From 29453228f36e5a0adb579e2c9bdf7f4ddc8a79c0 Mon Sep 17 00:00:00 2001
From: Jaron Kent-Dobias <jaron@kent-dobias.com>
Date: Wed, 19 Feb 2020 17:32:21 -0500
Subject: Fixed printing reflection lines

---
 spheres_infinite.cpp | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/spheres_infinite.cpp b/spheres_infinite.cpp
index 7879f34..f7e11ad 100644
--- a/spheres_infinite.cpp
+++ b/spheres_infinite.cpp
@@ -74,11 +74,9 @@ public:
     glColor3d(1.0, 0.0, 0.0);
     glLineWidth(3);
     glBegin(GL_LINES);
-      Euclidean<double, D> a_tmp = t->r;
-      a_tmp.t /= 2;
       Euclidean<double, D> r_tmp = t->r;
       Vector<double, 2> r_center = r_tmp.t / 2;
-      double θ = acos(r_tmp.r(1, 1)) / 2;
+      double θ = atan2(r_center(1), r_center(0));
       Vector<double, 2> v1 = s0_tmp.act({r_center(0) + 50*L * sin(θ), r_center(1) - 50*L * cos(θ)});
       Vector<double, 2> v2 = s0_tmp.act({r_center(0) - 50*L * sin(θ), r_center(1) + 50*L * cos(θ)});
       glVertex2d(v1(0), v1(1));
-- 
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