matplotlib & pandas

Python/matplotlab/gallery/misc/rasterization_demo.md

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+# 光栅化演示
+
+![光栅化演示](https://matplotlib.org/_images/sphx_glr_rasterization_demo_001.png)
+
+```python
+import numpy as np
+import matplotlib.pyplot as plt
+
+d = np.arange(100).reshape(10, 10)
+x, y = np.meshgrid(np.arange(11), np.arange(11))
+
+theta = 0.25*np.pi
+xx = x*np.cos(theta) - y*np.sin(theta)
+yy = x*np.sin(theta) + y*np.cos(theta)
+
+fig, ((ax1, ax2), (ax3, ax4)) = plt.subplots(2, 2)
+ax1.set_aspect(1)
+ax1.pcolormesh(xx, yy, d)
+ax1.set_title("No Rasterization")
+
+ax2.set_aspect(1)
+ax2.set_title("Rasterization")
+
+m = ax2.pcolormesh(xx, yy, d)
+m.set_rasterized(True)
+
+ax3.set_aspect(1)
+ax3.pcolormesh(xx, yy, d)
+ax3.text(0.5, 0.5, "Text", alpha=0.2,
+         va="center", ha="center", size=50, transform=ax3.transAxes)
+
+ax3.set_title("No Rasterization")
+
+
+ax4.set_aspect(1)
+m = ax4.pcolormesh(xx, yy, d)
+m.set_zorder(-20)
+
+ax4.text(0.5, 0.5, "Text", alpha=0.2,
+         zorder=-15,
+         va="center", ha="center", size=50, transform=ax4.transAxes)
+
+ax4.set_rasterization_zorder(-10)
+
+ax4.set_title("Rasterization z$<-10$")
+
+
+# ax2.title.set_rasterized(True) # should display a warning
+
+plt.savefig("test_rasterization.pdf", dpi=150)
+plt.savefig("test_rasterization.eps", dpi=150)
+
+if not plt.rcParams["text.usetex"]:
+    plt.savefig("test_rasterization.svg", dpi=150)
+    # svg backend currently ignores the dpi
+```
+
+## 下载这个示例
+            
+- [下载python源码: rasterization_demo.py](https://matplotlib.org/_downloads/rasterization_demo.py)
+- [下载Jupyter notebook: rasterization_demo.ipynb](https://matplotlib.org/_downloads/rasterization_demo.ipynb)