演示浮动轴2

轴在矩形框内

以下代码演示了如何将浮动极坐标曲线放在矩形框内。 为了更好地了解极坐标曲线，请查看demo_curvelinear_grid.py。

演示浮动轴2

  1. import numpy as np
  2. import matplotlib.pyplot as plt
  3. import mpl_toolkits.axisartist.angle_helper as angle_helper
  4. from matplotlib.projections import PolarAxes
  5. from matplotlib.transforms import Affine2D
  6. from mpl_toolkits.axisartist import SubplotHost
  7. from mpl_toolkits.axisartist import GridHelperCurveLinear
  10. def curvelinear_test2(fig):
  11.     """Polar projection, but in a rectangular box.
  12.     """
  13.     # see demo_curvelinear_grid.py for details
  14.     tr = Affine2D().scale(np.pi / 180., 1.) + PolarAxes.PolarTransform()
  16.     extreme_finder = angle_helper.ExtremeFinderCycle(20,
  17.                                                      20,
  18.                                                      lon_cycle=360,
  19.                                                      lat_cycle=None,
  20.                                                      lon_minmax=None,
  21.                                                      lat_minmax=(0,
  22.                                                                  np.inf),
  23.                                                      )
  25.     grid_locator1 = angle_helper.LocatorDMS(12)
  27.     tick_formatter1 = angle_helper.FormatterDMS()
  29.     grid_helper = GridHelperCurveLinear(tr,
  30.                                         extreme_finder=extreme_finder,
  31.                                         grid_locator1=grid_locator1,
  32.                                         tick_formatter1=tick_formatter1
  33.                                         )
  35.     ax1 = SubplotHost(fig, 1, 1, 1, grid_helper=grid_helper)
  37.     fig.add_subplot(ax1)
  39.     # Now creates floating axis
  41.     # floating axis whose first coordinate (theta) is fixed at 60
  42.     ax1.axis["lat"] = axis = ax1.new_floating_axis(0, 60)
  43.     axis.label.set_text(r"$\theta = 60^{\circ}$")
  44.     axis.label.set_visible(True)
  46.     # floating axis whose second coordinate (r) is fixed at 6
  47.     ax1.axis["lon"] = axis = ax1.new_floating_axis(1, 6)
  48.     axis.label.set_text(r"$r = 6$")
  50.     ax1.set_aspect(1.)
  51.     ax1.set_xlim(-5, 12)
  52.     ax1.set_ylim(-5, 10)
  54.     ax1.grid(True)
  56. fig = plt.figure(1, figsize=(5, 5))
  57. fig.clf()
  59. curvelinear_test2(fig)
  61. plt.show()

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