print('importing numpy')

import numpy as np

print('imported numpy')

print('importing matplotlib')

import matplotlib

print('imported matplotlib')

print('importing pyplot')

from matplotlib import pyplot as plt

print('imported pyplot')

fig, ax = plt.subplots()

print('created fig and ax')

ax.plot(np.random.random(50))

print('plotted something')

ax.set_xlabel('test label')

print('set a label')

fig.set_size_inches((5, 4))

fig.savefig('test.png')

print('saved fig')

from kivy.app import App

from kivy.base import runTouchApp

from kivy.uix.image import Image

from kivy.lang import Builder

class MatplotlibApp(App):

def build(self):

root = Builder.load_string("""

BoxLayout:

orientation: 'vertical'

Image:

id: the_image

source: 'test.png'

allow_stretch: True

Button:

size_hint_y: None

height: dp(40)

text: 'new plot'

on_release: app.generate_new_plot()

""")

return root

def generate_new_plot(self):

fig, ax = plt.subplots()

ax.set_xlabel('test xlabel')

ax.set_ylabel('test ylabel')

ax.plot(np.random.random(50))

ax.plot(np.sin(np.linspace(0, 3*np.pi, 30)))

ax.legend(['random numbers', 'sin'])

fig.set_size_inches((5, 4))

fig.tight_layout()

fig.savefig('test.png', dpi=150)

self.root.ids.the_image.reload()

MatplotlibApp().run()

runTouchApp(Image(source='test.png', allow_stretch=True))