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107 lines
3.6 KiB
107 lines
3.6 KiB
5 years ago
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// NextBotPathFollow.h
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// Path following
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// Author: Michael Booth, April 2005
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//========= Copyright Valve Corporation, All rights reserved. ============//
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#ifndef _NEXT_BOT_PATH_FOLLOWER_
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#define _NEXT_BOT_PATH_FOLLOWER_
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#include "nav_mesh.h"
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#include "nav_pathfind.h"
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#include "NextBotPath.h"
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class INextBot;
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class ILocomotion;
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//--------------------------------------------------------------------------------------------------------
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/**
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* A PathFollower extends a Path to include mechanisms to move along (follow) it
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*/
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class PathFollower : public Path
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{
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public:
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PathFollower( void );
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virtual ~PathFollower();
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virtual void Invalidate( void ); // (EXTEND) cause the path to become invalid
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virtual void Draw( const Path::Segment *start = NULL ) const; // (EXTEND) draw the path for debugging
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virtual void OnPathChanged( INextBot *bot, Path::ResultType result ); // invoked when the path is (re)computed (path is valid at the time of this call)
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virtual void Update( INextBot *bot ); // move bot along path
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virtual const Path::Segment *GetCurrentGoal( void ) const; // return current goal along the path we are trying to reach
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virtual void SetMinLookAheadDistance( float value ); // minimum range movement goal must be along path
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virtual CBaseEntity *GetHindrance( void ) const; // returns entity that is hindering our progress along the path
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virtual bool IsDiscontinuityAhead( INextBot *bot, Path::SegmentType type, float range = -1.0f ) const; // return true if there is a the given discontinuity ahead in the path within the given range (-1 = entire remaining path)
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void SetGoalTolerance( float range ); // set tolerance within at which we're considered to be at our goal
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private:
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const Path::Segment *m_goal; // our current goal along the path
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float m_minLookAheadRange;
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bool CheckProgress( INextBot *bot );
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bool IsAtGoal( INextBot *bot ) const; // return true if reached current path goal
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//bool IsOnStairs( INextBot *bot ) const; // return true if bot is standing on a stairway
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bool m_isOnStairs;
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CountdownTimer m_avoidTimer; // do avoid check more often if we recently avoided
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CountdownTimer m_waitTimer; // for waiting for a blocker to move off our path
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CHandle< CBaseEntity > m_hindrance;
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// debug display data for avoid volumes
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bool m_didAvoidCheck;
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Vector m_leftFrom;
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Vector m_leftTo;
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bool m_isLeftClear;
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Vector m_rightFrom;
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Vector m_rightTo;
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bool m_isRightClear;
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Vector m_hullMin, m_hullMax;
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void AdjustSpeed( INextBot *bot ); // adjust speed based on path curvature
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Vector Avoid( INextBot *bot, const Vector &goalPos, const Vector &forward, const Vector &left ); // avoidance movements for very nearby obstacles. returns modified goal position
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bool Climbing( INextBot *bot, const Path::Segment *goal, const Vector &forward, const Vector &left, float goalRange ); // climb up ledges
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bool JumpOverGaps( INextBot *bot, const Path::Segment *goal, const Vector &forward, const Vector &left, float goalRange ); // jump over gaps
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bool LadderUpdate( INextBot *bot ); // move bot along ladder
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CBaseEntity *FindBlocker( INextBot *bot ); // if entity is returned, it is blocking us from continuing along our path
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float m_goalTolerance;
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};
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inline void PathFollower::SetGoalTolerance( float range )
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{
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m_goalTolerance = range;
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}
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inline const Path::Segment *PathFollower::GetCurrentGoal( void ) const
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{
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return m_goal;
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}
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inline void PathFollower::SetMinLookAheadDistance( float value )
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{
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m_minLookAheadRange = value;
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}
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inline CBaseEntity *PathFollower::GetHindrance( void ) const
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{
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return m_hindrance;
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}
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#endif // _NEXT_BOT_PATH_FOLLOWER_
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