| | """ |
| | ======= |
| | 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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