ParticleSystem Class

Extends _RendererUnderSG

Module: cc

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 ParticleSystem)
  
• 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:
  

Index

Properties

• preview Boolean Play particle in edit mode.
• custom Boolean If set custom to true, then use custom properties insteadof read particle file.
• file string The plist file.
• texture Texture2D .
• particleCount Number Current quantity of particles that are being simulated.
• srcBlendFactor BlendFactor Specify the source Blend Factor.
• dstBlendFactor BlendFactor Specify the destination Blend Factor.
• playOnLoad Boolean If set to true, the particle system will automatically start playing on onLoad.
• autoRemoveOnFinish Boolean Indicate whether the owner node will be auto-removed when it has no particles left.
• active Boolean Indicate whether the particle system is activated.
• totalParticles Number Maximum particles of the system.
• duration Number How many seconds the emitter wil run.
• emissionRate Number Emission rate of the particles.
• life Number Life of each particle setter.
• lifeVar Number Variation of life.
• startColor Color Start color of each particle.
• startColorVar Color Variation of the start color.
• endColor Color Ending color of each particle.
• endColorVar Color Variation of the end color.
• angle Number Angle of each particle setter.
• angleVar Number Variation of angle of each particle setter.
• startSize Number Start size in pixels of each particle.
• startSizeVar Number Variation of start size in pixels.
• endSize Number End size in pixels of each particle.
• endSizeVar Number Variation of end size in pixels.
• startSpin Number Start angle of each particle.
• startSpinVar Number Variation of start angle.
• endSpin Number End angle of each particle.
• endSpinVar Number Variation of end angle.
• sourcePos Vec2 Source position of the emitter.
• posVar Vec2 Variation of source position.
• positionType ParticleSystem.PositionType Particles movement type.
• emitterMode ParticleSystem.EmitterMode Particles emitter modes.
• gravity Vec2 Gravity of the emitter.
• speed Number Speed of the emitter.
• speedVar Number Variation of the speed.
• tangentialAccel Number Tangential acceleration of each particle.
• tangentialAccelVar Number Variation of the tangential acceleration.
• radialAccel Number Acceleration of each particle.
• radialAccelVar Number Variation of the radial acceleration.
• rotationIsDir Boolean Indicate whether the rotation of each particle equals to its direction.
• startRadius Number Starting radius of the particles.
• startRadiusVar Number Variation of the starting radius.
• endRadius Number Ending radius of the particles.
• endRadiusVar Number Variation of the ending radius.
• rotatePerS Number Number of degress to rotate a particle around the source pos per second.
• rotatePerSVar Number Variation of the degress to rotate a particle around the source pos per second.
• DURATION_INFINITY Number The Particle emitter lives forever.
• START_SIZE_EQUAL_TO_END_SIZE Number The starting size of the particle is equal to the ending size.
• START_RADIUS_EQUAL_TO_END_RADIUS Number The starting radius of the particle is equal to the ending radius.
• _sgNode _ccsg.Node Reference to the instance of _ccsg.Node
• __eventTargets Array Register all related EventTargets,...
• node Node The node this component is attached to.
• uuid String The uuid for editor.
• _enabled Boolean
• enabled Boolean indicates whether this component is enabled or not.
• enabledInHierarchy Boolean indicates whether this component is enabled and its node is also active in the hierarchy.
• _isOnLoadCalled Number Returns a value which used to indicate the onLoad get called or not.
• _name String
• _objFlags Number
• name String The name of the object.
• isValid Boolean Indicates whether the object is not yet destroyed.

