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cuberite-2a/src/Entities/Minecart.cpp

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// Minecart.cpp
// Implements the cMinecart class representing a minecart in the world
// Handles physics when a minecart is on any type of rail (overrides simulator in Entity.cpp)
// Indiana Jones!
#include "Globals.h"
#include "Minecart.h"
#include "../BlockInfo.h"
#include "../ClientHandle.h"
#include "../Chunk.h"
#include "Player.h"
#include "../BoundingBox.h"
#include "../UI/MinecartWithChestWindow.h"
#define NO_SPEED 0.0
#define MAX_SPEED 8
#define MAX_SPEED_NEGATIVE -MAX_SPEED
class cMinecartCollisionCallback
{
public:
cMinecartCollisionCallback(Vector3d a_Pos, double a_Height, double a_Width, UInt32 a_UniqueID, UInt32 a_AttacheeUniqueID) :
m_DoesIntersect(false),
m_CollidedEntityPos(0, 0, 0),
m_Pos(a_Pos),
m_Height(a_Height),
m_Width(a_Width),
m_UniqueID(a_UniqueID),
m_AttacheeUniqueID(a_AttacheeUniqueID)
{
}
bool operator () (cEntity & a_Entity)
{
if (
(
!a_Entity.IsPlayer() ||
static_cast<cPlayer &>(a_Entity).IsGameModeSpectator() // Spectators doesn't collide with anything
) &&
!a_Entity.IsMob() &&
!a_Entity.IsMinecart() &&
!a_Entity.IsBoat()
)
{
return false;
}
else if ((a_Entity.GetUniqueID() == m_UniqueID) || (a_Entity.GetUniqueID() == m_AttacheeUniqueID))
{
return false;
}
cBoundingBox bbEntity(a_Entity.GetPosition(), a_Entity.GetWidth() / 2, a_Entity.GetHeight());
cBoundingBox bbMinecart(Vector3d(m_Pos.x, floor(m_Pos.y), m_Pos.z), m_Width / 2, m_Height);
if (bbEntity.DoesIntersect(bbMinecart))
{
m_CollidedEntityPos = a_Entity.GetPosition();
m_DoesIntersect = true;
return true;
}
return false;
}
bool FoundIntersection(void) const
{
return m_DoesIntersect;
}
Vector3d GetCollidedEntityPosition(void) const
{
return m_CollidedEntityPos;
}
protected:
bool m_DoesIntersect;
Vector3d m_CollidedEntityPos;
Vector3d m_Pos;
double m_Height, m_Width;
UInt32 m_UniqueID;
UInt32 m_AttacheeUniqueID;
};
////////////////////////////////////////////////////////////////////////////////
// cMinecart:
cMinecart::cMinecart(ePayload a_Payload, Vector3d a_Pos):
Super(etMinecart, a_Pos, 0.98, 0.7),
m_Payload(a_Payload),
m_LastDamage(0),
m_DetectorRailPosition(0, 0, 0),
m_bIsOnDetectorRail(false)
{
SetMass(20.0f);
SetGravity(-16.0f);
SetAirDrag(0.05f);
SetMaxHealth(6);
SetHealth(6);
}
void cMinecart::SpawnOn(cClientHandle & a_ClientHandle)
{
a_ClientHandle.SendSpawnEntity(*this);
a_ClientHandle.SendEntityMetadata(*this);
}
void cMinecart::HandlePhysics(std::chrono::milliseconds a_Dt, cChunk & a_Chunk)
{
ASSERT(IsTicking());
int PosY = POSY_TOINT;
if ((PosY <= 0) || (PosY >= cChunkDef::Height))
{
// Outside the world, just process normal falling physics
Super::HandlePhysics(a_Dt, a_Chunk);
BroadcastMovementUpdate();
return;
}
auto relPos = cChunkDef::AbsoluteToRelative(GetPosition());
auto chunk = a_Chunk.GetRelNeighborChunkAdjustCoords(relPos);
if (chunk == nullptr)
{
// Inside an unloaded chunk, bail out all processing
return;
}
BLOCKTYPE InsideType;
NIBBLETYPE InsideMeta;
chunk->GetBlockTypeMeta(relPos, InsideType, InsideMeta);
if (!IsBlockRail(InsideType))
{
// When a descending minecart hits a flat rail, it goes through the ground; check for this
chunk->GetBlockTypeMeta(relPos.addedY(1), InsideType, InsideMeta);
if (IsBlockRail(InsideType))
{
// Push cart upwards
AddPosY(1);
}
else
{
// When a minecart gets to a descending rail, it should go down.
