graphics.py 文件源码

def create_map():
    """
    create the base map for the choropleth.
    """
    logging.debug('create_map() -- Please wait while I create the world.')
    degrees_width = 118.0
    degrees_height = 55.0
    center_lat = 44.5
    center_lon = -110.0
    my_map = Basemap(  # ax=ax,
        projection='merc',  # default is cyl
        ellps='WGS84',
        lat_0=center_lat, lon_0=center_lon,
        llcrnrlat=center_lat - degrees_height / 2.0,
        llcrnrlon=center_lon - degrees_width / 2.0,
        urcrnrlat=center_lat + degrees_height / 2.0,
        urcrnrlon=center_lon + degrees_width / 2.0,
        resolution='i',  # 'c', 'l', 'i', 'h', 'f'
    )
    logging.debug('created map')
    logging.debug('loading shapes...')
    for section_name in CONTEST_SECTIONS.keys():
        # logging.debug('trying to load shape for %s', section_name)
        try:
            my_map.readshapefile('shapes/%s' % section_name, section_name, drawbounds=False)
        except IOError, err:
            logging.error('Could not load shape for %s' % section_name)

    logging.debug('loaded section shapes')
    return my_map