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Final improvements to Minecarts 

* Fixed curved rails being a little broken
+ Implemented detector rails
+ Implemented block collisions on rails
* Fixed snapping to rail
- Removed minecart physics conditions in Entity.cpp as minecarts use
their own simulator when on rails

Fixes #148 and #217; partially implemented #215.

This is Cave Johnson, and we're done here.
This commit is contained in:
Tiger Wang 2014-01-13 22:37:09 +00:00
parent edefa27a48
commit a66e154b90
3 changed files with 297 additions and 98 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

44
src/Entities/Entity.cpp
View File

@ -629,11 +629,6 @@ void cEntity::HandlePhysics(float a_Dt, cChunk & a_Chunk)
{
fallspeed = m_Gravity * a_Dt / 3; // Fall 3x slower in water.
}
else if (IsBlockRail(BlockBelow) && IsMinecart()) // Rails aren't solid, except for Minecarts
{
fallspeed = 0;
m_bOnGround = true;
}
else if (BlockIn == E_BLOCK_COBWEB)
{
NextSpeed.y *= 0.05; // Reduce overall falling speed
@ -648,41 +643,18 @@ void cEntity::HandlePhysics(float a_Dt, cChunk & a_Chunk)
}
else
{
if (IsMinecart())
// Friction
if (NextSpeed.SqrLength() > 0.0004f)
{
if (!IsBlockRail(BlockBelow))
NextSpeed.x *= 0.7f / (1 + a_Dt);
if (fabs(NextSpeed.x) < 0.05)
{
// Friction if minecart is off track, otherwise, Minecart.cpp handles this
if (NextSpeed.SqrLength() > 0.0004f)
{
NextSpeed.x *= 0.7f / (1 + a_Dt);
if (fabs(NextSpeed.x) < 0.05)
{
NextSpeed.x = 0;
}
NextSpeed.z *= 0.7f / (1 + a_Dt);
if (fabs(NextSpeed.z) < 0.05)
{
NextSpeed.z = 0;
}
}
NextSpeed.x = 0;
}
}
else
{
// Friction for non-minecarts
if (NextSpeed.SqrLength() > 0.0004f)
NextSpeed.z *= 0.7f / (1 + a_Dt);
if (fabs(NextSpeed.z) < 0.05)
{
NextSpeed.x *= 0.7f / (1 + a_Dt);
if (fabs(NextSpeed.x) < 0.05)
{
NextSpeed.x = 0;
}
NextSpeed.z *= 0.7f / (1 + a_Dt);
if (fabs(NextSpeed.z) < 0.05)
{
NextSpeed.z = 0;
}
NextSpeed.z = 0;
}
}
}

329
src/Entities/Minecart.cpp
View File

@ -2,6 +2,7 @@
// 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"
@ -10,6 +11,7 @@
#include "../ClientHandle.h"
#include "../Chunk.h"
#include "Player.h"
#include "../BoundingBox.h"
#define MAX_SPEED 8
#define MAX_SPEED_NEGATIVE -MAX_SPEED
@ -21,11 +23,15 @@
cMinecart::cMinecart(ePayload a_Payload, double a_X, double a_Y, double a_Z) :
super(etMinecart, a_X, a_Y, a_Z, 0.98, 0.7),
m_Payload(a_Payload),
m_LastDamage(0)
m_LastDamage(0),
m_DetectorRailPosition(0, 0, 0),
m_bIsOnDetectorRail(false)
{
SetMass(20.f);
SetMaxHealth(6);
SetHealth(6);
SetWidth(1.2);
SetHeight(0.9);
}
@ -56,6 +62,11 @@ void cMinecart::SpawnOn(cClientHandle & a_ClientHandle)
void cMinecart::HandlePhysics(float a_Dt, cChunk & a_Chunk)
{
if (IsDestroyed()) // Mainly to stop detector rails triggering again after minecart is dead
{
return;
}
int PosY = (int)floor(GetPosY());
if ((PosY <= 0) || (PosY >= cChunkDef::Height))
{
