trade route calculation?

[c2chanka]

Hello, I've seen some Trade Route formulas posted under the CIV2 forum, I'm just wondering if anyone knows the trade route formula for CTP2. Or maybe a hint on which cpp file I should search under

[J Bytheway]

Cursory investigation suggests that it's pretty simple. From TradeRouteData.cpp:

sint32 TradeRouteData::GetValue() const
{
	if(m_sourceRouteType != ROUTE_TYPE_RESOURCE)
		return 0;

	
	double baseValue = g_theWorld->GetGoodValue(m_sourceResource);
	double distance = double(m_destinationCity->GetCityData()->GetDistanceToGood(m_sourceResource));
	return sint32(baseValue * distance);
}

That GetDistanceToGood is in terms of least movement cost to the good (I'm not sure if this gets recalculated as more roads, etc. are built).

I guess this may be processed further (taking into account city populations, or something like that). I suggest you investigate - I guess you'd either want to look for calls to the above function or else work the other way from wherever the values get used (e.g. the trade screen).

[c2chanka]

Wow, what a fast reply!!! Thank you very much for your help. I will look into that file =)