# paste this code at the end of VectorFieldPlot 1.0
doc = FieldplotDocument('VFPt_charges_plus_plus', commons=True)
field = Field({'monopoles':[[-1,0,1], [1,0,1]]})
doc.draw_charges(field)
for x in [-1, 1]:
    line = FieldLine(field, [x,0], start_v=[-x, 0],
        directions='forward')
    doc.draw_line(line, arrows_style={'dist': 1.2, 'min_arrows': 1,
        'max_arrows':1, 'offsets':[0.64, 0.5, 0.5, 0.36]})
n = 32
for i in range(n):
    a = 2.0 * pi * (0.5 + i) / n
    line = FieldLine(field, [10.*cos(a), 10.*sin(a)],
        directions='backward')
    doc.draw_line(line, arrows_style={'dist':3.0, 'min_arrows':1,
        'max_arrows':1, 'fixed_ends':[True, False, False, False]})
doc.write()