A class for an OpenGL directional light. The inherited mRotation quaternion is used (in contrast to cLight) - it modifies the light's direction.

Source:

../src/cSpotLight.hh:35

public cSpotLight ( cEventDispatcher * disp ,
                    const char * name = NULL ) ;

default constructor

public cSpotLight ( cEventDispatcher * disp ,
                    const cVertex & pos ,
                    const cVertex & dir ,
                    const char * name = NULL ) ;

constructor with initialization of position and name

public cSpotLight ( cEventDispatcher * disp ,
                    const cVertex & pos ,
                    const cVertex & dir ,
                    const teLightState state = LIGHT_ON ,
                    const char * name = NULL ) ;

constructor with initialization of position, state and name

public cSpotLight ( cEventDispatcher * disp ,
                    const cVertex & pos ,
                    const cVertex & dir ,
                    const cADSEColor & col ,
                    const teLightState state = LIGHT_ON ,
                    const char * name = NULL ) ;

constructor with initialization of position, color, state and name

public virtual ~ cSpotLight ( ) ;

destructor

protected cVertex mDirection

actual direction

protected GLfloat mCutOff

current cutoff

protected GLfloat mExponent

current exponent

protected GLfloat mOldCutOff

saved cutoff

protected GLfloat mOldExponent

saved exponent

public virtual void SetDirection ( const cVertex & dir ) ;

set new direction to point to

public virtual void SetCutOff ( const GLfloat cutoff ) ;

set new cutoff

public virtual void SetExponent ( const GLfloat exponent ) ;

set new light distribution exponent

public virtual int ReceiveEvent ( const cEvent & event ) ;

event receiver - we listen for switchon/switchoff events

Return:

0 - event accepted, -1 - event not accepted

protected virtual void ActivateLight ( ) ;

this one performs the actual set up of the light

(called by Activate()); separeted to simplify cSpotLight

protected virtual void DrawThisObject ( ) ;

A light is a visible object therefore it needs a drawing function

Not used here - a SpotLight cannot be drawn!

protected virtual void DeactivateLight ( ) ;

restore old cutoff/exponent (called by cLight::Deactivate())

protected virtual void SubscribeToActiveEvents ( ) ;

we want to get events for altering cutoff/exponent

protected virtual void UnsubscribeFromActiveEvents ( ) ;

unsubscribe from events if we get deselected

protected virtual const char * GetDefaultName ( ) const ;

identify an instance of this class if it's got no name