python 如何在 Django 中使用 Matplotlib？
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How to use Matplotlib in Django?
提问by Hyman Ha
From some examples from the Internet I made the test code below. It works!
从网上的一些例子我做了下面的测试代码。有用！
... BUT if I reload the page, the pie will draw itself with the same image. Some parts get darker every time I reload the page. When I restart the the development server, it is reset. How do I draw properly with Matplotlibin Django? It looks like it remembers some drawings...
...但是如果我重新加载页面，饼图会用相同的图像绘制自己。每次我重新加载页面时，有些部分会变暗。当我重新启动开发服务器时，它被重置。如何在 Django 中使用Matplotlib正确绘制？看起来它记得一些图画......
Source views.py (let urls.py link to it):
源 views.py（让 urls.py 链接到它）：
from pylab import figure, axes, pie, title
from matplotlib.backends.backend_agg import FigureCanvasAgg
def test_matplotlib(request):
f = figure(1, figsize=(6,6))
ax = axes([0.1, 0.1, 0.8, 0.8])
labels = 'Frogs', 'Hogs', 'Dogs', 'Logs'
fracs = [15,30,45, 10]
explode=(0, 0.05, 0, 0)
pie(fracs, explode=explode, labels=labels, autopct='%1.1f%%', shadow=True)
title('Raining Hogs and Dogs', bbox={'facecolor':'0.8', 'pad':5})
canvas = FigureCanvasAgg(f)
response = HttpResponse(content_type='image/png')
canvas.print_png(response)
return response
I am using Django 1.0.1 and Python 2.6.2 (Linux).
我正在使用 Django 1.0.1 和 Python 2.6.2 (Linux)。
回答by Cristian Ciupitu
You need to remove the numparameter from the figure constructorand closethe figure when you're done with it.
import matplotlib.pyplot
def test_matplotlib(request):
f = figure(figsize=(6,6))
....
matplotlib.pyplot.close(f)
By removing the numparameter, you'll avoid using the same figure at the same time. This could happen if 2 browsers request the image at the same time. If this is not an issue, another possible solution is to use the clearmethod, i.e. f.clear().
通过删除num参数，您将避免同时使用相同的图形。如果 2 个浏览器同时请求图像，就会发生这种情况。如果这不是问题，另一种可能的解决方案是使用clear方法，即f.clear()。
回答by chenxuZhu
1.save picture which created by matplotlib
for example:plt.savefig('./app1/static/visualize.png')
2.use the picture in your html code
for example:
1.保存由matplotlib创建的图片，
例如：plt.savefig('./app1/static/visualize.png') 2.在你的html代码中使用图片，例如：
about django how to use static variable(like picture and js file) you can refer to django document
关于django如何使用静态变量（如图片和js文件）可以参考django文档
