刻度定位器

显示不同的刻度定位器。

刻度定位器示例

  1. import numpy as np
  2. import matplotlib.pyplot as plt
  3. import matplotlib.ticker as ticker
  6. # Setup a plot such that only the bottom spine is shown
  7. def setup(ax):
  8.     ax.spines['right'].set_color('none')
  9.     ax.spines['left'].set_color('none')
  10.     ax.yaxis.set_major_locator(ticker.NullLocator())
  11.     ax.spines['top'].set_color('none')
  12.     ax.xaxis.set_ticks_position('bottom')
  13.     ax.tick_params(which='major', width=1.00)
  14.     ax.tick_params(which='major', length=5)
  15.     ax.tick_params(which='minor', width=0.75)
  16.     ax.tick_params(which='minor', length=2.5)
  17.     ax.set_xlim(0, 5)
  18.     ax.set_ylim(0, 1)
  19.     ax.patch.set_alpha(0.0)
  22. plt.figure(figsize=(8, 6))
  23. n = 8
  25. # Null Locator
  26. ax = plt.subplot(n, 1, 1)
  27. setup(ax)
  28. ax.xaxis.set_major_locator(ticker.NullLocator())
  29. ax.xaxis.set_minor_locator(ticker.NullLocator())
  30. ax.text(0.0, 0.1, "NullLocator()", fontsize=14, transform=ax.transAxes)
  32. # Multiple Locator
  33. ax = plt.subplot(n, 1, 2)
  34. setup(ax)
  35. ax.xaxis.set_major_locator(ticker.MultipleLocator(0.5))
  36. ax.xaxis.set_minor_locator(ticker.MultipleLocator(0.1))
  37. ax.text(0.0, 0.1, "MultipleLocator(0.5)", fontsize=14,
  38.         transform=ax.transAxes)
  40. # Fixed Locator
  41. ax = plt.subplot(n, 1, 3)
  42. setup(ax)
  43. majors = [0, 1, 5]
  44. ax.xaxis.set_major_locator(ticker.FixedLocator(majors))
  45. minors = np.linspace(0, 1, 11)[1:-1]
  46. ax.xaxis.set_minor_locator(ticker.FixedLocator(minors))
  47. ax.text(0.0, 0.1, "FixedLocator([0, 1, 5])", fontsize=14,
  48.         transform=ax.transAxes)
  50. # Linear Locator
  51. ax = plt.subplot(n, 1, 4)
  52. setup(ax)
  53. ax.xaxis.set_major_locator(ticker.LinearLocator(3))
  54. ax.xaxis.set_minor_locator(ticker.LinearLocator(31))
  55. ax.text(0.0, 0.1, "LinearLocator(numticks=3)",
  56.         fontsize=14, transform=ax.transAxes)
  58. # Index Locator
  59. ax = plt.subplot(n, 1, 5)
  60. setup(ax)
  61. ax.plot(range(0, 5), [0]*5, color='White')
  62. ax.xaxis.set_major_locator(ticker.IndexLocator(base=.5, offset=.25))
  63. ax.text(0.0, 0.1, "IndexLocator(base=0.5, offset=0.25)",
  64.         fontsize=14, transform=ax.transAxes)
  66. # Auto Locator
  67. ax = plt.subplot(n, 1, 6)
  68. setup(ax)
  69. ax.xaxis.set_major_locator(ticker.AutoLocator())
  70. ax.xaxis.set_minor_locator(ticker.AutoMinorLocator())
  71. ax.text(0.0, 0.1, "AutoLocator()", fontsize=14, transform=ax.transAxes)
  73. # MaxN Locator
  74. ax = plt.subplot(n, 1, 7)
  75. setup(ax)
  76. ax.xaxis.set_major_locator(ticker.MaxNLocator(4))
  77. ax.xaxis.set_minor_locator(ticker.MaxNLocator(40))
  78. ax.text(0.0, 0.1, "MaxNLocator(n=4)", fontsize=14, transform=ax.transAxes)
  80. # Log Locator
  81. ax = plt.subplot(n, 1, 8)
  82. setup(ax)
  83. ax.set_xlim(10**3, 10**10)
  84. ax.set_xscale('log')
  85. ax.xaxis.set_major_locator(ticker.LogLocator(base=10.0, numticks=15))
  86. ax.text(0.0, 0.1, "LogLocator(base=10, numticks=15)",
  87.         fontsize=15, transform=ax.transAxes)
  89. # Push the top of the top axes outside the figure because we only show the
  90. # bottom spine.
  91. plt.subplots_adjust(left=0.05, right=0.95, bottom=0.05, top=1.05)
  93. plt.show()

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