/**
* Tries to create a passenger subsidy between two towns.
* @return True iff the subsidy was created.
*/
bool FindSubsidyPassengerRoute()
{
if (!Subsidy::CanAllocateItem()) return false;
Town *src = Town::GetRandom();
if (src->cache.population < SUBSIDY_PAX_MIN_POPULATION ||
src->GetPercentTransported(CT_PASSENGERS) > SUBSIDY_MAX_PCT_TRANSPORTED) {
return false;
}
const Town *dst = NULL;
if (CargoHasDestinations(CT_PASSENGERS)) {
/* Try to get a town from the demand destinations. */
CargoLink *link = src->GetRandomLink(CT_PASSENGERS, false);
if (link == src->cargo_links[CT_PASSENGERS].End()) return NULL;
if (link->dest != NULL && link->dest->GetType() != ST_TOWN) return NULL;
dst = static_cast<const Town *>(link->dest);
}
if (dst == NULL) dst = Town::GetRandom();
if (dst->cache.population < SUBSIDY_PAX_MIN_POPULATION || src == dst) {
return false;
}
if (DistanceManhattan(src->xy, dst->xy) > SUBSIDY_MAX_DISTANCE) return false;
if (CheckSubsidyDuplicate(CT_PASSENGERS, ST_TOWN, src->index, ST_TOWN, dst->index)) return false;
CreateSubsidy(CT_PASSENGERS, ST_TOWN, src->index, ST_TOWN, dst->index);
return true;
}
/**
* Tries to find a suitable destination for the given source and cargo.
* @param cid Subsidized cargo.
* @param src_type Type of \a src.
* @param src Index of source.
* @return True iff the subsidy was created.
*/
bool FindSubsidyCargoDestination(CargoID cid, SourceType src_type, SourceID src)
{
/* Choose a random destination. Only consider towns if they can accept the cargo. */
SourceType dst_type = (HasBit(_town_cargoes_accepted, cid) && Chance16(1, 2)) ? ST_TOWN : ST_INDUSTRY;
SourceID dst;
switch (dst_type) {
case ST_TOWN: {
/* Select a random town. */
const Town *dst_town = Town::GetRandom();
/* Check if the town can accept this cargo. */
if (!HasBit(dst_town->cargo_accepted_total, cid)) return false;
dst = dst_town->index;
break;
}
case ST_INDUSTRY: {
/* Select a random industry. */
const Industry *dst_ind = Industry::GetRandom();
/* The industry must accept the cargo */
if (dst_ind == NULL ||
(cid != dst_ind->accepts_cargo[0] &&
cid != dst_ind->accepts_cargo[1] &&
cid != dst_ind->accepts_cargo[2])) {
return false;
}
dst = dst_ind->index;
break;
}
default: NOT_REACHED();
}
/* Check that the source and the destination are not the same. */
if (src_type == dst_type && src == dst) return false;
/* Check distance between source and destination. */
if (!CheckSubsidyDistance(src_type, src, dst_type, dst)) return false;
/* Avoid duplicate subsidies. */
if (CheckSubsidyDuplicate(cid, src_type, src, dst_type, dst)) return false;
CreateSubsidy(cid, src_type, src, dst_type, dst);
return true;
}
/**
* Create a new subsidy.
* @param tile unused.
* @param flags type of operation
* @param p1 various bitstuffed elements
* - p1 = (bit 0 - 7) - SourceType of source.
* - p1 = (bit 8 - 23) - SourceID of source.
* - p1 = (bit 24 - 31) - CargoID of subsidy.
* @param p2 various bitstuffed elements
* - p2 = (bit 0 - 7) - SourceType of destination.
* - p2 = (bit 8 - 23) - SourceID of destination.
* @param text unused.
* @return the cost of this operation or an error
*/
CommandCost CmdCreateSubsidy(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
{
if (!Subsidy::CanAllocateItem()) return CMD_ERROR;
CargoID cid = GB(p1, 24, 8);
SourceType src_type = (SourceType)GB(p1, 0, 8);
SourceID src = GB(p1, 8, 16);
SourceType dst_type = (SourceType)GB(p2, 0, 8);
SourceID dst = GB(p2, 8, 16);
if (_current_company != OWNER_DEITY) return CMD_ERROR;
if (cid >= NUM_CARGO || !::CargoSpec::Get(cid)->IsValid()) return CMD_ERROR;
switch (src_type) {
case ST_TOWN:
if (!Town::IsValidID(src)) return CMD_ERROR;
break;
case ST_INDUSTRY:
if (!Industry::IsValidID(src)) return CMD_ERROR;
break;
default:
return CMD_ERROR;
}
switch (dst_type) {
case ST_TOWN:
if (!Town::IsValidID(dst)) return CMD_ERROR;
break;
case ST_INDUSTRY:
if (!Industry::IsValidID(dst)) return CMD_ERROR;
break;
default:
return CMD_ERROR;
}
if (flags & DC_EXEC) {
CreateSubsidy(cid, src_type, src, dst_type, dst);
}
return CommandCost();
}
/**
* Tries to create a passenger subsidy between two towns.
