d4708
/
source-engine
mirror of https://github.com/nillerusr/source-engine.git
1
0
Fork 0
Code Issues Projects Releases Wiki Activity
Modified source engine (2017) developed by valve and leaked in 2020. Not for commercial purporses
You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
48 Commits
25 Branches
6 Tags
221 MiB
Tree: 0b5a04e732
Branches Tags
${ item.name }
Create tag ${ searchTerm }
Create branch ${ searchTerm }
from '0b5a04e732'
${ noResults }
source-engine/game/server/ai_trackpather.cpp

1697 lines
53 KiB
Raw Normal View History Unescape

1
5 years ago
//========= Copyright Valve Corporation, All rights reserved. ============//
//
// Purpose:
//
//=============================================================================//
#include "cbase.h"
#include "trains.h"
#include "ai_trackpather.h"
// memdbgon must be the last include file in a .cpp file!!!
#include "tier0/memdbgon.h"
#define TRACKPATHER_DEBUG_LEADING 1
#define TRACKPATHER_DEBUG_PATH 2
#define TRACKPATHER_DEBUG_TRACKS 3
ConVar g_debug_trackpather( "g_debug_trackpather", "0", FCVAR_CHEAT );
//------------------------------------------------------------------------------
BEGIN_DATADESC( CAI_TrackPather )
DEFINE_FIELD( m_vecDesiredPosition, FIELD_POSITION_VECTOR ),
DEFINE_FIELD( m_vecGoalOrientation, FIELD_VECTOR ),
DEFINE_FIELD( m_pCurrentPathTarget, FIELD_CLASSPTR ),
DEFINE_FIELD( m_pDestPathTarget, FIELD_CLASSPTR ),
DEFINE_FIELD( m_pLastPathTarget, FIELD_CLASSPTR ),
DEFINE_FIELD( m_pTargetNearestPath, FIELD_CLASSPTR ),
DEFINE_FIELD( m_strCurrentPathName, FIELD_STRING ),
DEFINE_FIELD( m_strDestPathName, FIELD_STRING ),
DEFINE_FIELD( m_strLastPathName, FIELD_STRING ),
DEFINE_FIELD( m_strTargetNearestPathName, FIELD_STRING ),
DEFINE_FIELD( m_vecLastGoalCheckPosition, FIELD_POSITION_VECTOR ),
DEFINE_FIELD( m_flEnemyPathUpdateTime, FIELD_TIME ),
DEFINE_FIELD( m_bForcedMove, FIELD_BOOLEAN ),
DEFINE_FIELD( m_bPatrolling, FIELD_BOOLEAN ),
DEFINE_FIELD( m_bPatrolBreakable, FIELD_BOOLEAN ),
DEFINE_FIELD( m_bLeading, FIELD_BOOLEAN ),
// Derived class pathing data
DEFINE_FIELD( m_flTargetDistanceThreshold, FIELD_FLOAT ),
DEFINE_FIELD( m_flAvoidDistance, FIELD_FLOAT ),
DEFINE_FIELD( m_flTargetTolerance, FIELD_FLOAT ),
DEFINE_FIELD( m_vecSegmentStartPoint, FIELD_POSITION_VECTOR ),
DEFINE_FIELD( m_vecSegmentStartSplinePoint, FIELD_POSITION_VECTOR ),
DEFINE_FIELD( m_bMovingForward, FIELD_BOOLEAN ),
DEFINE_FIELD( m_bChooseFarthestPoint, FIELD_BOOLEAN ),
DEFINE_FIELD( m_flFarthestPathDist, FIELD_FLOAT ),
DEFINE_FIELD( m_flPathMaxSpeed, FIELD_FLOAT ),
DEFINE_FIELD( m_flTargetDistFromPath, FIELD_FLOAT ),
DEFINE_FIELD( m_flLeadDistance, FIELD_FLOAT ),
DEFINE_FIELD( m_vecTargetPathDir, FIELD_VECTOR ),
DEFINE_FIELD( m_vecTargetPathPoint, FIELD_POSITION_VECTOR ),
DEFINE_FIELD( m_nPauseState, FIELD_INTEGER ),
// Inputs
DEFINE_INPUTFUNC( FIELD_STRING, "SetTrack", InputSetTrack ),
DEFINE_INPUTFUNC( FIELD_STRING, "FlyToSpecificTrackViaPath", InputFlyToPathTrack ),
DEFINE_INPUTFUNC( FIELD_VOID, "StartPatrol", InputStartPatrol ),
DEFINE_INPUTFUNC( FIELD_VOID, "StopPatrol", InputStopPatrol ),
DEFINE_INPUTFUNC( FIELD_VOID, "StartBreakableMovement", InputStartBreakableMovement ),
DEFINE_INPUTFUNC( FIELD_VOID, "StopBreakableMovement", InputStopBreakableMovement ),
DEFINE_INPUTFUNC( FIELD_VOID, "ChooseFarthestPathPoint", InputChooseFarthestPathPoint ),
DEFINE_INPUTFUNC( FIELD_VOID, "ChooseNearestPathPoint", InputChooseNearestPathPoint ),
DEFINE_INPUTFUNC( FIELD_INTEGER,"InputStartLeading", InputStartLeading ),
DEFINE_INPUTFUNC( FIELD_VOID, "InputStopLeading", InputStopLeading ),
// Obsolete, for backwards compatibility
DEFINE_INPUTFUNC( FIELD_VOID, "StartPatrolBreakable", InputStartPatrolBreakable ),
DEFINE_INPUTFUNC( FIELD_STRING, "FlyToPathTrack", InputFlyToPathTrack ),
END_DATADESC()
//-----------------------------------------------------------------------------
// Purpose: Initialize pathing data
//-----------------------------------------------------------------------------
void CAI_TrackPather::InitPathingData( float flTrackArrivalTolerance, float flTargetDistance, float flAvoidDistance )
{
m_flTargetTolerance = flTrackArrivalTolerance;
m_flTargetDistanceThreshold = flTargetDistance;
m_flAvoidDistance = flAvoidDistance;
m_pCurrentPathTarget = NULL;
m_pDestPathTarget = NULL;
m_pLastPathTarget = NULL;
m_pTargetNearestPath = NULL;
m_bLeading = false;
m_flEnemyPathUpdateTime = gpGlobals->curtime;
m_bForcedMove = false;
m_bPatrolling = false;
m_bPatrolBreakable = false;
m_flLeadDistance = 0.0f;
m_bMovingForward = true;
m_vecSegmentStartPoint = m_vecSegmentStartSplinePoint = m_vecDesiredPosition = GetAbsOrigin();
m_bChooseFarthestPoint = true;
m_flFarthestPathDist = 1e10;
m_flPathMaxSpeed = 0;
m_nPauseState = PAUSE_NO_PAUSE;
}
//-----------------------------------------------------------------------------
// Purpose:
//-----------------------------------------------------------------------------
void CAI_TrackPather::OnRestore( void )
{
BaseClass::OnRestore();
// Restore current path
if ( m_strCurrentPathName != NULL_STRING )
{
m_pCurrentPathTarget = (CPathTrack *) gEntList.FindEntityByName( NULL, m_strCurrentPathName );
}
else
{
m_pCurrentPathTarget = NULL;
}
// Restore destination path
if ( m_strDestPathName != NULL_STRING )
{
m_pDestPathTarget = (CPathTrack *) gEntList.FindEntityByName( NULL, m_strDestPathName );
}
else
{
m_pDestPathTarget = NULL;
}
// Restore last path
if ( m_strLastPathName != NULL_STRING )
{
m_pLastPathTarget = (CPathTrack *) gEntList.FindEntityByName( NULL, m_strLastPathName );
}
else
{
m_pLastPathTarget = NULL;
}
// Restore target nearest path
if ( m_strTargetNearestPathName != NULL_STRING )
{
m_pTargetNearestPath = (CPathTrack *) gEntList.FindEntityByName( NULL, m_strTargetNearestPathName );
}
else
{
m_pTargetNearestPath = NULL;
}
}
//-----------------------------------------------------------------------------
// Purpose:
//-----------------------------------------------------------------------------
void CAI_TrackPather::OnSave( IEntitySaveUtils *pUtils )
{
BaseClass::OnSave( pUtils );
// Stash all the paths into strings for restoration later
m_strCurrentPathName = ( m_pCurrentPathTarget != NULL ) ? m_pCurrentPathTarget->GetEntityName() : NULL_STRING;
m_strDestPathName = ( m_pDestPathTarget != NULL ) ? m_pDestPathTarget->GetEntityName() : NULL_STRING;
m_strLastPathName = ( m_pLastPathTarget != NULL ) ? m_pLastPathTarget->GetEntityName() : NULL_STRING;
m_strTargetNearestPathName = ( m_pTargetNearestPath != NULL ) ? m_pTargetNearestPath->GetEntityName() : NULL_STRING;
}
//-----------------------------------------------------------------------------
// Leading distance
//-----------------------------------------------------------------------------
void CAI_TrackPather::EnableLeading( bool bEnable )
{
bool bWasLeading = m_bLeading;
m_bLeading = bEnable;
if ( m_bLeading )
{
m_bPatrolling = false;
}
else if ( bWasLeading )
{
// Going from leading to not leading. Refresh the desired position
// to prevent us from hovering around our old, no longer valid lead position.
