(svn r12590) [NoAI] -Add: EnforcePrecondition macro to make code much better readable.
/* $Id$ */
/** @file ai_bridge.cpp Implementation of AIBridge. */
#include "ai_bridge.hpp"
#include "../../bridge.h"
#include "../../bridge_map.h"
#include "../../strings_func.h"
#include "../../core/alloc_func.hpp"
#include "../../economy_func.h"
#include "../../settings_type.h"
#include "../../road_map.h"
#include "table/strings.h"
/* static */ bool AIBridge::IsValidBridge(BridgeID bridge_id)
{
return bridge_id < MAX_BRIDGES;
}
/* static */ bool AIBridge::IsBridgeTile(TileIndex tile)
{
return ::IsBridgeTile(tile);
}
/* static */ bool AIBridge::BuildBridge(AIVehicle::VehicleType vehicle_type, BridgeID bridge_id, TileIndex start, TileIndex end)
{
EnforcePrecondition(false, start != end);
EnforcePrecondition(false, ::IsValidTile(start) && ::IsValidTile(end));
EnforcePrecondition(false, TileX(start) == TileX(end) || TileY(start) == TileY(end));
EnforcePrecondition(false, vehicle_type == AIVehicle::VEHICLE_ROAD || vehicle_type == AIVehicle::VEHICLE_RAIL);
uint type = 0;
if (vehicle_type == AIVehicle::VEHICLE_ROAD) {
type |= (TRANSPORT_ROAD << 15);
type |= (ROADTYPES_ROAD << 8);
} else {
type |= (TRANSPORT_RAIL << 15);
type |= (RAILTYPES_RAIL << 8);
}
return AIObject::DoCommand(end, start, type | bridge_id, CMD_BUILD_BRIDGE);
}
/* static */ bool AIBridge::RemoveBridge(TileIndex tile)
{
EnforcePrecondition(false, IsBridgeTile(tile));
return AIObject::DoCommand(tile, 0, 0, CMD_LANDSCAPE_CLEAR);
}
/* static */ char *AIBridge::GetName(BridgeID bridge_id)
{
if (!IsValidBridge(bridge_id)) return NULL;
static const int len = 64;
char *bridge_name = MallocT<char>(len);
::GetString(bridge_name, ::GetBridgeSpec(bridge_id)->transport_name[0], &bridge_name[len - 1]);
return bridge_name;
}
/* static */ uint32 AIBridge::GetMaxSpeed(BridgeID bridge_id)
{
if (!IsValidBridge(bridge_id)) return 0;
return ::GetBridgeSpec(bridge_id)->speed;
}
/* static */ uint32 AIBridge::GetPrice(BridgeID bridge_id, uint length)
{
if (!IsValidBridge(bridge_id)) return 0;
return length * _price.build_bridge * ::GetBridgeSpec(bridge_id)->price >> 8;
}
/* static */ uint32 AIBridge::GetMaxLength(BridgeID bridge_id)
{
if (!IsValidBridge(bridge_id)) return 0;
uint max = ::GetBridgeSpec(bridge_id)->max_length;
if (max >= 16 && _patches.longbridges) max = 100;
return max + 2;
}
/* static */ uint32 AIBridge::GetMinLength(BridgeID bridge_id)
{
if (!IsValidBridge(bridge_id)) return 0;
return ::GetBridgeSpec(bridge_id)->min_length + 2;
}
/* static */ int32 AIBridge::GetYearAvailable(BridgeID bridge_id)
{
if (!IsValidBridge(bridge_id)) return 0;
return ::GetBridgeSpec(bridge_id)->avail_year;
}