@ -80,31 +91,45 @@ void cMinecart::HandlePhysics(float a_Dt, cChunk & a_Chunk)
if (!IsBlockRail(InsideType))
{
Chunk->GetBlockTypeMeta(RelPosX, PosY + 1, RelPosZ, InsideType, InsideMeta);
if (IsBlockRail(InsideType)) AddPosY(1);
Chunk->GetBlockTypeMeta(RelPosX, PosY + 1, RelPosZ, InsideType, InsideMeta); // When an descending minecart hits a flat rail, it goes through the ground; check for this
if (IsBlockRail(InsideType)) AddPosY(1); // Push cart upwards
}
if (IsBlockRail(InsideType))
{
bool WasDetectorRail = false;
SnapToRail(InsideMeta);
switch (InsideType)
{
case E_BLOCK_RAIL: HandleRailPhysics(InsideMeta); break;
case E_BLOCK_DETECTOR_RAIL: break;
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() * (a_Dt / 1000));
AddPosition(GetSpeed() * (a_Dt / 1000)); // Commit changes; as we use our own engine when on rails, this needs to be done, whereas it is normally in Entity.cpp
if (m_bIsOnDetectorRail && !WasDetectorRail)
{
m_World->SetBlock(m_DetectorRailPosition.x, m_DetectorRailPosition.y, m_DetectorRailPosition.z, E_BLOCK_DETECTOR_RAIL, m_World->GetBlockMeta(m_DetectorRailPosition) & 0x07);
m_bIsOnDetectorRail = false;
}
}
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);
}
// Broadcast positioning changes to client
BroadcastMovementUpdate();
}
@ -112,7 +137,7 @@ void cMinecart::HandlePhysics(float a_Dt, cChunk & a_Chunk)
void cMinecart::HandleRailPhysics(NIBBLETYPE a_RailMeta)
void cMinecart::HandleRailPhysics(NIBBLETYPE a_RailMeta, float a_Dt)
{
/*
NOTE: Please bear in mind that taking away from negatives make them even more negative,
@ -127,6 +152,8 @@ void cMinecart::HandleRailPhysics(NIBBLETYPE a_RailMeta)
SetPosY(floor(GetPosY()) + 0.55);
SetSpeedY(0); // Don't move vertically as on ground
SetSpeedX(0); // Correct diagonal movement from curved rails
if (TestBlockCollision(a_RailMeta)) return;
if (GetSpeedZ() != 0) // Don't do anything if cart is stationary
{
@ -150,6 +177,8 @@ void cMinecart::HandleRailPhysics(NIBBLETYPE a_RailMeta)
SetSpeedY(0);
SetSpeedZ(0);
if (TestBlockCollision(a_RailMeta)) return;
if (GetSpeedX() != 0)
{
if (GetSpeedX() > 0)
@ -250,60 +279,94 @@ void cMinecart::HandleRailPhysics(NIBBLETYPE a_RailMeta)
case E_META_RAIL_CURVED_ZM_XM: // Ends pointing NORTH and WEST
{
SetRotation(315); // Set correct rotation server side
SetPosY(floor(GetPosY()) + 0.3); // Levitate dat cart
SetPosY(floor(GetPosY()) + 0.55); // Levitate dat cart
if (TestBlockCollision(a_RailMeta)) return;
if (GetSpeedZ() > 0) // Cart moving south
{
SetSpeedX(-GetSpeedZ()); // Diagonally move southwest (which will make cart hit a southwest rail)
int OldX = (int)floor(GetPosX());
AddSpeedX(-GetSpeedZ() + 0.5); // See below
AddPosX(-GetSpeedZ() * (a_Dt / 1000)); // Diagonally move southwest (which will make cart hit a southwest rail)
// If we are already at southwest rail, set Z speed to zero as we can be moving so fast, MCS doesn't tick fast enough to active the handle for the rail...