chunk->GetBlockTypeMeta(relPos.addedY(-1), InsideType, InsideMeta);
if (IsBlockRail(InsideType))
{
// Push cart downwards
AddPosY(-1);
}
}
}
bool WasDetectorRail = false;
if (IsBlockRail(InsideType))
{
if (InsideType == E_BLOCK_RAIL)
{
SnapToRail(InsideMeta);
}
else
{
SnapToRail(InsideMeta & 0x07);
}
switch (InsideType)
{
case E_BLOCK_RAIL: HandleRailPhysics(InsideMeta, a_Dt); break;
case E_BLOCK_ACTIVATOR_RAIL: break;
case E_BLOCK_POWERED_RAIL: HandlePoweredRailPhysics(InsideMeta); break;
case E_BLOCK_DETECTOR_RAIL:
{
HandleDetectorRailPhysics(InsideMeta, a_Dt);
WasDetectorRail = true;
break;
}
default: VERIFY(!"Unhandled rail type despite checking if block was rail!"); break;
}
AddPosition(GetSpeed() * (static_cast<double>(a_Dt.count()) / 1000)); // Commit changes; as we use our own engine when on rails, this needs to be done, whereas it is normally in Entity.cpp
}
else
{
// Not on rail, default physics
SetPosY(floor(GetPosY()) + 0.35); // HandlePhysics overrides this if minecart can fall, else, it is to stop ground clipping minecart bottom when off-rail
Super::HandlePhysics(a_Dt, *chunk);
}
if (m_bIsOnDetectorRail && !Vector3i(POSX_TOINT, POSY_TOINT, POSZ_TOINT).Equals(m_DetectorRailPosition))
{
m_World->SetBlock(m_DetectorRailPosition, E_BLOCK_DETECTOR_RAIL, m_World->GetBlockMeta(m_DetectorRailPosition) & 0x07);
m_bIsOnDetectorRail = false;
}
else if (WasDetectorRail)
{
m_bIsOnDetectorRail = true;
m_DetectorRailPosition = Vector3i(POSX_TOINT, POSY_TOINT, POSZ_TOINT);
}
// Enforce speed limit:
m_Speed.Clamp(MAX_SPEED_NEGATIVE, MAX_SPEED);
// Broadcast positioning changes to client
BroadcastMovementUpdate();
}
void cMinecart::HandleRailPhysics(NIBBLETYPE a_RailMeta, std::chrono::milliseconds a_Dt)
{
/*
NOTE: Please bear in mind that taking away from negatives make them even more negative,
adding to negatives make them positive, etc.
*/
switch (a_RailMeta)
{
case E_META_RAIL_ZM_ZP: // NORTHSOUTH
{
SetYaw(270);
SetPosY(floor(GetPosY()) + 0.55);
SetSpeedY(0); // Don't move vertically as on ground
SetSpeedX(0); // Correct diagonal movement from curved rails
// Execute both the entity and block collision checks
auto BlckCol = TestBlockCollision(a_RailMeta);
auto EntCol = TestEntityCollision(a_RailMeta);
if (EntCol || BlckCol)
{
return;
}
if (GetSpeedZ() != NO_SPEED) // Don't do anything if cart is stationary
{
if (GetSpeedZ() > 0)
{
// Going SOUTH, slow down
ApplyAcceleration({ 0.0, 0.0, 1.0 }, -0.1);
}
else
{
// Going NORTH, slow down
ApplyAcceleration({ 0.0, 0.0, -1.0 }, -0.1);
}
}
return;
}
case E_META_RAIL_XM_XP: // EASTWEST
{
SetYaw(180);
SetPosY(floor(GetPosY()) + 0.55);
SetSpeedY(NO_SPEED);
SetSpeedZ(NO_SPEED);
auto BlckCol = TestBlockCollision(a_RailMeta);
auto EntCol = TestEntityCollision(a_RailMeta);
if (EntCol || BlckCol)
{
return;
}
if (GetSpeedX() != NO_SPEED)
{
if (GetSpeedX() > 0)
{
ApplyAcceleration({ 1.0, 0.0, 0.0 }, -0.1);
}
else
{
ApplyAcceleration({ -1.0, 0.0, 0.0 }, -0.1);
}
}
return;
}
case E_META_RAIL_ASCEND_ZM: // ASCEND NORTH
{
SetYaw(270);
SetSpeedX(0);
auto BlckCol = TestBlockCollision(a_RailMeta);
auto EntCol = TestEntityCollision(a_RailMeta);
if (EntCol || BlckCol)
{
return;
}
if (GetSpeedZ() >= 0)
{
// SpeedZ POSITIVE, going SOUTH
AddSpeedZ(0.5); // Speed up
SetSpeedY(-GetSpeedZ()); // Downward movement is negative (0 minus positive numbers is negative)
}
else
{
// SpeedZ NEGATIVE, going NORTH
AddSpeedZ(1); // Slow down
SetSpeedY(-GetSpeedZ()); // Upward movement is positive (0 minus negative number is positive number)
}
return;
}
case E_META_RAIL_ASCEND_ZP: // ASCEND SOUTH
{
SetYaw(270);
SetSpeedX(0);
auto BlckCol = TestBlockCollision(a_RailMeta);
