From 9af2566e5f35c5357748a533143cac5b1c618d87 Mon Sep 17 00:00:00 2001
From: Zeno Rogue <zeno@attnam.com>
Date: Sun, 25 Mar 2018 15:27:42 +0200
Subject: [PATCH] lower halfplane model added

---
 config.cpp    |  1 +
 conformal.cpp | 19 ++++++-------------
 hyper.h       |  1 +
 hypgraph.cpp  | 10 ++++++++--
 menus.cpp     |  2 +-
 5 files changed, 17 insertions(+), 16 deletions(-)

diff --git a/config.cpp b/config.cpp
index 93a70bb0..dc9c7d5e 100644
--- a/config.cpp
+++ b/config.cpp
@@ -294,6 +294,7 @@ void initConfig() {
   addsaver(conformal::bandsegment, "band segment");
   addsaver(conformal::rotation, "conformal rotation");
   addsaver(conformal::do_rotate, "conformal rotation mode", 1);
+  addsaver(conformal::lower_halfplane, "lower halfplane", false);
   addsaver(conformal::autoband, "automatic band");
   addsaver(conformal::autobandhistory, "automatic band history");
   addsaver(conformal::dospiral, "do spiral");
diff --git a/conformal.cpp b/conformal.cpp
index 2c6c8bf5..e1c90c61 100644
--- a/conformal.cpp
+++ b/conformal.cpp
@@ -274,6 +274,7 @@ namespace conformal {
   int bandsegment = 16000;
   ld rotation = 0;
   int do_rotate = 1;
+  bool lower_halfplane;
   bool autoband = false;
   bool autobandhistory = false;
   bool dospiral = true;
@@ -529,19 +530,6 @@ namespace conformal {
     }
 #endif
 
-  const char* directions[MODELCOUNT][4] = {
-     { "right", "up", "left", "down" },
-     { "counterclockwise", "zoom out", "clockwise", "zoom in" },
-     { "left to right", "spin down", "right to left", "spin up" },
-     { "right", "up", "left", "down" },
-     { "right", "up", "left", "down" },
-     { "right", "up", "left", "down" },
-     { "right", "up", "left", "down" },
-     { "right", "up", "left", "down" },
-     { "right", "up", "left", "down" },
-     { "right", "up", "left", "down" }
-     };
-     
   const char *modelnames[MODELCOUNT] = {
     "disk", "half-plane", "band", "polygonal", "polynomial",
     "azimuthal equidistant", "azimuthal equi-area", 
@@ -607,6 +595,9 @@ namespace conformal {
       dialog::addSelItem(XLAT("which coefficient"), its(polygonal::coefid), 'n');
       }
 
+    if(pmodel == mdHalfplane)
+      dialog::addBoolItem(XLAT("lower half-plane"), lower_halfplane, 'l');
+
     if(pmodel == mdBall)
       dialog::addSelItem(XLAT("projection in ball model"), fts3(vid.ballproj), 'x');
 
@@ -652,6 +643,8 @@ namespace conformal {
         config_camera_rotation();
       else if(uni == 'u')
         pushScreen(rug::show);
+      else if(uni == 'l' && pmodel == mdHalfplane)
+        lower_halfplane = !lower_halfplane;
       else if(uni == 'a')
         pushScreen(history_menu);
       else if(uni == 'l')  {
diff --git a/hyper.h b/hyper.h
index 80adb4f1..5e3718c3 100644
--- a/hyper.h
+++ b/hyper.h
@@ -899,6 +899,7 @@ namespace conformal {
   extern bool includeHistory;
   extern ld rotation;
   extern int do_rotate;
+  extern bool lower_halfplane;
   extern bool autoband;
   extern bool autobandhistory;
   extern bool dospiral;
diff --git a/hypgraph.cpp b/hypgraph.cpp
index bd5b9916..be09bcc6 100644
--- a/hypgraph.cpp
+++ b/hypgraph.cpp
@@ -241,16 +241,22 @@ void applymodel(hyperpoint H, hyperpoint& ret) {
   ld x0, y0;  
   x0 = H[0] / tz;
   y0 = H[1] / tz;
+  if(conformal::lower_halfplane) x0 = -x0, y0 = -y0;
   y0 += 1;
   double rad = x0*x0 + y0*y0;
   y0 /= rad;
   x0 /= rad;
   y0 -= .5;
+
+  if(conformal::lower_halfplane) x0 = -x0, y0 = -y0;
   
   if(pmodel == mdHalfplane) {
     ret[0] = x0;
-    if(wmspatial || mmspatial) y0 *= zlev;
-    ret[1] = 1 - y0;
+    if(wmspatial || mmspatial) {
+      if(conformal::lower_halfplane) y0 /= zlev;
+      else y0 *= zlev;
+      }
+    ret[1] = (conformal::lower_halfplane?-1:1) - y0;
     ret[2] = 0;
     if(zlev != 1 && stereo::active()) 
       apply_depth(ret, -y0 * geom3::factor_to_lev(zlev));
diff --git a/menus.cpp b/menus.cpp
index faa6b190..698e49b3 100644
--- a/menus.cpp
+++ b/menus.cpp
@@ -306,7 +306,7 @@ void showMainMenu() {
 void editScale() {
   dialog::editNumber(vid.scale, .001, 1000, .1, 1, XLAT("scale factor"), 
     XLAT("Scale the displayed model."));
-  dialog::scaleLog();
+  dialog::scaleSinh();
   }
 
 void showDisplayMode() {