From 39ce061fa7bc7574d637b7c2777d323bc3fed83d Mon Sep 17 00:00:00 2001
From: Zeno Rogue <zeno@attnam.com>
Date: Mon, 24 Dec 2018 01:10:55 +0100
Subject: [PATCH] use_atan configurable for RotatedHyperboles

---
 config.cpp    | 1 +
 conformal.cpp | 6 ++++++
 hyper.h       | 1 +
 hypgraph.cpp  | 6 ++++--
 4 files changed, 12 insertions(+), 2 deletions(-)

diff --git a/config.cpp b/config.cpp
index 922f86a1..1f0af4d9 100644
--- a/config.cpp
+++ b/config.cpp
@@ -342,6 +342,7 @@ void initConfig() {
   
   addsaver(conformal::formula, "formula");
   addsaverenum(conformal::basic_model, "basic model");
+  addsaver(conformal::use_atan, "use_atan");
 
   addsaver(vid.consider_shader_projection, "shader-projection", true);
 
diff --git a/conformal.cpp b/conformal.cpp
index ad8cda37..97ace6cc 100644
--- a/conformal.cpp
+++ b/conformal.cpp
@@ -389,6 +389,7 @@ namespace conformal {
   
   ld spiral_angle = 70, spiral_x = 10, spiral_y = 7;
   int spiral_id = 7;
+  bool use_atan = false;
   
   cld spiral_multiplier;
   ld right_spiral_multiplier = 1;
@@ -741,6 +742,11 @@ namespace conformal {
         });
       }
 
+    if(pmodel == mdRotatedHyperboles) {
+      dialog::addBoolItem(XLAT("use atan to make it finite"), use_atan, 'x');
+      dialog::add_action([] () { use_atan = !use_atan; });
+      }
+
     if(pmodel == mdBall) {
       dialog::addSelItem(XLAT("projection in ball model"), fts3(vid.ballproj), 'x');
       dialog::add_action([] () {
diff --git a/hyper.h b/hyper.h
index a6951bea..1d39c339 100644
--- a/hyper.h
+++ b/hyper.h
@@ -1321,6 +1321,7 @@ namespace conformal {
   extern vector<cell*> movehistory;
   extern set<cell*> inmovehistory, inkillhistory, infindhistory;
   extern bool includeHistory;
+  extern bool use_atan;
   extern ld rotation;
   extern int do_rotate;
   extern ld model_orientation;
diff --git a/hypgraph.cpp b/hypgraph.cpp
index ab01775c..422568d7 100644
--- a/hypgraph.cpp
+++ b/hypgraph.cpp
@@ -539,8 +539,10 @@ void applymodel(hyperpoint H, hyperpoint& ret) {
       ret[1] = cosh(x) * factor;
       ret[2] = 0;
       
-      ret[0] = atan(ret[0]);
-      ret[1] = atan(ret[1]);
+      if(conformal::use_atan) {
+        ret[0] = atan(ret[0]);
+        ret[1] = atan(ret[1]);
+        }
 
       break;
       }