axmol/cocos2dx/include/CCParticleSystem.h

/****************************************************************************
Copyright (c) 2010-2011 cocos2d-x.org
Copyright (c) 2008-2010 Ricardo Quesada
Copyright (c) 2011      Zynga Inc.

http://www.cocos2d-x.org

Permission is hereby granted, free of charge, to any person obtaining a copy
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****************************************************************************/
#ifndef __CCPARTICLE_SYSTEM_H__
#define __CCPARTICLE_SYSTEM_H__

#include "CCProtocols.h"
#include "CCNode.h"
#include "CCMutableDictionary.h"
#include "CCString.h"

namespace cocos2d {

class CCParticleBatchNode;

//* @enum
enum {
	/** The Particle emitter lives forever */
	kCCParticleDurationInfinity = -1,

	/** The starting size of the particle is equal to the ending size */
	kCCParticleStartSizeEqualToEndSize = -1,

	/** The starting radius of the particle is equal to the ending radius */
	kCCParticleStartRadiusEqualToEndRadius = -1,

	// backward compatible
	kParticleStartSizeEqualToEndSize = kCCParticleStartSizeEqualToEndSize,
	kParticleDurationInfinity = kCCParticleDurationInfinity,
};

//* @enum
enum {
	/** Gravity mode (A mode) */
	kCCParticleModeGravity,

	/** Radius mode (B mode) */
	kCCParticleModeRadius,	
};


/** @typedef tCCPositionType
possible types of particle positions
*/
typedef enum {
    /** Living particles are attached to the world and are unaffected by emitter repositioning. */
	kCCPositionTypeFree,

    /** Living particles are attached to the world but will follow the emitter repositioning.
    Use case: Attach an emitter to an sprite, and you want that the emitter follows the sprite.
    */
    kCCPositionTypeRelative,

    /** Living particles are attached to the emitter and are translated along with it. */
	kCCPositionTypeGrouped,
}tCCPositionType;

// backward compatible
enum {
	kPositionTypeFree = kCCPositionTypeFree,
	kPositionTypeGrouped = kCCPositionTypeGrouped,
}; 

/**
Structure that contains the values of each particle
*/
typedef struct sCCParticle {
	CCPoint     pos;
	CCPoint     startPos;

	ccColor4F	color;
	ccColor4F	deltaColor;

	float		size;
	float		deltaSize;

	float		rotation;
	float		deltaRotation;

	ccTime		timeToLive;

	unsigned int	atlasIndex;

	//! Mode A: gravity, direction, radial accel, tangential accel
	struct {
		CCPoint		dir;
		float		radialAccel;
		float		tangentialAccel;
	} modeA;

	//! Mode B: radius mode
	struct {
		float		angle;
		float		degreesPerSecond;
		float		radius;
		float		deltaRadius;
	} modeB;

}tCCParticle;

//typedef void (*CC_UPDATE_PARTICLE_IMP)(id, SEL, tCCParticle*, CCPoint);

class CCTexture2D;

/** @brief Particle System base class.
Attributes of a Particle System:
- emmision rate of the particles
- Gravity Mode (Mode A):
- gravity
- direction
- speed +-  variance
- tangential acceleration +- variance
- radial acceleration +- variance
- Radius Mode (Mode B):
- startRadius +- variance
- endRadius +- variance
- rotate +- variance
- Properties common to all modes:
- life +- life variance
- start spin +- variance
- end spin +- variance
- start size +- variance
- end size +- variance
- start color +- variance
- end color +- variance
- life +- variance
- blending function
- texture

cocos2d also supports particles generated by Particle Designer (http://particledesigner.71squared.com/).
'Radius Mode' in Particle Designer uses a fixed emit rate of 30 hz. Since that can't be guarateed in cocos2d,
cocos2d uses a another approach, but the results are almost identical. 

cocos2d supports all the variables used by Particle Designer plus a bit more:
- spinning particles (supported when using CCParticleSystemQuad)
- tangential acceleration (Gravity mode)
- radial acceleration (Gravity mode)
- radius direction (Radius mode) (Particle Designer supports outwards to inwards direction only)

It is possible to customize any of the above mentioned properties in runtime. Example:

@code
emitter.radialAccel = 15;
emitter.startSpin = 0;
@endcode

*/
class CC_DLL CCParticleSystem : public CCNode, public CCTextureProtocol
{	
protected:
	std::string m_sPlistFile;
	//! time elapsed since the start of the system (in seconds)
	float m_fElapsed;

