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engines/hpl1/engine/ai/StateMachine.cpp

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+/* ScummVM - Graphic Adventure Engine
+ *
+ * ScummVM is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+/*
+ * Copyright (C) 2006-2010 - Frictional Games
+ *
+ * This file is part of HPL1 Engine.
+ */
+
+#include "hpl1/engine/ai/StateMachine.h"
+
+#include "hpl1/engine/system/low_level_system.h"
+
+namespace hpl {
+
+//////////////////////////////////////////////////////////////////////////
+// STATE
+//////////////////////////////////////////////////////////////////////////
+
+//-----------------------------------------------------------------------
+
+iAIState::iAIState() {
+	mfTimeCount = 0;
+}
+
+//-----------------------------------------------------------------------
+
+void iAIState::Sleep(float afTime) {
+}
+
+//-----------------------------------------------------------------------
+
+void iAIState::Update(float afTime) {
+	// Update according to the time step
+	mfTimeCount += afTime;
+	while (mfTimeCount >= mfUpdateStep) {
+		OnUpdate(mfUpdateStep);
+		mfTimeCount -= mfUpdateStep;
+	}
+}
+
+//-----------------------------------------------------------------------
+
+//////////////////////////////////////////////////////////////////////////
+// CONSTRUCTORS
+//////////////////////////////////////////////////////////////////////////
+
+//-----------------------------------------------------------------------
+
+cStateMachine::cStateMachine() {
+	mbActive = true;
+
+	mpCurrentState = NULL;
+}
+
+//-----------------------------------------------------------------------
+
+cStateMachine::~cStateMachine() {
+	STLMapDeleteAll(m_mapStates);
+}
+
+//-----------------------------------------------------------------------
+
+//////////////////////////////////////////////////////////////////////////
+// PUBLIC METHODS
+//////////////////////////////////////////////////////////////////////////
+
+//-----------------------------------------------------------------------
+
+void cStateMachine::Update(float afTime) {
+	if (mbActive == false || mpCurrentState == NULL)
+		return;
+
+	mpCurrentState->Update(afTime);
+}
+
+//-----------------------------------------------------------------------
+
+void cStateMachine::AddState(iAIState *apState, const tString &asName, int alId, float afUpdateStep) {
+	apState->SetStateMachine(this);
+	apState->mlId = alId;
+	apState->msName = asName;
+	apState->mfUpdateStep = afUpdateStep;
+
+	if (m_mapStates.empty())
+		mpCurrentState = apState;
+
+	m_mapStates.insert(tAIStateMap::value_type(alId, apState));
+}
+
+//-----------------------------------------------------------------------
+
+void cStateMachine::ChangeState(int alId) {
+	if (alId == mpCurrentState->GetId())
+		return;
+
+	iAIState *pState = GetState(alId);
+	if (pState == NULL) {
+		Warning("State %d does not exist!\n", alId);
+		return;
+	}
+
+	mpCurrentState->OnLeaveState(pState->GetId());
+	pState->OnEnterState(mpCurrentState == NULL ? -1 : mpCurrentState->GetId());
+
+	mpCurrentState = pState;
+}
+
+//-----------------------------------------------------------------------
+
+iAIState *cStateMachine::GetState(int alId) {
+	tAIStateMapIt it = m_mapStates.find(alId);
+	if (it == m_mapStates.end())
+		return NULL;
+
+	return it->second;
+}
+//-----------------------------------------------------------------------
+
+iAIState *cStateMachine::CurrentState() {
+	return mpCurrentState;
+}
+
+//-----------------------------------------------------------------------
+} // namespace hpl