auto EntCol = TestEntityCollision(a_RailMeta);
if (EntCol || BlckCol)
{
return;
}
if (GetSpeedZ() > 0)
{
// SpeedZ POSITIVE, going SOUTH
AddSpeedZ(-1); // Slow down
SetSpeedY(GetSpeedZ()); // Upward movement positive
}
else
{
// SpeedZ NEGATIVE, going NORTH
AddSpeedZ(-0.5); // Speed up
SetSpeedY(GetSpeedZ()); // Downward movement negative
}
return;
}
case E_META_RAIL_ASCEND_XM: // ASCEND EAST
{
SetYaw(180);
SetSpeedZ(NO_SPEED);
auto BlckCol = TestBlockCollision(a_RailMeta);
auto EntCol = TestEntityCollision(a_RailMeta);
if (EntCol || BlckCol)
{
return;
}
if (GetSpeedX() >= NO_SPEED)
{
AddSpeedX(0.5);
SetSpeedY(-GetSpeedX());
}
else
{
AddSpeedX(1);
SetSpeedY(-GetSpeedX());
}
return;
}
case E_META_RAIL_ASCEND_XP: // ASCEND WEST
{
SetYaw(180);
SetSpeedZ(0);
auto BlckCol = TestBlockCollision(a_RailMeta);
auto EntCol = TestEntityCollision(a_RailMeta);
if (EntCol || BlckCol)
{
return;
}
if (GetSpeedX() > 0)
{
AddSpeedX(-1);
SetSpeedY(GetSpeedX());
}
else
{
AddSpeedX(-0.5);
SetSpeedY(GetSpeedX());
}
return;
}
case E_META_RAIL_CURVED_ZM_XM: // Ends pointing NORTH and WEST
{
SetYaw(315); // Set correct rotation server side
SetPosY(floor(GetPosY()) + 0.55); // Levitate dat cart
SetSpeedY(0);
auto BlckCol = TestBlockCollision(a_RailMeta);
auto EntCol = TestEntityCollision(a_RailMeta);
if (EntCol || BlckCol)
{
return;
}
// SnapToRail handles turning
return;
}
case E_META_RAIL_CURVED_ZM_XP: // Curved NORTH EAST
{
SetYaw(225);
SetPosY(floor(GetPosY()) + 0.55);
SetSpeedY(0);
auto BlckCol = TestBlockCollision(a_RailMeta);
auto EntCol = TestEntityCollision(a_RailMeta);
if (EntCol || BlckCol)
{
return;
}
return;
}
case E_META_RAIL_CURVED_ZP_XM: // Curved SOUTH WEST
{
SetYaw(135);
SetPosY(floor(GetPosY()) + 0.55);
SetSpeedY(0);
auto BlckCol = TestBlockCollision(a_RailMeta);
auto EntCol = TestEntityCollision(a_RailMeta);
if (EntCol || BlckCol)
{
return;
}
return;
}
case E_META_RAIL_CURVED_ZP_XP: // Curved SOUTH EAST
{
SetYaw(45);
SetPosY(floor(GetPosY()) + 0.55);
SetSpeedY(0);
auto BlckCol = TestBlockCollision(a_RailMeta);
auto EntCol = TestEntityCollision(a_RailMeta);
if (EntCol || BlckCol)
{
return;
}
return;
}
}
UNREACHABLE("Unsupported rail meta type");
}
void cMinecart::HandlePoweredRailPhysics(NIBBLETYPE a_RailMeta)
{
// If the rail is powered set to speed up else slow down.
const bool IsRailPowered = ((a_RailMeta & 0x8) == 0x8);
const double Acceleration = IsRailPowered ? 1.0 : -2.0;
switch (a_RailMeta & 0x07)
{
case E_META_RAIL_ZM_ZP: // NORTHSOUTH
{
SetYaw(270);
SetPosY(floor(GetPosY()) + 0.55);
SetSpeedY(0);
SetSpeedX(0);
bool BlckCol = TestBlockCollision(a_RailMeta), EntCol = TestEntityCollision(a_RailMeta);
if (EntCol || BlckCol)
{
return;
}
if (GetSpeedZ() != NO_SPEED)
{
if (GetSpeedZ() > NO_SPEED)
{
ApplyAcceleration({ 0.0, 0.0, 1.0 }, Acceleration);
}
else
{
ApplyAcceleration({ 0.0, 0.0, -1.0 }, Acceleration);
}
}
// If rail is powered check for nearby blocks that could kick-start the minecart
else if (IsRailPowered)
{
bool IsBlockZP = IsSolidBlockAtOffset(0, 0, 1);
bool IsBlockZM = IsSolidBlockAtOffset(0, 0, -1);
// Only kick-start the minecart if a block is on one side, but not both
if (IsBlockZM && !IsBlockZP)
{
ApplyAcceleration({ 0.0, 0.0, 1.0 }, Acceleration);
}
else if (!IsBlockZM && IsBlockZP)
{
ApplyAcceleration({ 0.0, 0.0, -1.0 }, Acceleration);
}
}
break;
}
case E_META_RAIL_XM_XP: // EASTWEST
{
SetYaw(180);
SetPosY(floor(GetPosY()) + 0.55);
SetSpeedY(NO_SPEED);
SetSpeedZ(NO_SPEED);
bool BlckCol = TestBlockCollision(a_RailMeta), EntCol = TestEntityCollision(a_RailMeta);
if (EntCol || BlckCol)
{
return;
}
if (GetSpeedX() != NO_SPEED)
{
