matplotlib & pandas

Python/matplotlab/gallery/units/artist_tests.md

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+# 艺术家对象测试
+
+每个Matplotlib原始艺术家类型的测试单元支持。
+
+轴处理单位转换，艺术家保留指向其父轴的指针。如果要将它们与单位数据一起使用，则必须使用轴实例初始化艺术家，否则他们将不知道如何将单位转换为标量。
+
+此示例需要 [basic_units.py](https://matplotlib.org/_downloads/3a73b4cd6e12aa53ff277b1b80d631c1/basic_units.py)
+
+![艺术家对象测试示例](https://matplotlib.org/_images/sphx_glr_artist_tests_001.png)
+
+```python
+import random
+import matplotlib.lines as lines
+import matplotlib.patches as patches
+import matplotlib.text as text
+import matplotlib.collections as collections
+
+from basic_units import cm, inch
+import numpy as np
+import matplotlib.pyplot as plt
+
+fig, ax = plt.subplots()
+ax.xaxis.set_units(cm)
+ax.yaxis.set_units(cm)
+
+# Fixing random state for reproducibility
+np.random.seed(19680801)
+
+if 0:
+    # test a line collection
+    # Not supported at present.
+    verts = []
+    for i in range(10):
+        # a random line segment in inches
+        verts.append(zip(*inch*10*np.random.rand(2, random.randint(2, 15))))
+    lc = collections.LineCollection(verts, axes=ax)
+    ax.add_collection(lc)
+
+# test a plain-ol-line
+line = lines.Line2D([0*cm, 1.5*cm], [0*cm, 2.5*cm],
+                    lw=2, color='black', axes=ax)
+ax.add_line(line)
+
+if 0:
+    # test a patch
+    # Not supported at present.
+    rect = patches.Rectangle((1*cm, 1*cm), width=5*cm, height=2*cm,
+                             alpha=0.2, axes=ax)
+    ax.add_patch(rect)
+
+
+t = text.Text(3*cm, 2.5*cm, 'text label', ha='left', va='bottom', axes=ax)
+ax.add_artist(t)
+
+ax.set_xlim(-1*cm, 10*cm)
+ax.set_ylim(-1*cm, 10*cm)
+# ax.xaxis.set_units(inch)
+ax.grid(True)
+ax.set_title("Artists with units")
+plt.show()
+```
+
+## 下载这个示例
+            
+- [下载python源码: artist_tests.py](https://matplotlib.org/_downloads/artist_tests.py)
+- [下载Jupyter notebook: artist_tests.ipynb](https://matplotlib.org/_downloads/artist_tests.ipynb)