Usetex 演示

演示如何在绘制中使用latex。

另请参阅 “使用latex进行文本渲染” 指南。

Usetex 演示

  1. import numpy as np
  2. import matplotlib.pyplot as plt
  3. plt.rc('text', usetex=True)
  5. # interface tracking profiles
  6. N = 500
  7. delta = 0.6
  8. X = np.linspace(-1, 1, N)
  9. plt.plot(X, (1 - np.tanh(4 * X / delta)) / 2,    # phase field tanh profiles
  10.          X, (1.4 + np.tanh(4 * X / delta)) / 4, "C2",  # composition profile
  11.          X, X < 0, 'k--')                        # sharp interface
  13. # legend
  14. plt.legend(('phase field', 'level set', 'sharp interface'),
  15.            shadow=True, loc=(0.01, 0.48), handlelength=1.5, fontsize=16)
  17. # the arrow
  18. plt.annotate("", xy=(-delta / 2., 0.1), xycoords='data',
  19.              xytext=(delta / 2., 0.1), textcoords='data',
  20.              arrowprops=dict(arrowstyle="<->", connectionstyle="arc3"))
  21. plt.text(0, 0.1, r'$\delta$',
  22.          {'color': 'k', 'fontsize': 24, 'ha': 'center', 'va': 'center',
  23.           'bbox': dict(boxstyle="round", fc="w", ec="k", pad=0.2)})
  25. # Use tex in labels
  26. plt.xticks((-1, 0, 1), ('$-1$', r'$\pm 0$', '$+1$'), color='k', size=20)
  28. # Left Y-axis labels, combine math mode and text mode
  29. plt.ylabel(r'\bf{phase field} $\phi$', {'color': 'C0', 'fontsize': 20})
  30. plt.yticks((0, 0.5, 1), (r'\bf{0}', r'\bf{.5}', r'\bf{1}'), color='k', size=20)
  32. # Right Y-axis labels
  33. plt.text(1.02, 0.5, r"\bf{level set} $\phi$", {'color': 'C2', 'fontsize': 20},
  34.          horizontalalignment='left',
  35.          verticalalignment='center',
  36.          rotation=90,
  37.          clip_on=False,
  38.          transform=plt.gca().transAxes)
  40. # Use multiline environment inside a `text`.
  41. # level set equations
  42. eq1 = r"\begin{eqnarray*}" + \
  43.       r"|\nabla\phi| &=& 1,\\" + \
  44.       r"\frac{\partial \phi}{\partial t} + U|\nabla \phi| &=& 0 " + \
  45.       r"\end{eqnarray*}"
  46. plt.text(1, 0.9, eq1, {'color': 'C2', 'fontsize': 18}, va="top", ha="right")
  48. # phase field equations
  49. eq2 = r'\begin{eqnarray*}' + \
  50.       r'\mathcal{F} &=& \int f\left( \phi, c \right) dV, \\ ' + \
  51.       r'\frac{ \partial \phi } { \partial t } &=& -M_{ \phi } ' + \
  52.       r'\frac{ \delta \mathcal{F} } { \delta \phi }' + \
  53.       r'\end{eqnarray*}'
  54. plt.text(0.18, 0.18, eq2, {'color': 'C0', 'fontsize': 16})
  56. plt.text(-1, .30, r'gamma: $\gamma$', {'color': 'r', 'fontsize': 20})
  57. plt.text(-1, .18, r'Omega: $\Omega$', {'color': 'b', 'fontsize': 20})
  59. plt.show()

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