刻度格式化程序

显示不同的刻度格式化程序。

刻度格式化程序示例

  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, length=5)
  14.     ax.tick_params(which='minor', width=0.75, length=2.5, labelsize=10)
  15.     ax.set_xlim(0, 5)
  16.     ax.set_ylim(0, 1)
  17.     ax.patch.set_alpha(0.0)
  20. fig = plt.figure(figsize=(8, 6))
  21. n = 7
  23. # Null formatter
  24. ax = fig.add_subplot(n, 1, 1)
  25. setup(ax)
  26. ax.xaxis.set_major_locator(ticker.MultipleLocator(1.00))
  27. ax.xaxis.set_minor_locator(ticker.MultipleLocator(0.25))
  28. ax.xaxis.set_major_formatter(ticker.NullFormatter())
  29. ax.xaxis.set_minor_formatter(ticker.NullFormatter())
  30. ax.text(0.0, 0.1, "NullFormatter()", fontsize=16, transform=ax.transAxes)
  32. # Fixed formatter
  33. ax = fig.add_subplot(n, 1, 2)
  34. setup(ax)
  35. ax.xaxis.set_major_locator(ticker.MultipleLocator(1.0))
  36. ax.xaxis.set_minor_locator(ticker.MultipleLocator(0.25))
  37. majors = ["", "0", "1", "2", "3", "4", "5"]
  38. ax.xaxis.set_major_formatter(ticker.FixedFormatter(majors))
  39. minors = [""] + ["%.2f" % (x-int(x)) if (x-int(x))
  40.                  else "" for x in np.arange(0, 5, 0.25)]
  41. ax.xaxis.set_minor_formatter(ticker.FixedFormatter(minors))
  42. ax.text(0.0, 0.1, "FixedFormatter(['', '0', '1', ...])",
  43.         fontsize=15, transform=ax.transAxes)
  46. # FuncFormatter can be used as a decorator
  47. @ticker.FuncFormatter
  48. def major_formatter(x, pos):
  49.     return "[%.2f]" % x
  52. ax = fig.add_subplot(n, 1, 3)
  53. setup(ax)
  54. ax.xaxis.set_major_locator(ticker.MultipleLocator(1.00))
  55. ax.xaxis.set_minor_locator(ticker.MultipleLocator(0.25))
  56. ax.xaxis.set_major_formatter(major_formatter)
  57. ax.text(0.0, 0.1, 'FuncFormatter(lambda x, pos: "[%.2f]" % x)',
  58.         fontsize=15, transform=ax.transAxes)
  61. # FormatStr formatter
  62. ax = fig.add_subplot(n, 1, 4)
  63. setup(ax)
  64. ax.xaxis.set_major_locator(ticker.MultipleLocator(1.00))
  65. ax.xaxis.set_minor_locator(ticker.MultipleLocator(0.25))
  66. ax.xaxis.set_major_formatter(ticker.FormatStrFormatter(">%d<"))
  67. ax.text(0.0, 0.1, "FormatStrFormatter('>%d<')",
  68.         fontsize=15, transform=ax.transAxes)
  70. # Scalar formatter
  71. ax = fig.add_subplot(n, 1, 5)
  72. setup(ax)
  73. ax.xaxis.set_major_locator(ticker.AutoLocator())
  74. ax.xaxis.set_minor_locator(ticker.AutoMinorLocator())
  75. ax.xaxis.set_major_formatter(ticker.ScalarFormatter(useMathText=True))
  76. ax.text(0.0, 0.1, "ScalarFormatter()", fontsize=15, transform=ax.transAxes)
  78. # StrMethod formatter
  79. ax = fig.add_subplot(n, 1, 6)
  80. setup(ax)
  81. ax.xaxis.set_major_locator(ticker.MultipleLocator(1.00))
  82. ax.xaxis.set_minor_locator(ticker.MultipleLocator(0.25))
  83. ax.xaxis.set_major_formatter(ticker.StrMethodFormatter("{x}"))
  84. ax.text(0.0, 0.1, "StrMethodFormatter('{x}')",
  85.         fontsize=15, transform=ax.transAxes)
  87. # Percent formatter
  88. ax = fig.add_subplot(n, 1, 7)
  89. setup(ax)
  90. ax.xaxis.set_major_locator(ticker.MultipleLocator(1.00))
  91. ax.xaxis.set_minor_locator(ticker.MultipleLocator(0.25))
  92. ax.xaxis.set_major_formatter(ticker.PercentFormatter(xmax=5))
  93. ax.text(0.0, 0.1, "PercentFormatter(xmax=5)",
  94.         fontsize=15, transform=ax.transAxes)
  96. # Push the top of the top axes outside the figure because we only show the
  97. # bottom spine.
  98. fig.subplots_adjust(left=0.05, right=0.95, bottom=0.05, top=1.05)
  100. plt.show()

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