椭圆与单位

比较用弧形生成的椭圆与多边形近似

此示例需要 basic_units.py

  1. from basic_units import cm
  2. import numpy as np
  3. from matplotlib import patches
  4. import matplotlib.pyplot as plt
  7. xcenter, ycenter = 0.38*cm, 0.52*cm
  8. width, height = 1e-1*cm, 3e-1*cm
  9. angle = -30
  11. theta = np.deg2rad(np.arange(0.0, 360.0, 1.0))
  12. x = 0.5 * width * np.cos(theta)
  13. y = 0.5 * height * np.sin(theta)
  15. rtheta = np.radians(angle)
  16. R = np.array([
  17.     [np.cos(rtheta), -np.sin(rtheta)],
  18.     [np.sin(rtheta),  np.cos(rtheta)],
  19.     ])
  22. x, y = np.dot(R, np.array([x, y]))
  23. x += xcenter
  24. y += ycenter
  1. fig = plt.figure()
  2. ax = fig.add_subplot(211, aspect='auto')
  3. ax.fill(x, y, alpha=0.2, facecolor='yellow',
  4.         edgecolor='yellow', linewidth=1, zorder=1)
  6. e1 = patches.Ellipse((xcenter, ycenter), width, height,
  7.                      angle=angle, linewidth=2, fill=False, zorder=2)
  9. ax.add_patch(e1)
  11. ax = fig.add_subplot(212, aspect='equal')
  12. ax.fill(x, y, alpha=0.2, facecolor='green', edgecolor='green', zorder=1)
  13. e2 = patches.Ellipse((xcenter, ycenter), width, height,
  14.                      angle=angle, linewidth=2, fill=False, zorder=2)
  17. ax.add_patch(e2)
  18. fig.savefig('ellipse_compare')

椭圆与单位示例

  1. fig = plt.figure()
  2. ax = fig.add_subplot(211, aspect='auto')
  3. ax.fill(x, y, alpha=0.2, facecolor='yellow',
  4.         edgecolor='yellow', linewidth=1, zorder=1)
  6. e1 = patches.Arc((xcenter, ycenter), width, height,
  7.                  angle=angle, linewidth=2, fill=False, zorder=2)
  9. ax.add_patch(e1)
  11. ax = fig.add_subplot(212, aspect='equal')
  12. ax.fill(x, y, alpha=0.2, facecolor='green', edgecolor='green', zorder=1)
  13. e2 = patches.Arc((xcenter, ycenter), width, height,
  14.                  angle=angle, linewidth=2, fill=False, zorder=2)
  17. ax.add_patch(e2)
  18. fig.savefig('arc_compare')
  20. plt.show()

椭圆与单位示例2

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