Created
April 21, 2013 15:24
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Two figures
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| #!/usr/bin/env python2 | |
| '''Serving dynamic images with matplotlib (using flask).''' | |
| # No windows should pop up in a web server | |
| import matplotlib | |
| matplotlib.use('Agg') | |
| import matplotlib.pyplot as plt | |
| import numpy as np | |
| from cStringIO import StringIO | |
| from flask import Flask | |
| app = Flask(__name__) | |
| # HTML template, we embed base64 encoded image data in the <img> HTML element | |
| html = ''' | |
| <html> | |
| <body> | |
| <img src="data:image/png;base64,{}" /> | |
| <img src="data:image/png;base64,{}" /> | |
| </body> | |
| </html> | |
| ''' | |
| def img(xs, ys, label): | |
| fig = plt.figure(figsize=(8,3)) | |
| ax = fig.add_subplot(1, 1, 1) | |
| ax.plot(xs, ys, label=label) | |
| ax.legend() | |
| io = StringIO() | |
| fig.savefig(io, format='png') | |
| return io.getvalue().encode('base64') | |
| @app.route("/") | |
| def index(): | |
| xs = np.linspace(-10, 10, 1000) | |
| return html.format( | |
| img(xs, np.sin(xs), 'sin(x)'), | |
| img(xs, np.log(xs), 'log(x)') | |
| ) | |
| if __name__ == '__main__': | |
| app.run(debug=True) |
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