made keybd_subdir optional

config.cpp

@@ -1176,6 +1176,8 @@ EX void initConfig() {
   param_i(vid.faraway_highlight_color, "faraway_highlight_color", 50)
   -> editable(0, 100, 10, "faraway highlight color", "0 = monster color, 100 = red-light oscillation", 'c');
 
+  param_b(keybd_subdir_enabled, "keybd_subdir_enabled", 0)->editable("control the pushing direction with TAB", 'P')->help("If set, you control the off-hepetagon pushing direction with TAB. Otherwise, you control it by rotating the screen.");
+
   param_enum(glyphsortorder, parameter_names("glyph_sort", "glyph sort order"), glyphsortorder)
     ->editable({
       {"first on top", ""},

control.cpp

@@ -142,14 +142,17 @@ EX hyperpoint move_destination_vec(int d) {
   else return cspin(0, 2, d * 45._deg) * smalltangent();
   }
 
+EX int keybd_subdir = 1;
+EX bool keybd_subdir_enabled = 0;
+
 EX void movepckeydir(int d) {
   DEBB(DF_GRAPH, ("movepckeydir\n"));
   // EUCLIDEAN
 
   if(protect_memory()) return;
 
   movedir md = vectodir(move_destination_vec(d));
-  md.subdir = keybd_subdir ? 1 : -1;
+  if(keybd_subdir_enabled) md.subdir = keybd_subdir;
 
   if(!canmove) movepcto(md), remission(); else movepcto(md);
   }
@@ -620,7 +623,8 @@ EX void handleKeyNormal(int sym, int uni) {
     }
 
   if(sym == SDLK_TAB) {
-    keybd_subdir = !keybd_subdir;
+    keybd_subdir_enabled = !anyshiftclick;
+    keybd_subdir *= -1;
     }
 
   if(sym == SDLK_ESCAPE) {

graph.cpp

@@ -3597,9 +3597,8 @@ EX transmatrix applyDowndir(cell *c, const cellfunction& cf) {
   return ddspin180(c, patterns::downdir(c, cf));
   }
 
-EX bool keybd_subdir;
-
 void draw_movement_arrows(cell *c, const transmatrix& V, int df) {
+
   if(viewdists) return;
 
   string keylist = "";
@@ -3629,7 +3628,8 @@ void draw_movement_arrows(cell *c, const transmatrix& V, int df) {
 
       if((c->type & 1) && (isStunnable(c->monst) || isPushable(c->wall))) {
         transmatrix Centered = rgpushxto0(unshift(tC0(cwtV)));
-        int sd = keybd_subdir ? 1 : -1;
+        int sd = md.subdir;
+        if(keybd_subdir_enabled) sd = keybd_subdir;
 
         transmatrix T = iso_inverse(Centered) * rgpushxto0(Centered * tC0(V)) * lrspintox(Centered*tC0(V)) * spin(-sd * M_PI/S7) * xpush(0.2);
 

help.cpp

@@ -259,7 +259,7 @@ string pushtext(stringpar p) {
     "\n\nNote: when pushing %the1 off a heptagonal cell, you can control the pushing direction "
     "by clicking left or right half of the heptagon.", p);
 #if !ISMOBILE
-  s += XLAT(" With the keyboard, you can press Tab to invert the way the pushing direction leans.");
+  s += XLAT(" With the keyboard, you can press Tab to invert the way the pushing direction leans, or Shift+Tab to decide based on how the view is rotated.");
 #endif
   return s;
   }