if ( m_pCurrentPathTarget )
{
SetDesiredPosition( m_pCurrentPathTarget->GetAbsOrigin() );
}
}
}
void CAI_TrackPather::SetLeadingDistance( float flLeadDistance )
{
m_flLeadDistance = flLeadDistance;
}
float CAI_TrackPather::GetLeadingDistance( ) const
{
return m_flLeadDistance;
}
//-----------------------------------------------------------------------------
// Returns the next path along our current path
//-----------------------------------------------------------------------------
inline CPathTrack *CAI_TrackPather::NextAlongCurrentPath( CPathTrack *pPath ) const
{
return CPathTrack::ValidPath( m_bMovingForward ? pPath->GetNext() : pPath->GetPrevious() );
}
inline CPathTrack *CAI_TrackPather::PreviousAlongCurrentPath( CPathTrack *pPath ) const
{
return CPathTrack::ValidPath( m_bMovingForward ? pPath->GetPrevious() : pPath->GetNext() );
}
inline CPathTrack *CAI_TrackPather::AdjustForMovementDirection( CPathTrack *pPath ) const
{
if ( !m_bMovingForward && CPathTrack::ValidPath( pPath->GetPrevious( ) ) )
{
pPath = CPathTrack::ValidPath( pPath->GetPrevious() );
}
return pPath;
}
//-----------------------------------------------------------------------------
// Enemy visibility check
//-----------------------------------------------------------------------------
CBaseEntity *CAI_TrackPather::FindTrackBlocker( const Vector &vecViewPoint, const Vector &vecTargetPos )
{
trace_t tr;
AI_TraceHull( vecViewPoint, vecTargetPos, -Vector(4,4,4), Vector(4,4,4), MASK_SHOT, this, COLLISION_GROUP_NONE, &tr );
return (tr.fraction != 1.0f) ? tr.m_pEnt : NULL;
}
//-----------------------------------------------------------------------------
// Purpose:
// Input : &targetPos -
// Output : CBaseEntity
//-----------------------------------------------------------------------------
CPathTrack *CAI_TrackPather::BestPointOnPath( CPathTrack *pPath, const Vector &targetPos, float flAvoidRadius, bool visible, bool bFarthestPoint )
{
// Find the node nearest to the destination path target if a path is not specified
if ( pPath == NULL )
{
pPath = m_pDestPathTarget;
}
// If the path node we're trying to use is not valid, then we're done.
if ( CPathTrack::ValidPath( pPath ) == NULL )
{
//FIXME: Implement
Assert(0);
return NULL;
}
// Our target may be in a vehicle
CBaseEntity *pVehicle = NULL;
CBaseEntity *pTargetEnt = GetTrackPatherTargetEnt();
if ( pTargetEnt != NULL )
{
CBaseCombatCharacter *pCCTarget = pTargetEnt->MyCombatCharacterPointer();
if ( pCCTarget != NULL && pCCTarget->IsInAVehicle() )
{
pVehicle = pCCTarget->GetVehicleEntity();
}
}
// Faster math...
flAvoidRadius *= flAvoidRadius;
// Find the nearest node to the target (going forward)
CPathTrack *pNearestPath = NULL;
float flNearestDist = bFarthestPoint ? 0 : 999999999;
float flPathDist;
float flFarthestDistSqr = ( m_flFarthestPathDist - 2.0f * m_flTargetDistanceThreshold );
flFarthestDistSqr *= flFarthestDistSqr;
// NOTE: Gotta do it this crazy way because paths can be one-way.
for ( int i = 0; i < 2; ++i )
{
int loopCheck = 0;
CPathTrack *pTravPath = pPath;
CPathTrack *pNextPath;
BEGIN_PATH_TRACK_ITERATION();
for ( ; CPathTrack::ValidPath( pTravPath ); pTravPath = pNextPath, loopCheck++ )
{
// Circular loop checking
if ( pTravPath->HasBeenVisited() )
break;
pTravPath->Visit();
pNextPath = (i == 0) ? pTravPath->GetPrevious() : pTravPath->GetNext();
// Find the distance between this test point and our goal point
flPathDist = ( pTravPath->GetAbsOrigin() - targetPos ).LengthSqr();
// See if it's closer and it's also not within our avoidance radius
if ( bFarthestPoint )
{
if ( ( flPathDist <= flNearestDist ) && ( flNearestDist <= flFarthestDistSqr ) )
continue;
}
else
{
if ( flPathDist >= flNearestDist )
continue;
}
// Don't choose points that are within the avoid radius
if ( flAvoidRadius && ( pTravPath->GetAbsOrigin() - targetPos ).Length2DSqr() <= flAvoidRadius )
continue;
if ( visible )
{
// If it has to be visible, run those checks
CBaseEntity *pBlocker = FindTrackBlocker( pTravPath->GetAbsOrigin(), targetPos );
// Check to see if we've hit the target, or the player's vehicle if it's a player in a vehicle
bool bHitTarget = ( pTargetEnt && ( pTargetEnt == pBlocker ) ) ||
( pVehicle && ( pVehicle == pBlocker ) );
// If we hit something, and it wasn't the target or his vehicle, then no dice
// If we hit the target and forced move was set, *still* no dice
if ( (pBlocker != NULL) && ( !bHitTarget || m_bForcedMove ) )
continue;
}
pNearestPath = pTravPath;
flNearestDist = flPathDist;
}
}
return pNearestPath;
}
//-----------------------------------------------------------------------------
// Compute a point n units along a path
//-----------------------------------------------------------------------------
CPathTrack *CAI_TrackPather::ComputeLeadingPointAlongPath( const Vector &vecStartPoint,
CPathTrack *pFirstTrack, float flDistance, Vector *pTarget )
{
bool bMovingForward = (flDistance > 0.0f);
flDistance = fabs(flDistance);
CPathTrack *pTravPath = pFirstTrack;
if ( (!bMovingForward) && pFirstTrack->GetPrevious() )
{
pTravPath = pFirstTrack->GetPrevious();
}
*pTarget = vecStartPoint;
CPathTrack *pNextPath;
// No circular loop checking needed; eventually, it'll run out of distance
for ( ; CPathTrack::ValidPath( pTravPath ); pTravPath = pNextPath )
{
pNextPath = bMovingForward ? pTravPath->GetNext() : pTravPath->GetPrevious();
// Find the distance between this test point and our goal point
float flPathDist = pTarget->DistTo( pTravPath->GetAbsOrigin() );
// Find the distance between this test point and our goal point
if ( flPathDist <= flDistance )
{
flDistance -= flPathDist;
*pTarget = pTravPath->GetAbsOrigin();
if ( !CPathTrack::ValidPath(pNextPath) )
return bMovingForward ? pTravPath : pTravPath->GetNext();
continue;
}
ComputeClosestPoint( *pTarget, flDistance, pTravPath->GetAbsOrigin(), pTarget );
return bMovingForward ? pTravPath : pTravPath->GetNext();
}
return NULL;
}
//-----------------------------------------------------------------------------
// Compute the distance to a particular point on the path
//-----------------------------------------------------------------------------
float CAI_TrackPather::ComputeDistanceAlongPathToPoint( CPathTrack *pStartTrack,
CPathTrack *pDestTrack, const Vector &vecDestPosition, bool bMovingForward )
{
float flTotalDist = 0.0f;
Vector vecPoint;
ClosestPointToCurrentPath( &vecPoint );
CPathTrack *pTravPath = pStartTrack;
CPathTrack *pNextPath, *pTestPath;
BEGIN_PATH_TRACK_ITERATION();
for ( ; CPathTrack::ValidPath( pTravPath ); pTravPath = pNextPath )
{
// Circular loop checking
if ( pTravPath->HasBeenVisited() )
break;
// Mark it as being visited.
