_test_pin_angle_.py

_test_pin_angle_.py

#!/usr/local/bin/python
# -*- coding: utf-8 -*-
'''_test_pin_angle_
pin 8->1 line = sqrt(3)/9 = 0.19245... = tan(0.1901256...) = 10.893... (degree)
tan(10.893 deg) = 0.1924...
tan(6 deg) = 0.1051...
tan(3 deg) = 0.0524...
'''

import sys, os
import numpy as np
from matplotlib import pyplot as plt

def draw_triangle(axes, r, c):
  d = 1 if c else 10
  ax = axes[r][c]
  ax.set_aspect('equal')

  s = 6
  r = s / 2
  h = r * np.sqrt(3)
  pl = (-r, h)
  pr = (r, h)
  pt = (0, 0)
  ax.plot((pl[0], pr[0]), (pl[1], pr[1]), 'r')
  ax.plot((pt[0], pr[0]), (pt[1], pr[1]), 'r')
  ax.plot((pl[0], pt[0]), (pl[1], pt[1]), 'r')

  m = lambda l, r, n: l[n] + (r[n] - l[n]) / 3.0
  n = 2 * d
  ax.plot((m(pl, pr, 0), pt[0]), (m(pl, pr, 1), pt[1]), 'c')
  ax.plot((-n * m(pl, pr, 0), pt[0]), (-n * m(pl, pr, 1), pt[1]), 'c')

  t = lambda a: np.tan(a * np.pi / 180)
  u = s * d
  for i, a in enumerate(((10.893, 'm'), (6.0, 'b'), (3.0, 'g'))):
    ax.plot((pt[0] + u * t(a[0]), pt[0]), (pt[1] - u, pt[1]), a[1], label='%7.3f' % a[0])

  v = 2 * s
  w = r * 1.3
  ax.plot((w, w), (-v * d, v), 'y')
  ax.plot((-w, -w), (-v * d, v), 'y')
  ax.set_xlim((-v, v))
  ax.set_ylim((-v * d, v))
  if c:
    ax.legend(bbox_to_anchor=(1, 1), loc='upper right', borderaxespad=0) # , fontsize=6)
  ax.set_title('angles (degree)')

def test_pin_angle():
  plt.rcParams['font.size'] = 6 # change all text
  plt.rcParams['font.family'] = 'sans-serif'
  # plt.rc('legend', fontsize=6) # ok (single property)
  fig = plt.figure(figsize=(6, 4), dpi=96)
  ROWS, COLS = 1, 2
  axes = [[fig.add_subplot(ROWS * 100 + COLS * (10 + r) + 1 + c) for c in range(COLS)] for r in range(ROWS)]
  for r, axr in enumerate(axes):
    for c, axc in enumerate(axes[r]):
      draw_triangle(axes, r, c)
  plt.show()

if __name__ == '__main__':
  test_pin_angle()