// ...and so we derail unexpectedly.
if (GetPosX() <= OldX - 1) SetSpeedZ(0);
}
else if (GetSpeedX() > 0) // Cart moving east
{
SetSpeedZ(-GetSpeedX()); // Diagonally move northeast
int OldZ = (int)floor(GetPosZ());
AddSpeedZ(-GetSpeedX() + 0.5);
AddPosZ(-GetSpeedX() * (a_Dt / 1000)); // Diagonally move northeast
if (GetPosZ() <= OldZ - 1) SetSpeedX(0);
}
break;
}
case E_META_RAIL_CURVED_ZM_XP: // Curved NORTH EAST
{
SetRotation(225);
SetPosY(floor(GetPosY()) + 0.3);
SetPosY(floor(GetPosY()) + 0.55);
if (TestBlockCollision(a_RailMeta)) return;
if (GetSpeedZ() > 0)
{
SetSpeedX(GetSpeedZ());
int OldX = (int)floor(GetPosX());
AddSpeedX(GetSpeedZ() - 0.5);
AddPosX(GetSpeedZ() * (a_Dt / 1000));
if (GetPosX() >= OldX + 1) SetSpeedZ(0);
}
else if (GetSpeedX() < 0)
{
SetSpeedZ(GetSpeedX());
int OldZ = (int)floor(GetPosZ());
AddSpeedZ(GetSpeedX() + 0.5);
AddPosZ(GetSpeedX() * (a_Dt / 1000));
if (GetPosZ() <= OldZ - 1) SetSpeedX(0);
}
break;
}
case E_META_RAIL_CURVED_ZP_XM: // Curved SOUTH WEST
{
SetRotation(135);
SetPosY(floor(GetPosY()) + 0.3);
SetPosY(floor(GetPosY()) + 0.55);
if (TestBlockCollision(a_RailMeta)) return;
if (GetSpeedZ() < 0)
{
SetSpeedX(GetSpeedZ());
int OldX = (int)floor(GetPosX());
AddSpeedX(GetSpeedZ() + 0.5);
AddPosX(GetSpeedZ() * (a_Dt / 1000));
if (GetPosX() <= OldX - 1) SetSpeedZ(0);
}
else if (GetSpeedX() > 0)
{
SetSpeedZ(GetSpeedX());
int OldZ = (int)floor(GetPosZ());
AddSpeedZ(GetSpeedX() - 0.5);
AddPosZ(GetSpeedX() * (a_Dt / 1000));
if (GetPosZ() >= OldZ + 1) SetSpeedX(0);
}
break;
}
case E_META_RAIL_CURVED_ZP_XP: // Curved SOUTH EAST
{
SetRotation(45);
SetPosY(floor(GetPosY()) + 0.3);
SetPosY(floor(GetPosY()) + 0.55);
if (TestBlockCollision(a_RailMeta)) return;
if (GetSpeedZ() < 0)
{
SetSpeedX(-GetSpeedZ());
int OldX = (int)floor(GetPosX());
AddSpeedX(-GetSpeedZ() - 0.5);
AddPosX(-GetSpeedZ() * (a_Dt / 1000));
if (GetPosX() >= OldX + 1) SetSpeedZ(0);
}
else if (GetSpeedX() < 0)
{
SetSpeedZ(-GetSpeedX());
int OldZ = (int)floor(GetPosZ());
AddSpeedZ(-GetSpeedX() - 0.5);
AddPosZ(-GetSpeedX() * (a_Dt / 1000));
if (GetPosZ() >= OldZ + 1) SetSpeedX(0);
}
break;
}
@ -320,52 +383,62 @@ void cMinecart::HandleRailPhysics(NIBBLETYPE a_RailMeta)
void cMinecart::HandlePoweredRailPhysics(NIBBLETYPE a_RailMeta)
{
// Initialise to 'slow down' values
int AccelDecelSpeed = -1;
int AccelDecelNegSpeed = 1;
if ((a_RailMeta & 0x8) == 0x8)
{
switch (a_RailMeta & 0x07)
{
case E_META_RAIL_ZM_ZP: // NORTHSOUTH
{
SetRotation(270);
SetPosY(floor(GetPosY()) + 0.55);