pTravPath->Visit();
pNextPath = bMovingForward ? pTravPath->GetNext() : pTravPath->GetPrevious();
pTestPath = pTravPath;
Assert( pTestPath );
if ( pTravPath == pDestTrack )
{
Vector vecDelta;
Vector vecPathDelta;
VectorSubtract( vecDestPosition, vecPoint, vecDelta );
ComputePathDirection( pTravPath, &vecPathDelta );
float flDot = DotProduct( vecDelta, vecPathDelta );
flTotalDist += (flDot > 0.0f ? 1.0f : -1.0f) * vecDelta.Length2D();
break;
}
// NOTE: This would be made more accurate if we did the path direction check here too.
// The starting vecPoint is sometimes *not* within the bounds of the line segment.
// Find the distance between this test point and our goal point
flTotalDist += (bMovingForward ? 1.0f : -1.0f) * vecPoint.AsVector2D().DistTo( pTestPath->GetAbsOrigin().AsVector2D() );
vecPoint = pTestPath->GetAbsOrigin();
}
return flTotalDist;
}
//------------------------------------------------------------------------------
// Track debugging info
//------------------------------------------------------------------------------
void CAI_TrackPather::VisualizeDebugInfo( const Vector &vecNearestPoint, const Vector &vecTarget )
{
if ( g_debug_trackpather.GetInt() == TRACKPATHER_DEBUG_PATH )
{
NDebugOverlay::Line( m_vecSegmentStartPoint, vecTarget, 0, 0, 255, true, 0.1f );
NDebugOverlay::Cross3D( vecNearestPoint, -Vector(16,16,16), Vector(16,16,16), 255, 0, 0, true, 0.1f );
NDebugOverlay::Cross3D( m_pCurrentPathTarget->GetAbsOrigin(), -Vector(16,16,16), Vector(16,16,16), 0, 255, 0, true, 0.1f );
NDebugOverlay::Cross3D( m_vecDesiredPosition, -Vector(16,16,16), Vector(16,16,16), 0, 0, 255, true, 0.1f );
NDebugOverlay::Cross3D( m_pDestPathTarget->GetAbsOrigin(), -Vector(16,16,16), Vector(16,16,16), 255, 255, 255, true, 0.1f );
if ( m_pTargetNearestPath )
{
NDebugOverlay::Cross3D( m_pTargetNearestPath->GetAbsOrigin(), -Vector(24,24,24), Vector(24,24,24), 255, 0, 255, true, 0.1f );
}
}
if ( g_debug_trackpather.GetInt() == TRACKPATHER_DEBUG_TRACKS )
{
if ( m_pCurrentPathTarget )
{
CPathTrack *pPathTrack = m_pCurrentPathTarget;
for ( ; CPathTrack::ValidPath( pPathTrack ); pPathTrack = pPathTrack->GetNext() )
{
NDebugOverlay::Box( pPathTrack->GetAbsOrigin(), -Vector(2,2,2), Vector(2,2,2), 0,255, 0, 8, 0.1 );
if ( CPathTrack::ValidPath( pPathTrack->GetNext() ) )
{
NDebugOverlay::Line( pPathTrack->GetAbsOrigin(), pPathTrack->GetNext()->GetAbsOrigin(), 0,255,0, true, 0.1 );
}
if ( pPathTrack->GetNext() == m_pCurrentPathTarget )
break;
}
}
}
}
//------------------------------------------------------------------------------
// Does this path track have LOS to the target?
//------------------------------------------------------------------------------
bool CAI_TrackPather::HasLOSToTarget( CPathTrack *pTrack )
{
CBaseEntity *pTargetEnt = GetTrackPatherTargetEnt();
if ( !pTargetEnt )
return true;
Vector targetPos;
if ( !GetTrackPatherTarget( &targetPos ) )
return true;
// Translate driver into vehicle for testing
CBaseEntity *pVehicle = NULL;
CBaseCombatCharacter *pCCTarget = pTargetEnt->MyCombatCharacterPointer();
if ( pCCTarget != NULL && pCCTarget->IsInAVehicle() )
{
pVehicle = pCCTarget->GetVehicleEntity();
}
// If it has to be visible, run those checks
CBaseEntity *pBlocker = FindTrackBlocker( pTrack->GetAbsOrigin(), targetPos );
// Check to see if we've hit the target, or the player's vehicle if it's a player in a vehicle
bool bHitTarget = ( pTargetEnt && ( pTargetEnt == pBlocker ) ) ||
( pVehicle && ( pVehicle == pBlocker ) );
return (pBlocker == NULL) || bHitTarget;
}
//------------------------------------------------------------------------------
// Moves to the track
//------------------------------------------------------------------------------
void CAI_TrackPather::UpdateCurrentTarget()
{
// Find the point along the line that we're closest to.
const Vector &vecTarget = m_pCurrentPathTarget->GetAbsOrigin();
Vector vecPoint;
float t = ClosestPointToCurrentPath( &vecPoint );
if ( (t < 1.0f) && ( vecPoint.DistToSqr( vecTarget ) > m_flTargetTolerance * m_flTargetTolerance ) )
goto visualizeDebugInfo;
// Forced move is gone as soon as we've reached the first point on our path
if ( m_bLeading )
{
m_bForcedMove = false;
}
// Trip our "path_track reached" output
if ( m_pCurrentPathTarget != m_pLastPathTarget )
{
// Get the path's specified max speed
m_flPathMaxSpeed = m_pCurrentPathTarget->m_flSpeed;
variant_t emptyVariant;
m_pCurrentPathTarget->AcceptInput( "InPass", this, this, emptyVariant, 0 );
m_pLastPathTarget = m_pCurrentPathTarget;
}
if ( m_nPauseState == PAUSED_AT_POSITION )
return;
if ( m_nPauseState == PAUSE_AT_NEXT_LOS_POSITION )
{
if ( HasLOSToTarget(m_pCurrentPathTarget) )
{
m_nPauseState = PAUSED_AT_POSITION;
return;
}
}
// Update our dest path target, if appropriate...
