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75 lines
2.6 KiB
Markdown
75 lines
2.6 KiB
Markdown
# 雨模拟
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通过设置50个散点的比例和不透明度来模拟表面上的雨滴。
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作者：Nicolas P. Rougier
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```python
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import numpy as np
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import matplotlib.pyplot as plt
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from matplotlib.animation import FuncAnimation
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# Fixing random state for reproducibility
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np.random.seed(19680801)
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# Create new Figure and an Axes which fills it.
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fig = plt.figure(figsize=(7, 7))
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ax = fig.add_axes([0, 0, 1, 1], frameon=False)
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ax.set_xlim(0, 1), ax.set_xticks([])
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ax.set_ylim(0, 1), ax.set_yticks([])
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# Create rain data
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n_drops = 50
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rain_drops = np.zeros(n_drops, dtype=[('position', float, 2),
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('size', float, 1),
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('growth', float, 1),
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('color', float, 4)])
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# Initialize the raindrops in random positions and with
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# random growth rates.
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rain_drops['position'] = np.random.uniform(0, 1, (n_drops, 2))
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rain_drops['growth'] = np.random.uniform(50, 200, n_drops)
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# Construct the scatter which we will update during animation
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# as the raindrops develop.
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scat = ax.scatter(rain_drops['position'][:, 0], rain_drops['position'][:, 1],
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s=rain_drops['size'], lw=0.5, edgecolors=rain_drops['color'],
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facecolors='none')
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def update(frame_number):
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# Get an index which we can use to re-spawn the oldest raindrop.
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current_index = frame_number % n_drops
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# Make all colors more transparent as time progresses.
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rain_drops['color'][:, 3] -= 1.0/len(rain_drops)
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rain_drops['color'][:, 3] = np.clip(rain_drops['color'][:, 3], 0, 1)
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# Make all circles bigger.
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rain_drops['size'] += rain_drops['growth']
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# Pick a new position for oldest rain drop, resetting its size,
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# color and growth factor.
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rain_drops['position'][current_index] = np.random.uniform(0, 1, 2)
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rain_drops['size'][current_index] = 5
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rain_drops['color'][current_index] = (0, 0, 0, 1)
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rain_drops['growth'][current_index] = np.random.uniform(50, 200)
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# Update the scatter collection, with the new colors, sizes and positions.
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scat.set_edgecolors(rain_drops['color'])
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scat.set_sizes(rain_drops['size'])
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scat.set_offsets(rain_drops['position'])
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# Construct the animation, using the update function as the animation director.
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animation = FuncAnimation(fig, update, interval=10)
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plt.show()
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```
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## 下载这个示例
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- [下载python源码: rain.py](https://matplotlib.org/_downloads/rain.py)
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- [下载Jupyter notebook: rain.ipynb](https://matplotlib.org/_downloads/rain.ipynb) |