Chapter 11 examples

Chapter11_StateMachines/Chapter11_StateMachines.cpp

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+#include <stdio.h>
+#include <stdint.h>
+#include <functional>
+#include <vector>
+#include <Windows.h>
+#include <conio.h>
+#include <map>
+
+#include "Game.h"
+
+
+// this our our state definition
+class StateDefinition
+{
+public:
+	StateDefinition(){}
+	~StateDefinition(){}
+	std::function<bool(GameSensors*)> condition;
+	std::function<void(GameSensors*, GameActuators*)> reach;
+};
+
+// set up the state machine
+std::vector<StateDefinition> buildMachine()
+{
+	// build a machine with 10 state definitions
+	std::vector<StateDefinition> stateMachine(2);
+
+	// get the current definition
+	auto curDef = stateMachine.begin();
+
+	// add a state for strong healing
+	curDef->condition = [](GameSensors* sensors) -> bool {
+		static float healAt = 50;
+		if (sensors->detectedStrongHeal())
+		{
+			if (sensors->getStrongHealMaxed())
+			{
+				healAt -= 1;
+			}
+			else
+			{
+				auto newHealAt = 100 - sensors->getStrongHealIncrease();
+				healAt = (healAt + newHealAt) / 2.00f;
+			}
+			sensors->clearStrongHealInfo();
+		}
+		return sensors->getHealthPercent() > healAt;
+	};
+	curDef->reach = [](GameSensors* sensors, GameActuators* actuators) {
+		actuators->strongHeal();
+	};
+	curDef++;
+	
+	// add a state for weak healing
+	curDef->condition = [](GameSensors* sensors) -> bool {
+		static float healAt = 70;
+		static bool hasLearned = false;
+		if (!hasLearned && sensors->detectedWeakHeal())
+		{
+			hasLearned = false;
+			healAt = 100 - sensors->getWeakHealIncrease();
+		}
+		return sensors->getHealthPercent() > healAt;
+	};
+	curDef->reach = [](GameSensors* sensors, GameActuators* actuators) {
+		actuators->weakHeal();
+	};
+	curDef++;
+
+	return stateMachine;
+}
+
+// do the feedback loop
+void doFeedbackLoop(std::vector<StateDefinition> stateMachine)
+{
+	GameSensors sensors;
+	GameActuators actuators;
+
+	while (true)
+	{
+		printf("Current Health %d/%d (%0.00f%%)\n", currentHealth, maximumHealth, sensors.getHealthPercent());
+		for (auto state = stateMachine.begin(); state != stateMachine.end(); state++)
+		{
+			if (!state->condition(&sensors))
+			{
+				state->reach(&sensors, &actuators);
+				break;
+			}
+		}
+		
+		getinput(); // since there's no actual game, this just allows you to change the state of the game to see how the feedback loop behaves
+		Sleep(1000);
+	}
+}
+
+int main (int argc, char *argv[])
+{
+	printf("Type a number to decrease health by that much. EG '2' dreaces health by 2. Press any other key to do nothing.\n");
+	doFeedbackLoop(buildMachine());
+	return 0;
+}