Methods

• addParticle Add a particle to the emitter.
• stopSystem Stop emitting particles.
• resetSystem Kill all living particles.
• isFull Whether or not the system is full.
• setDisplayFrame WARNING: this method is experimental.
• setTextureWithRect Sets a new texture with a rect.
• _createSgNode Create and returns your new scene graph node (SGNode) to add to scene graph.
• _initSgNode
• _removeSgNode
• update Update is called every frame, if the Component is enabled.
• lateUpdate LateUpdate is called every frame, if the Component is enabled.
• __preload __preload is called before every onLoad.
• onLoad When attaching to an active node or its node first activated.
• start Called before all scripts' update if the Component is enabled the first time.
• onEnable Called when this component becomes enabled and its node is active.
• onDisable Called when this component becomes disabled or its node becomes inactive.
• onDestroy Called when this component will be destroyed.
• onFocusInEditor
• onLostFocusInEditor
• resetInEditor Called to initialize the component or node’s properties when adding the component the first time or when the Reset command is used.
• addComponent Adds a component class to the node.
• getComponent Returns the component of supplied type if the node has one attached, null if it doesn't....
• getComponents Returns all components of supplied Type in the node.
• getComponentInChildren Returns the component of supplied type in any of its children using depth first search.
• getComponentsInChildren Returns the components of supplied type in self or any of its children using depth first search.
• _getLocalBounds If the component's bounding box is different from the node's, you can implement this method to supply
• onRestore for undo/redo operation.
• schedule Schedules a custom selector....
• scheduleOnce Schedules a callback function that runs only once, with a delay of 0 or larger.
• unschedule Unschedules a custom callback function.
• unscheduleAllCallbacks unschedule all scheduled callback functions: custom callback functions, and the 'update' callback function....
• destroy Actual object destruction will delayed until before rendering.
• _destruct Clear all references in the instance.
• _onPreDestroy Called before the object being destroyed.
• _serialize The customized serialization for this object.
• _deserialize Init this object from the custom serialized data.

Details

Properties

preview

Play particle in edit mode.

custom

If set custom to true, then use custom properties insteadof read particle file.

file

The plist file.

texture

.

particleCount

Current quantity of particles that are being simulated.

srcBlendFactor

Specify the source Blend Factor.

dstBlendFactor

Specify the destination Blend Factor.

playOnLoad

If set to true, the particle system will automatically start playing on onLoad.

autoRemoveOnFinish

Indicate whether the owner node will be auto-removed when it has no particles left.

active

Indicate whether the particle system is activated.

totalParticles

Maximum particles of the system.

duration

How many seconds the emitter wil run. -1 means 'forever'.

emissionRate

Emission rate of the particles.

life

Life of each particle setter.

lifeVar

Variation of life.

startColor

Start color of each particle.

startColorVar

Variation of the start color.

endColor

Ending color of each particle.

endColorVar

Variation of the end color.

angle

Angle of each particle setter.

angleVar

Variation of angle of each particle setter.

startSize

Start size in pixels of each particle.

startSizeVar

Variation of start size in pixels.

endSize

End size in pixels of each particle.

endSizeVar

Variation of end size in pixels.

startSpin

Start angle of each particle.

startSpinVar

Variation of start angle.

endSpin

End angle of each particle.

endSpinVar

Variation of end angle.

sourcePos

Source position of the emitter.

posVar

Variation of source position.

positionType

Particles movement type.

emitterMode

Particles emitter modes.

gravity

Gravity of the emitter.

speed

Speed of the emitter.

speedVar

Variation of the speed.

tangentialAccel

Tangential acceleration of each particle. Only available in 'Gravity' mode.

tangentialAccelVar

Variation of the tangential acceleration.

radialAccel

Acceleration of each particle. Only available in 'Gravity' mode.

radialAccelVar

Variation of the radial acceleration.

rotationIsDir

Indicate whether the rotation of each particle equals to its direction. Only available in 'Gravity' mode.

startRadius

Starting radius of the particles. Only available in 'Radius' mode.

startRadiusVar

Variation of the starting radius.

endRadius

Ending radius of the particles. Only available in 'Radius' mode.

endRadiusVar

Variation of the ending radius.

rotatePerS

Number of degress to rotate a particle around the source pos per second. Only available in 'Radius' mode.

rotatePerSVar

Variation of the degress to rotate a particle around the source pos per second.

DURATION_INFINITY

The Particle emitter lives forever.

