I am trying to make a cross hair on my pyqtgraph interactive plots, which
are embedded in a PyQt5 GUI thanks to the designer-qt5. I found a working
code in the pyqtgraph "examples". A simplified WORKING example is posted
below. Now I want the same, but the problem seems to be that I promoted a
QGraphicsView() to a pg.PlotWidget in the designer, instead of
pg.GraphicsWindow()? The Code does not work for me because my p1 is
"pyqtgraph.widgets.PlotWidget.PlotWidget object" while in the example p1 is
"pyqtgraph.graphicsItems.PlotItem.PlotItem.PlotItem object".
So what should I do to make this example work for me?
> import numpy as np
> import pyqtgraph as pg
> from pyqtgraph.Qt import QtGui, QtCore
> from pyqtgraph.Point import Point
>
> pg.setConfigOption('background', '#ffffff')
> pg.setConfigOption('foreground', 'k')
> pg.setConfigOptions(antialias=True)
>
> app = QtGui.QApplication([])
> win = pg.GraphicsWindow()
> win.setWindowTitle('pyqtgraph example: crosshair')
> label = pg.LabelItem(justify='right')
> win.addItem(label)
> p1 = win.addPlot(row=1, col=0)
>
> p1.setAutoVisible(y=True)
>
> #create numpy arrays
> #make the numbers large to show that the xrange shows data from 10000 to all
> the way 0
> data1 = 10000 + 15000 * pg.gaussianFilter(np.random.random(size=10000), 10) +
> 3000 * np.random.random(size=10000)
>
> p1.plot(data1, pen="r")
>
> #cross hair
> vLine = pg.InfiniteLine(angle=90, movable=False)
> hLine = pg.InfiniteLine(angle=0, movable=False)
> p1.addItem(vLine, ignoreBounds=True)
> p1.addItem(hLine, ignoreBounds=True)
>
> vb = p1.vb
>
> print(p1)
> print(vb)
>
> def mouseMoved(evt):
> pos = evt[0] ## using signal proxy turns original arguments into a tuple
> if p1.sceneBoundingRect().contains(pos):
> mousePoint = vb.mapSceneToView(pos)
> index = int(mousePoint.x())
> if index > 0 and index < len(data1):
> label.setText("<span style='font-size: 12pt'>x=%0.1f, <span
> style='color: green'>y2=%0.1f</span>" % (mousePoint.x(), data1[index]))
> vLine.setPos(mousePoint.x())
> hLine.setPos(mousePoint.y())
>
> proxy = pg.SignalProxy(p1.scene().sigMouseMoved, rateLimit=60,
> slot=mouseMoved)
> #p1.scene().sigMouseMoved.connect(mouseMoved)
>
> ## Start Qt event loop unless running in interactive mode or using pyside.
> if __name__ == '__main__':
> import sys
> if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
> QtGui.QApplication.instance().exec_()
>
>
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