class Trace:
    def __init__(self, descrStr):
        self.descr = descrStr
        self.values = None
        self.label = None
        self.unit = None
        self.attributes = {}

    def plot(self):
        import matplotlib.pyplot as plt
        plt.plot(self.values, label=self.descr)
        plt.legend()
        

class TraceXY:
    def __init__(self, descrStr):
        self.descr = descrStr
        self.x = Trace('x_values')
        self.y = Trace('y_values')

    def plot(self):
        import matplotlib.pyplot as plt
        plt.plot(self.x.values, self.y.values, label=self.descr)
        plt.legend()
        plt.xlabel(self.x.label)
        
class TraceSetSameX:
    def __init__(self, descrStr):
        self.descr = descrStr
        self.x = Trace('x_values')
        self.traces={}

    def addTrace(self, tr):
        if len(self.traces) == 0:
            self.x = tr.x
        trY = tr.y
        self.traces[tr.descr]=trY
        
    def plot(self):
        import matplotlib.pyplot as plt
        for k, tr in self.traces.items():
            tr.plot()
        plt.xlabel(self.x.label)
        plt.legend()