gamma ray satellite

def main():

    import matplotlib.pyplot as plt
    plt.rcdefaults()

    import numpy as np
    import matplotlib.pyplot as plt
    import matplotlib.path as mpath
    import matplotlib.lines as mlines
    import matplotlib.patches as mpatches
    from matplotlib.collections import PatchCollection

    satellites = {
        'fermi':{'start':2008,
                 'end':2020,
                 'low':10e3,
                 'high':300e9},
        'swift':{'start':2004,
                 'end':2020,
                 'low':0.2e3,
                 'high':150e3},
        'cgro':{'start':1991,
                'end':2000,
                'low':20e3,
                'high':30e9},
        'integral':{'start':2002,
                    'end':2020,
                    'low':15e3,
                    'high':30e6},
        'hete-2':{'start':2000,
                  'end':2008,
                  'low':0.5e3,
                  'high':400e3},
        'gamma':{'start':1991,
                 'end':1992,
                 'low':50e6,
                 'high':6e9},
        'ulysses':{'start':1990,
                   'end':2009,
                   'low':15e3,
                   'high':150e3},
        'sross':{'start':1987,
                   'end':2001,
                   'low':20e3,
                   'high':3000e3},
        'eureca':{'start':1992,
                   'end':1993,
                   'low':6e3,
                   'high':150e3},
        'mars observer':{'start':1992,
                         'end':1993,
                         'low':0.5e6,
                         'high':2e6},
        'wind':{'start':1994,
                'end':2020,
                'low':15e3,
                'high':10e6},
        'rxte':{'start':1995,
                'end':2012,
                'low':2e3,
                'high':250e3},
        'near':{'start':1996,
                'end':2001,
                'low':0.3e6,
                'high':10e6}
        }

    patches = []

    fig, ax = plt.subplots()

    for sat_id in satellites:
        sat = satellites[sat_id]
        patches.append(mpatches.Rectangle([sat['low'],sat['start']],
                                          sat['high']-sat['low'],
                                          sat['end']-sat['start'],
                                          ec='none'))
        ax.text(#np.sqrt(sat['low']*sat['high']),
            sat['low']**0.7*sat['high']**0.3,
            sat['start']*0.7+sat['end']*0.3,
            sat_id)

    colors = np.linspace(0, 1, len(patches))
    collection = PatchCollection(patches, cmap=plt.cm.hsv, alpha=0.3)
    collection.set_array(np.array(colors))
    ax.add_collection(collection)
    ax.set_xscale('log')
    plt.axis('equal')
    ax.set_xlabel('Energy [eV]')
    ax.set_ylabel('Year')
    #plt.axis('off')

    plt.show()

if __name__ == '__main__':

    main()