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Damage and Movement

Discussion in 'Civ2 - Strategy & Tips' started by Prof. Garfield, Jun 4, 2019.

  1. Prof. Garfield

    Prof. Garfield Chieftain Supporter

    Joined:
    Mar 6, 2004
    Messages:
    2,062
    Location:
    Ontario
    I recently needed to find the calculation for a damaged unit's movement allowance for an event I want to write for a TOTPP with Lua scenario.

    https://www.civfanatics.com/civ2/strategy/combatguide/#basics was the only thing I could find, and that is only good when the road multiplier is 3.

    After some investigation, I believe I have found the correct calculation.

    h=remaining hitpoints for unit
    H=total hitpoints for unit
    M = total movement points for unit (multiplied by the road multiplier. I.e. in standard game horsemen have M=6)
    m = remaining movement points for unit (multiplied by the road multiplier)
    r = road multiplier (in TOTPP, this is the "aggregate" multiplier, i.e. the LCM of road,rail, and alpine)
    a % b is the "modulo" operator. That is divide a by b and take the remainder

    Computation:

    m* = floor(hM/H)
    if m* % r > 0 then m**=m*-m*%r+r
    otherwise, m**=m*

    If air unit, m = M
    If sea unit, m = max(2*r,m**) [unless M=0 or r]
    If land unit, m=max(r,m**) [unless M = 0]

    Basically, the unit's percent of total movement is its percent of total hp, rounding down for the division. Then, if the unit's movement allowance is not a multiple of the road multiplier (i.e. the "in game" movement would show a fraction movement allotment on a unit that hasn't moved), the movement allowance is increased to the next multiple of the road multiplier.

    My research has been done in Test of Time, though I'm pretty sure it holds for Classic/MGE as well. I'm fairly confident in my result, because it seems like the easiest way to program the functionality we observe (i.e. movement allowance is in "whole units," and proportional to remaining HP), but I couldn't figure out a way to automate the test with Lua.

    Here's the code for the calculation
    Code:
    -- returns movement allowance for a unit, multiplied by the road/rail multiplier
    function maxMoves(unit)
        local moveAllowance = (unit.hitpoints*unit.type.move)//unit.type.hitpoints
        local moveMult = totpp.movementMultipliers.aggregate
        if moveAllowance % moveMult > 0 then
            moveAllowance = moveAllowance - moveAllowance % moveMult + moveMult
        end
        if unit.type.domain == 0 then
            return math.min(math.max( moveAllowance,moveMult),unit.type.move)
        elseif unit.type.domain == 1 then
            return unit.type.move
        elseif unit.type.domain == 2 then
            return math.min(math.max( moveAllowance,2*moveMult),unit.type.move)
        else
    
        end
    end
    
    
     

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