matplotlib & pandas

Python/matplotlab/gallery/axisartist/demo_floating_axis.md

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+# 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](https://matplotlib.org/_images/sphx_glr_demo_floating_axis_001.png)
+
+```python
+import numpy as np
+import matplotlib.pyplot as plt
+import mpl_toolkits.axisartist.angle_helper as angle_helper
+from matplotlib.projections import PolarAxes
+from matplotlib.transforms import Affine2D
+from mpl_toolkits.axisartist import SubplotHost
+from mpl_toolkits.axisartist import GridHelperCurveLinear
+
+
+def curvelinear_test2(fig):
+    """Polar projection, but in a rectangular box.
+    """
+    # see demo_curvelinear_grid.py for details
+    tr = Affine2D().scale(np.pi / 180., 1.) + PolarAxes.PolarTransform()
+
+    extreme_finder = angle_helper.ExtremeFinderCycle(20,
+                                                     20,
+                                                     lon_cycle=360,
+                                                     lat_cycle=None,
+                                                     lon_minmax=None,
+                                                     lat_minmax=(0,
+                                                                 np.inf),
+                                                     )
+
+    grid_locator1 = angle_helper.LocatorDMS(12)
+
+    tick_formatter1 = angle_helper.FormatterDMS()
+
+    grid_helper = GridHelperCurveLinear(tr,
+                                        extreme_finder=extreme_finder,
+                                        grid_locator1=grid_locator1,
+                                        tick_formatter1=tick_formatter1
+                                        )
+
+    ax1 = SubplotHost(fig, 1, 1, 1, grid_helper=grid_helper)
+
+    fig.add_subplot(ax1)
+
+    # Now creates floating axis
+
+    # floating axis whose first coordinate (theta) is fixed at 60
+    ax1.axis["lat"] = axis = ax1.new_floating_axis(0, 60)
+    axis.label.set_text(r"$\theta = 60^{\circ}$")
+    axis.label.set_visible(True)
+
+    # floating axis whose second coordinate (r) is fixed at 6
+    ax1.axis["lon"] = axis = ax1.new_floating_axis(1, 6)
+    axis.label.set_text(r"$r = 6$")
+
+    ax1.set_aspect(1.)
+    ax1.set_xlim(-5, 12)
+    ax1.set_ylim(-5, 10)
+
+    ax1.grid(True)
+
+fig = plt.figure(1, figsize=(5, 5))
+fig.clf()
+
+curvelinear_test2(fig)
+
+plt.show()
+```
+
+## 下载这个示例
+            
+- [下载python源码: demo_floating_axis.py](https://matplotlib.org/_downloads/demo_floating_axis.py)
+- [下载Jupyter notebook: demo_floating_axis.ipynb](https://matplotlib.org/_downloads/demo_floating_axis.ipynb)