Cartopy resize colorbar

resize_colorbar.py

def get_resize_event_function(ax, cbar_ax):
    """
    Returns a function to automatically resize the colorbar
    for cartopy plots
    
    Parameters
    ----------
    ax : axis
    cbar_ax : colorbar axis
    
    Example
    -------
        import cartopy.crs as ccrs
        import matplotlib.pyplot as plt
    
        fig, ax = plt.subplots(figsize=(10,5), subplot_kw={'projection': ccrs.PlateCarree()})
        cbar_ax = fig.add_axes([0, 0, 0.1, 0.1])
        
        [... your code generating a scalar mappable ...]
    
        resize_colorbar = get_resize_event_function(ax, cbar_ax)
        fig.canvas.mpl_connect('resize_event', resize_colorbar)
    
    Credits
    -------
    Solution by pelson at http://stackoverflow.com/a/30077745/512111
    """
    def resize_colorbar(event):
        plt.draw()
        posn = ax.get_position()
        cbar_ax.set_position([posn.x0 + posn.width + 0.01, posn.y0,
                              0.04, posn.height])
    return resize_colorbar