainter {
+  const _FieldLinePainter({
+    required this.t,
+    required this.color,
+    required this.lowEffects,
+  });
+  final double t;
+  final Color color;
+  final bool lowEffects;
+
+  @override
+  void paint(Canvas canvas, Size size) {
+    final c = size.center(Offset.zero);
+    final r = size.shortestSide * 0.42;
+    final loops = lowEffects ? 2 : 4;
+    // 방사 위치 0~1 — 한 주기에 네 번 안쪽에서 바깥으로.
+    final wave = (t * 4) % 1;
+    for (var i = 0; i < loops; i++) {
+      final k = (i + 1) / loops;
+      final w = r * (0.55 + 0.75 * k);
+      final h = r * (1.05 + 0.25 * k);
+      final glow = 1 - ((k - wave).abs() * 2.5).clamp(0.0, 1.0);
+      final paint = Paint()
+        ..style = PaintingStyle.stroke
+        ..strokeWidth = 1.0 + glow * 1.2
+        ..color = Color.lerp(color, Colors.white, 0.35)!
+            .withValues(alpha: (0.14 + 0.36 * glow) * (1 - k * 0.4));
+      for (final side in const [-1.0, 1.0]) {
+        canvas.drawOval(
+          Rect.fromCenter(
+            center: c + Offset(side * w / 2, 0),
+            width: w,
+            height: h * 2,
+          ),
+          paint,
+        );
+      }
+    }
+  }
+
+  @override
+  bool shouldRepaint(_FieldLinePainter old) =>
+      old.t != t || old.color != color || old.lowEffects != lowEffects;
+}
+
 /// Stage 6: 폭죽 대신 구면 주위에 머무는 넓고 일정한 대기광.
 class _SustainedAura extends CustomPainter {
   const _SustainedAura({required this.color, required this.lowEffects});
diff --git a/app/test/planet_give_reaction_test.dart b/app/test/planet_give_reaction_test.dart
index 2d6158a..0b5197f 100644
--- a/app/test/planet_give_reaction_test.dart
+++ b/app/test/planet_give_reaction_test.dart
@@ -182,4 +182,22 @@ void main() {
       await tester.pump(const Duration(seconds: 3));
     });
   });
+
+  testWidgets('Stage 6 은 자기장 라인이 행성을 감싼다(Figma 2024:20821) · Stage 5 는 없다', (tester) async {
+    Future<void> pumpStage(int stage) => tester.pumpWidget(
+      MaterialApp(
+        home: Center(
+          child: Planet25D(
+            image: 'assets/figma/planet-home.png',
+            size: 200,
+            stage: stage,
+          ),
+        ),
+      ),
+    );
+    await pumpStage(6);
+    expect(find.byKey(const ValueKey('planet-field-lines')), findsOneWidget);
+    await pumpStage(5);
+    expect(find.byKey(const ValueKey('planet-field-lines')), findsNothing);
+  });
 }