Qt plotting widgets for Python
Project description
The PythonQwt package is a 2D-data plotting library using Qt graphical user interfaces for the Python programming language. It is compatible with both PyQt4, PyQt5 and PySide2 (see documentation for more information on a performance issue due to PySide2 itself when plotting huge data sets).
The PythonQwt project was initiated to solve -at least temporarily- the obsolescence issue of PyQwt (the Python-Qwt C++ bindings library) which is no longer maintained. The idea was to translate the original Qwt C++ code to Python and then to optimize some parts of the code by writing new modules based on NumPy and other libraries.
The PythonQwt package consists of a single Python package named qwt which is a pure Python implementation of Qwt C++ library with some limitations: efforts were concentrated on basic plotting features, leaving higher level features to the guiqwt library.
See README and documentation (online or PDF) for more details on the library and changelog for recent history of changes.
The following example is a good starting point to see how to set up a simple plot widget:
from qtpy import QtWidgets as QW
import qwt
import numpy as np
app = QW.QApplication([])
x = np.linspace(-10, 10, 500)
plot = qwt.QwtPlot("Trigonometric functions")
plot.insertLegend(qwt.QwtLegend(), qwt.QwtPlot.BottomLegend)
qwt.QwtPlotCurve.make(x, np.cos(x), "Cosinus", plot, linecolor="red", antialiased=True)
qwt.QwtPlotCurve.make(x, np.sin(x), "Sinus", plot, linecolor="blue", antialiased=True)
plot.resize(600, 300)
plot.show()
app.exec_()
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