I suffer from zooming the plot in real time.
This plot draw random function in real time.
Problem is not shown right the 2nd plot zoomed.
It must be something I have done wrong.
Or is it possible to zoom the plot in real time?
I will appreciate to help me.
Used example code is "plotting.py".
# -*- coding: utf-8 -*-
import pyqtgraph as pgfrom pyqtgraph.Qt import QtCore, QtGuiimport numpy as np
win = pg.GraphicsWindow()
win.setWindowTitle('Scroll and Zoomed Plot')
plotScroll = win.addPlot()
plotScroll.setDownsampling(mode='peak')
plotScroll.setClipToView(True)
curveScroll = plotScroll.plot()
dataRnd = np.empty(100)
ptrDataRnd = 0
def updateScroll():
global dataRnd, ptrDataRnd
dataRnd[ptrDataRnd] = np.random.normal()
ptrDataRnd += 1
if ptrDataRnd >= dataRnd.shape[0]:
tmp = dataRnd
dataRnd = np.empty(dataRnd.shape[0] * 2)
dataRnd[:tmp.shape[0]] = tmp
curveScroll.setData(dataRnd[:ptrDataRnd])
LinRegionItem = pg.LinearRegionItem([0,100])LinRegionItem.setZValue(-10)
plotScroll.addItem(LinRegionItem)
win.nextRow()
plotZoom = win.addPlot(title="Zoomed graph for Random plot ")
plotZoom.plot(dataRnd, pen=(255,255,255,200))
def updatePlot():
plotZoom.setXRange(*LinRegionItem.getRegion(), padding=0)def updateRegion():
LinRegionItem.setRegion(plotZoom.getViewBox().viewRange()[0])LinRegionItem.sigRegionChanged.connect(updatePlot)
plotZoom.sigXRangeChanged.connect(updateRegion)
updatePlot()
# update all plotsdef update():
updateScroll()
timer = pg.QtCore.QTimer()
timer.timeout.connect(update)
timer.start(50)
## 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_()
--
You received this message because you are subscribed to the Google Groups
"pyqtgraph" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to [email protected].
To view this discussion on the web visit
https://groups.google.com/d/msgid/pyqtgraph/387d5df2-d712-4d4d-a990-3086da14a7a9%40googlegroups.com.
For more options, visit https://groups.google.com/d/optout.
