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from Tkinter import *
import math
import cy2geom
from cy2geom import Point, Path
def Nagon(N):
"""Return N-agon with side of length 1."""
side = cy2geom.LineSegment(Point(-0.5, 0), Point(0.5, 0))
angle = 2*math.pi/N
distance_to_center = 0.5 / math.tan(math.pi/N)
return Path.fromList(
[ side.transformed(
cy2geom.Translate(Point(0, -distance_to_center))*
cy2geom.Rotate(angle*i))
for i in range(N)
],
stitching = Path.STITCH_DISCONTINUOUS,
closed = True )
def draw(c, dt=0.001, batch=10, scale=20, x_offset = 400, y_offset = 300):
"""Draw curve or path."""
master = Tk()
w = Canvas(master, width=800, height=600)
w.pack()
n = 0
t = 0
points = []
if isinstance(c, Path):
maxt = c.size_default()
else:
maxt = 1
while (t < maxt):
t = n*dt
n+=1
p = c(t)
points.extend( [ p.x * scale + x_offset, p.y * scale + y_offset] )
while points:
draw_points = tuple(points[:batch*2])
if len(points) == 2:
break
del points[:batch*2]
l = w.create_line(*draw_points)
w.grid()
master.mainloop()
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