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# Ogre::ParticleAffector Class Reference

Abstract class defining the interface to be implemented by particle affectors. More...

`#include <OgreParticleAffector.h>`

Inheritance diagram for Ogre::ParticleAffector:

[legend]
List of all members.

## Public Member Functions
| ParticleAffector (ParticleSystem *parent)
virtual | ~ParticleAffector ()
| Virtual destructor essential.
virtual void | _initParticle (Particle *pParticle)
| Method called to allow the affector to initialize all newly created particles in the system.
virtual void | _affectParticles (ParticleSystem *pSystem, Real timeElapsed)=0
| Method called to allow the affector to 'do it's stuff' on all active particles in the system.
const String & | getType (void) const
| Returns the name of the type of affector.
ParamDictionary * | getParamDictionary (void)
| Retrieves the parameter dictionary for this class.
const ParamDictionary * | getParamDictionary (void) const
const ParameterList & | getParameters (void) const
| Retrieves a list of parameters valid for this object.
virtual bool | setParameter (const String &name, const String &value)
| Generic parameter setting method.
virtual void | setParameterList (const NameValuePairList &paramList)
| Generic multiple parameter setting method.
virtual String | getParameter (const String &name) const
| Generic parameter retrieval method.
virtual void | copyParametersTo (StringInterface *dest) const
| Method for copying this object's parameters to another object.
## Static Public Member Functions
static void | cleanupDictionary ()
| Cleans up the static 'msDictionary' required to reset Ogre, otherwise the containers are left with invalid pointers, which will lead to a crash as soon as one of the ResourceManager implementers (e.g.
## Protected Member Functions
void | addBaseParameters (void)
| Internal method for setting up the basic parameter definitions for a subclass.
bool | createParamDictionary (const String &className)
| Internal method for creating a parameter dictionary for the class, if it does not already exist.
## Protected Attributes
String | mType
| Name of the type of affector, MUST be initialised by subclasses.
ParticleSystem * | mParent
String | mParamDictName
| Class name for this instance to be used as a lookup (must be initialised by subclasses).
## Static Protected Attributes
static ParamDictionaryMap | msDictionary
| Dictionary of parameters.

## Detailed Description

Abstract class defining the interface to be implemented by particle affectors.

Remarks:
  Particle affectors modify particles in a particle system over their lifetime. They can be grouped into types, e.g. 'vector force' affectors, 'fader' affectors etc; each type will modify particles in a different way, using different parameters.

  Because there are so many types of affectors you could use, OGRE chooses not to dictate the available types. It comes with some in-built, but allows plugins or applications to extend the affector types available. This is done by subclassing ParticleAffector to have the appropriate emission behaviour you want, and also creating a subclass of ParticleAffectorFactory which is responsible for creating instances of your new affector type. You register this factory with the ParticleSystemManager using addAffectorFactory, and from then on affectors of this type can be created either from code or through text particle scripts by naming the type.

  This same approach is used for ParticleEmitters (which are the source of particles in a system). This means that OGRE is particularly flexible when it comes to creating particle system effects, with literally infinite combinations of affector and affector types, and paramters within those types.

Definition at line 58 of file OgreParticleAffector.h.

## Constructor & Destructor Documentation

Ogre::ParticleAffector::ParticleAffector | ( | ParticleSystem * | parent | ) |

| Definition at line 76 of file OgreParticleAffector.h.

virtual Ogre::ParticleAffector::~ParticleAffector | ( |  | ) | `[virtual]`

| Virtual destructor essential.

## Member Function Documentation

virtual void Ogre::ParticleAffector::_affectParticles | ( | ParticleSystem * | pSystem,
|  | Real | timeElapsed
| ) | `[pure virtual]`

  | Method called to allow the affector to 'do it's stuff' on all active particles in the system. Remarks: This is where the affector gets the chance to apply it's effects to the particles of a system. The affector is expected to apply it's effect to some or all of the particles in the system passed to it, depending on the affector's approach. Parameters:
  | pSystem | Pointer to a ParticleSystem to affect.
  | timeElapsed | The number of seconds which have elapsed since the last call.

virtual void Ogre::ParticleAffector::_initParticle | ( | Particle * | pParticle | ) | `[virtual]`

  | Method called to allow the affector to initialize all newly created particles in the system. Remarks: This is where the affector gets the chance to initialize it's effects to the particles of a system. The affector is expected to initialize some or all of the particles in the system passed to it, depending on the affector's approach. Parameters:
  | pParticle | Pointer to a Particle to initialize.
Definition at line 89 of file OgreParticleAffector.h.

void Ogre::ParticleAffector::addBaseParameters | ( | void |  | ) | `[protected]`

| Internal method for setting up the basic parameter definitions for a subclass. Remarks: Because StringInterface holds a dictionary of parameters per class, subclasses need to call this to ask the base class to add it's parameters to their dictionary as well. Can't do this in the constructor because that runs in a non-virtual context. The subclass must have called it's own createParamDictionary before calling this method. Definition at line 72 of file OgreParticleAffector.h.

