ads-game:: show the (approximate) future

rogueviz/ads/control.cpp

@@ -118,6 +118,7 @@ bool ads_turn(int idelta) {
       current_ship = current;
       vctr_ship = vctr;
       vctrV_ship = vctrV;
+      vctr_ship_base = hybrid::get_where(vctr_ship).first;
       view_pt = 0;
       }
     else {

rogueviz/ads/display.cpp

@@ -152,6 +152,24 @@ void draw_game_cell(cell *cs, ads_matrix V, ld plev) {
     queuecurve(shiftless(Id), 0xFF, shipcolor, PPR::LINE);
     }
   
+  if(paused && c == vctr_ship_base && !game_over) {
+    vector<hyperpoint> pts;
+    vector<ld> times;
+    int ok = 0, bad = 0;
+    for(int i=0; i<=360; i++) {
+      hybrid::in_actual([&]{
+        auto h = ads_inverse(current_ship * vctrV_ship) * spin(i*degree) * lorentz(0, 2, 6);
+        auto cr = cross0(current * V * h);
+        pts.push_back(cr.h);
+        times.push_back(cr.shift);
+        if(cr.shift > 0 && cr.shift < 90*degree) ok++; else bad++;
+        });
+      }
+    if(bad == 0) {
+      for(auto h: pts) curvepoint(h);
+      queuecurve(shiftless(Id), 0x000000C0, 0x00000060, PPR::SUPERLINE);
+      }
+    }
   }
 
 void view_ads_game() {

rogueviz/ads/globals.cpp

@@ -23,6 +23,9 @@ ads_matrix current_ship;
 /** SL cell closest to the current view/ship */
 cell *vctr, *new_vctr, *vctr_ship;
 
+/** hyperbolic cell closest to the current view/ship */
+cell *vctr_ship_base;
+
 /** world coordinates of vctr -- technically, this is a shiftmatrix */
 ads_matrix vctrV, new_vctrV, vctrV_ship;