A Simple Model

Models are used to do the ‘hard sums’ within the GUI. It is possible to have multiple models within a single presenter, as we will see with this example. For this example we have kept the models fairly simple, in reality they will be much more complex.

The first model generates the data for the user:

import numpy as np

class DataGenerator(object):

    def __init__(self):
        self.x_data = np.linspace(0.0, 10.0, 100)
        self.y_data = []

    def genData(self, freq, phi):
        self.y_data = np.sin(freq * self.x_data + phi)

    def getXData(self):
        return self.x_data

    def getYData(self):
        return self.y_data

The model methods can be split into three types initialisation, a calculate button and get methods.

In this case we have a distinct second method. Usually this will be placed into its own file, however for simplicity we will contain it within the same file as the above code.