演示Curvelinear网格2

自定义网格和记号行。

此示例演示如何通过在网格上应用转换，使用GridHelperCurve线性来定义自定义网格和注释行。作为打印上的演示，轴上将显示5x5矩阵。

Curvelinear网格2示例

  1. import numpy as np
  2. import matplotlib.pyplot as plt
  4. from mpl_toolkits.axisartist.grid_helper_curvelinear import \
  5.     GridHelperCurveLinear
  6. from mpl_toolkits.axisartist.axislines import Subplot
  8. import mpl_toolkits.axisartist.angle_helper as angle_helper
  11. def curvelinear_test1(fig):
  12.     """
  13.     grid for custom transform.
  14.     """
  16.     def tr(x, y):
  17.         sgn = np.sign(x)
  18.         x, y = np.abs(np.asarray(x)), np.asarray(y)
  19.         return sgn*x**.5, y
  21.     def inv_tr(x, y):
  22.         sgn = np.sign(x)
  23.         x, y = np.asarray(x), np.asarray(y)
  24.         return sgn*x**2, y
  26.     extreme_finder = angle_helper.ExtremeFinderCycle(20, 20,
  27.                                                      lon_cycle=None,
  28.                                                      lat_cycle=None,
  29.                                                      # (0, np.inf),
  30.                                                      lon_minmax=None,
  31.                                                      lat_minmax=None,
  32.                                                      )
  34.     grid_helper = GridHelperCurveLinear((tr, inv_tr),
  35.                                         extreme_finder=extreme_finder)
  37.     ax1 = Subplot(fig, 111, grid_helper=grid_helper)
  38.     # ax1 will have a ticks and gridlines defined by the given
  39.     # transform (+ transData of the Axes). Note that the transform of
  40.     # the Axes itself (i.e., transData) is not affected by the given
  41.     # transform.
  43.     fig.add_subplot(ax1)
  45.     ax1.imshow(np.arange(25).reshape(5, 5),
  46.                vmax=50, cmap=plt.cm.gray_r,
  47.                interpolation="nearest",
  48.                origin="lower")
  50.     # tick density
  51.     grid_helper.grid_finder.grid_locator1._nbins = 6
  52.     grid_helper.grid_finder.grid_locator2._nbins = 6
  55. if 1:
  56.     fig = plt.figure(1, figsize=(7, 4))
  57.     fig.clf()
  59.     curvelinear_test1(fig)
  60.     plt.show()

下载这个示例