Das Tank: PSystem Class Reference

Definition at line 60 of file PSystem.h.


Public Member Functions
	PSystem (void)
	default constructor
	PSystem (Vector vPos, Vector vFce, float fSAngle, float fFric, float fRand, int iParticles)
	general constructor
	~PSystem (void)
	remove the particle system
void	Draw (void)
	draws the particle system in it's current state
bool	Step (float timeStep)
	advance the state of the particle system
void	SetColor (float r, float g, float b)
	set the color used to draw the particle system
Public Attributes
Vector	vPosition
	absolute position of the particle system's origin
Vector	vForce
	magnitude and direction of the system's particles (at initialization time)
float	fSpreadAngle
	velocities of particles deviate this much from the force vector's direction
float	fFriction
	rate at which particles are slowed by the effect of air friction
int	iNumParticles
	the number of particles in the system
Particle *	pParticles
	pointer to a list of particles contained in the system
float	fRandomness
	amount of randomness introduced to the particles' force vectors
float	fDecayRate
	rate at which particles lose energy
float	fColorR
	red color component intensity of the particle system
float	fColorG
	green color component intensity of the particle system
float	fColorB
	blue color component intensity of the particle system

Constructor & Destructor Documentation

PSystem::PSystem ( void )

Initialize the particle system with default values. The default number of Particles is one (1), and so using this constructor is generally not very useful.

Definition at line 29 of file PSystem.cpp.

References Particle::bAlive, Particle::fAngle, fColorB, fColorG, fColorR, fDecayRate, Particle::fEnergy, fFriction, Particle::fPosY, fRandomness, Particle::fRotVel, Particle::fSize, fSpreadAngle, Particle::fVelX, Particle::fVelY, iNumParticles, PI, pParticles, vForce, vPosition, Vector::x, Vector::y, and Vector::z.

PSystem::PSystem	(	Vector	vPos,
		Vector	vFce,
		float	fSAngle,
		float	fFric,
		float	fRand,
		int	iParticles
	)

Initialize the particle system with specific initial values. Note that the class member (int) iNumParticles will be clamped to a maximum value of MAX_PARTICLES.

Definition at line 70 of file PSystem.cpp.

References Particle::bAlive, Particle::fAngle, fColorB, fColorG, fColorR, Particle::fDecayRate, fDecayRate, Particle::fEnergy, fFriction, Particle::fPosX, Particle::fPosY, fRandomness, Particle::fRotVel, Particle::fSize, fSpreadAngle, Particle::fVelX, Particle::fVelY, iNumParticles, MAX_PARTICLES, pParticles, vForce, vPosition, VRotate2D(), Vector::x, and Vector::y.

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PSystem::~PSystem ( void )

This function is the default destructor, which frees the memory allocated to holding the particle structure data.

Definition at line 120 of file PSystem.cpp.

References pParticles.

Member Function Documentation

void PSystem::Draw ( void )

This function draws the particle system to the screen. The particle geometry currently consists of simple triangles to simulate 'sparks' when drawn. This function will retrieve each particle's position, orientation, and energy (used for determining the transparency value) in order to render the particle. An overall particle system color is used to select the drawing color used for the triangle representing each particle.

Definition at line 174 of file PSystem.cpp.

References fColorB, fColorG, fColorR, iNumParticles, and pParticles.

Referenced by CEffect::Draw().

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bool PSystem::Step ( float timeStep )

Step the particle system forward in time by a specified amount. This will update particles' position, orientation, etc. and prepare the particle system for being drawn to the screen. This function may change the boolean member bParticlesExpired to indicate when the energy of all particles in the system has reached zero.

Definition at line 131 of file PSystem.cpp.

References Particle::fAngle, fDecayRate, Particle::fEnergy, fFriction, Particle::fPosX, Particle::fPosY, Particle::fRotVel, Particle::fVelX, Particle::fVelY, iNumParticles, and pParticles.

Referenced by CEffect::Step().

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