Problem with trade routes through "canals"

[j_mie6]

So, in my mod I have an improvement called a canal, and it allows any naval unit through, in order to lake jump etc. If I lay out a canal and set a trireme to auto explore it will pathfind through the canals, quite happily.

But if I try and set up a trade route between two oceans connected via a canal (the same canal the triremes will happily travel through), it will not display the trade route as valid and I can't make it.

So my question is; Where can I make it so that pathfinding for trade routes takes into account any improvement that ActsAsCanal() when working out if a route is valid?

Thanks,
Jamie

 

[j_mie6]

any ideas?

 

[Ethidium]

Hi, I've wanted this feature for a while - did you ever find a solution?

 

[j_mie6]

I'm not sure, I might have done. But it has been a while since I've been able to look at any Civ code

 

[whoward69]

My DLL and the CP DLL address (and solve) this issue

 

[ThorHammerz]

More specifically (in case you want to do this with your own DLL), you are going to need to modify within the file CvAStar.cpp the function

int TradeRouteWaterValid(CvAStarNode* parent, CvAStarNode* node, int data, const void* pointer, CvAStar* finder)

replacing the condition that checks for a plot city with a condition that checks for improvements (and possible canal attribute).

#ifdef Your_Mod_Define
	if (!pNewPlot->isCity() && !pNewPlot->isActAsCanal())
#else
	if (!pNewPlot->isCity())
#endif

 

[whoward69]

There are three places you need to make changes in CvAStar.cpp, TWO in TradeRouteWaterValid and ONE in TradeRouteWaterPathCost