SetSpeedY(0); // Don't move vertically as on ground
SetSpeedX(0); // Correct diagonal movement from curved rails
if (GetSpeedZ() != 0) // Don't do anything if cart is stationary
{
if (GetSpeedZ() > 0)
{
// Going SOUTH, slow down
AddSpeedZ(1);
}
else
{
// Going NORTH, slow down
AddSpeedZ(-1);
}
}
break;
}
case E_META_RAIL_XM_XP: // EASTWEST
{
SetRotation(180);
SetPosY(floor(GetPosY()) + 0.55);
SetSpeedY(0);
SetSpeedZ(0);
// Rail powered - set variables to 'speed up' values
AccelDecelSpeed = 1;
AccelDecelNegSpeed = -1;
}
if (GetSpeedX() != 0)
switch (a_RailMeta & 0x07)
{
case E_META_RAIL_ZM_ZP: // NORTHSOUTH
{
SetRotation(270);
SetPosY(floor(GetPosY()) + 0.55);
SetSpeedY(0);
SetSpeedX(0);
if (TestBlockCollision(a_RailMeta)) return;
if (GetSpeedZ() != 0)
{
if (GetSpeedZ() > 0)
{
if (GetSpeedX() > 0)
{
AddSpeedX(-1);
}
else
{
AddSpeedX(1);
}
AddSpeedZ(AccelDecelNegSpeed);
}
else
{
AddSpeedZ(AccelDecelSpeed);
}
break;
}
break;
}
case E_META_RAIL_XM_XP: // EASTWEST
{
SetRotation(180);
SetPosY(floor(GetPosY()) + 0.55);
SetSpeedY(0);
SetSpeedZ(0);
if (TestBlockCollision(a_RailMeta)) return;
if (GetSpeedX() != 0)
{
if (GetSpeedX() > 0)
{
AddSpeedX(AccelDecelSpeed);
}
else
{
AddSpeedX(AccelDecelNegSpeed);
}
}
break;
}
}
}
@ -374,6 +447,20 @@ void cMinecart::HandlePoweredRailPhysics(NIBBLETYPE a_RailMeta)
void cMinecart::HandleDetectorRailPhysics(NIBBLETYPE a_RailMeta, float a_Dt)
{
m_bIsOnDetectorRail = true;
m_DetectorRailPosition = Vector3i((int)floor(GetPosX()), (int)floor(GetPosY()), (int)floor(GetPosZ()));
m_World->SetBlockMeta(m_DetectorRailPosition, a_RailMeta | 0x08);
HandleRailPhysics(a_RailMeta & 0x07, a_Dt);
}
void cMinecart::SnapToRail(NIBBLETYPE a_RailMeta)
{
switch (a_RailMeta)
@ -383,7 +470,7 @@ void cMinecart::SnapToRail(NIBBLETYPE a_RailMeta)
case E_META_RAIL_XM_XP:
{
SetSpeedZ(0);
SetPosZ(floor(GetPosZ()) + 0.3);
SetPosZ(floor(GetPosZ()) + 0.5);
break;
}
case E_META_RAIL_ASCEND_ZM:
@ -391,7 +478,7 @@ void cMinecart::SnapToRail(NIBBLETYPE a_RailMeta)
case E_META_RAIL_ZM_ZP:
{
SetSpeedX(0);
SetPosX(floor(GetPosX()) + 0.3);
SetPosX(floor(GetPosX()) + 0.5);
break;
}
default: break;
@ -402,6 +489,114 @@ void cMinecart::SnapToRail(NIBBLETYPE a_RailMeta)
bool cMinecart::TestBlockCollision(NIBBLETYPE a_RailMeta)
{
switch (a_RailMeta)
{
case E_META_RAIL_ZM_ZP:
{
if (GetSpeedZ() > 0)
{
BLOCKTYPE Block = m_World->GetBlock((int)floor(GetPosX()), (int)floor(GetPosY()), (int)ceil(GetPosZ()));
if (!IsBlockRail(Block) && g_BlockIsSolid[Block])
{
