"""
Contains the ParticleInterval class
"""
__all__ = ['ParticleInterval']
from panda3d.core import *
from panda3d.direct import *
from direct.directnotify.DirectNotifyGlobal import directNotify
from .Interval import Interval
[docs]class ParticleInterval(Interval):
"""
Use this interval when you want to have greater control over a
ParticleEffect. The interval does not register the effect with
the global particle and physics managers, but it does call upon
them to perform its stepping. You should NOT call
particleEffect.start() with an effect that is being controlled
by a ParticleInterval.
"""
# Name counter
particleNum = 1
# create ParticleInterval DirectNotify category
notify = directNotify.newCategory('ParticleInterval')
# Class methods
[docs] def __init__(self,
particleEffect,
parent,
worldRelative = 1,
renderParent = None,
duration = 0.0,
softStopT = 0.0,
cleanup = False,
name = None):
"""
Args:
particleEffect (ParticleEffect): a particle effect
parent (NodePath): this is where the effect will be parented in the
scene graph
worldRelative (bool): this will override 'renderParent' with render
renderParent (NodePath): this is where the particles will be
rendered in the scenegraph
duration (float): for the time
softStopT (float): no effect if 0.0, a positive value will count
from the start of the interval, a negative value will count
from the end of the interval
cleanup (boolean): if True the effect will be destroyed and removed
from the scenegraph upon interval completion. Set to False if
planning on reusing the interval.
name (string): use this for unique intervals so that they can be
easily found in the taskMgr.
"""
# Generate unique name
id = 'Particle-%d' % ParticleInterval.particleNum
ParticleInterval.particleNum += 1
if name is None:
name = id
# Record instance variables
self.particleEffect = particleEffect
self.cleanup = cleanup
if parent is not None:
self.particleEffect.reparentTo(parent)
if worldRelative:
renderParent = render
if renderParent:
for particles in self.particleEffect.getParticlesList():
particles.setRenderParent(renderParent.node())
self.__softStopped = False
if softStopT == 0.0:
self.softStopT = duration
elif softStopT < 0.0:
self.softStopT = duration+softStopT
else:
self.softStopT = softStopT
# Initialize superclass
Interval.__init__(self, name, duration)
def __step(self,dt):
if self.particleEffect:
self.particleEffect.accelerate(dt,1,0.05)
def __softStart(self):
if self.particleEffect:
self.particleEffect.softStart()
self.__softStopped = False
def __softStop(self):
if self.particleEffect:
self.particleEffect.softStop()
self.__softStopped = True
[docs] def privInitialize(self, t):
if self.state != CInterval.SPaused:
# Restarting from a hard stop or just interrupting the
# current play
self.__softStart()
if self.particleEffect:
self.particleEffect.clearToInitial()
self.currT = 0
if self.particleEffect:
for forceGroup in self.particleEffect.getForceGroupList():
forceGroup.enable()
Interval.privInitialize(self,t)
[docs] def privInstant(self):
self.privInitialize(self.getDuration())
self.privFinalize()
[docs] def privStep(self, t):
if self.state == CInterval.SPaused or t < self.currT:
# Restarting from a pause.
self.privInitialize(t)
else:
if not self.__softStopped and t > self.softStopT:
self.__step(self.softStopT-self.currT)
self.__softStop()
self.__step(t-self.softStopT)
else:
self.__step(t-self.currT)
Interval.privStep(self,t)
[docs] def privFinalize(self):
Interval.privFinalize(self)
if self.cleanup and self.particleEffect:
self.particleEffect.cleanup()
self.particleEffect = None
