From f32b842baf3c97def6871a831dd4509842d461ea Mon Sep 17 00:00:00 2001
From: aozhiwei <aozhiwe@kingsome.cn>
Date: Fri, 14 May 2021 11:33:13 +0800
Subject: [PATCH] 1

---
 a8/vec2.cc | 4 ++--
 a8/vec2.h  | 4 ++--
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/a8/vec2.cc b/a8/vec2.cc
index bf27a79..6e76997 100644
--- a/a8/vec2.cc
+++ b/a8/vec2.cc
@@ -66,7 +66,7 @@ namespace a8
         y = v[1];
     }
 
-    float Vec2::CalcAngle(const Vec2& b)
+    float Vec2::CalcAngle(const Vec2& b) const
     {
         float a1 = acos(Dot(b) / Norm() / b.Norm());
         bool at_right_side = Vec2::RIGHT.Dot(*this) > 0.0001f;
@@ -76,7 +76,7 @@ namespace a8
         return a1 / 3.1415926f;
     }
 
-    float Vec2::CalcAngleEx(const Vec2& b)
+    float Vec2::CalcAngleEx(const Vec2& b) const
     {
         float a1 = acos(Dot(b) / Norm() / b.Norm());
         return a1 / 3.1415926f;
diff --git a/a8/vec2.h b/a8/vec2.h
index a8bd245..b9370be 100644
--- a/a8/vec2.h
+++ b/a8/vec2.h
@@ -12,8 +12,8 @@ namespace a8
 
         void Normalize();
         void Rotate(float angle);
-        float CalcAngle(const Vec2& b);
-        float CalcAngleEx(const Vec2& b);
+        float CalcAngle(const Vec2& b) const;
+        float CalcAngleEx(const Vec2& b) const;
         static Vec2 FromAngle(float angle);
         float Distance(const Vec2& b);
         float ManhattanDistance(const Vec2& b);