Feature: setting to indicate snow coverage for arctic climate (replaces snow line height)

Setting the snow coverage (in % of the map) makes a lot more sense
to the human, while still allowing the niche player to set (by
finding the correct %) a snow line height they like. This makes for
easier defaults, as it decoupled terrain height from amount of snow.

Maps can never be 100% snow, as we do not have sprites for coastal
tiles.

Internally, this calculates the best snow line height to approach
this coverage as close as possible.

1 files changed, 9 insertions, 5 deletions

diff --git a/src/lang/english.txt b/src/lang/english.txt
index 1837e143e..be1d50427 100644
--- a/src/lang/english.txt
+++ b/src/lang/english.txt
@@ -1351,7 +1351,10 @@ STR_CONFIG_SETTING_INDUSTRY_DENSITY_HELPTEXT                    :Set how many in
 STR_CONFIG_SETTING_OIL_REF_EDGE_DISTANCE                        :Maximum distance from edge for Oil industries: {STRING2}
 STR_CONFIG_SETTING_OIL_REF_EDGE_DISTANCE_HELPTEXT               :Limit for how far from the map border oil refineries and oil rigs can be constructed. On island maps this ensures they are near the coast. On maps larger than 256 tiles, this value is scaled up.
 STR_CONFIG_SETTING_SNOWLINE_HEIGHT                              :Snow line height: {STRING2}
-STR_CONFIG_SETTING_SNOWLINE_HEIGHT_HELPTEXT                     :Control at what height snow starts in sub-arctic landscape. Snow also affects industry generation and town growth requirements
+STR_CONFIG_SETTING_SNOWLINE_HEIGHT_HELPTEXT                     :Controls at what height snow starts in sub-arctic landscape. Snow also affects industry generation and town growth requirements. Can only be modified via Scenario Editor or is otherwise calculated via "snow coverage"
+STR_CONFIG_SETTING_SNOW_COVERAGE                                :Snow coverage: {STRING2}
+STR_CONFIG_SETTING_SNOW_COVERAGE_HELPTEXT                       :Controls the approximate amount of snow on the sub-arctic landscape. Snow also affects industry generation and town growth requirements. Only used during map generation. Land just above sea level is always without snow
+STR_CONFIG_SETTING_SNOW_COVERAGE_VALUE                          :{NUM}%
 STR_CONFIG_SETTING_ROUGHNESS_OF_TERRAIN                         :Roughness of terrain: {STRING2}
 STR_CONFIG_SETTING_ROUGHNESS_OF_TERRAIN_HELPTEXT                :(TerraGenesis only) Choose the frequency of hills: Smooth landscapes have fewer, more wide-spread hills. Rough landscapes have many hills, which may look repetitive
 STR_CONFIG_SETTING_ROUGHNESS_OF_TERRAIN_VERY_SMOOTH             :Very Smooth
@@ -2895,9 +2898,10 @@ STR_MAPGEN_NUMBER_OF_INDUSTRIES                                 :{BLACK}No. of i
 STR_MAPGEN_MAX_HEIGHTLEVEL                                      :{BLACK}Maximum map height:
 STR_MAPGEN_MAX_HEIGHTLEVEL_UP                                   :{BLACK}Increase the maximum height of mountains on the map by one
 STR_MAPGEN_MAX_HEIGHTLEVEL_DOWN                                 :{BLACK}Decrease the maximum height of mountains on the map by one
-STR_MAPGEN_SNOW_LINE_HEIGHT                                     :{BLACK}Snow line height:
-STR_MAPGEN_SNOW_LINE_UP                                         :{BLACK}Move the snow line height one up
-STR_MAPGEN_SNOW_LINE_DOWN                                       :{BLACK}Move the snow line height one down
+STR_MAPGEN_SNOW_COVERAGE                                        :{BLACK}Snow coverage:
+STR_MAPGEN_SNOW_COVERAGE_UP                                     :{BLACK}Increase snow coverage by ten percent
+STR_MAPGEN_SNOW_COVERAGE_DOWN                                   :{BLACK}Decrease snow coverage by ten percent
+STR_MAPGEN_SNOW_COVERAGE_TEXT                                   :{BLACK}{NUM}%
 STR_MAPGEN_LAND_GENERATOR                                       :{BLACK}Land generator:
 STR_MAPGEN_TERRAIN_TYPE                                         :{BLACK}Terrain type:
 STR_MAPGEN_QUANTITY_OF_SEA_LAKES                                :{BLACK}Sea level:
@@ -2924,7 +2928,7 @@ STR_MAPGEN_HEIGHTMAP_SIZE_LABEL                                 :{BLACK}Size:
 STR_MAPGEN_HEIGHTMAP_SIZE                                       :{ORANGE}{NUM} x {NUM}
 
 STR_MAPGEN_MAX_HEIGHTLEVEL_QUERY_CAPT                           :{WHITE}Change maximum map height
-STR_MAPGEN_SNOW_LINE_QUERY_CAPT                                 :{WHITE}Change snow line height
+STR_MAPGEN_SNOW_COVERAGE_QUERY_CAPT                             :{WHITE}Snow coverage (in %)
 STR_MAPGEN_START_DATE_QUERY_CAPT                                :{WHITE}Change starting year
 
 # SE Map generation