Fog and mist weather

data/json/weather_type.json

@@ -269,6 +269,76 @@
       ]
     }
   },
+  {
+    "id": "mist",
+    "type": "weather_type",
+    "name": "Mist",
+    "color": "light_gray",
+    "map_color": "dark_gray_white",
+    "sym": "~",
+    "ranged_penalty": 3,
+    "sight_penalty": 1.3,
+    "light_modifier": -20,
+    "sun_multiplier": 0.3,
+    "sound_attn": 0,
+    "dangerous": false,
+    "precip": "none",
+    "rains": false,
+    "sound_category": "silent",
+    "priority": 20,
+    "required_weathers": [ "clear", "sunny" ],
+    "condition": {
+      "and": [
+        { "math": [ "u_val( 'weather:windpower' )", "<", "12" ] },
+        { "math": [ "u_val( 'weather:windpower' )", ">", "0" ] },
+        { "math": [ "dew_point_factor", "<", "5" ] }
+      ]
+    }
+  },
+  {
+    "id": "fog",
+    "type": "weather_type",
+    "name": "Fog",
+    "color": "light_gray",
+    "map_color": "dark_gray_white",
+    "sym": "~",
+    "ranged_penalty": 7,
+    "sight_penalty": 1.7,
+    "light_modifier": -40,
+    "sun_multiplier": 0.3,
+    "sound_attn": 0,
+    "dangerous": false,
+    "precip": "none",
+    "rains": false,
+    "sound_category": "silent",
+    "priority": 20,
+    "required_weathers": [ "mist" ],
+    "condition": {
+      "and": [
+        { "math": [ "u_val( 'weather:windpower' )", "<", "12" ] },
+        { "math": [ "u_val( 'weather:windpower' )", ">", "0" ] },
+        { "math": [ "dew_point_factor", "<=", "2.5" ] }
+      ]
+    }
+  },
+  {
+    "type": "effect_on_condition",
+    "id": "EOC_DEW_POINT_FACTOR",
+    "recurrence": [ "15 minutes", "30 minutes" ],
+    "//": "First and second math calculate the dew point, the third calculate how close the weather to the point it can form a fog",
+    "//2": "dew_point_factor is a difference between actual temperature and the dew point.  the closer it gets to zero, the bigger probability to cause a mist or dew, starting somewhere from 2,5 centigrade or 5 fahrenheit, to zero",
+    "effect": [
+      {
+        "math": [
+          "dprhx",
+          "=",
+          "log ( u_val( 'weather:humidity' ) / 100 ) + 17.625 * u_val( 'weather:temperature' ) / ( 469.5 + u_val( 'weather:temperature' ) )"
+        ]
+      },
+      { "math": [ "dew_point", "=", "469.5 * dprhx / ( 17.625 - dprhx )" ] },
+      { "math": [ "dew_point_factor", "=", "u_val('weather: temperature') - ( dew_point )" ] }
+    ]
+  },
   {
     "id": "early_portal_storm",
     "type": "weather_type",

tests/bionics_test.cpp

@@ -13,6 +13,7 @@
 #include "item_pocket.h"
 #include "map_helpers.h"
 #include "npc.h"
+#include "options_helpers.h"
 #include "pimpl.h"
 #include "player_helpers.h"
 #include "ret_val.h"
@@ -537,6 +538,7 @@ TEST_CASE( "fueled bionics", "[bionics] [item]" )
         // Midday for solar test
         clear_map();
         g->reset_light_level();
+        scoped_weather_override weather_clear( WEATHER_CLEAR );
         calendar::turn = calendar::turn_zero + 12_hours;
         REQUIRE( g->is_in_sunlight( dummy.pos() ) );
 

tests/char_sight_test.cpp

@@ -10,6 +10,7 @@
 #include "lightmap.h"
 #include "map.h"
 #include "map_helpers.h"
+#include "options_helpers.h"
 #include "player_helpers.h"
 #include "type_id.h"
 
@@ -55,6 +56,7 @@ TEST_CASE( "light and fine_detail_vision_mod", "[character][sight][light][vision
     clear_avatar();
     clear_map();
     g->reset_light_level();
+    scoped_weather_override weather_clear( WEATHER_CLEAR );
 
     SECTION( "full daylight" ) {
         // Set clock to noon
@@ -117,6 +119,7 @@ TEST_CASE( "character sight limits", "[character][sight][vision]" )
     clear_avatar();
     clear_map();
     g->reset_light_level();
+    scoped_weather_override weather_clear( WEATHER_CLEAR );
 
     GIVEN( "it is midnight with a new moon" ) {
         calendar::turn = calendar::turn_zero;
@@ -212,6 +215,7 @@ TEST_CASE( "ursine vision", "[character][ursine][vision]" )
     clear_avatar();
     clear_map();
     g->reset_light_level();
+    scoped_weather_override weather_clear( WEATHER_CLEAR );
 
     float light_here = 0.0f;
 

tests/vision_test.cpp

@@ -19,6 +19,7 @@
 #include "map_test_case.h"
 #include "mapdata.h"
 #include "mtype.h"
+#include "options_helpers.h"
 #include "point.h"
 #include "type_id.h"
 #include "units.h"
@@ -157,6 +158,7 @@ struct vision_test_case {
         player_character.clear_moncams();
         clear_map( -2, OVERMAP_HEIGHT );
         g->reset_light_level();
+        scoped_weather_override weather_clear( WEATHER_CLEAR );
 
         REQUIRE( !player_character.is_blind() );
         REQUIRE( !player_character.in_sleep_state() );
@@ -534,40 +536,49 @@ TEST_CASE( "vision_single_tile_skylight", "[shadowcasting][vision]" )
 TEST_CASE( "vision_junction_reciprocity", "[vision][reciprocity]" )
 {
     bool player_in_junction = GENERATE( true, false );
+    CAPTURE( player_in_junction );
 
     vision_test_case t {
         player_in_junction ?
         std::vector<std::string>{
-            "u#  ",
-            "-- Z",
+            "###   ",
+            "#u####",
+            "#---z#",
+            "######",
 }:
         std::vector<std::string>{
-            "z#  ",
-            "-- u",
+            "###   ",
+            "#z####",
+            "#---u#",
+            "######",
         },
         player_in_junction ?
         std::vector<std::string>{
-            "4466",
-            "4446",
+            "444666",
+            "444666",
+            "444466",
+            "444466",
 }:
         std::vector<std::string>{
-            "4444",
-            "4444",
+            "666666",
+            "444444",
+            "444444",
+            "444444",
         },
         day_time
     };
 
     monster *zombie = nullptr;
     tile_predicate spawn_zombie = [&]( map_test_case::tile tile ) {
         zombie = g->place_critter_at( mon_zombie, tile.p );
+        get_map().ter_set( tile.p + tripoint_above, ter_t_flat_roof );
         return true;
     };
 
     t.set_up_tiles =
-        ifchar( 'C', spawn_moncam ) ||
-        ifchar( 'Z', spawn_zombie ) ||
         ifchar( 'z', spawn_zombie ) ||
         t.set_up_tiles;
+    t.flags.headlamp = true;
     t.test_all();
 
     if( player_in_junction ) {