From a6d53944cdf88579c937b56ea735a3f61248ac18 Mon Sep 17 00:00:00 2001
From: Zeno Rogue <zeno@attnam.com>
Date: Sun, 29 Jan 2023 14:17:03 +0100
Subject: [PATCH] fixup to coordinates

---
 binary-tiling.cpp | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/binary-tiling.cpp b/binary-tiling.cpp
index 4e5d82ff..c2d207ab 100644
--- a/binary-tiling.cpp
+++ b/binary-tiling.cpp
@@ -1034,6 +1034,12 @@ EX hyperpoint get_horopoint(hyperpoint h) {
   return get_horopoint(h[0], h[1]);
   }
 
+EX hyperpoint inverse_horopoint(hyperpoint h) {
+  hyperpoint h1 = deparabolic13(h);
+  h1[1] /= 2 * bt::xy_mul(); h1[0] *= -1;
+  return h1;
+  }
+
 EX hyperpoint get_corner_horo_coordinates(cell *c, int i) {
   ld yy = log(2) / 2;
   ld xx = 1 / 2.;