if ( m_pCurrentPathTarget == m_pDestPathTarget )
{
m_bForcedMove = false;
SelectNewDestTarget();
}
// Did SelectNewDestTarget give us a new point to move to?
if ( m_pCurrentPathTarget != m_pDestPathTarget )
{
// Update to the next path, if there is one...
m_pCurrentPathTarget = NextAlongCurrentPath( m_pCurrentPathTarget );
if ( !m_pCurrentPathTarget )
{
m_pCurrentPathTarget = m_pLastPathTarget;
}
}
else
{
// We're at rest (no patrolling behavior), which means we're moving forward now.
m_bMovingForward = true;
}
SetDesiredPosition( m_pCurrentPathTarget->GetAbsOrigin() );
m_vecSegmentStartSplinePoint = m_vecSegmentStartPoint;
m_vecSegmentStartPoint = m_pLastPathTarget->GetAbsOrigin();
visualizeDebugInfo:
VisualizeDebugInfo( vecPoint, vecTarget );
}
//-----------------------------------------------------------------------------
//
// NOTE: All code below is used exclusively for leading/trailing behavior
//
//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------
// Compute the distance to the leading position
//-----------------------------------------------------------------------------
float CAI_TrackPather::ComputeDistanceToLeadingPosition()
{
return ComputeDistanceAlongPathToPoint( m_pCurrentPathTarget, m_pDestPathTarget, GetDesiredPosition(), m_bMovingForward );
}
//-----------------------------------------------------------------------------
// Compute the distance to the *target* position
//-----------------------------------------------------------------------------
float CAI_TrackPather::ComputeDistanceToTargetPosition()
{
Assert( m_pTargetNearestPath );
CPathTrack *pDest = m_bMovingForward ? m_pTargetNearestPath.Get() : m_pTargetNearestPath->GetPrevious();
if ( !pDest )
{
pDest = m_pTargetNearestPath;
}
bool bMovingForward = IsForwardAlongPath( m_pCurrentPathTarget, pDest );
CPathTrack *pStart = m_pCurrentPathTarget;
if ( bMovingForward != m_bMovingForward )
{
if (bMovingForward)
{
if ( pStart->GetNext() )
{
pStart = pStart->GetNext();
}
if ( pDest->GetNext() )
{
pDest = pDest->GetNext();
}
}
else
{
if ( pStart->GetPrevious() )
{
pStart = pStart->GetPrevious();
}
if ( pDest->GetPrevious() )
{
pDest = pDest->GetPrevious();
}
}
}
return ComputeDistanceAlongPathToPoint( pStart, pDest, m_vecTargetPathPoint, bMovingForward );
}
//-----------------------------------------------------------------------------
// Compute a path direction
//-----------------------------------------------------------------------------
void CAI_TrackPather::ComputePathDirection( CPathTrack *pPath, Vector *pVecPathDir )
{
if ( pPath->GetPrevious() )
{
VectorSubtract( pPath->GetAbsOrigin(), pPath->GetPrevious()->GetAbsOrigin(), *pVecPathDir );
}
else
{
if ( pPath->GetNext() )
{
VectorSubtract( pPath->GetNext()->GetAbsOrigin(), pPath->GetAbsOrigin(), *pVecPathDir );
}
else
{
pVecPathDir->Init( 1, 0, 0 );
}
}
VectorNormalize( *pVecPathDir );
}
//-----------------------------------------------------------------------------
// What's the current path direction?
//-----------------------------------------------------------------------------
void CAI_TrackPather::CurrentPathDirection( Vector *pVecPathDir )
{
if ( m_pCurrentPathTarget )
{
ComputePathDirection( m_pCurrentPathTarget, pVecPathDir );
}
else
{
pVecPathDir->Init( 0, 0, 1 );
}
}
//-----------------------------------------------------------------------------
// Compute a point n units along the current path from our current position
// (but don't pass the desired target point)
//-----------------------------------------------------------------------------
void CAI_TrackPather::ComputePointAlongCurrentPath( float flDistance, float flPerpDist, Vector *pTarget )
{
Vector vecPathDir;
Vector vecStartPoint;
ClosestPointToCurrentPath( &vecStartPoint );
*pTarget = vecStartPoint;
if ( flDistance != 0.0f )
{
Vector vecPrevPoint = vecStartPoint;
CPathTrack *pTravPath = m_pCurrentPathTarget;
CPathTrack *pAdjustedDest = AdjustForMovementDirection( m_pDestPathTarget );
for ( ; CPathTrack::ValidPath( pTravPath ); pTravPath = NextAlongCurrentPath( pTravPath ) )
{
if ( pTravPath == pAdjustedDest )
{
ComputePathDirection( pTravPath, &vecPathDir );
float flPathDist = pTarget->DistTo( GetDesiredPosition() );
if ( flDistance > flPathDist )
{
*pTarget = GetDesiredPosition();
}
else
{
ComputeClosestPoint( *pTarget, flDistance, GetDesiredPosition(), pTarget );
}
break;
}
// Find the distance between this test point and our goal point
float flPathDist = pTarget->DistTo( pTravPath->GetAbsOrigin() );
// Find the distance between this test point and our goal point
if ( flPathDist <= flDistance )
{
flDistance -= flPathDist;
*pTarget = pTravPath->GetAbsOrigin();
// FIXME: Reduce the distance further based on the angle between this segment + the next
continue;
}
ComputePathDirection( pTravPath, &vecPathDir );
ComputeClosestPoint( *pTarget, flDistance, pTravPath->GetAbsOrigin(), pTarget );
break;
}
}
else
{
VectorSubtract( m_pCurrentPathTarget->GetAbsOrigin(), m_vecSegmentStartPoint, vecPathDir );
VectorNormalize( vecPathDir );
}
// Add in the horizontal component
ComputePointFromPerpDistance( *pTarget, vecPathDir, flPerpDist, pTarget );
}
//-----------------------------------------------------------------------------
// Methods to find a signed perp distance from the track
// and to compute a point off the path based on the signed perp distance
//-----------------------------------------------------------------------------
float CAI_TrackPather::ComputePerpDistanceFromPath( const Vector &vecPointOnPath, const Vector &vecPathDir, const Vector &vecPointOffPath )
{
// Make it be a signed distance of the target from the path
// Positive means on the right side, negative means on the left side
Vector vecAcross, vecDelta;
CrossProduct( vecPathDir, Vector( 0, 0, 1 ), vecAcross );
VectorSubtract( vecPointOffPath, vecPointOnPath, vecDelta );
VectorMA( vecDelta, -DotProduct( vecPathDir, vecDelta ), vecPathDir, vecDelta );
float flDistanceFromPath = vecDelta.Length2D();
if ( DotProduct2D( vecAcross.AsVector2D(), vecDelta.AsVector2D() ) < 0.0f )
{
flDistanceFromPath *= -1.0f;
}
return flDistanceFromPath;
}
void CAI_TrackPather::ComputePointFromPerpDistance( const Vector &vecPointOnPath, const Vector &vecPathDir, float flPerpDist, Vector *pResult )
{
Vector vecAcross;
CrossProduct( vecPathDir, Vector( 0, 0, 1 ), vecAcross );
VectorMA( vecPointOnPath, flPerpDist, vecAcross, *pResult );
}
//-----------------------------------------------------------------------------
// Finds the closest point on the path, returns a signed perpendicular distance
// where negative means on the left side of the path (when travelled from prev to next)
// and positive means on the right side
//-----------------------------------------------------------------------------
CPathTrack *CAI_TrackPather::FindClosestPointOnPath( CPathTrack *pPath,
const Vector &targetPos, Vector *pVecClosestPoint, Vector *pVecPathDir, float *pDistanceFromPath )
{
// Find the node nearest to the destination path target if a path is not specified
if ( pPath == NULL )
{
pPath = m_pDestPathTarget;
}
// If the path node we're trying to use is not valid, then we're done.
if ( CPathTrack::ValidPath( pPath ) == NULL )
{
//FIXME: Implement
Assert(0);
return NULL;
}
// Find the nearest node to the target (going forward)
CPathTrack *pNearestPath = NULL;
float flNearestDist2D = 999999999;
float flNearestDist = 999999999;
float flPathDist, flPathDist2D;
// NOTE: Gotta do it this crazy way because paths can be one-way.