// We could try to detect a block in front based purely on coordinates, but xoft made a bounding box system - why not use? :P
cBoundingBox bbBlock(Vector3d((int)floor(GetPosX()), (int)floor(GetPosY()), (int)ceil(GetPosZ())), 0.5, 1);
cBoundingBox bbMinecart(Vector3d(GetPosX(), floor(GetPosY()), GetPosZ()), GetWidth() / 2, GetHeight());
if (bbBlock.DoesIntersect(bbMinecart))
{
SetSpeed(0, 0, 0);
SetPosZ(floor(GetPosZ()) + 0.4);
return true;
}
}
}
else
{
BLOCKTYPE Block = m_World->GetBlock((int)floor(GetPosX()), (int)floor(GetPosY()), (int)floor(GetPosZ()) - 1);
if (!IsBlockRail(Block) && g_BlockIsSolid[Block])
{
cBoundingBox bbBlock(Vector3d((int)floor(GetPosX()), (int)floor(GetPosY()), (int)floor(GetPosZ()) - 1), 0.5, 1);
cBoundingBox bbMinecart(Vector3d(GetPosX(), floor(GetPosY()), GetPosZ() - 1), GetWidth() / 2, GetHeight());
if (bbBlock.DoesIntersect(bbMinecart))
{
SetSpeed(0, 0, 0);
SetPosZ(floor(GetPosZ()) + 0.65);
return true;
}
}
}
break;
}
case E_META_RAIL_XM_XP:
{
if (GetSpeedX() > 0)
{
BLOCKTYPE Block = m_World->GetBlock((int)ceil(GetPosX()), (int)floor(GetPosY()), (int)floor(GetPosZ()));
if (!IsBlockRail(Block) && g_BlockIsSolid[Block])
{
cBoundingBox bbBlock(Vector3d((int)ceil(GetPosX()), (int)floor(GetPosY()), (int)floor(GetPosZ())), 0.5, 1);
cBoundingBox bbMinecart(Vector3d(GetPosX(), floor(GetPosY()), GetPosZ()), GetWidth() / 2, GetHeight());
if (bbBlock.DoesIntersect(bbMinecart))
{
SetSpeed(0, 0, 0);
SetPosX(floor(GetPosX()) + 0.4);
return true;
}
}
}
else
{
BLOCKTYPE Block = m_World->GetBlock((int)floor(GetPosX()) - 1, (int)floor(GetPosY()), (int)floor(GetPosZ()));
if (!IsBlockRail(Block) && g_BlockIsSolid[Block])
{
cBoundingBox bbBlock(Vector3d((int)floor(GetPosX()) - 1, (int)floor(GetPosY()), (int)floor(GetPosZ())), 0.5, 1);
cBoundingBox bbMinecart(Vector3d(GetPosX() - 1, floor(GetPosY()), GetPosZ()), GetWidth() / 2, GetHeight());
if (bbBlock.DoesIntersect(bbMinecart))
{
SetSpeed(0, 0, 0);
SetPosX(floor(GetPosX()) + 0.65);
return true;
}
}
}
break;
}
case E_META_RAIL_CURVED_ZM_XM:
case E_META_RAIL_CURVED_ZM_XP:
case E_META_RAIL_CURVED_ZP_XM:
case E_META_RAIL_CURVED_ZP_XP:
{
BLOCKTYPE BlockXM = m_World->GetBlock((int)floor(GetPosX()) - 1, (int)floor(GetPosY()), (int)floor(GetPosZ()));
BLOCKTYPE BlockXP = m_World->GetBlock((int)floor(GetPosX()) + 1, (int)floor(GetPosY()), (int)floor(GetPosZ()));
BLOCKTYPE BlockZM = m_World->GetBlock((int)floor(GetPosX()), (int)floor(GetPosY()), (int)floor(GetPosZ()) + 1);
