.. _sphx_glr_gallery_widgets_span_selector.py: ============= Span Selector ============= The SpanSelector is a mouse widget to select a xmin/xmax range and plot the detail view of the selected region in the lower axes .. image:: /gallery/widgets/images/sphx_glr_span_selector_001.png :align: center .. code-block:: python import numpy as np import matplotlib.pyplot as plt from matplotlib.widgets import SpanSelector # Fixing random state for reproducibility np.random.seed(19680801) fig = plt.figure(figsize=(8, 6)) ax = fig.add_subplot(211, facecolor='#FFFFCC') x = np.arange(0.0, 5.0, 0.01) y = np.sin(2*np.pi*x) + 0.5*np.random.randn(len(x)) ax.plot(x, y, '-') ax.set_ylim(-2, 2) ax.set_title('Press left mouse button and drag to test') ax2 = fig.add_subplot(212, facecolor='#FFFFCC') line2, = ax2.plot(x, y, '-') def onselect(xmin, xmax): indmin, indmax = np.searchsorted(x, (xmin, xmax)) indmax = min(len(x) - 1, indmax) thisx = x[indmin:indmax] thisy = y[indmin:indmax] line2.set_data(thisx, thisy) ax2.set_xlim(thisx[0], thisx[-1]) ax2.set_ylim(thisy.min(), thisy.max()) fig.canvas.draw() # set useblit True on gtkagg for enhanced performance span = SpanSelector(ax, onselect, 'horizontal', useblit=True, rectprops=dict(alpha=0.5, facecolor='red')) plt.show() **Total running time of the script:** ( 0 minutes 0.036 seconds) .. only :: html .. container:: sphx-glr-footer .. container:: sphx-glr-download :download:`Download Python source code: span_selector.py ` .. container:: sphx-glr-download :download:`Download Jupyter notebook: span_selector.ipynb ` .. only:: html .. rst-class:: sphx-glr-signature `Gallery generated by Sphinx-Gallery `_