Vector vecNearestPoint;
Vector vecNearestPathSegment;
for ( int i = 0; i < 2; ++i )
{
int loopCheck = 0;
CPathTrack *pTravPath = pPath;
CPathTrack *pNextPath;
BEGIN_PATH_TRACK_ITERATION();
for ( ; CPathTrack::ValidPath( pTravPath ); pTravPath = pNextPath, loopCheck++ )
{
// Circular loop checking
if ( pTravPath->HasBeenVisited() )
break;
// Mark it as being visited.
pTravPath->Visit();
pNextPath = (i == 0) ? pTravPath->GetPrevious() : pTravPath->GetNext();
// No alt paths allowed in leading mode.
if ( pTravPath->m_paltpath )
{
Warning( "%s: Alternative paths in path_track not allowed when using the leading behavior!\n", GetEntityName().ToCStr() );
}
// Need line segments
if ( !CPathTrack::ValidPath(pNextPath) )
break;
// Find the closest point on the line segment on the path
Vector vecClosest;
CalcClosestPointOnLineSegment( targetPos, pTravPath->GetAbsOrigin(), pNextPath->GetAbsOrigin(), vecClosest );
// Find the distance between this test point and our goal point
flPathDist2D = vecClosest.AsVector2D().DistToSqr( targetPos.AsVector2D() );
if ( flPathDist2D > flNearestDist2D )
continue;
flPathDist = vecClosest.z - targetPos.z;
flPathDist *= flPathDist;
flPathDist += flPathDist2D;
if (( flPathDist2D == flNearestDist2D ) && ( flPathDist >= flNearestDist ))
continue;
pNearestPath = (i == 0) ? pTravPath : pNextPath;
flNearestDist2D = flPathDist2D;
flNearestDist = flPathDist;
vecNearestPoint = vecClosest;
VectorSubtract( pNextPath->GetAbsOrigin(), pTravPath->GetAbsOrigin(), vecNearestPathSegment );
if ( i == 0 )
{
vecNearestPathSegment *= -1.0f;
}
}
}
VectorNormalize( vecNearestPathSegment );
*pDistanceFromPath = ComputePerpDistanceFromPath( vecNearestPoint, vecNearestPathSegment, targetPos );
*pVecClosestPoint = vecNearestPoint;
*pVecPathDir = vecNearestPathSegment;
return pNearestPath;
}
//-----------------------------------------------------------------------------
// Breakable paths?
//-----------------------------------------------------------------------------
void CAI_TrackPather::InputStartBreakableMovement( inputdata_t &inputdata )
{
m_bPatrolBreakable = true;
}
void CAI_TrackPather::InputStopBreakableMovement( inputdata_t &inputdata )
{
m_bPatrolBreakable = false;
}
//-----------------------------------------------------------------------------
// Purpose:
// Input : &inputdata -
//-----------------------------------------------------------------------------
void CAI_TrackPather::InputStartPatrol( inputdata_t &inputdata )
{
m_bPatrolling = true;
}
//-----------------------------------------------------------------------------
//
//-----------------------------------------------------------------------------
void CAI_TrackPather::InputStopPatrol( inputdata_t &inputdata )
{
m_bPatrolling = false;
}
//-----------------------------------------------------------------------------
// Purpose:
// Input : &inputdata -
//-----------------------------------------------------------------------------
void CAI_TrackPather::InputStartPatrolBreakable( inputdata_t &inputdata )
{
m_bPatrolBreakable = true;
m_bPatrolling = true;
}
//------------------------------------------------------------------------------
// Leading behaviors
//------------------------------------------------------------------------------
void CAI_TrackPather::InputStartLeading( inputdata_t &inputdata )
{
EnableLeading( true );
SetLeadingDistance( inputdata.value.Int() );
}
void CAI_TrackPather::InputStopLeading( inputdata_t &inputdata )
{
EnableLeading( false );
}
//------------------------------------------------------------------------------
// Selects a new destination target
//------------------------------------------------------------------------------
void CAI_TrackPather::SelectNewDestTarget()
{
if ( !m_bPatrolling )
return;
// NOTE: This version is bugged, but I didn't want to make the fix
// here for fear of breaking a lot of maps late in the day.
// So, only the chopper does the "right" thing.
#ifdef HL2_EPISODIC
// Episodic uses the fixed logic for all trackpathers
if ( 1 )
#else
if ( ShouldUseFixedPatrolLogic() )
#endif
{
CPathTrack *pOldDest = m_pDestPathTarget;
// Only switch polarity of movement if we're at the *end* of the path
// This is really useful for initial conditions of patrolling
// NOTE: We've got to do some extra work for circular paths
bool bIsCircular = false;
{
BEGIN_PATH_TRACK_ITERATION();
CPathTrack *pTravPath = m_pDestPathTarget;
while( CPathTrack::ValidPath( pTravPath ) )
{
// Circular loop checking
if ( pTravPath->HasBeenVisited() )
{
bIsCircular = true;
break;
}
pTravPath->Visit();
pTravPath = NextAlongCurrentPath( pTravPath );
}
}
if ( bIsCircular || (NextAlongCurrentPath( m_pDestPathTarget ) == NULL) )
{
m_bMovingForward = !m_bMovingForward;
}
BEGIN_PATH_TRACK_ITERATION();
while ( true )
{
CPathTrack *pNextTrack = NextAlongCurrentPath( m_pDestPathTarget );
if ( !pNextTrack || (pNextTrack == pOldDest) || pNextTrack->HasBeenVisited() )
break;
pNextTrack->Visit();
m_pDestPathTarget = pNextTrack;
}
}
else
{
CPathTrack *pOldDest = m_pDestPathTarget;
// For patrolling, switch the polarity of movement
m_bMovingForward = !m_bMovingForward;
int loopCount = 0;
while ( true )
{
CPathTrack *pNextTrack = NextAlongCurrentPath( m_pDestPathTarget );
if ( !pNextTrack )
break;
if ( ++loopCount > 1024 )
{
DevMsg(1,"WARNING: Looping path for %s\n", GetDebugName() );
break;
}
m_pDestPathTarget = pNextTrack;
}
if ( m_pDestPathTarget == pOldDest )
{
// This can occur if we move to the first point on the path
SelectNewDestTarget();
}
}
}
//------------------------------------------------------------------------------
// Moves to the track
//------------------------------------------------------------------------------
void CAI_TrackPather::UpdateCurrentTargetLeading()
{
bool bRestingAtDest = false;
CPathTrack *pAdjustedDest;
// Find the point along the line that we're closest to.
const Vector &vecTarget = m_pCurrentPathTarget->GetAbsOrigin();
Vector vecPoint;
float t = ClosestPointToCurrentPath( &vecPoint );
if ( (t < 1.0f) && ( vecPoint.DistToSqr( vecTarget ) > m_flTargetTolerance * m_flTargetTolerance ) )
goto visualizeDebugInfo;
// Trip our "path_track reached" output
if ( m_pCurrentPathTarget != m_pLastPathTarget )
{
// Get the path's specified max speed
m_flPathMaxSpeed = m_pCurrentPathTarget->m_flSpeed;
variant_t emptyVariant;
m_pCurrentPathTarget->AcceptInput( "InPass", this, this, emptyVariant, 0 );
m_pLastPathTarget = m_pCurrentPathTarget;
}
// NOTE: CurrentPathTarget doesn't mean the same thing as dest path target!
