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int iPlayerMaxHeight = iPlayerY - 50;
if(dbUpKey () == 1){
  int y = dbSpriteY(i);
  do{
     iPlayerY -= iPlayerSpeed;
     dbSprite(i, dbSpriteX(i), iPlayerY, i); // go up
     y--;
  }while(y < iPlayerMaxHeight);
}

//Global function. 0 = ground, 1 = jump, 2 = fall.
int jump = 0;
int iPlayerMaxHeight = 0;

void player()
{
	int y = dbSpriteY(i);
	if(dbUpKey () == 1 && jump == 0)
	{
		jump = 1;
		iPlayerMaxHeight = y - 50;
	}
	
	if(jump == 1)
	{
		y -= 1; // go up
		if(y > iPlayerMaxHeight)
		{
			jump = 2;
		}
	}
	if(jump == 2)
	{
		y += 1; // go down
		if(dbSpriteCollision(i, 0) > 0)
		{
			jump = 0;
		}
	}
        dbSprite(i, dbSpriteX(i), y, i);
}

float angX = dbCOS(x);
float angY = dbSIN(x);

if( dbUpKey () == 1 && dbRightKey () == 1 )
{
  .
  .
  .

dbSprite(i, dbSpriteX(i) + angX, dbSpriteY(i) + angY, i);

}

class Gravity // G = 9.8 m/s
{
public:
	Gravity(const int NumCreatures)
	{
		V = new float[NumCreatures];
		T = new float[NumCreatures];
	}

	~Gravity()
	{
		delete[] V;
		delete[] T;
	}

	
	// Set
	inline void SetVelocity(const float Velocity) { V[m_Creature] = Velocity; }
	inline void SetTime(const float Time) { T[m_Creature] = Time; }
	inline void SetCurrentCreature(const int Creature) { m_Creature = (Creature-1); }
	
	// Gravity Equations for Upward Motion
	inline float UpVelocityAtAnyTime(void) const { return (V[m_Creature] - (G * (T[m_Creature]))); }
	inline float UpTimeToReachPeak(void) const { return (V[m_Creature] / G); }
	inline float UpMaximumHeight(void) const { return ( pow(V[m_Creature],2) / (G * 2) ); } 

	// Gravity Equations for Falling Objects
	inline float DownVelocity(void) const { return (G * (T[m_Creature])); }
	inline float DownDistanceInFall(void) const { return ( (G * pow(T[m_Creature],2) ) / 2 ); }
	inline float DownReachingGivenVelocity(void) const { return ( (pow(V[m_Creature],2) ) / (2 * G) ); }
	inline float DownTimeToFallDistance(const float Height) const { return ( sqrt( (2 * Height) / G ) ); }

private:
	float* V, *T; 
	int m_Creature;
};

const float foot =  0.30480f;
void Rise()
{
	float I = 0;
	
	for(; I <= m_pGravity->UpTimeToReachPeak(); I += .1)
	{

		// Set Time
		m_pGravity->SetTime(I);

		//Movement
		if(LEFT) MoveLeft();
		else if(RIGHT) MoveRight();
 
                //May need to put a negative sign before m_pGravity depending what function you use.
                //Move up (m_pGravity->UpVelocityAtAnyTime() * foot )

		//Update Screen
		dbSync();
		}
	}

const float foot =  0.30480f;
float I = 0;

while(We don't hit the ground)
{

	I += 0.1;

        //Set Time
	m_pGravity->SetTime(I);

	//Movement
	if(LEFT) MoveLeft();
	else if(RIGHT) MoveRight();

        //May need to put a negative sign before m_pGravity depending what function you use.
        //Move down (m_pGravity->DownVelocity() * foot)

	dbSync();

		}