:orphan:

qtgrtimer
---------


Plotting two-dimensional live data using QtGR.


.. code-block:: python
    
    
    
    # standard library
    import sys
    # third party
    import numpy as np
    # local library
    from gr.pygr import Plot, PlotAxes, PlotCurve
    from qtgr.backend import QtCore, QtWidgets
    from qtgr import InteractiveGRWidget
    
    __author__ = "Christian Felder <c.felder@fz-juelich.de>"
    __copyright__ = """Copyright (c) 2012-2015: Josef Heinen, Florian Rhiem,
    Christian Felder and other contributors:
    
    http://gr-framework.org/credits.html
    
    Permission is hereby granted, free of charge, to any person obtaining
    a copy of this software and associated documentation files (the
    "Software"), to deal in the Software without restriction, including
    without limitation the rights to use, copy, modify, merge, publish,
    distribute, sublicense, and/or sell copies of the Software, and to
    permit persons to whom the Software is furnished to do so, subject to
    the following conditions:
    
    The above copyright notice and this permission notice shall be
    included in all copies or substantial portions of the Software.
    
    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
    EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
    MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
    NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
    LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
    OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
    WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
    
    The GR framework can be built with plugins that use code from the
    following projects, which have their own licenses:
    
    - MuPDF - a lightweight PDF and XPS viewer (AFPL)
    - Ghostscript - an interpreter for the PostScript language and for PDF (AFPL)
    - FFmpeg - a multimedia framework (LGPL / GPLv2)
    
    """
    
    
    class ScaledPlotAxes(PlotAxes):
    
        def doAutoScale(self, curvechanged=None):
            xmin, xmax, ymin, ymax = PlotAxes.doAutoScale(self, curvechanged)
            bxmin, _bxmax, _bymin, _bymax = self.getBoundingBox()
            if xmin < bxmin:
                xmin = bxmin
            self.setWindow(xmin, xmax, ymin, ymax)
            return self.getWindow()
    
    
    class MainWindow(QtWidgets.QMainWindow):
    
        def __init__(self, *args, **kwargs):
            QtWidgets.QMainWindow.__init__(self, *args, **kwargs)
            self._grw = InteractiveGRWidget()
            self.setCentralWidget(self._grw)
    
            viewport = [0.1, 0.88, 0.1, 0.88]
            x = np.arange(0, 2 * np.pi, 0.01)
            y = np.sin(x)
    
            self.curve = PlotCurve(x, y)
            axes = ScaledPlotAxes(viewport)
            axes.addCurves(self.curve)
            plot = Plot(viewport).addAxes(axes)
            plot.title = "QtGR Timer example"
            plot.subTitle = "Plotting Live-Data"
            plot.xlabel = "t"
            plot.ylabel = "sin(t)"
            plot.autoscale = PlotAxes.SCALE_X | PlotAxes.SCALE_Y
            self._grw.addPlot(plot)
    
            timer = QtCore.QTimer(self)
            timer.timeout.connect(self.updateData)
            timer.start(40)
    
        def updateData(self):
            self.curve.x += 0.05
            self.curve.y = np.sin(self.curve.x)
            self.update()
    
    
    def main(*args):
        app = QtWidgets.QApplication(sys.argv)
        mainWin = MainWindow()
        mainWin.resize(QtCore.QSize(500, 500))
        mainWin.show()
        sys.exit(app.exec_())
    
    
    if __name__ == "__main__":
        main(sys.argv)