if (GetSpeedX() > NO_SPEED)
{
ApplyAcceleration({ 1.0, 0.0, 0.0 }, Acceleration);
}
else
{
ApplyAcceleration({ -1.0, 0.0, 0.0 }, Acceleration);
}
}
// If rail is powered check for nearby blocks that could kick-start the minecart
else if (IsRailPowered)
{
bool IsBlockXP = IsSolidBlockAtOffset(1, 0, 0);
bool IsBlockXM = IsSolidBlockAtOffset(-1, 0, 0);
// Only kick-start the minecart if a block is on one side, but not both
if (IsBlockXM && !IsBlockXP)
{
ApplyAcceleration({ 1.0, 0.0, 0.0 }, Acceleration);
}
else if (!IsBlockXM && IsBlockXP)
{
ApplyAcceleration({ -1.0, 0.0, 0.0 }, Acceleration);
}
}
break;
}
case E_META_RAIL_ASCEND_XM: // ASCEND EAST
{
SetYaw(180);
SetSpeedZ(NO_SPEED);
if (GetSpeedX() >= NO_SPEED)
{
ApplyAcceleration({ 1.0, 0.0, 0.0 }, Acceleration);
SetSpeedY(-GetSpeedX());
}
else
{
ApplyAcceleration({ -1.0, 0.0, 0.0 }, Acceleration);
SetSpeedY(-GetSpeedX());
}
break;
}
case E_META_RAIL_ASCEND_XP: // ASCEND WEST
{
SetYaw(180);
SetSpeedZ(NO_SPEED);
if (GetSpeedX() > NO_SPEED)
{
ApplyAcceleration({ 1.0, 0.0, 0.0 }, Acceleration);
SetSpeedY(GetSpeedX());
}
else
{
ApplyAcceleration({ -1.0, 0.0, 0.0 }, Acceleration);
SetSpeedY(GetSpeedX());
}
break;
}
case E_META_RAIL_ASCEND_ZM: // ASCEND NORTH
{
SetYaw(270);
SetSpeedX(NO_SPEED);
if (GetSpeedZ() >= NO_SPEED)
{
ApplyAcceleration({ 0.0, 0.0, 1.0 }, Acceleration);
SetSpeedY(-GetSpeedZ());
}
else
{
ApplyAcceleration({ 0.0, 0.0, -1.0 }, Acceleration);
SetSpeedY(-GetSpeedZ());
}
break;
}
case E_META_RAIL_ASCEND_ZP: // ASCEND SOUTH
{
SetYaw(270);
SetSpeedX(NO_SPEED);
if (GetSpeedZ() > NO_SPEED)
{
ApplyAcceleration({ 0.0, 0.0, 1.0 }, Acceleration);
SetSpeedY(GetSpeedZ());
}
else
{
ApplyAcceleration({ 0.0, 0.0, -1.0 }, Acceleration);
SetSpeedY(GetSpeedZ());
}
break;
}
default: ASSERT(!"Unhandled powered rail metadata!"); break;
}
}
void cMinecart::HandleDetectorRailPhysics(NIBBLETYPE a_RailMeta, std::chrono::milliseconds a_Dt)
{
m_World->SetBlockMeta(m_DetectorRailPosition, a_RailMeta | 0x08);
// No special handling
HandleRailPhysics(a_RailMeta & 0x07, a_Dt);
}
void cMinecart::HandleActivatorRailPhysics(NIBBLETYPE a_RailMeta, std::chrono::milliseconds a_Dt)
{
HandleRailPhysics(a_RailMeta & 0x07, a_Dt);
}
void cMinecart::SnapToRail(NIBBLETYPE a_RailMeta)
{
switch (a_RailMeta)
{
case E_META_RAIL_ASCEND_XM:
case E_META_RAIL_ASCEND_XP:
case E_META_RAIL_XM_XP:
{
SetSpeedZ(NO_SPEED);
SetPosZ(floor(GetPosZ()) + 0.5);
break;
}
case E_META_RAIL_ASCEND_ZM:
case E_META_RAIL_ASCEND_ZP:
case E_META_RAIL_ZM_ZP:
{
SetSpeedX(NO_SPEED);
SetPosX(floor(GetPosX()) + 0.5);
break;
}
// Curved rail physics: once minecart has reached more than half of the block in the direction that it is travelling in, jerk it in the direction of curvature
case E_META_RAIL_CURVED_ZM_XM:
{
if (GetPosZ() > floor(GetPosZ()) + 0.5)
{
if (GetSpeedZ() > NO_SPEED)
{
SetSpeedX(-GetSpeedZ() * 0.7);
}
SetSpeedZ(NO_SPEED);
SetPosZ(floor(GetPosZ()) + 0.5);
}
else if (GetPosX() > floor(GetPosX()) + 0.5)
{
if (GetSpeedX() > 0)
{
SetSpeedZ(-GetSpeedX() * 0.7);
}
SetSpeedX(NO_SPEED);
SetPosX(floor(GetPosX()) + 0.5);
}
SetSpeedY(NO_SPEED);
break;
}
case E_META_RAIL_CURVED_ZM_XP:
{
if (GetPosZ() > floor(GetPosZ()) + 0.5)
{
if (GetSpeedZ() > NO_SPEED)
{
SetSpeedX(GetSpeedZ() * 0.7);
}
SetSpeedZ(NO_SPEED);
SetPosZ(floor(GetPosZ()) + 0.5);
}
else if (GetPosX() < floor(GetPosX()) + 0.5)
{
if (GetSpeedX() < NO_SPEED)
{
SetSpeedZ(GetSpeedX() * 0.7);
}
SetSpeedX(NO_SPEED);
SetPosX(floor(GetPosX()) + 0.5);
}
SetSpeedY(NO_SPEED);
break;
}
case E_META_RAIL_CURVED_ZP_XM:
{
if (GetPosZ() < floor(GetPosZ()) + 0.5)
{
if (GetSpeedZ() < NO_SPEED)
{
SetSpeedX(GetSpeedZ() * 0.7);
}
