Exemple #1
0
	def _emit_tail(self, system):
		# create initial direction with random vector length and angle
		velocity = th.PolarVector2(th.random(30, 70), th.random(0, 360))

		# create particle at position of explosion, with emitter-specific color
		# and at 80% initial scale
		particle = th.Particle(TAIL_DURATION)
		particle.position = self._position
		particle.color = self._color
		particle.scale = particle.scale * 0.8

		# a tail contains 25 particles with different speeds and scales
		# the largest particles move fastest, leading to a comet-like tail effect
		for i in range(25):
			# decrease scale continuously
			particle.scale *= 0.95

			# decrease speed continuously
			velocity.r = velocity.r * 0.96

			#particle.velocity = velocity
			particle.velocity = velocity.to_vector2()

			# add adapted particle to particle system
			system.add_particle(particle)
Exemple #2
0
	def __init__(self, position):
		th.Emitter.__init__(self)

		self._accumulated_time = copy(sf.Time.ZERO)
		self._position = copy(position)
		self._color = copy(firework_colors[int(th.random(0, len(firework_colors)-1))])