Pyqtgraph For Plotting Multiple Data Lists

At the moment I am using matplotlib to plot multiple numpy arrays (or lists) of data. These correspond to approximately 3000 plots. The plots are time series. My problem is that wh

Solution 1:

You do not need to show a window if you want to save an image of the plot, the following in an example:

import pyqtgraph as pg
import pyqtgraph.exportersplt= pg.plot([1, 2, 3, 4, 5], [2, 5, 2, 5, 2])
exporter = pg.exporters.ImageExporter(plt.plotItem)
exporter.parameters()['width'] = 640
exporter.export('fileName.png')

Although that library has a bug, the solution is simple, you must go to the file pyqtgraph/exporters/ImageExporter.py

pyqtgraph
|
...
├── exporters
│   ├── ...
│   ├── ImageExporter.py
......

and change line 70 of:

bg = np.empty((self.params['width'], self.params['height'], 4), dtype=np.ubyte)

to:

bg = np.empty((int(self.params['width']), int(self.params['height']), 4), dtype=np.ubyte)

fileName.png

References:

• http://www.pyqtgraph.org/documentation/exporting.html

Solution 2:

To close the window that opens by default, you could add plt.win.close() as seen below:

import pyqtgraph as pg
import pyqtgraph.exporters

plt = pg.plot([1, 4, 3, 9, 5], [2, 3, 2, 1, 0])
plt.win.close()
exporter = pg.exporters.ImageExporter(plt.plotItem)
exporter.parameters()['width'] = 640
exporter.export('fileName.png')

References: http://www.pyqtgraph.org/documentation/exporting.html