Implement two-part drawing for force cages

- Also a missing check for them

osx/boe.graphics.cpp

@@ -809,6 +809,8 @@ ter_num_t get_ter_from_ground(unsigned char ground){
 	return 0;
 }
 
+std::vector<location> forcecage_locs;
+
 void draw_terrain(short	mode)
 //mode ... if 1, don't place on screen after redoing
 // if 2, only redraw over active monst
@@ -1029,6 +1031,10 @@ void draw_terrain(short	mode)
 		draw_party_symbol(center);
 	else if (overall_mode != MODE_LOOK_TOWN)
 		draw_pcs(center,0);
+	// Draw top half of forcecages (this list is populated by draw_fields)
+	// TODO: Move into the above loop to eliminate global variable
+	for(location fc_loc : forcecage_locs)
+		Draw_Some_Item(fields_gworld,calc_rect(2,0),terrain_screen_gworld,fc_loc,1,0);
 	
 	// Now do the light mask thing
 	apply_light_mask(false);

osx/boe.graphutil.cpp

@@ -471,6 +471,8 @@ void draw_town_boat(location center)
 			}
 }
 
+extern std::vector<location> forcecage_locs;
+
 void draw_fields(location where){
 	if(!point_onscreen(center,where)) return;
 	if(party_can_see(where) >= 6) return;
@@ -525,8 +527,10 @@ void draw_fields(location where){
 		Draw_Some_Item(fields_gworld,calc_rect(6,3),terrain_screen_gworld,where_draw,1,0);
 	if(univ.town.is_rubble(where.x,where.y))
 		Draw_Some_Item(fields_gworld,calc_rect(7,3),terrain_screen_gworld,where_draw,1,0);
-	if(univ.town.is_force_cage(where.x,where.y))
-		Draw_Some_Item(fields_gworld,calc_rect(2,0),terrain_screen_gworld,where_draw,1,0);
+	if(univ.town.is_force_cage(where.x,where.y)) {
+		Draw_Some_Item(fields_gworld,calc_rect(1,0),terrain_screen_gworld,where_draw,1,0);
+		forcecage_locs.push_back(where_draw);
+	}
 }
 
 void draw_party_symbol(location center) {

osx/boe.text.cpp

@@ -891,6 +891,8 @@ short do_look(location space)
 			add_string_to_buf("    Ice Wall               ");
 		if (univ.town.is_blade_wall(space.x,space.y))
 			add_string_to_buf("    Blade Wall               ");
+		if (univ.town.is_force_cage(space.x,space.y))
+			add_string_to_buf("    Force Cage               ");
 		
 		if (univ.town.is_sm_blood(space.x,space.y))
 			add_string_to_buf("    Blood stain               ");