class TimedAction:
	
	def __init__(self, start_t, duration_t, nodes, program):
		
		self.program = program
		self.program.actions.append(self)
		
		if not isinstance(nodes, list):
			nodes = [nodes]
			
		self.nodes = nodes # list of nodes
		self.start_t = start_t
		self.duration_t = duration_t
		self.end_t = start_t + duration_t
		
	def tick(self, t):
		
		if t >= self.start_t and t <= self.end_t:
			
			for node in self.nodes:
				
				if t == self.start_t:
					self.start(node)
					
				elif t == self.end_t:
					self.end(node)
					
				else:
					self.progress((t - self.start_t) / float(self.duration_t), node)
	
	# REIMPLEMENT
	
	def start(self, node):
		
		pass
		
	def end(self, node):
		
		pass
		
	def progress(self, prc, node):
		
		pass