* @return True iff the subsidy was created.
*/
bool FindSubsidyPassengerRoute()
{
if (!Subsidy::CanAllocateItem()) return false;
const Town *src = Town::GetRandom();
if (src->cache.population < SUBSIDY_PAX_MIN_POPULATION ||
src->GetPercentTransported(CT_PASSENGERS) > SUBSIDY_MAX_PCT_TRANSPORTED) {
return false;
}
const Town *dst = Town::GetRandom();
if (dst->cache.population < SUBSIDY_PAX_MIN_POPULATION || src == dst) {
return false;
}
if (DistanceManhattan(src->xy, dst->xy) > SUBSIDY_MAX_DISTANCE) return false;
if (CheckSubsidyDuplicate(CT_PASSENGERS, ST_TOWN, src->index, ST_TOWN, dst->index)) return false;
CreateSubsidy(CT_PASSENGERS, ST_TOWN, src->index, ST_TOWN, dst->index);
return true;
}
/**
* Tries to find a suitable destination for the given source and cargo.
* @param cid Subsidized cargo.
* @param src_type Type of \a src.
* @param src Index of source.
* @return True iff the subsidy was created.
*/
bool FindSubsidyCargoDestination(CargoID cid, SourceType src_type, SourceID src)
{
/* Choose a random destination. Only consider towns if they can accept the cargo. */
SourceType dst_type = (HasBit(_town_cargoes_accepted, cid) && Chance16(1, 2)) ? ST_TOWN : ST_INDUSTRY;
CargoSourceSink *src_sink = (src_type == ST_TOWN) ? (CargoSourceSink *) Town::Get(src) : (CargoSourceSink *) Industry::Get(src);
SourceID dst;
switch (dst_type) {
case ST_TOWN: {
/* Select a random town. */
const Town *dst_town = NULL;
if (CargoHasDestinations(cid)) {
/* Try to get a town from the demand destinations. */
CargoLink *link = src_sink->GetRandomLink(cid, false);
if (link == src_sink->cargo_links[cid].End()) return NULL;
if (link->dest != NULL && link->dest->GetType() != dst_type) return NULL;
dst_town = static_cast<const Town *>(link->dest);
}
if (dst_town == NULL) dst_town = Town::GetRandom();
/* Check if the town can accept this cargo. */
if (!HasBit(dst_town->cargo_accepted_total, cid)) return false;
dst = dst_town->index;
break;
}
case ST_INDUSTRY: {
/* Select a random industry. */
const Industry *dst_ind = Industry::GetRandom();
if (CargoHasDestinations(cid)) {
/* Try to get a town from the demand destinations. */
CargoLink *link = src_sink->GetRandomLink(cid, false);
if (link == src_sink->cargo_links[cid].End()) return NULL;
if (link->dest != NULL && link->dest->GetType() != dst_type) return NULL;
dst_ind = static_cast<const Industry *>(link->dest);
}
if (dst_ind == NULL) dst_ind = Industry::GetRandom();
dst = dst_ind->index;
/* The industry must accept the cargo */
if (dst_ind == NULL || (src_type == dst_type && src == dst) ||
(cid != dst_ind->accepts_cargo[0] &&
cid != dst_ind->accepts_cargo[1] &&
cid != dst_ind->accepts_cargo[2])) {
return false;
}
break;
}
default: NOT_REACHED();
}
/* Check that the source and the destination are not the same. */
if (src_type == dst_type && src == dst) return false;
/* Check distance between source and destination. */
if (!CheckSubsidyDistance(src_type, src, dst_type, dst)) return false;
/* Avoid duplicate subsidies. */
if (CheckSubsidyDuplicate(cid, src_type, src, dst_type, dst)) return false;
CreateSubsidy(cid, src_type, src, dst_type, dst);
return true;
}
