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//========= Copyright Valve Corporation, All rights reserved. ============//
// tf_path_follower.cpp
// Simplified path following for TF2
// Author: Michael Booth, November 2010
#include "cbase.h"
#include "NextBotManager.h"
#include "tf_path_follower.h"
// memdbgon must be the last include file in a .cpp file!!!
#include "tier0/memdbgon.h"
//--------------------------------------------------------------------------------------------------------------
/**
* Constructor
*/
CTFPathFollower::CTFPathFollower( void )
{
m_goal = NULL;
m_minLookAheadRange = 300.0f;
}
//--------------------------------------------------------------------------------------------------------------
CTFPathFollower::~CTFPathFollower()
{
// allow bots to detach pointer to me
CUtlVector< INextBot * > botVector;
TheNextBots().CollectAllBots( &botVector );
for( int i=0; i<botVector.Count(); ++i )
{
botVector[i]->NotifyPathDestruction( this );
}
}
//--------------------------------------------------------------------------------------------------------------
/**
* When the path is invalidated, the follower is also reset
*/
void CTFPathFollower::Invalidate( void )
{
// extend
Path::Invalidate();
m_goal = NULL;
MoveCursorToStart();
}
//--------------------------------------------------------------------------------------------------------------
/**
* Invoked when the path is (re)computed (path is valid at the time of this call)
*/
void CTFPathFollower::OnPathChanged( INextBot *bot, Path::ResultType result )
{
// start from the beginning
m_goal = FirstSegment();
MoveCursorToStart();
}
//--------------------------------------------------------------------------------------------------------------
/**
* Move mover along path
*/
void CTFPathFollower::Update( INextBot *bot )
{
VPROF_BUDGET( "CTFPathFollower::Update", "NextBot" );
ILocomotion *mover = bot->GetLocomotionInterface();
// track most recent path followed
bot->SetCurrentPath( this );
if ( !IsValid() || m_goal == NULL )
{
return;
}
// check if we've reached the end of the path
const float nearRange = 25.0f;
if ( mover->IsOnGround() && ( GetEndPosition() - mover->GetFeet() ).AsVector2D().IsLengthLessThan( nearRange ) )
{
// the end of the path has been reached
mover->GetBot()->OnMoveToSuccess( this );
if ( bot->IsDebugging( NEXTBOT_PATH ) )
{
DevMsg( "CTFPathFollower: OnMoveToSuccess\n" );
}
// don't invalidate if OnMoveToSuccess just recomputed a new path
if ( GetAge() > 0.0f )
{
Invalidate();
}
return;
}
// move along the path
MoveCursorToClosestPosition( mover->GetFeet(), SEEK_AHEAD );
float myCursorPosition = GetCursorPosition();
const Path::Data &data = GetCursorData();
if ( !data.segmentPrior )
{
// this shouldn't happen
mover->GetBot()->OnMoveToFailure( this, FAIL_STUCK );
Invalidate();
return;
}
// set goal to be just ahead of wherever we happen to be on the path
m_goal = NextSegment( data.segmentPrior );
if ( !m_goal )
{
m_goal = data.segmentPrior;
}
// find actual move-to position farther down the path
Vector moveToPos = m_goal->pos;
// follow point farther down the path to smooth out our movement
for( float ahead = m_minLookAheadRange; ahead > 0.0f; ahead -= 50.0f )
{
MoveCursor( myCursorPosition, PATH_ABSOLUTE_DISTANCE );
MoveCursor( ahead, PATH_RELATIVE_DISTANCE );
// get path data at this lookahead point
const Path::Data &data = GetCursorData();
if ( mover->IsPotentiallyTraversable( mover->GetFeet(), data.pos ) )
{
moveToPos = data.pos;
break;
}
}
// move bot along path
mover->FaceTowards( moveToPos );
mover->Approach( moveToPos );
// debug display
if ( bot->IsDebugging( NEXTBOT_PATH ) )
{
Path::Draw();
NDebugOverlay::Cross3D( moveToPos, 5.0f, 150, 150, 255, true, 0.1f );
NDebugOverlay::Line( bot->GetEntity()->WorldSpaceCenter(), moveToPos, 255, 255, 0, true, 0.1f );
}
}
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