www.pudn.com > ATimeToKill.rar > sod.cpp

#include "sod.h" 
#include "rocket.h" 
 
/* 
	SOD.CPP 
 
	The CSodEnemy class implementation 
 
	OpenGL Game Programming 
	Author: Kevin Hawkins 
	Date: 3/30/2001 
	Description: 
 
*/ 
 
void CSodEnemy::OnCollision(CObject *collisionObject) 
{ 
		// as long as the model is not dying, it can collide with other objects 
	if (modelState != MODEL_DIE) 
	{ 
		// if this enemy collides with another enemy 
		if ((typeid(*collisionObject) == typeid(CSodEnemy)) || 
			(typeid(*collisionObject) == typeid(COgroEnemy))) 
		{ 
			aiState = AI_UNCARING; 
		} 
 
		// if this enemy collides with the terrain (always) 
		else	if (typeid(*collisionObject) == typeid(CTerrain)) 
		{ 
			position.y = ((CTerrain*)collisionObject)->GetHeight(position.x, position.z) + size; 
			if (position.x <= ((CTerrain*)collisionObject)->GetScanDepth()) 
				position.x = ((CTerrain*)collisionObject)->GetScanDepth(); 
			if (position.x >= ((CTerrain*)collisionObject)->GetWidth()*((CTerrain*)collisionObject)->GetMul() - ((CTerrain*)collisionObject)->GetScanDepth()) 
				position.x = ((CTerrain*)collisionObject)->GetWidth()*((CTerrain*)collisionObject)->GetMul() - ((CTerrain*)collisionObject)->GetScanDepth(); 
			if (position.z <= ((CTerrain*)collisionObject)->GetScanDepth()) 
				position.z = ((CTerrain*)collisionObject)->GetScanDepth(); 
			if (position.z >= ((CTerrain*)collisionObject)->GetWidth()*((CTerrain*)collisionObject)->GetMul() - ((CTerrain*)collisionObject)->GetScanDepth()) 
				position.z = ((CTerrain*)collisionObject)->GetWidth()*((CTerrain*)collisionObject)->GetMul() - ((CTerrain*)collisionObject)->GetScanDepth(); 
		} 
		else if (typeid(*collisionObject) == typeid(CRocket)) 
		{ 
			// kill the ogre 
			aiState = AI_DEAD; 
			velocity = CVector(0.0, 0.0, 0.0); 
		} 
	} 
} 
 
void CSodEnemy::OnPrepare()  
{ 
	float dirToPlayer;	// the angle of the enemy-player vector 
 
	CVector diff;		// the vector from the enemy to the player 
	diff.x = position.x - player->position.x; 
	diff.z = position.z - player->position.z; 
	diff.Normalize(); 
 
	// find the angle in the world of the vector from the enemy to the player 
	// in relation the negative z-axis 
	dirToPlayer = RAD2DEG(diff.Angle(CVector(0,0,-1))); 
 
	// seed random generator 
	srand((unsigned int)time(NULL)); 
 
	ProcessAI(); 
	// now do Ogro prep 
	// set modelState based on AIstate 
	// if AI_SCARED, then MODEL_RUN 
	switch (aiState) 
	{ 
	case AI_SCARED: 
		direction = (dirToPlayer - 90) + ((rand()%30)-15);		// set the direction of the enemy 
		modelState = MODEL_RUN; 
		velocity = CVector(0.0, 0.0, 15.0); 
		break; 
	case AI_UNCARING: 
		direction = float(rand() % 360); 
		if ((rand() % 3) != 0) 
		{ 
			modelState = MODEL_IDLE; 
			velocity = CVector(0.0, 0.0, 0.0); 
		} 
		else 
		{ 
			velocity = CVector(0.0, 0.0, 15.0); 
			modelState = MODEL_RUN; 
		} 
		break; 
	case AI_DEAD: 
		modelState = MODEL_DIE; 
		velocity = CVector(0.0, 0.0, 0.0); 
		if (nextFrame == stateStart) 
			// time to kill the monster 
		{ 
			isDead = true; 
		} 
		break; 
	default: 
		break; 
	} 
 
	// do prep for MD2 Model states 
	CEntity::OnPrepare(); 
} 
 
void CSodEnemy::Load() 
{ 
	// load model 
	CMD2Model::Load("models\\sodf8\\tris.md2", "models\\sodf8\\abarlith.pcx"); 
} 
 
void CSodEnemy::OnProcessAI() 
{ 
	// calculate distance from player 
	CVector diff = player->position - position; 
 
	if (aiState != AI_DEAD) 
	{ 
		distFromPlayer = sqrt(diff.x*diff.x + diff.y*diff.y + diff.z*diff.z); 
		if (distFromPlayer < 125.0) 
			aiState = AI_SCARED; 
		else 
			aiState = AI_UNCARING; 
	} 
}