.. _pylab_examples-demo_annotation_box:

pylab_examples example code: demo_annotation_box.py
===================================================



.. plot:: /home/tcaswell/src/p/matplotlib/doc/mpl_examples/pylab_examples/demo_annotation_box.py

::

    import matplotlib.pyplot as plt
    import numpy as np
    
    from matplotlib.patches import Circle
    from matplotlib.offsetbox import (TextArea, DrawingArea, OffsetImage,
                                      AnnotationBbox)
    from matplotlib.cbook import get_sample_data
    
    
    if 1:
        fig, ax = plt.subplots()
    
        # Define a 1st position to annotate (display it with a marker)
        xy = (0.5, 0.7)
        ax.plot(xy[0], xy[1], ".r")
    
        # Annotate the 1st position with a text box ('Test 1')
        offsetbox = TextArea("Test 1", minimumdescent=False)
    
        ab = AnnotationBbox(offsetbox, xy,
                            xybox=(-20, 40),
                            xycoords='data',
                            boxcoords="offset points",
                            arrowprops=dict(arrowstyle="->"))
        ax.add_artist(ab)
    
        # Annotate the 1st position with another text box ('Test')
        offsetbox = TextArea("Test", minimumdescent=False)
    
        ab = AnnotationBbox(offsetbox, xy,
                            xybox=(1.02, xy[1]),
                            xycoords='data',
                            boxcoords=("axes fraction", "data"),
                            box_alignment=(0., 0.5),
                            arrowprops=dict(arrowstyle="->"))
        ax.add_artist(ab)
    
        # Define a 2nd position to annotate (don't display with a marker this time)
        xy = [0.3, 0.55]
    
        # Annotate the 2nd position with a circle patch
        da = DrawingArea(20, 20, 0, 0)
        p = Circle((10, 10), 10)
        da.add_artist(p)
    
        ab = AnnotationBbox(da, xy,
                            xybox=(1.02, xy[1]),
                            xycoords='data',
                            boxcoords=("axes fraction", "data"),
                            box_alignment=(0., 0.5),
                            arrowprops=dict(arrowstyle="->"))
    
        ax.add_artist(ab)
    
        # Annotate the 2nd position with an image (a generated array of pixels)
        arr = np.arange(100).reshape((10, 10))
        im = OffsetImage(arr, zoom=2)
        im.image.axes = ax
    
        ab = AnnotationBbox(im, xy,
                            xybox=(-50., 50.),
                            xycoords='data',
                            boxcoords="offset points",
                            pad=0.3,
                            arrowprops=dict(arrowstyle="->"))
    
        ax.add_artist(ab)
    
        # Annotate the 2nd position with another image (a Grace Hopper portrait)
        fn = get_sample_data("grace_hopper.png", asfileobj=False)
        arr_img = plt.imread(fn, format='png')
    
        imagebox = OffsetImage(arr_img, zoom=0.2)
        imagebox.image.axes = ax
    
        ab = AnnotationBbox(imagebox, xy,
                            xybox=(120., -80.),
                            xycoords='data',
                            boxcoords="offset points",
                            pad=0.5,
                            arrowprops=dict(
                                arrowstyle="->",
                                connectionstyle="angle,angleA=0,angleB=90,rad=3")
                            )
    
        ax.add_artist(ab)
    
        # Fix the display limits to see everything
        ax.set_xlim(0, 1)
        ax.set_ylim(0, 1)
    
        plt.show()
    

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