BLOCKTYPE BlockZP = m_World->GetBlock((int)floor(GetPosX()), (int)floor(GetPosY()), (int)floor(GetPosZ()) + 1);
if (
(!IsBlockRail(BlockXM) && g_BlockIsSolid[BlockXM]) ||
(!IsBlockRail(BlockXP) && g_BlockIsSolid[BlockXP]) ||
(!IsBlockRail(BlockZM) && g_BlockIsSolid[BlockZM]) ||
(!IsBlockRail(BlockZP) && g_BlockIsSolid[BlockZP])
)
{
SetSpeed(0, 0, 0);
SetPosition((int)floor(GetPosX()) + 0.5, GetPosY(), (int)floor(GetPosZ()) + 0.5);
return true;
}
break;
}
default: break;
}
return false;
}
void cMinecart::DoTakeDamage(TakeDamageInfo & TDI)
{
if (TDI.Attacker->IsPlayer() && ((cPlayer *)TDI.Attacker)->IsGameModeCreative())
@ -464,6 +659,18 @@ void cMinecart::DoTakeDamage(TakeDamageInfo & TDI)
void cMinecart::Destroyed()
{
if (m_bIsOnDetectorRail)
{
m_World->SetBlock(m_DetectorRailPosition.x, m_DetectorRailPosition.y, m_DetectorRailPosition.z, E_BLOCK_DETECTOR_RAIL, m_World->GetBlockMeta(m_DetectorRailPosition) & 0x07);
}
}
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// cEmptyMinecart:

22
src/Entities/Minecart.h
View File

@ -51,6 +51,7 @@ public:
virtual void SpawnOn(cClientHandle & a_ClientHandle) override;
virtual void HandlePhysics(float a_Dt, cChunk & a_Chunk) override;
virtual void DoTakeDamage(TakeDamageInfo & TDI) override;
virtual void Destroyed() override;
int LastDamage(void) const { return m_LastDamage; }
ePayload GetPayload(void) const { return m_Payload; }
@ -58,11 +59,30 @@ public:
protected:
ePayload m_Payload;
int m_LastDamage;
Vector3i m_DetectorRailPosition;
bool m_bIsOnDetectorRail;
cMinecart(ePayload a_Payload, double a_X, double a_Y, double a_Z);
void HandleRailPhysics(NIBBLETYPE a_RailMeta);
/** Handles physics on normal rails
For each tick, slow down on flat rails, speed up or slow down on ascending/descending rails (depending on direction), and turn on curved rails
*/
void HandleRailPhysics(NIBBLETYPE a_RailMeta, float a_Dt);
/** Handles powered rail physics
Each tick, speed up or slow down cart, depending on metadata of rail (powered or not)
*/
void HandlePoweredRailPhysics(NIBBLETYPE a_RailMeta);
/** Handles detector rail activation
Activates detector rails when a minecart is on them. Calls HandleRailPhysics() for physics simulations
*/
void HandleDetectorRailPhysics(NIBBLETYPE a_RailMeta, float a_Dt);
/** Snaps a minecart to a rail's axis, resetting its speed */
void SnapToRail(NIBBLETYPE a_RailMeta);
/** Tests is a solid block is in front of a cart, and stops the cart (and returns true) if so; returns false if no obstruction*/
bool TestBlockCollision(NIBBLETYPE a_RailMeta);
} ;