// It's the "next"most when moving forward + "prev"most when moving backward
// Must do the tests in the same space
pAdjustedDest = AdjustForMovementDirection( m_pDestPathTarget );
// Update our dest path target, if appropriate...
if ( m_pCurrentPathTarget == pAdjustedDest )
{
m_bForcedMove = false;
SelectNewDestTarget();
// NOTE: Must do this again since SelectNewDestTarget may change m_pDestPathTarget
pAdjustedDest = AdjustForMovementDirection( m_pDestPathTarget );
}
if ( m_pCurrentPathTarget != pAdjustedDest )
{
// Update to the next path, if there is one...
m_pCurrentPathTarget = NextAlongCurrentPath( m_pCurrentPathTarget );
if ( !m_pCurrentPathTarget )
{
m_pCurrentPathTarget = m_pLastPathTarget;
}
}
else
{
// NOTE: Have to do this here because the NextAlongCurrentPath call above
// could make m_pCurrentPathTarget == m_pDestPathTarget.
// In this case, we're at rest (no patrolling behavior)
bRestingAtDest = true;
}
if ( bRestingAtDest )
{
// NOTE: Must use current path target, instead of dest
// to get the PreviousAlongCurrentPath working correctly
CPathTrack *pSegmentStart = PreviousAlongCurrentPath( m_pCurrentPathTarget );
if ( !pSegmentStart )
{
pSegmentStart = m_pCurrentPathTarget;
}
m_vecSegmentStartPoint = pSegmentStart->GetAbsOrigin();
}
else
{
m_vecSegmentStartPoint = m_pLastPathTarget->GetAbsOrigin();
}
visualizeDebugInfo:
VisualizeDebugInfo( vecPoint, vecTarget );
}
//-----------------------------------------------------------------------------
// Purpose:
//-----------------------------------------------------------------------------
void CAI_TrackPather::UpdateTargetPositionLeading( void )
{
Vector targetPos;
if ( !GetTrackPatherTarget( &targetPos ) )
return;
// NOTE: FindClosestPointOnPath *always* returns the point on the "far",
// end of the line segment containing the closest point (namely the 'next'
// track, as opposed to the 'prev' track)
Vector vecClosestPoint, vecPathDir;
float flTargetDistanceFromPath;
CPathTrack *pNextPath = FindClosestPointOnPath( m_pCurrentPathTarget,
targetPos, &vecClosestPoint, &vecPathDir, &flTargetDistanceFromPath );
// This means that a valid path could not be found to our target!
if ( CPathTrack::ValidPath( pNextPath ) == NULL )
return;
// NDebugOverlay::Cross3D( vecClosestPoint, -Vector(24,24,24), Vector(24,24,24), 0, 255, 255, true, 0.1f );
// NDebugOverlay::Cross3D( pNextPath->GetAbsOrigin(), -Vector(24,24,24), Vector(24,24,24), 255, 255, 0, true, 0.1f );
// Here's how far we are from the path
m_flTargetDistFromPath = flTargetDistanceFromPath;
m_vecTargetPathDir = vecPathDir;
// Here's info about where the target is along the path
m_vecTargetPathPoint = vecClosestPoint;
m_pTargetNearestPath = pNextPath;
// Find the best position to be on our path
// NOTE: This will *also* return a path track on the "far" end of the line segment
// containing the leading position, namely the "next" end of the segment as opposed
// to the "prev" end of the segment.
CPathTrack *pDest = ComputeLeadingPointAlongPath( vecClosestPoint, pNextPath, m_flLeadDistance, &targetPos );
SetDesiredPosition( targetPos );
// We only want to switch movement directions when absolutely necessary
// so convert dest into a more appropriate value based on the current movement direction
if ( pDest != m_pDestPathTarget )
{
// NOTE: This is really tricky + subtle
// For leading, we don't want to ever change direction when the current target == the
// adjusted destination target. Namely, if we're going forward, both dest + curr
// mean the "next"most node so we can compare them directly against eath other.
// If we're moving backward, dest means "next"most, but curr means "prev"most.
// We first have to adjust the dest to mean "prev"most, and then do the comparison.
// If the adjusted dest == curr, then maintain direction. Otherwise, use the forward along path test.
bool bMovingForward = m_bMovingForward;
CPathTrack *pAdjustedDest = AdjustForMovementDirection( pDest );
if ( m_pCurrentPathTarget != pAdjustedDest )
{
bMovingForward = IsForwardAlongPath( m_pCurrentPathTarget, pAdjustedDest );
}
if ( bMovingForward != m_bMovingForward )
{
// As a result of the tricky note above, this should never occur
Assert( pAdjustedDest != m_pCurrentPathTarget );
// Oops! Need to reverse direction
m_bMovingForward = bMovingForward;
m_vecSegmentStartPoint = m_pCurrentPathTarget->GetAbsOrigin();
m_pCurrentPathTarget = NextAlongCurrentPath( m_pCurrentPathTarget );
}
m_pDestPathTarget = pDest;
}
// NDebugOverlay::Cross3D( m_pCurrentPathTarget->GetAbsOrigin(), -Vector(36,36,36), Vector(36,36,36), 255, 0, 0, true, 0.1f );
// NDebugOverlay::Cross3D( m_pDestPathTarget->GetAbsOrigin(), -Vector(48,48,48), Vector(48,48,48), 0, 255, 0, true, 0.1f );
// NDebugOverlay::Cross3D( targetPos, -Vector(36,36,36), Vector(36,36,36), 0, 0, 255, true, 0.1f );
}
//-----------------------------------------------------------------------------
// Purpose:
//-----------------------------------------------------------------------------
void CAI_TrackPather::UpdateTargetPosition( void )
{
// Don't update our target if we're being told to go somewhere
if ( m_bForcedMove && !m_bPatrolBreakable )
return;
// Don't update our target if we're patrolling
if ( m_bPatrolling )
{
// If we have an enemy, and our patrol is breakable, stop patrolling
if ( !m_bPatrolBreakable || !GetEnemy() )
return;
m_bPatrolling = false;
}
Vector targetPos;
if ( !GetTrackPatherTarget( &targetPos ) )
return;
// Not time to update again
if ( m_flEnemyPathUpdateTime > gpGlobals->curtime )
return;
// See if the target has moved enough to make us recheck
float flDistSqr = ( targetPos - m_vecLastGoalCheckPosition ).LengthSqr();
if ( flDistSqr < m_flTargetDistanceThreshold * m_flTargetDistanceThreshold )
return;
// Find the best position to be on our path
CPathTrack *pDest = BestPointOnPath( m_pCurrentPathTarget, targetPos, m_flAvoidDistance, true, m_bChooseFarthestPoint );
if ( CPathTrack::ValidPath( pDest ) == NULL )
{
// This means that a valid path could not be found to our target!