static void Ogre::StringInterface::cleanupDictionary | ( |  | ) | `[static, inherited]`

| Cleans up the static 'msDictionary' required to reset Ogre, otherwise the containers are left with invalid pointers, which will lead to a crash as soon as one of the ResourceManager implementers (e.g. MaterialManager) initializes.

virtual void Ogre::StringInterface::copyParametersTo | ( | StringInterface * | dest | ) | const`[virtual, inherited]`

  | Method for copying this object's parameters to another object. Remarks: This method takes the values of all the object's parameters and tries to set the same values on the destination object. This provides a completely type independent way to copy parameters to other objects. Note that because of the String manipulation involved, this should not be regarded as an efficient process and should be saved for times outside of the rendering loop. Any unrecognised parameters will be ignored as with setParameter method. Parameters:
  | dest | Pointer to object to have it's parameters set the same as this object.
Definition at line 300 of file OgreStringInterface.h. References Ogre::ParamDictionary::mParamDefs.

bool Ogre::StringInterface::createParamDictionary | ( | const String & | className | ) | `[protected, inherited]`

  | Internal method for creating a parameter dictionary for the class, if it does not already exist. Remarks: This method will check to see if a parameter dictionary exist for this class yet, and if not will create one. NB you must supply the name of the class (RTTI is not used or performance). Parameters:
  | className | the name of the class using the dictionary
Returns: true if a new dictionary was created, false if it was already there Definition at line 176 of file OgreStringInterface.h.

const ParamDictionary* Ogre::StringInterface::getParamDictionary | ( | void |  | ) | const`[inherited]`

| Definition at line 213 of file OgreStringInterface.h.

ParamDictionary* Ogre::StringInterface::getParamDictionary | ( | void |  | ) | `[inherited]`

| Retrieves the parameter dictionary for this class. Remarks: Only valid to call this after createParamDictionary. Returns: Pointer to ParamDictionary shared by all instances of this class which you can add parameters to, retrieve parameters etc. Definition at line 200 of file OgreStringInterface.h.

virtual String Ogre::StringInterface::getParameter | ( | const String & | name | ) | const`[virtual, inherited]`

  | Generic parameter retrieval method. Remarks: Call this method with the name of a parameter to retrieve a string-format value of the parameter in question. If in doubt, check the parameter definition in the list returned from getParameters for the type of this parameter. If you like you can use StringConverter to convert this string back into a native type. Parameters:
  | name | The name of the parameter to get
Returns: String value of parameter, blank if not found Definition at line 269 of file OgreStringInterface.h. References Ogre::ParamCommand::doGet(), and Ogre::ParamDictionary::getParamCommand().

const ParameterList& Ogre::StringInterface::getParameters | ( | void |  | ) | const`[inherited]`

| Retrieves a list of parameters valid for this object. Returns: A reference to a static list of ParameterDef objects.

const String& Ogre::ParticleAffector::getType | ( | void |  | ) | const

| Returns the name of the type of affector. Remarks: This property is useful for determining the type of affector procedurally so another can be created. Definition at line 108 of file OgreParticleAffector.h.

virtual bool Ogre::StringInterface::setParameter | ( | const String & | name,
|  | const String & | value
| ) | `[virtual, inherited]`

  | Generic parameter setting method. Remarks: Call this method with the name of a parameter and a string version of the value to set. The implementor will convert the string to a native type internally. If in doubt, check the parameter definition in the list returned from StringInterface::getParameters. Parameters:
  | name | The name of the parameter to set
  | value | String value. Must be in the right format for the type specified in the parameter definition. See the StringConverter class for more information.
Returns: true if set was successful, false otherwise (NB no exceptions thrown - tolerant method)

virtual void Ogre::StringInterface::setParameterList | ( | const NameValuePairList & | paramList | ) | `[virtual, inherited]`

  | Generic multiple parameter setting method. Remarks: Call this method with a list of name / value pairs to set. The implementor will convert the string to a native type internally. If in doubt, check the parameter definition in the list returned from StringInterface::getParameters. Parameters:
  | paramList | Name/value pair list

## Member Data Documentation

String Ogre::StringInterface::mParamDictName`[protected, inherited]`

| Class name for this instance to be used as a lookup (must be initialised by subclasses). Definition at line 164 of file OgreStringInterface.h.

ParticleSystem* Ogre::ParticleAffector::mParent`[protected]`

| Definition at line 74 of file OgreParticleAffector.h.

ParamDictionaryMap Ogre::StringInterface::msDictionary`[static, protected, inherited]`

| Dictionary of parameters. Definition at line 161 of file OgreStringInterface.h.

String Ogre::ParticleAffector::mType`[protected]`

| Name of the type of affector, MUST be initialised by subclasses. Definition at line 62 of file OgreParticleAffector.h.

The documentation for this class was generated from the following file:

- OgreParticleAffector.h

Copyright © 2000-2005 by The OGRE Team
This work is licensed under a Creative Commons Attribution-ShareAlike 2.5 License.
Last modified Sun Sep 30 10:52:05 2007