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from math import sqrt
from shapely import affinity
GM = (sqrt(5)-1.0)/2.0
W = 8.0
H = W*GM
SIZE = (W, H)
BLUE = '#6699cc'
GRAY = '#999999'
DARKGRAY = '#333333'
YELLOW = '#ffcc33'
GREEN = '#339933'
RED = '#ff3333'
BLACK = '#000000'
def add_origin(ax, geom, origin):
x, y = xy = affinity.interpret_origin(geom, origin, 2)
ax.plot(x, y, 'o', color=GRAY, zorder=1)
ax.annotate(str(xy), xy=xy, ha='center',
textcoords='offset points', xytext=(0, 8))
def set_limits(ax, x0, xN, y0, yN):
ax.set_xlim(x0, xN)
ax.set_xticks(range(x0, xN+1))
ax.set_ylim(y0, yN)
ax.set_yticks(range(y0, yN+1))
ax.set_aspect("equal")
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