matplotlib & pandas

Python/matplotlab/gallery/event_handling/image_slices_viewer.md

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+# 图像切片查看器
+
+滚动三维阵列的二维图像切片。
+
+![图像切片查看器](https://matplotlib.org/_images/sphx_glr_image_slices_viewer_001.png)
+
+```python
+import numpy as np
+import matplotlib.pyplot as plt
+
+
+class IndexTracker(object):
+    def __init__(self, ax, X):
+        self.ax = ax
+        ax.set_title('use scroll wheel to navigate images')
+
+        self.X = X
+        rows, cols, self.slices = X.shape
+        self.ind = self.slices//2
+
+        self.im = ax.imshow(self.X[:, :, self.ind])
+        self.update()
+
+    def onscroll(self, event):
+        print("%s %s" % (event.button, event.step))
+        if event.button == 'up':
+            self.ind = (self.ind + 1) % self.slices
+        else:
+            self.ind = (self.ind - 1) % self.slices
+        self.update()
+
+    def update(self):
+        self.im.set_data(self.X[:, :, self.ind])
+        ax.set_ylabel('slice %s' % self.ind)
+        self.im.axes.figure.canvas.draw()
+
+
+fig, ax = plt.subplots(1, 1)
+
+X = np.random.rand(20, 20, 40)
+
+tracker = IndexTracker(ax, X)
+
+
+fig.canvas.mpl_connect('scroll_event', tracker.onscroll)
+plt.show()
+```
+
+## 下载这个示例
+            
+- [下载python源码: image_slices_viewer.py](https://matplotlib.org/_downloads/image_slices_viewer.py)
+- [下载Jupyter notebook: image_slices_viewer.ipynb](https://matplotlib.org/_downloads/image_slices_viewer.ipynb)