SetSpeedZ(NO_SPEED);
SetPosZ(floor(GetPosZ()) + 0.5);
}
else if (GetPosX() > floor(GetPosX()) + 0.5)
{
if (GetSpeedX() > NO_SPEED)
{
SetSpeedZ(GetSpeedX() * 0.7);
}
SetSpeedX(NO_SPEED);
SetPosX(floor(GetPosX()) + 0.5);
}
SetSpeedY(NO_SPEED);
break;
}
case E_META_RAIL_CURVED_ZP_XP:
{
if (GetPosZ() < floor(GetPosZ()) + 0.5)
{
if (GetSpeedZ() < NO_SPEED)
{
SetSpeedX(-GetSpeedZ() * 0.7);
}
SetSpeedZ(NO_SPEED);
SetPosZ(floor(GetPosZ()) + 0.5);
}
else if (GetPosX() < floor(GetPosX()) + 0.5)
{
if (GetSpeedX() < NO_SPEED)
{
SetSpeedZ(-GetSpeedX() * 0.7);
}
SetSpeedX(NO_SPEED);
SetPosX(floor(GetPosX()) + 0.5);
}
SetSpeedY(0);
break;
}
default: break;
}
}
bool cMinecart::IsSolidBlockAtPosition(Vector3i a_Pos)
{
BLOCKTYPE Block = m_World->GetBlock(a_Pos);
return !IsBlockRail(Block) && cBlockInfo::IsSolid(Block);
}
bool cMinecart::IsSolidBlockAtOffset(int a_XOffset, int a_YOffset, int a_ZOffset)
{
return IsSolidBlockAtPosition({POSX_TOINT + a_XOffset, POSY_TOINT + a_YOffset, POSZ_TOINT + a_ZOffset});
}
bool cMinecart::IsBlockCollisionAtOffset(Vector3i a_Offset)
{
auto BlockPosition = GetPosition().Floor() + a_Offset;
if (!IsSolidBlockAtPosition(BlockPosition))
{
return false;
}
auto bbBlock = cBoundingBox(
static_cast<Vector3d>(BlockPosition),
static_cast<Vector3d>(BlockPosition + Vector3i(1, 1, 1))
);
return GetBoundingBox().DoesIntersect(bbBlock);
}
bool cMinecart::TestBlockCollision(NIBBLETYPE a_RailMeta)
{
auto SpeedX = GetSpeedX();
auto SpeedZ = GetSpeedZ();
// Don't do anything if minecarts aren't moving.
#ifdef __clang__
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wfloat-equal"
#endif
if ((SpeedX == 0) && (SpeedZ == 0))
{
return false;
}
#ifdef __clang__
#pragma clang diagnostic pop
#endif
auto StopTheCart = true;
auto StopOffset = Vector3d();
switch (a_RailMeta)
{
case E_META_RAIL_ZM_ZP:
{
if (SpeedZ > 0)
{
StopOffset = Vector3d(0, 0, 0.4);
StopTheCart = IsBlockCollisionAtOffset({0, 0, 1});
}
else // SpeedZ < 0
{
StopTheCart = IsBlockCollisionAtOffset({0, 0, -1});
StopOffset = Vector3d(0, 0, 0.65);
}
break;
}
case E_META_RAIL_XM_XP:
{
if (SpeedX > 0)
{
StopTheCart = IsBlockCollisionAtOffset({1, 0, 0});
StopOffset = Vector3d(0.4, 0, 0);
}
else // SpeedX < 0
{
StopTheCart = IsBlockCollisionAtOffset({-1, 0, 0});
StopOffset = Vector3d(0.65, 0, 0);
}
break;
}
// Ascending rails check for one block on the way up, two on the way down.
case E_META_RAIL_ASCEND_XM:
{
StopOffset = Vector3d(0.5, 0, 0);
if (SpeedX < 0)
{
StopTheCart = IsBlockCollisionAtOffset({-1, 1, 0});
}
else // SpeedX > 0
{
StopTheCart = IsBlockCollisionAtOffset({1, 0, 0}) || IsBlockCollisionAtOffset({1, 1, 0});
}
break;
}
case E_META_RAIL_ASCEND_XP:
{
StopOffset = Vector3d(0.5, 0, 0);
if (SpeedX > 0)
{
StopTheCart = IsBlockCollisionAtOffset({1, 1, 0});
}
else // SpeedX < 0
{
StopTheCart = IsBlockCollisionAtOffset({-1, 0, 0}) || IsBlockCollisionAtOffset({-1, 1, 0});
}
break;
}
case E_META_RAIL_ASCEND_ZM:
{
StopOffset = Vector3d(0, 0, 0.5);
if (SpeedZ < 0)
{
StopTheCart = IsBlockCollisionAtOffset({0, 1, -1});
}
else // SpeedZ > 0
{
StopTheCart = IsBlockCollisionAtOffset({0, 0, 1}) || IsBlockCollisionAtOffset({0, 1, 1});
}
break;
}
case E_META_RAIL_ASCEND_ZP:
{
StopOffset = Vector3d(0, 0, 0.5);
if (SpeedZ > 0)
{
StopTheCart = IsBlockCollisionAtOffset({0, 1, 1});
}
else // SpeedZ < 0
{
StopTheCart = IsBlockCollisionAtOffset({0, 0, -1}) || IsBlockCollisionAtOffset({0, 1, -1});
}
break;
}
// Curved rails allow movement across both the x and z axes. But when the cart is
// moving towards one of the rail endpoints, it will always have velocity towards
// the direction of that endpoint in the same axis.