	// Different modes
	//! Mode A:Gravity + Tangential Accel + Radial Accel
	struct {
		/** Gravity value. Only available in 'Gravity' mode. */
		CCPoint gravity;
		/** speed of each particle. Only available in 'Gravity' mode.  */
		float speed;
		/** speed variance of each particle. Only available in 'Gravity' mode. */
		float speedVar;
		/** tangential acceleration of each particle. Only available in 'Gravity' mode. */
		float tangentialAccel;
		/** tangential acceleration variance of each particle. Only available in 'Gravity' mode. */
		float tangentialAccelVar;
		/** radial acceleration of each particle. Only available in 'Gravity' mode. */
		float radialAccel;
		/** radial acceleration variance of each particle. Only available in 'Gravity' mode. */
		float radialAccelVar;
	} modeA;

	//! Mode B: circular movement (gravity, radial accel and tangential accel don't are not used in this mode)
	struct {
		/** The starting radius of the particles. Only available in 'Radius' mode. */
		float startRadius;
		/** The starting radius variance of the particles. Only available in 'Radius' mode. */
		float startRadiusVar;
		/** The ending radius of the particles. Only available in 'Radius' mode. */
		float endRadius;
		/** The ending radius variance of the particles. Only available in 'Radius' mode. */
		float endRadiusVar;			
		/** Number of degress to rotate a particle around the source pos per second. Only available in 'Radius' mode. */
		float rotatePerSecond;
		/** Variance in degrees for rotatePerSecond. Only available in 'Radius' mode. */
		float rotatePerSecondVar;
	} modeB;

	//! Array of particles
	tCCParticle *m_pParticles;

	// color modulate
	//	BOOL colorModulate;

	//! How many particles can be emitted per second
	float m_fEmitCounter;

	//!  particle idx
	unsigned int m_uParticleIdx;

	// Optimization
	//CC_UPDATE_PARTICLE_IMP	updateParticleImp;
	//SEL						updateParticleSel;

	/** weak reference to the CCSpriteBatchNode that renders the CCSprite */
	CC_PROPERTY(CCParticleBatchNode*, m_pBatchNode, BatchNode);

	// index of system in batch node array
	CC_SYNTHESIZE(unsigned int, m_uAtlasIndex, AtlasIndex);

	//true if scaled or rotated
	bool m_bTransformSystemDirty;
	// Number of allocated particles
	unsigned int m_uAllocatedParticles;

	/** Is the emitter active */
	CC_PROPERTY_READONLY(bool, m_bIsActive, IsActive)
	/** Quantity of particles that are being simulated at the moment */
	CC_PROPERTY_READONLY(unsigned int, m_uParticleCount, ParticleCount)
	/** How many seconds the emitter wil run. -1 means 'forever' */
	CC_PROPERTY(float, m_fDuration, Duration)
	/** sourcePosition of the emitter */
	CC_PROPERTY_PASS_BY_REF(CCPoint, m_tSourcePosition, SourcePosition)
	/** Position variance of the emitter */
	CC_PROPERTY_PASS_BY_REF(CCPoint, m_tPosVar, PosVar)
	/** life, and life variation of each particle */
	CC_PROPERTY(float, m_fLife, Life)
	/** life variance of each particle */
	CC_PROPERTY(float, m_fLifeVar, LifeVar)
	/** angle and angle variation of each particle */
	CC_PROPERTY(float, m_fAngle, Angle)
	/** angle variance of each particle */
	CC_PROPERTY(float, m_fAngleVar, AngleVar)

//////////////////////////////////////////////////////////////////////////
public:
	// mode A
	virtual const CCPoint& getGravity();
	virtual void setGravity(const CCPoint& g);
	virtual float getSpeed();
	virtual void setSpeed(float speed);
	virtual float getSpeedVar();
	virtual void setSpeedVar(float speed);
	virtual float getTangentialAccel();
	virtual void setTangentialAccel(float t);
	virtual float getTangentialAccelVar();
	virtual void setTangentialAccelVar(float t);
	virtual float getRadialAccel();
	virtual void setRadialAccel(float t);
	virtual float getRadialAccelVar();
	virtual void setRadialAccelVar(float t);
	// mode B
	virtual float getStartRadius();
	virtual void setStartRadius(float startRadius);
	virtual float getStartRadiusVar();
	virtual void setStartRadiusVar(float startRadiusVar);
	virtual float getEndRadius();
	virtual void setEndRadius(float endRadius);
	virtual float getEndRadiusVar();
	virtual void setEndRadiusVar(float endRadiusVar);
	virtual float getRotatePerSecond();
	virtual void setRotatePerSecond(float degrees);
	virtual float getRotatePerSecondVar();
	virtual void setRotatePerSecondVar(float degrees);

	void setZOrder(int z);
	virtual void setScale(float s);
	virtual void setRotation(float newRotation);
	virtual void setScaleX(float newScaleX);
	virtual void setScaleY(float newScaleY);
//////////////////////////////////////////////////////////////////////////
	