// Assert(0);
return;
}
if ( pDest != m_pDestPathTarget )
{
// This is our new destination
bool bMovingForward = IsForwardAlongPath( m_pCurrentPathTarget, pDest );
if ( bMovingForward != m_bMovingForward )
{
// Oops! Need to reverse direction
m_bMovingForward = bMovingForward;
if ( pDest != m_pCurrentPathTarget )
{
SetupNewCurrentTarget( NextAlongCurrentPath( m_pCurrentPathTarget ) );
}
}
m_pDestPathTarget = pDest;
}
// Keep this goal point for comparisons later
m_vecLastGoalCheckPosition = targetPos;
// Only do this on set intervals
m_flEnemyPathUpdateTime = gpGlobals->curtime + 1.0f;
}
//------------------------------------------------------------------------------
// Returns the direction of the path at the closest point to the target
//------------------------------------------------------------------------------
const Vector &CAI_TrackPather::TargetPathDirection() const
{
return m_vecTargetPathDir;
}
const Vector &CAI_TrackPather::TargetPathAcrossDirection() const
{
static Vector s_Result;
CrossProduct( m_vecTargetPathDir, Vector( 0, 0, 1 ), s_Result );
return s_Result;
}
//------------------------------------------------------------------------------
// Returns the speed of the target relative to the path
//------------------------------------------------------------------------------
float CAI_TrackPather::TargetSpeedAlongPath() const
{
if ( !GetEnemy() || !IsLeading() )
return 0.0f;
Vector vecSmoothedVelocity = GetEnemy()->GetSmoothedVelocity();
return DotProduct( vecSmoothedVelocity, TargetPathDirection() );
}
//------------------------------------------------------------------------------
// Returns the speed of the target *across* the path
//------------------------------------------------------------------------------
float CAI_TrackPather::TargetSpeedAcrossPath() const
{
if ( !GetEnemy() || !IsLeading() )
return 0.0f;
Vector vecSmoothedVelocity = GetEnemy()->GetSmoothedVelocity();
return DotProduct( vecSmoothedVelocity, TargetPathAcrossDirection() );
}
//------------------------------------------------------------------------------
// Returns the max distance we can be from the path
//------------------------------------------------------------------------------
float CAI_TrackPather::MaxDistanceFromCurrentPath() const
{
if ( !IsLeading() || !m_pCurrentPathTarget )
return 0.0f;
CPathTrack *pPrevPath = PreviousAlongCurrentPath( m_pCurrentPathTarget );
if ( !pPrevPath )
{
pPrevPath = m_pCurrentPathTarget;
}
// NOTE: Can't use m_vecSegmentStartPoint because we don't have a radius defined for it
float t;
Vector vecTemp;
CalcClosestPointOnLine( GetAbsOrigin(), pPrevPath->GetAbsOrigin(),
m_pCurrentPathTarget->GetAbsOrigin(), vecTemp, &t );
t = clamp( t, 0.0f, 1.0f );
float flRadius = (1.0f - t) * pPrevPath->GetRadius() + t * m_pCurrentPathTarget->GetRadius();
return flRadius;
}
//------------------------------------------------------------------------------
// Purpose : A different version of the track pather which is more explicit about
// the meaning of dest, current, and prev path points
//------------------------------------------------------------------------------
void CAI_TrackPather::UpdateTrackNavigation( void )
{
// No target? Use the string specified. We have no spawn method (sucky!!) so this is how that works
if ( ( CPathTrack::ValidPath( m_pDestPathTarget ) == NULL ) && ( m_target != NULL_STRING ) )
{
FlyToPathTrack( m_target );
m_target = NULL_STRING;
}
if ( !IsLeading() )
{
if ( !m_pCurrentPathTarget )
return;
// Updates our destination node if we're tracking something
UpdateTargetPosition();
// Move along our path towards our current destination
UpdateCurrentTarget();
}
else
{
// Updates our destination position if we're leading something
UpdateTargetPositionLeading();
// Move along our path towards our current destination
UpdateCurrentTargetLeading();
}
}
//------------------------------------------------------------------------------
// Sets the farthest path distance
//------------------------------------------------------------------------------
void CAI_TrackPather::SetFarthestPathDist( float flMaxPathDist )
{
m_flFarthestPathDist = flMaxPathDist;
}
//------------------------------------------------------------------------------
// Sets up a new current path target
//------------------------------------------------------------------------------
void CAI_TrackPather::SetupNewCurrentTarget( CPathTrack *pTrack )
{
Assert( pTrack );
m_vecSegmentStartPoint = GetAbsOrigin();
VectorMA( m_vecSegmentStartPoint, -2.0f, GetAbsVelocity(), m_vecSegmentStartSplinePoint );
m_pCurrentPathTarget = pTrack;
SetDesiredPosition( m_pCurrentPathTarget->GetAbsOrigin() );
}
//------------------------------------------------------------------------------
// Moves to an explicit track point
//------------------------------------------------------------------------------
void CAI_TrackPather::MoveToTrackPoint( CPathTrack *pTrack )
{
if ( IsOnSameTrack( pTrack, m_pDestPathTarget ) )
{
// The track must be valid
if ( CPathTrack::ValidPath( pTrack ) == NULL )
return;
m_pDestPathTarget = pTrack;
m_bMovingForward = IsForwardAlongPath( m_pCurrentPathTarget, pTrack );
m_bForcedMove = true;
}
else
{
CPathTrack *pClosestTrack = BestPointOnPath( pTrack, WorldSpaceCenter(), 0.0f, false, false );
// The track must be valid
if ( CPathTrack::ValidPath( pClosestTrack ) == NULL )
return;
SetupNewCurrentTarget( pClosestTrack );
m_pDestPathTarget = pTrack;
m_bMovingForward = IsForwardAlongPath( pClosestTrack, pTrack );
m_bForcedMove = true;
}
}
//------------------------------------------------------------------------------
// Moves to the closest track point
//------------------------------------------------------------------------------
void CAI_TrackPather::MoveToClosestTrackPoint( CPathTrack *pTrack )
{
if ( IsOnSameTrack( pTrack, m_pDestPathTarget ) )
return;
CPathTrack *pClosestTrack = BestPointOnPath( pTrack, WorldSpaceCenter(), 0.0f, false, false );
// The track must be valid
if ( CPathTrack::ValidPath( pClosestTrack ) == NULL )
return;
SetupNewCurrentTarget( pClosestTrack );
m_pDestPathTarget = pClosestTrack;
m_bMovingForward = true;
// Force us to switch tracks if we're leading
if ( IsLeading() )
{
m_bForcedMove = true;
}
}
//-----------------------------------------------------------------------------
// Are the two path tracks connected?
//-----------------------------------------------------------------------------
bool CAI_TrackPather::IsOnSameTrack( CPathTrack *pPath1, CPathTrack *pPath2 ) const
{
if ( pPath1 == pPath2 )
return true;
{
BEGIN_PATH_TRACK_ITERATION();
CPathTrack *pTravPath = pPath1->GetPrevious();
while( CPathTrack::ValidPath( pTravPath ) && (pTravPath != pPath1) )
{
// Circular loop checking
if ( pTravPath->HasBeenVisited() )
break;
pTravPath->Visit();
if ( pTravPath == pPath2 )
return true;
pTravPath = pTravPath->GetPrevious();
}
}
{
BEGIN_PATH_TRACK_ITERATION();
CPathTrack *pTravPath = pPath1->GetNext();
while( CPathTrack::ValidPath( pTravPath ) && (pTravPath != pPath1) )
{
// Circular loop checking
if ( pTravPath->HasBeenVisited() )
break;
pTravPath->Visit();
if ( pTravPath == pPath2 )
return true;
pTravPath = pTravPath->GetNext();
}
}
return false;
}
//-----------------------------------------------------------------------------
// Deal with teleportation
//-----------------------------------------------------------------------------
void CAI_TrackPather::Teleported()
{
// This updates the paths so they are reasonable
CPathTrack *pClosestTrack = BestPointOnPath( GetDestPathTarget(), WorldSpaceCenter(), 0.0f, false, false );
m_pDestPathTarget = NULL;
MoveToClosestTrackPoint( pClosestTrack );
}
//-----------------------------------------------------------------------------
// Returns distance along path to target, returns FLT_MAX if there's no path
//-----------------------------------------------------------------------------
float CAI_TrackPather::ComputePathDistance( CPathTrack *pPath, CPathTrack *pDest, bool bForward ) const
{
float flDist = 0.0f;
CPathTrack *pLast = pPath;
BEGIN_PATH_TRACK_ITERATION();
while ( CPathTrack::ValidPath( pPath ) )
{
// Ciruclar loop checking
if ( pPath->HasBeenVisited() )
return FLT_MAX;
pPath->Visit();
flDist += pLast->GetAbsOrigin().DistTo( pPath->GetAbsOrigin() );
if ( pDest == pPath )
return flDist;
pLast = pPath;
pPath = bForward ? pPath->GetNext() : pPath->GetPrevious();
}
return FLT_MAX;
}
//-----------------------------------------------------------------------------
// Is pPathTest in "front" of pPath on the same path? (Namely, does GetNext() get us there?)
