.. _api-bbox_intersect:

api example code: bbox_intersect.py
===================================



.. plot:: /home/tcaswell/src/p/matplotlib/doc/mpl_examples/api/bbox_intersect.py

::

    """
    ===========================================
    Changing colors of lines intersecting a box
    ===========================================
    
    The lines intersecting the rectangle are colored in red, while the others
    are left as blue lines. This example showcases the `intersect_bbox` function.
    
    """
    
    import numpy as np
    import matplotlib.pyplot as plt
    from matplotlib.transforms import Bbox
    from matplotlib.path import Path
    
    left, bottom, width, height = (-1, -1, 2, 2)
    rect = plt.Rectangle((left, bottom), width, height, facecolor="#aaaaaa")
    
    fig, ax = plt.subplots()
    ax.add_patch(rect)
    
    bbox = Bbox.from_bounds(left, bottom, width, height)
    
    for i in range(12):
        vertices = (np.random.random((2, 2)) - 0.5) * 6.0
        path = Path(vertices)
        if path.intersects_bbox(bbox):
            color = 'r'
        else:
            color = 'b'
        ax.plot(vertices[:, 0], vertices[:, 1], color=color)
    
    plt.show()
    

Keywords: python, matplotlib, pylab, example, codex (see :ref:`how-to-search-examples`)