START_SIZE_EQUAL_TO_END_SIZE

The starting size of the particle is equal to the ending size.

START_RADIUS_EQUAL_TO_END_RADIUS

The starting radius of the particle is equal to the ending radius.

_sgNode

Reference to the instance of _ccsg.Node If it is possible to return null from your overloaded _createSgNode, then you should always check for null before using this property and reimplement __preload.

__eventTargets

Register all related EventTargets, all event callbacks will be removed in _onPreDestroy

node

The node this component is attached to. A component is always attached to a node.

Examples

cc.log(comp.node);

uuid

The uuid for editor.

Examples

cc.log(comp.uuid);

_enabled

enabled

indicates whether this component is enabled or not.

Examples

comp.enabled = true;
cc.log(comp.enabled);

enabledInHierarchy

indicates whether this component is enabled and its node is also active in the hierarchy.

Examples

cc.log(comp.enabledInHierarchy);

_isOnLoadCalled

Returns a value which used to indicate the onLoad get called or not.

Examples

cc.log(this._isOnLoadCalled > 0);

_name

_objFlags

name

The name of the object.

Examples

obj.name = "New Obj";

isValid

Indicates whether the object is not yet destroyed. (It will not be available after being destroyed)
When an object's destroy is called, it is actually destroyed after the end of this frame. So isValid will return false from the next frame, while isValid in the current frame will still be true. If you want to determine whether the current frame has called destroy, use cc.isValid(obj, true), but this is often caused by a particular logical requirements, which is not normally required.

Examples

var node = new cc.Node();
cc.log(node.isValid);    // true
node.destroy();
cc.log(node.isValid);    // true, still valid in this frame
// after a frame...
cc.log(node.isValid);    // false, destroyed in the end of last frame

Methods

addParticle

Add a particle to the emitter.

stopSystem

Stop emitting particles. Running particles will continue to run until they die.

Examples

// stop particle system.
myParticleSystem.stopSystem();

resetSystem

Kill all living particles.

Examples

// play particle system.
myParticleSystem.resetSystem();

isFull

Whether or not the system is full.

setDisplayFrame

Sets a new CCSpriteFrame as particle.
WARNING: this method is experimental. Use setTextureWithRect instead.

Parameters

• spriteFrame SpriteFrame

setTextureWithRect

Sets a new texture with a rect. The rect is in texture position and size.

Parameters

• texture Texture2D
• rect Rect

_createSgNode

Create and returns your new scene graph node (SGNode) to add to scene graph. You should call the setContentSize of the SGNode if its size should be the same with the node's.

_initSgNode

_removeSgNode

update

Update is called every frame, if the Component is enabled.

Parameters

• dt Number the delta time in seconds it took to complete the last frame

lateUpdate

LateUpdate is called every frame, if the Component is enabled.

__preload

__preload is called before every onLoad. It is used to initialize the builtin components internally, to avoid checking whether onLoad is called before every public method calls. This method should be removed if script priority is supported.

onLoad

When attaching to an active node or its node first activated. onLoad is always called before any start functions, this allows you to order initialization of scripts.

start

Called before all scripts' update if the Component is enabled the first time. Usually used to initialize some logic which need to be called after all components' onload methods called.

onEnable

Called when this component becomes enabled and its node is active.

onDisable

Called when this component becomes disabled or its node becomes inactive.

onDestroy

Called when this component will be destroyed.

onFocusInEditor

onLostFocusInEditor

resetInEditor

Called to initialize the component or node’s properties when adding the component the first time or when the Reset command is used. This function is only called in editor.

addComponent

Adds a component class to the node. You can also add component to node by passing in the name of the script.

Parameters

• typeOrClassName Function | String the constructor or the class name of the component to add

Examples

var sprite = node.addComponent(cc.Sprite);
var test = node.addComponent("Test");

getComponent

Returns the component of supplied type if the node has one attached, null if it doesn't.
You can also get component in the node by passing in the name of the script.