//-----------------------------------------------------------------------------
bool CAI_TrackPather::IsForwardAlongPath( CPathTrack *pPath, CPathTrack *pPathTest ) const
{
// Also, in the case of looping paths, we want to return the shortest path
float flForwardDist = ComputePathDistance( pPath, pPathTest, true );
float flReverseDist = ComputePathDistance( pPath, pPathTest, false );
Assert( ( flForwardDist != FLT_MAX ) || ( flReverseDist != FLT_MAX ) );
return ( flForwardDist <= flReverseDist );
}
//-----------------------------------------------------------------------------
// Computes distance + nearest point from the current path..
//-----------------------------------------------------------------------------
float CAI_TrackPather::ClosestPointToCurrentPath( Vector *pVecPoint ) const
{
if (!m_pCurrentPathTarget)
{
*pVecPoint = GetAbsOrigin();
return 0;
}
float t;
CalcClosestPointOnLine( GetAbsOrigin(), m_vecSegmentStartPoint,
m_pCurrentPathTarget->GetAbsOrigin(), *pVecPoint, &t );
return t;
}
//-----------------------------------------------------------------------------
// Computes a "path" velocity at a particular point along the current path
//-----------------------------------------------------------------------------
void CAI_TrackPather::ComputePathTangent( float t, Vector *pVecTangent ) const
{
CPathTrack *pNextTrack = NextAlongCurrentPath(m_pCurrentPathTarget);
if ( !pNextTrack )
{
pNextTrack = m_pCurrentPathTarget;
}
t = clamp( t, 0.0f, 1.0f );
pVecTangent->Init(0,0,0);
Catmull_Rom_Spline_Tangent( m_vecSegmentStartSplinePoint, m_vecSegmentStartPoint,
m_pCurrentPathTarget->GetAbsOrigin(), pNextTrack->GetAbsOrigin(), t, *pVecTangent );
VectorNormalize( *pVecTangent );
}
//-----------------------------------------------------------------------------
// Computes the *normalized* velocity at which the helicopter should approach the final point
//-----------------------------------------------------------------------------
void CAI_TrackPather::ComputeNormalizedDestVelocity( Vector *pVecVelocity ) const
{
if ( m_nPauseState != PAUSE_NO_PAUSE )
{
pVecVelocity->Init(0,0,0);
return;
}
CPathTrack *pNextTrack = NextAlongCurrentPath(m_pCurrentPathTarget);
if ( !pNextTrack )
{
pNextTrack = m_pCurrentPathTarget;
}
if ( ( pNextTrack == m_pCurrentPathTarget ) || ( m_pCurrentPathTarget == m_pDestPathTarget ) )
{
pVecVelocity->Init(0,0,0);
return;
}
VectorSubtract( pNextTrack->GetAbsOrigin(), m_pCurrentPathTarget->GetAbsOrigin(), *pVecVelocity );
VectorNormalize( *pVecVelocity );
// Slow it down if we're approaching a sharp corner
Vector vecDelta;
VectorSubtract( m_pCurrentPathTarget->GetAbsOrigin(), m_vecSegmentStartPoint, vecDelta );
VectorNormalize( vecDelta );
float flDot = DotProduct( *pVecVelocity, vecDelta );
*pVecVelocity *= clamp( flDot, 0.0f, 1.0f );
}
//-----------------------------------------------------------------------------
// Purpose:
// Input : &inputdata -
//-----------------------------------------------------------------------------
void CAI_TrackPather::SetTrack( CBaseEntity *pGoalEnt )
{
// Ignore this input if we're *already* on that path.
CPathTrack *pTrack = dynamic_cast<CPathTrack *>(pGoalEnt);
if ( !pTrack )
{
DevWarning( "%s: Specified entity '%s' must be a path_track!\n", pGoalEnt->GetClassname(), pGoalEnt->GetEntityName().ToCStr() );
return;
}
MoveToClosestTrackPoint( pTrack );
}
void CAI_TrackPather::SetTrack( string_t strTrackName )
{
// Find our specified target
CBaseEntity *pGoalEnt = gEntList.FindEntityByName( NULL, strTrackName );
if ( pGoalEnt == NULL )
{
DevWarning( "%s: Could not find path_track '%s'!\n", GetClassname(), STRING( strTrackName ) );
return;
}
SetTrack( pGoalEnt );
}
//-----------------------------------------------------------------------------
// Purpose:
// Input : &inputdata -
//-----------------------------------------------------------------------------
void CAI_TrackPather::InputSetTrack( inputdata_t &inputdata )
{
string_t strTrackName = MAKE_STRING( inputdata.value.String() );
SetTrack( MAKE_STRING( inputdata.value.String() ) );
}
//-----------------------------------------------------------------------------
// Purpose:
// Input : strTrackName -
//-----------------------------------------------------------------------------
void CAI_TrackPather::FlyToPathTrack( string_t strTrackName )
{
CBaseEntity *pGoalEnt = gEntList.FindEntityByName( NULL, strTrackName );
if ( pGoalEnt == NULL )
{
DevWarning( "%s: Could not find path_track '%s'!\n", GetClassname(), STRING( strTrackName ) );
return;
}
// Ignore this input if we're *already* on that path.
CPathTrack *pTrack = dynamic_cast<CPathTrack *>(pGoalEnt);
if ( !pTrack )
{
DevWarning( "%s: Specified entity '%s' must be a path_track!\n", GetClassname(), STRING( strTrackName ) );
return;
}
// Find our specified target
MoveToTrackPoint( pTrack );
}
//-----------------------------------------------------------------------------
// Purpose:
// Input : &inputdata -
//-----------------------------------------------------------------------------
void CAI_TrackPather::InputFlyToPathTrack( inputdata_t &inputdata )
{
// Find our specified target
string_t strTrackName = MAKE_STRING( inputdata.value.String() );
m_nPauseState = PAUSE_NO_PAUSE;
FlyToPathTrack( strTrackName );
}
//-----------------------------------------------------------------------------
// Changes the mode used to determine which path point to move to
//-----------------------------------------------------------------------------
void CAI_TrackPather::InputChooseFarthestPathPoint( inputdata_t &inputdata )
{
UseFarthestPathPoint( true );
}
void CAI_TrackPather::InputChooseNearestPathPoint( inputdata_t &inputdata )
{
UseFarthestPathPoint( false );
}
void CAI_TrackPather::UseFarthestPathPoint( bool useFarthest )
{
m_bChooseFarthestPoint = useFarthest;
}