def make_interval_emitter(
pos: Vec2d,
filenames_and_textures: List[
str], # Also supports Texture objects in the List
emit_interval: float,
emit_duration: float,
particle_speed: float,
particle_lifetime_min: float,
particle_lifetime_max: float,
particle_scale: float = 1.0,
fade_particles: bool = True):
"""Returns an emitter that emits its particles at a constant rate for a given amount of time"""
particle_factory = arcade.LifetimeParticle
if fade_particles:
particle_factory = arcade.FadeParticle
return arcade.Emitter(
pos=pos,
emit_controller=arcade.EmitterIntervalWithTime(emit_interval,
emit_duration),
particle_factory=lambda emitter: particle_factory(
filename_or_texture=random.choice(filenames_and_textures),
vel=arcade.rand_on_circle(Vec2d.zero(), particle_speed),
lifetime=random.uniform(particle_lifetime_min,
particle_lifetime_max),
scale=particle_scale))
def explode_ringed_firework(self, prev_emitter):
"""Actions that happen when a firework shell explodes, resulting in a ringed firework"""
self.emitters.append(make_puff(prev_emitter))
self.emitters.append(make_flash(prev_emitter))
spark_texture, ring_texture = random.choice(SPARK_PAIRS)
sparks = arcade.Emitter(
center_xy=prev_emitter.get_pos(),
emit_controller=arcade.EmitBurst(25),
particle_factory=lambda emitter: arcade.FadeParticle(
filename_or_texture=spark_texture,
change_xy=arcade.rand_in_circle((0.0, 0.0), 8.0),
lifetime=random.uniform(0.55, 0.8),
mutation_callback=firework_spark_mutator))
self.emitters.append(sparks)
ring = arcade.Emitter(
center_xy=prev_emitter.get_pos(),
emit_controller=arcade.EmitBurst(20),
particle_factory=lambda emitter: arcade.FadeParticle(
filename_or_texture=ring_texture,
change_xy=arcade.rand_on_circle(
(0.0, 0.0), 5.0) + arcade.rand_in_circle((0.0, 0.0), 0.25),
lifetime=random.uniform(1.0, 1.6),
mutation_callback=firework_spark_mutator))
self.emitters.append(ring)
def emitter_27():
"""Maintain a steady count of particles"""
e = arcade.Emitter(
pos=CENTER_POS,
emit_controller=arcade.EmitMaintainCount(3),
particle_factory=lambda emitter: arcade.LifetimeParticle(
filename_or_texture=TEXTURE,
vel=arcade.rand_on_circle(Vec2d.zero(), 2.0),
lifetime=random.uniform(1.0, 3.0),
))
return emitter_27.__doc__, e
def emitter_7():
"""Burst, emit from center, velocity fixed speed around 360 degrees"""
e = arcade.Emitter(
pos=CENTER_POS,
emit_controller=arcade.EmitBurst(BURST_PARTICLE_COUNT // 4),
particle_factory=lambda emitter: arcade.LifetimeParticle(
filename_or_texture=TEXTURE,
vel=arcade.rand_on_circle(Vec2d.zero(), PARTICLE_SPEED_FAST),
lifetime=DEFAULT_PARTICLE_LIFETIME,
scale=DEFAULT_SCALE,
alpha=DEFAULT_ALPHA))
return emitter_7.__doc__, e
def emitter_20():
"""Interval, emit from center, velocity fixed speed around 360 degrees"""
e = arcade.Emitter(
pos=CENTER_POS,
emit_controller=arcade.EmitterIntervalWithTime(DEFAULT_EMIT_INTERVAL,
DEFAULT_EMIT_DURATION),
particle_factory=lambda emitter: arcade.LifetimeParticle(
filename_or_texture=TEXTURE,
vel=arcade.rand_on_circle(Vec2d.zero(), PARTICLE_SPEED_FAST),
lifetime=DEFAULT_PARTICLE_LIFETIME,
scale=DEFAULT_SCALE,
alpha=DEFAULT_ALPHA))
return emitter_20.__doc__, e
