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game/server/NextBot/NextBotIntentionInterface.cpp

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+// NextBotIntentionInterface.cpp
+// Interface for intentional thinking
+// Author: Michael Booth, November 2007
+//========= Copyright Valve Corporation, All rights reserved. ============//
+
+#include "cbase.h"
+
+#include "NextBotInterface.h"
+#include "NextBotIntentionInterface.h"
+
+// memdbgon must be the last include file in a .cpp file!!!
+#include "tier0/memdbgon.h"
+
+
+//------------------------------------------------------------------------------------------------------------------------
+/**
+ * Given a subject, return the world space position we should aim at
+ */
+Vector IIntention::SelectTargetPoint( const INextBot *me, const CBaseCombatCharacter *subject ) const
+{
+	for ( INextBotEventResponder *sub = FirstContainedResponder(); sub; sub = NextContainedResponder( sub ) )
+	{
+		const IContextualQuery *query = dynamic_cast< const IContextualQuery * >( sub );
+		if ( query )
+		{
+			// return the response of the first responder that gives a definitive answer
+			Vector result = query->SelectTargetPoint( me, subject );
+			if ( result != vec3_origin )
+			{
+				return result;
+			}
+		}
+	}	
+
+	// no answer, use a reasonable position
+	Vector threatMins, threatMaxs;
+	subject->CollisionProp()->WorldSpaceAABB( &threatMins, &threatMaxs );
+	Vector targetPoint = subject->GetAbsOrigin();
+	targetPoint.z += 0.7f * ( threatMaxs.z - threatMins.z );
+
+	return targetPoint;
+}
+
+
+//------------------------------------------------------------------------------------------------------------------------
+/**
+ * Given two threats, decide which one is more dangerous
+ */
+const CKnownEntity *IIntention::SelectMoreDangerousThreat( const INextBot *me, const CBaseCombatCharacter *subject, const CKnownEntity *threat1, const CKnownEntity *threat2 ) const
+{
+	if ( !threat1 || threat1->IsObsolete() )
+	{
+		if ( threat2 && !threat2->IsObsolete() )
+			return threat2;
+
+		return NULL;
+	}
+	else if ( !threat2 || threat2->IsObsolete() )
+	{
+		return threat1;
+	}
+
+	for ( INextBotEventResponder *sub = FirstContainedResponder(); sub; sub = NextContainedResponder( sub ) )
+	{
+		const IContextualQuery *query = dynamic_cast< const IContextualQuery * >( sub );
+		if ( query )
+		{
+			// return the response of the first responder that gives a definitive answer
+			const CKnownEntity *result = query->SelectMoreDangerousThreat( me, subject, threat1, threat2 );
+			if ( result )
+			{
+				return result;
+			}
+		}
+	}
+
+	// no specific decision was made - return closest threat as most dangerous
+	float range1 = ( subject->GetAbsOrigin() - threat1->GetLastKnownPosition() ).LengthSqr();
+	float range2 = ( subject->GetAbsOrigin() - threat2->GetLastKnownPosition() ).LengthSqr();
+
+	if ( range1 < range2 )
+	{
+		return threat1;
+	}
+
+	return threat2;
+}
+
+
+
+