	/** start size in pixels of each particle */
	CC_PROPERTY(float, m_fStartSize, StartSize)
	/** size variance in pixels of each particle */
	CC_PROPERTY(float, m_fStartSizeVar, StartSizeVar)
	/** end size in pixels of each particle */
	CC_PROPERTY(float, m_fEndSize, EndSize)
	/** end size variance in pixels of each particle */
	CC_PROPERTY(float, m_fEndSizeVar, EndSizeVar)
	/** start color of each particle */
	CC_PROPERTY_PASS_BY_REF(ccColor4F, m_tStartColor, StartColor)
	/** start color variance of each particle */
	CC_PROPERTY_PASS_BY_REF(ccColor4F, m_tStartColorVar, StartColorVar)
	/** end color and end color variation of each particle */
	CC_PROPERTY_PASS_BY_REF(ccColor4F, m_tEndColor, EndColor)
	/** end color variance of each particle */
	CC_PROPERTY_PASS_BY_REF(ccColor4F, m_tEndColorVar, EndColorVar)
	//* initial angle of each particle
	CC_PROPERTY(float, m_fStartSpin, StartSpin)
	//* initial angle of each particle
	CC_PROPERTY(float, m_fStartSpinVar, StartSpinVar)
	//* initial angle of each particle
	CC_PROPERTY(float, m_fEndSpin, EndSpin)
	//* initial angle of each particle
	CC_PROPERTY(float, m_fEndSpinVar, EndSpinVar)
	/** emission rate of the particles */
	CC_PROPERTY(float, m_fEmissionRate, EmissionRate)
	/** maximum particles of the system */
	CC_PROPERTY(unsigned int, m_uTotalParticles, TotalParticles)
	/** conforms to CocosNodeTexture protocol */
	CC_PROPERTY(CCTexture2D*, m_pTexture, Texture)
	/** conforms to CocosNodeTexture protocol */
	CC_PROPERTY(ccBlendFunc, m_tBlendFunc, BlendFunc)
	/** whether or not the particles are using blend additive.
	If enabled, the following blending function will be used.
	@code
	source blend function = GL_SRC_ALPHA;
	dest blend function = GL_ONE;
	@endcode
	*/
	CC_PROPERTY(bool, m_bIsBlendAdditive, IsBlendAdditive)
	/** particles movement type: Free or Grouped
	@since v0.8
	*/
	CC_PROPERTY(tCCPositionType, m_ePositionType, PositionType)
	/** whether or not the node will be auto-removed when it has no particles left.
	By default it is false.
	@since v0.8
	*/
	CC_PROPERTY(bool, m_bIsAutoRemoveOnFinish, IsAutoRemoveOnFinish)
	/** Switch between different kind of emitter modes:
	- kCCParticleModeGravity: uses gravity, speed, radial and tangential acceleration
	- kCCParticleModeRadius: uses radius movement + rotation
	*/
	CC_PROPERTY(int, m_nEmitterMode, EmitterMode)

public:
	CCParticleSystem();
	virtual ~CCParticleSystem();
	/** creates an initializes a CCParticleSystem from a plist file.
	This plist files can be creted manually or with Particle Designer:
	http://particledesigner.71squared.com/
	@since v0.99.3
	*/
	static CCParticleSystem * particleWithFile(const char *plistFile);

	/** initializes a CCParticleSystem*/
	bool init();
	/** initializes a CCParticleSystem from a plist file.
	This plist files can be creted manually or with Particle Designer:
	http://particledesigner.71squared.com/
	@since v0.99.3
	*/
	bool initWithFile(const char *plistFile);

	/** initializes a CCQuadParticleSystem from a CCDictionary.
	@since v0.99.3
	*/
	bool initWithDictionary(CCDictionary<std::string, CCObject*> *dictionary);

	//! Initializes a system with a fixed number of particles
	virtual bool initWithTotalParticles(unsigned int numberOfParticles);
	//! Add a particle to the emitter
	bool addParticle();
	//! Initializes a particle
	void initParticle(tCCParticle* particle);
	//! stop emitting particles. Running particles will continue to run until they die
	void stopSystem();
	//! Kill all living particles.
	void resetSystem();
	//! whether or not the system is full
	bool isFull();

	//! should be overriden by subclasses
	virtual void updateQuadWithParticle(tCCParticle* particle, const CCPoint& newPosition);
	//! should be overriden by subclasses
	virtual void postStep();

	virtual void update(ccTime dt);
	virtual void updateWithNoTime(void);
private:
	/** Private method, return the string found by key in dict.
	@return "" if not found; return the string if found.
	*/
	inline const char * valueForKey(const char *key, CCDictionary<std::string, CCObject*> *dict)
	{
		if (dict)
		{
			CCString *pString = (CCString*)dict->objectForKey(std::string(key));
			return pString ? pString->m_sString.c_str() : "";
		}
		return "";
	}
};

}// namespace cocos2d

#endif //__CCPARTICLE_SYSTEM_H__