case E_META_RAIL_CURVED_ZP_XP:
{
StopOffset = Vector3d(0.5, 0, 0.5);
if (SpeedZ > 0)
{
StopTheCart = IsBlockCollisionAtOffset({0, 0, 1});
break;
}
if (SpeedX > 0)
{
StopTheCart = IsBlockCollisionAtOffset({1, 0, 0});
break;
}
break;
}
case E_META_RAIL_CURVED_ZP_XM:
{
StopOffset = Vector3d(0.5, 0, 0.5);
if (SpeedZ > 0)
{
StopTheCart = IsBlockCollisionAtOffset({0, 0, 1});
break;
}
if (SpeedX < 0)
{
StopTheCart = IsBlockCollisionAtOffset({-1, 0, 0});
break;
}
break;
}
case E_META_RAIL_CURVED_ZM_XM:
{
StopOffset = Vector3d(0.5, 0, 0.5);
if (SpeedZ < 0)
{
StopTheCart = IsBlockCollisionAtOffset({0, 0, -1});
break;
}
if (SpeedX < 0)
{
StopTheCart = IsBlockCollisionAtOffset({-1, 0, 0});
break;
}
break;
}
case E_META_RAIL_CURVED_ZM_XP:
{
StopOffset = Vector3d(0.5, 0, 0.5);
if (SpeedZ < 0)
{
StopTheCart = IsBlockCollisionAtOffset({0, 0, -1});
break;
}
if (SpeedX > 0)
{
StopTheCart = IsBlockCollisionAtOffset({1, 0, 0});
break;
}
break;
}
}
if (StopTheCart)
{
SetSpeed(0, 0, 0);
#ifdef __clang__
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wfloat-equal"
#endif
if (StopOffset.x != 0)
{
SetPosX(POSX_TOINT + StopOffset.x);
}
if (StopOffset.z != 0)
{
SetPosZ(POSZ_TOINT + StopOffset.z);
}
#ifdef __clang__
#pragma clang diagnostic pop
#endif
return true;
}
return false;
}
bool cMinecart::TestEntityCollision(NIBBLETYPE a_RailMeta)
{
cMinecartCollisionCallback MinecartCollisionCallback(
GetPosition(), GetHeight(), GetWidth(), GetUniqueID(),
((m_Attachee == nullptr) ? cEntity::INVALID_ID : m_Attachee->GetUniqueID())
);
int ChunkX, ChunkZ;
cChunkDef::BlockToChunk(POSX_TOINT, POSZ_TOINT, ChunkX, ChunkZ);
m_World->ForEachEntityInChunk(ChunkX, ChunkZ, MinecartCollisionCallback);
if (!MinecartCollisionCallback.FoundIntersection())
{
return false;
}
switch (a_RailMeta)
{
case E_META_RAIL_ZM_ZP:
{
if (MinecartCollisionCallback.GetCollidedEntityPosition().z >= GetPosZ())
{
if (GetSpeedZ() > 0) // True if minecart is moving into the direction of the entity
{
SetSpeedZ(0); // Entity handles the pushing
}
}
else // if (MinecartCollisionCallback.GetCollidedEntityPosition().z < GetPosZ())
{
if (GetSpeedZ() < 0) // True if minecart is moving into the direction of the entity
{
SetSpeedZ(0); // Entity handles the pushing
}
}
return true;
}
case E_META_RAIL_XM_XP:
{
if (MinecartCollisionCallback.GetCollidedEntityPosition().x >= GetPosX())
{
if (GetSpeedX() > 0) // True if minecart is moving into the direction of the entity
{
SetSpeedX(0); // Entity handles the pushing
}
}
else // if (MinecartCollisionCallback.GetCollidedEntityPosition().x < GetPosX())
{
if (GetSpeedX() < 0) // True if minecart is moving into the direction of the entity
{
SetSpeedX(0); // Entity handles the pushing
}
}
return true;
}
case E_META_RAIL_CURVED_ZM_XM:
case E_META_RAIL_CURVED_ZP_XP:
{
Vector3d Distance = MinecartCollisionCallback.GetCollidedEntityPosition() - Vector3d(GetPosX(), 0, GetPosZ());
// Prevent division by small numbers
if (std::abs(Distance.z) < 0.001)
{
Distance.z = 0.001;
}
/* Check to which side the minecart is to be pushed.
Let's consider a z-x-coordinate system where the minecart is the center (0, 0).
