#!/usr/bin/env python
# angles.py - http://www.graphviz.org/Gallery/gradient/angles.html

from graphviz import Digraph

g = Digraph('G', filename='angles.gv')
g.attr(bgcolor='blue')

with g.subgraph(name='cluster_1') as c:
    c.attr(fontcolor='white')
    c.attr('node', shape='circle', style='filled', fillcolor='white:black',
           gradientangle='360', label='n9:360', fontcolor='black')
    c.node('n9')
    for i, a in zip(range(8, 0, -1), range(360 - 45, -1, -45)):
        c.attr('node', gradientangle='%d' % a, label='n%d:%d' % (i, a))
        c.node('n%d' % i)
    c.attr(label='Linear Angle Variations (white to black gradient)')

with g.subgraph(name='cluster_2') as c:
    c.attr(fontcolor='white')
    c.attr('node', shape='circle', style='radial', fillcolor='white:black',
           gradientangle='360', label='n18:360', fontcolor='black')
    c.node('n18')
    for i, a in zip(range(17, 9, -1), range(360 - 45, -1, -45)):
        c.attr('node', gradientangle='%d' % a, label='n%d:%d' % (i, a))
        c.node('n%d' % i)
    c.attr(label='Radial Angle Variations (white to black gradient)')

g.edge('n5', 'n14')

g.view()