CODEWITHSUNDEEP
python-3.xpyqt5pyqtgraph
Jmegan042
Jmegan042

Reputation: 251

Display coordinates in pyqtgraph?

I'm attempting to develop a GUI that allows for tracking mouse coordinates in the PlotWidget, and displaying in a label elsewhere in the main window. I have attempted several times to emulate the crosshair example in the pyqtgraph documentation, but have not been able to get it to agree to do this. A part of the difficulty is that I am unable to understand how to access the mouse tracking I can enable in the QtDesigner.

I attempted to use the:

proxy = pg.SignalProxy(Plotted.scene().sigMouseMoved, rateLimit=60, slot=mouseMoved)
Plotted.scene().sigMouseMoved.connect(mouseMoved)

However, I do not quite understand what allows for this to "update" in real time, nor at what level I should have this statement. Should the 

def mouseMoved(evt):
    pos = evt[0]
    if Plotted.sceneBoundingRect().contains(pos):
       mousePoint = vb.mapSceneToView(pos)
       index = int(mousePoint.x())
       if index > 0 and index < len(x):
          mousecoordinatesdisplay.setText("<span style='font-size: 12pt'>x=%0.1f, <span style='color: red'>y1=%0.1f</span>" % (mousePoint.x(), y[index], data2[index]))
          vLine.setPos(mousePoint.x())
          hLine.setPos(mousePoint.y())

part of the code be in the Ui_MainWindow class, or outside of it?

Upvotes: 0

Views: 4553

Answers (2)

Shrinivas Ganti
Shrinivas Ganti

Reputation: 1

Modified the MouseMoved function to limit the precision of the displayed numbers for my application:

def MouseMoved(self, evt):
    pos = evt
    if self.graphWidget.sceneBoundingRect().contains(pos):
        mousePoint = self.graphWidget.plotItem.vb.mapSceneToView(pos)
        x = float("{0:.3f}".format(mousePoint.x()))
        y = float("{0:.3f}".format(mousePoint.y()))
        self.xylabel.setText(f"Cursor Position: {x, y}")

Upvotes: 0

Jmegan042
Jmegan042

Reputation: 251

I was able to get the updates to work by doing the following:

IN THE setupUi function: 

Plotted = self.plot
vLine = pg.InfiniteLine(angle=90, movable=False)
hLine = pg.InfiniteLine(angle=0, movable=False)
Plotted.addItem(vLine, ignoreBounds=True)
Plotted.addItem(hLine, ignoreBounds=True)
Plotted.setMouseTracking(True)
Plotted.scene().sigMouseMoved.connect(self.mouseMoved)

def mouseMoved(self,evt):
        pos = evt
        if self.plot.sceneBoundingRect().contains(pos):
            mousePoint = self.plot.plotItem.vb.mapSceneToView(pos)
            self.mousecoordinatesdisplay.setText("<span style='font-size: 15pt'>X=%0.1f, <span style='color: black'>Y=%0.1f</span>" % (mousePoint.x(),mousePoint.y()))
        self.plot.plotItem.vLine.setPos(mousePoint.x())
        self.plot.plotItem.hLine.setPos(mousePoint.y()

Where the .mousecoordinatedisplay is a Label. It took me forever to figure out how to do this with use in the GUI from designer. It seems between pyqt4 and pyqt5 there was a change from the Qpointf, where the new Qpointf doesn't allow for indexing. By just passing the evt variable, it is possible to map it without calling the evt[0].

Upvotes: 3

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