| """ |
| ======= |
| Buttons |
| ======= |
| |
| Constructing a simple button GUI to modify a sine wave. |
| |
| The ``next`` and ``previous`` button widget helps visualize the wave with |
| new frequencies. |
| """ |
|
|
| import matplotlib.pyplot as plt |
| import numpy as np |
|
|
| from matplotlib.widgets import Button |
|
|
| freqs = np.arange(2, 20, 3) |
|
|
| fig, ax = plt.subplots() |
| fig.subplots_adjust(bottom=0.2) |
| t = np.arange(0.0, 1.0, 0.001) |
| s = np.sin(2*np.pi*freqs[0]*t) |
| l, = ax.plot(t, s, lw=2) |
|
|
|
|
| class Index: |
| ind = 0 |
|
|
| def next(self, event): |
| self.ind += 1 |
| i = self.ind % len(freqs) |
| ydata = np.sin(2*np.pi*freqs[i]*t) |
| l.set_ydata(ydata) |
| plt.draw() |
|
|
| def prev(self, event): |
| self.ind -= 1 |
| i = self.ind % len(freqs) |
| ydata = np.sin(2*np.pi*freqs[i]*t) |
| l.set_ydata(ydata) |
| plt.draw() |
|
|
| callback = Index() |
| axprev = fig.add_axes([0.7, 0.05, 0.1, 0.075]) |
| axnext = fig.add_axes([0.81, 0.05, 0.1, 0.075]) |
| bnext = Button(axnext, 'Next') |
| bnext.on_clicked(callback.next) |
| bprev = Button(axprev, 'Previous') |
| bprev.on_clicked(callback.prev) |
|
|
| plt.show() |
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