Parameters

• typeOrClassName Function | String

Examples

// get sprite component.
var sprite = node.getComponent(cc.Sprite);
// get custom test calss.
var test = node.getComponent("Test");

getComponents

Returns all components of supplied Type in the node.

Parameters

• typeOrClassName Function | String

Examples

var sprites = node.getComponents(cc.Sprite);
var tests = node.getComponents("Test");

getComponentInChildren

Returns the component of supplied type in any of its children using depth first search.

Parameters

• typeOrClassName Function | String

Examples

var sprite = node.getComponentInChildren(cc.Sprite);
var Test = node.getComponentInChildren("Test");

getComponentsInChildren

Returns the components of supplied type in self or any of its children using depth first search.

Parameters

• typeOrClassName Function | String

Examples

var sprites = node.getComponentsInChildren(cc.Sprite);
var tests = node.getComponentsInChildren("Test");

_getLocalBounds

If the component's bounding box is different from the node's, you can implement this method to supply a custom axis aligned bounding box (AABB), so the editor's scene view can perform hit test properly.

Parameters

• out_rect Rect the Rect to receive the bounding box

onRestore

onRestore is called after the user clicks the Reset item in the Inspector's context menu or performs an undo operation on this component.

If the component contains the "internal state", short for "temporary member variables which not included
in its CCClass properties", then you may need to implement this function.

The editor will call the getset accessors of your component to record/restore the component's state
for undo/redo operation. However, in extreme cases, it may not works well. Then you should implement
this function to manually synchronize your component's "internal states" with its public properties.
Once you implement this function, all the getset accessors of your component will not be called when
the user performs an undo/redo operation. Which means that only the properties with default value
will be recorded or restored by editor.

Similarly, the editor may failed to reset your component correctly in extreme cases. Then if you need
to support the reset menu, you should manually synchronize your component's "internal states" with its
properties in this function. Once you implement this function, all the getset accessors of your component
will not be called during reset operation. Which means that only the properties with default value
will be reset by editor.

This function is only called in editor mode.

schedule

Schedules a custom selector.
If the selector is already scheduled, then the interval parameter will be updated without scheduling it again.

Parameters

• callback function The callback function
• interval Number Tick interval in seconds. 0 means tick every frame.
• repeat Number The selector will be executed (repeat + 1) times, you can use cc.macro.REPEAT_FOREVER for tick infinitely.
• delay Number The amount of time that the first tick will wait before execution.

Examples

var timeCallback = function (dt) {
  cc.log("time: " + dt);
}
this.schedule(timeCallback, 1);

scheduleOnce

Schedules a callback function that runs only once, with a delay of 0 or larger.

Parameters

• callback function A function wrapped as a selector
• delay Number The amount of time that the first tick will wait before execution.

Examples

var timeCallback = function (dt) {
  cc.log("time: " + dt);
}
this.scheduleOnce(timeCallback, 2);

unschedule

Unschedules a custom callback function.

Parameters

• callback_fn function A function wrapped as a selector

Examples

this.unschedule(_callback);

unscheduleAllCallbacks

unschedule all scheduled callback functions: custom callback functions, and the 'update' callback function.
Actions are not affected by this method.

Examples

this.unscheduleAllCallbacks();

destroy

Destroy this Object, and release all its own references to other objects.
Actual object destruction will delayed until before rendering. From the next frame, this object is not usable any more. You can use cc.isValid(obj) to check whether the object is destroyed before accessing it.

Examples

obj.destroy();

_destruct

Clear all references in the instance.

NOTE: this method will not clear the getter or setter functions which defined in the instance of CCObject. You can override the _destruct method if you need, for example: _destruct: function () { for (var key in this) { if (this.hasOwnProperty(key)) { switch (typeof this[key]) { case 'string': this[key] = ''; break; case 'object': case 'function': this[key] = null; break; } } }

_onPreDestroy

Called before the object being destroyed.

_serialize

The customized serialization for this object. (Editor Only)

Parameters

• exporting Boolean

_deserialize

Init this object from the custom serialized data.

Parameters

• data Object the serialized json data
• ctx _Deserializer