Shannon V. OKeets
Posts: 22095
Joined: 5/19/2005
From: Honolulu, Hawaii
Status: offline
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Overruns can be done by any land combat unit - against hexes occupied by enemy air and/or naval units.
Adding in even more conditionals to whether supply should be recalculated when a land unit moves would not be a good thing - from the programmer's perspective.
The routine that makes this determination is 2350 lines long. Here is my in-line comment on what it does. Note that towards the end, I got tired of looking up the name of the individual routines that perform the work and just used ??????? as the procedure/function name.
===
// ****************************************************************************
// Variables that control when supply is recalcuated.
// ****************************************************************************
// SupplyExecutedOnce is set to True when supply is calculated from scratch.
// That forces the full execution of UnitMenuSupplySources when creating a new
// game or restoring a saved game.
// Thereafter, the routines LeaveMapHex and EnterMapHex call EvalSup routines
// based on the unit type and whether the hex the unit is leaving/entering is an
// all-sea or a land hex. SetHexControl calls EvalSupHexControlChange to
// process changes in hex control which affects which units can use a given hex
// in a supply path.
//
// The EvalSup routines set Eval Supply flags (e.g., EvalInSupplyAxisLand):
// (1) to validate overland supply paths for in-supply units on a side,
// (2) to validate overseas supply paths for in-supply units on a side,
// (3) to search for overland supply paths for OOS units on a side,
// (4) to search for overseas supply paths for OOS units on a side, and
// (5) to execute FindSupplyPathForStack for the moving units.
//
// The last of the above is executed for the units in the moving stack if their
// destination is a land hex, since a new supply path has to be found for them.
//
// The routines that initiate calls to LeaveMapHex/EnterMapHex, or cause changes
// in hex control (e.g., Conquest), post-process those calls by executing
// UnitMenuSupplySources, part or all of which executes, depending on which
// flags were set to True.
// ****************************************************************************
//
// ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
//
// ****************************************************************************
// FindSupplyPathU(U, False) updates an individual unit's supply.
// FindSupplyPathForStack updates supply for all units in a hex which are OOS.
// ValidateHex determines if a hex is valid/invalid for a major power to use in
// a supply path.
// ValidateSeaArea checks if a sea area has changed between valid/invalid for a
// major power to use in a supply path.
//
// SupplyUpToDateAxis & SupplyUpToDateAllied is set to False when:
// 1 - In the Weather phase, if the weather changes in any weather zone.
// 2 - Units enter or leave a hex.
// 3 - At the end of phases where large blocks of territory change control:
// Declaration of war [TMajorCountry.DeclareWar].
// Claim of minor country territory [TCountryTable.Conquer],
// OccupyBalticStatesEffects, OccupyEasternPolandEffects,
// CheckBorderRectification, [TMinorCountry.Peace]
// Alignment of a minor country [TMajorCountry.AlignCountry].
// US Entry - control of territory may change:
// OccupyGreenlandIcelandEffects, OccupyNorthernIrelandEffects.
// Conquest [TCountryTable.Conquer].
// Surrender [TCountryTable.Conquer].
// Liberation [TMajorCountry.Liberate].
// Declaration of Vichy France [CreateVichyFr].
// Collapse of Vichy France [TCountryTable.CollapseVichyFrance].
// Ukraine.
// Mutual peace.
// 4 - Computing odds ratio for Notional units.
// ****************************************************************************
//
// ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
//
// ****************************************************************************
// When EvalOSSAxisLand or EvalOSSAlliedLand is True, execute
// FindRailwaySupplyPath & FindBasicSupplyPath3rd2nd to check if supply sources
// previously OOS are now in supply. Then execute FindSupplyPathU to check if
// units previously OOS are now in supply.
//
// When EvalInSupplyAxisLand or EvalInSupplyAlliedLand is True, execute
// TrySavedPath2nd1st and TrySavedPath3rd2nd to check if a supply source
// previously in supply can still use its old path, and execute TrySavedPathUnit
// to check if a unit previously in supply can still use its old path. If
// either fails execute FindRailwaySupplyPath & FindBasicSupplyPath3rd2nd to
// check if the supply sources can find new paths, and execute FindSupplyPathU
// to check if units can find new paths.
//
// When EvalOSSAxisSea or EvalOSSAlliedSea is True, execute ????????? to see if
// supply sources and/or units that were previously in supply are now OOS.
//
// When EvalInSupplyAxisSea or EvalInSupplyAlliedSea is True, execute ?????????
// to see if supply sources and/or units that were previously OOS are now in
// supply.
EDIT: Note that changing control of a single land hex could affect supply paths for units needing to go overseas to find supply. For instance, cutting off a path to a port could put an HQ out of supply and that could have a ripple effect on whole swaths of other secondary/tertiary supply sources and/or units.
< Message edited by Shannon V. OKeets -- 9/15/2019 7:57:19 PM >
_____________________________
Steve
Perfection is an elusive goal.
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