Dear All,
I am developing an application in which graphs are embedded in a PyQt
arrangement of Buttons, Widgets and the like, and am therefore using the
PlotWidget method. Mostly it is working fine, but when I encounter data
with a large range, more than about 10^12 I think, then my TextItems
disappear. I attach a demonstration script based on the PlotWidget.py
example. I am using PyQtgraph 0.10.0 with Python 3.6
Any suggestions gratefully received!
Geof
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from pyqtgraph.Qt import QtGui, QtCore
import numpy as np
import pyqtgraph as pg
app = QtGui.QApplication([])
mw = QtGui.QMainWindow()
mw.setWindowTitle('pyqtgraph example: PlotWidget')
mw.resize(800,400)
cw = QtGui.QWidget()
mw.setCentralWidget(cw)
l = QtGui.QVBoxLayout()
cw.setLayout(l)
pw = pg.PlotWidget()
l.addWidget(pw)
mw.show()
p1 = pw.plot()
pw.setXRange(0, 2)
# if YRANGE=1e10 then the TextItem is visible, but if YRANGE=1e20 it isn't
# YRANGE=1e10
YRANGE=1e20
def rand(n):
data = np.random.random(n)
data *= YRANGE
return data, np.arange(n, n+len(data)) / float(n)
yd, xd = rand(1000)
p1.setData(y=yd, x=xd)
text = pg.TextItem("Hello")
pw.addItem(text)
text.setPos(0.5, 0.5*YRANGE)
app.exec_()