The minecart moves along the line x = -z, the perpendicular line to this is x = z.
In order to decide to which side the minecart is to be pushed, it must be checked on what side of the perpendicular line the pushing entity is located. */
if (
((Distance.z > 0) && ((Distance.x / Distance.z) >= 1)) ||
((Distance.z < 0) && ((Distance.x / Distance.z) <= 1))
)
{
// Moving -X +Z
if ((-GetSpeedX() * 0.4 / sqrt(2.0)) < 0.01)
{
// ~ SpeedX >= 0 Immobile or not moving in the "right" direction. Give it a bump!
AddSpeedX(-4 / sqrt(2.0));
AddSpeedZ(4 / sqrt(2.0));
}
else
{
// ~ SpeedX < 0 Moving in the "right" direction. Only accelerate it a bit.
SetSpeedX(GetSpeedX() * 0.4 / sqrt(2.0));
SetSpeedZ(GetSpeedZ() * 0.4 / sqrt(2.0));
}
}
else if ((GetSpeedX() * 0.4 / sqrt(2.0)) < 0.01)
{
// Moving +X -Z
// ~ SpeedX <= 0 Immobile or not moving in the "right" direction
AddSpeedX(4 / sqrt(2.0));
AddSpeedZ(-4 / sqrt(2.0));
}
else
{
// ~ SpeedX > 0 Moving in the "right" direction
SetSpeedX(GetSpeedX() * 0.4 / sqrt(2.0));
SetSpeedZ(GetSpeedZ() * 0.4 / sqrt(2.0));
}
break;
}
case E_META_RAIL_CURVED_ZM_XP:
case E_META_RAIL_CURVED_ZP_XM:
{
Vector3d Distance = MinecartCollisionCallback.GetCollidedEntityPosition() - Vector3d(GetPosX(), 0, GetPosZ());
// Prevent division by small numbers
if (std::abs(Distance.z) < 0.001)
{
Distance.z = 0.001;
}
/* Check to which side the minecart is to be pushed.
Let's consider a z-x-coordinate system where the minecart is the center (0, 0).
The minecart moves along the line x = z, the perpendicular line to this is x = -z.
In order to decide to which side the minecart is to be pushed, it must be checked on what side of the perpendicular line the pushing entity is located. */
if (
((Distance.z > 0) && ((Distance.x / Distance.z) <= -1)) ||
((Distance.z < 0) && ((Distance.x / Distance.z) >= -1))
)
{
// Moving +X +Z
if ((GetSpeedX() * 0.4) < 0.01)
{
// ~ SpeedX <= 0 Immobile or not moving in the "right" direction
AddSpeedX(4 / sqrt(2.0));
AddSpeedZ(4 / sqrt(2.0));
}
else
{
// ~ SpeedX > 0 Moving in the "right" direction
SetSpeedX(GetSpeedX() * 0.4 / sqrt(2.0));
SetSpeedZ(GetSpeedZ() * 0.4 / sqrt(2.0));
}
}
else if ((-GetSpeedX() * 0.4) < 0.01)
{
// Moving -X -Z
// ~ SpeedX >= 0 Immobile or not moving in the "right" direction
AddSpeedX(-4 / sqrt(2.0));
AddSpeedZ(-4 / sqrt(2.0));
}
else
{
// ~ SpeedX < 0 Moving in the "right" direction
SetSpeedX(GetSpeedX() * 0.4 / sqrt(2.0));
SetSpeedZ(GetSpeedZ() * 0.4 / sqrt(2.0));
}
break;
}
default: break;
}
return false;
}
bool cMinecart::DoTakeDamage(TakeDamageInfo & TDI)
{
if ((TDI.Attacker != nullptr) && TDI.Attacker->IsPlayer() && static_cast<cPlayer *>(TDI.Attacker)->IsGameModeCreative())
{
TDI.FinalDamage = GetMaxHealth(); // Instant hit for creative
SetInvulnerableTicks(0);
return Super::DoTakeDamage(TDI); // No drops for creative
}
m_LastDamage = static_cast<int>(TDI.FinalDamage);
if (!Super::DoTakeDamage(TDI))
{
return false;
}
m_World->BroadcastEntityMetadata(*this);
return true;
}
void cMinecart::KilledBy(TakeDamageInfo & a_TDI)
{
Super::KilledBy(a_TDI);
Destroy();
}
void cMinecart::OnRemoveFromWorld(cWorld & a_World)
{
if (m_bIsOnDetectorRail)
{
m_World->SetBlock(m_DetectorRailPosition, E_BLOCK_DETECTOR_RAIL, m_World->GetBlockMeta(m_DetectorRailPosition) & 0x07);
}
Super::OnRemoveFromWorld(a_World);
}
void cMinecart::ApplyAcceleration(Vector3d a_ForwardDirection, double a_Acceleration)
{
double CurSpeed = GetSpeed().Dot(a_ForwardDirection);
double NewSpeed = CurSpeed + a_Acceleration;
if (NewSpeed < 0.0)
{
// Prevent deceleration from turning the minecart around.