def emitter_4():
"""Burst, emit on circle"""
e = arcade.Emitter(
pos=CENTER_POS,
emit_controller=arcade.EmitBurst(BURST_PARTICLE_COUNT),
particle_factory=lambda emitter: arcade.LifetimeParticle(
filename_or_texture=TEXTURE,
vel=arcade.rand_in_circle(Vec2d.zero(), PARTICLE_SPEED_SLOW),
lifetime=DEFAULT_PARTICLE_LIFETIME,
pos=arcade.rand_on_circle(Vec2d.zero(), 100),
scale=DEFAULT_SCALE,
alpha=DEFAULT_ALPHA))
return emitter_4.__doc__, e
def emitter_17():
"""Interval, emit on circle"""
e = arcade.Emitter(
pos=CENTER_POS,
emit_controller=arcade.EmitterIntervalWithTime(DEFAULT_EMIT_INTERVAL,
DEFAULT_EMIT_DURATION),
particle_factory=lambda emitter: arcade.LifetimeParticle(
filename_or_texture=TEXTURE,
vel=arcade.rand_in_circle(Vec2d.zero(), PARTICLE_SPEED_SLOW),
lifetime=DEFAULT_PARTICLE_LIFETIME,
pos=arcade.rand_on_circle(Vec2d.zero(), 100),
scale=DEFAULT_SCALE,
alpha=DEFAULT_ALPHA))
return emitter_17.__doc__, e
def _createWarpEffectEmitter(self) -> Emitter:
"""
Random particle textures
"""
texture0 = self._warpEffectTextures[0]
texture2 = self._warpEffectTextures[2]
e: Emitter = Emitter(
center_xy=self._centerPosition,
emit_controller=EmitterIntervalWithTime(DEFAULT_EMIT_INTERVAL, DEFAULT_EMIT_DURATION),
particle_factory=lambda emitter: LifetimeParticle(
filename_or_texture=randomChoice((texture0, texture2)),
change_xy=rand_on_circle((0.0, 0.0), PARTICLE_SPEED_FAST),
lifetime=DEFAULT_PARTICLE_LIFETIME,
scale=DEFAULT_SCALE
)
)
return e
def __init__(self, center_pos, velocity=None):
self.emitter_timeout = 0
if velocity:
self.speed = PARTICLE_SPEED_FAST + velocity.speed
else:
self.speed = PARTICLE_SPEED_FAST
self.frametime_plotter = FrametimePlotter()
self.emitter = arcade.Emitter(
center_xy=center_pos,
emit_controller=arcade.EmitBurst(BURST_PARTICLE_COUNT),
# emit_controller=arcade.EmitterIntervalWithTime(DEFAULT_EMIT_INTERVAL, DEFAULT_EMIT_DURATION),
particle_factory=lambda emitter: arcade.LifetimeParticle(
filename_or_texture=TEXTURE,
change_xy=arcade.rand_on_circle((0.0, 0.0), self.speed),
lifetime=random.uniform(DEFAULT_PARTICLE_LIFETIME - 0.5, DEFAULT_PARTICLE_LIFETIME),
#lifetime=DEFAULT_PARTICLE_LIFETIME,
scale=DEFAULT_SCALE,
alpha=DEFAULT_ALPHA
)
)
def make_interval_emitter(center_xy: Point,
filenames_and_textures: List[FilenameOrTexture],
emit_interval: float,
emit_duration: float,
particle_speed: float,
particle_lifetime_min: float,
particle_lifetime_max: float,
particle_scale: float = 1.0,
fade_particles: bool = True):
"""Returns an emitter that emits its particles at a constant rate for a given amount of time"""
particle_factory = arcade.LifetimeParticle
if fade_particles:
particle_factory = arcade.FadeParticle
return arcade.Emitter(
center_xy=center_xy,
emit_controller=arcade.EmitterIntervalWithTime(emit_interval,
emit_duration),
particle_factory=lambda emitter: particle_factory(
filename_or_texture=random.choice(filenames_and_textures),
change_xy=arcade.rand_on_circle((0.0, 0.0), particle_speed),
lifetime=random.uniform(particle_lifetime_min,
particle_lifetime_max),
scale=particle_scale))
def test_rand_on_circle():
"""Smoke test"""
arcade.rand_on_circle((10.0, 20.0), 15.5)