NewSpeed = 0.0;
}
auto Acceleration = a_ForwardDirection * (NewSpeed - CurSpeed);
AddSpeed(Acceleration);
}
////////////////////////////////////////////////////////////////////////////////
// cRideableMinecart:
cRideableMinecart::cRideableMinecart(Vector3d a_Pos, const cItem & a_Content, int a_ContentHeight):
Super(mpNone, a_Pos),
m_Content(a_Content),
m_ContentHeight(a_ContentHeight)
{
}
void cRideableMinecart::GetDrops(cItems & a_Drops, cEntity * a_Killer)
{
a_Drops.emplace_back(E_ITEM_MINECART);
}
void cRideableMinecart::OnRightClicked(cPlayer & a_Player)
{
Super::OnRightClicked(a_Player);
if (m_Attachee != nullptr)
{
if (m_Attachee->GetUniqueID() == a_Player.GetUniqueID())
{
// This player is already sitting in, they want out.
a_Player.Detach();
return;
}
if (m_Attachee->IsPlayer())
{
// Another player is already sitting in here, cannot attach
return;
}
// Detach whatever is sitting in this minecart now:
m_Attachee->Detach();
}
// Attach the player to this minecart
a_Player.AttachTo(this);
}
////////////////////////////////////////////////////////////////////////////////
// cMinecartWithChest:
cMinecartWithChest::cMinecartWithChest(Vector3d a_Pos):
Super(mpChest, a_Pos),
cEntityWindowOwner(this),
m_Contents(ContentsWidth, ContentsHeight)
{
m_Contents.AddListener(*this);
}
void cMinecartWithChest::GetDrops(cItems & a_Drops, cEntity * a_Killer)
{
m_Contents.CopyToItems(a_Drops);
a_Drops.emplace_back(E_ITEM_CHEST_MINECART);
}
void cMinecartWithChest::OnRemoveFromWorld(cWorld & a_World)
{
const auto Window = GetWindow();
if (Window != nullptr)
{
Window->OwnerDestroyed();
}
Super::OnRemoveFromWorld(a_World);
}
void cMinecartWithChest::OnRightClicked(cPlayer & a_Player)
{
// If the window is not created, open it anew:
cWindow * Window = GetWindow();
if (Window == nullptr)
{
OpenNewWindow();
Window = GetWindow();
}
// Open the window for the player:
if (Window != nullptr)
{
if (a_Player.GetWindow() != Window)
{
a_Player.OpenWindow(*Window);
}
}
}
void cMinecartWithChest::OpenNewWindow()
{
OpenWindow(new cMinecartWithChestWindow(this));
}
////////////////////////////////////////////////////////////////////////////////
// cMinecartWithFurnace:
cMinecartWithFurnace::cMinecartWithFurnace(Vector3d a_Pos):
Super(mpFurnace, a_Pos),
m_FueledTimeLeft(-1),
m_IsFueled(false)
{
}
void cMinecartWithFurnace::GetDrops(cItems & a_Drops, cEntity * a_Killer)
{
a_Drops.emplace_back(E_ITEM_FURNACE_MINECART);
}
void cMinecartWithFurnace::OnRightClicked(cPlayer & a_Player)
{
if (a_Player.GetEquippedItem().m_ItemType == E_ITEM_COAL)
{
if (!a_Player.IsGameModeCreative())
{
a_Player.GetInventory().RemoveOneEquippedItem();
}
if (!m_IsFueled) // We don't want to change the direction by right clicking it.
{
AddSpeed(a_Player.GetLookVector().x, 0, a_Player.GetLookVector().z);
}
m_IsFueled = true;
m_FueledTimeLeft = m_FueledTimeLeft + 600; // The minecart will be active 600 more ticks.
m_World->BroadcastEntityMetadata(*this);
}
}
void cMinecartWithFurnace::Tick(std::chrono::milliseconds a_Dt, cChunk & a_Chunk)
{
Super::Tick(a_Dt, a_Chunk);
if (!IsTicking())
{
// The base class tick destroyed us
return;
}
if (m_IsFueled)
{
m_FueledTimeLeft--;
if (m_FueledTimeLeft < 0)
{
m_IsFueled = false;
m_World->BroadcastEntityMetadata(*this);
return;
}
if (GetSpeed().Length() > 6)
{
return;
}
AddSpeed(GetSpeed() / 4);
}
}
////////////////////////////////////////////////////////////////////////////////
// cMinecartWithTNT:
cMinecartWithTNT::cMinecartWithTNT(Vector3d a_Pos):
Super(mpTNT, a_Pos)
{
}
// TODO: Make it activate when passing over activator rail
void cMinecartWithTNT::GetDrops(cItems & a_Drops, cEntity * a_Killer)
{
a_Drops.emplace_back(E_ITEM_MINECART_WITH_TNT);
}
////////////////////////////////////////////////////////////////////////////////
// cMinecartWithHopper:
cMinecartWithHopper::cMinecartWithHopper(Vector3d a_Pos):
Super(mpHopper, a_Pos)
{
}
// TODO: Make it suck up blocks and travel further than any other cart and physics and put and take blocks
// AND AVARYTHING!!
void cMinecartWithHopper::GetDrops(cItems & a_Drops, cEntity * a_Killer)
{
a_Drops.emplace_back(E_ITEM_MINECART_WITH_HOPPER);
}
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