[pyqtgraph] Re: linearregionitems in log plots are returning unexpected values
I face the same problem all the time because I also work with logarithmically spaced frequency axis but we can easily work around it by testing whether log(x) is being used or not: log_state = my_plot.plotItem.ctrl.logXCheck.isChecked() [x,y] = my_curve.getData() if (log_state): x = 10**x -- 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 pyqtgraph+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/pyqtgraph/6801a709-1c16-4736-92bf-0f408229d6dc%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
[pyqtgraph] Re: log(x) axis with negative powers of ten
so it turned out the log(x) display was somehow corrupted by my xRange(xMin,xMax) values. My x values range from 0 to 1e7. My actual data ranges from 1e-3 to 1e7. I previously set xRange(1e-9 to 1e7) to avoid log(0) @xMin. In this setup I am no longer getting nicely logarithmically spaced vertical lines, 1e^n whhere n<0 are not displayed. But I then modified xRange to (-100,1e7) and now I am getting proper vertical lines. So xRange(-100,1e7) is a solution to get proper vertical lines, but the overall UI is no longer super nice because my values never reach x<0, and the user can actually scroll down to -100(whatever xMin value I set) don't know what's happening with axisItems or the related class -- 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 pyqtgraph+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/pyqtgraph/cf40d399-37da-46dc-af85-9080a9fbf229%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
[pyqtgraph] log(x) axis with negative powers of ten
Hi, I'm building an application where I need to monitor frequency domain data and we use the log(x) feature all the time. My x (frequency) axis ranges from 1e6 (MHz) down to 1e-3 (mHz) and it seems like pyqtgraph is not capable of dealing with 1e^n as long as N<0, by "not dealing", I mean I am no longer getting proper ticks, lines are not displayed and displaying is messed up (dHz & mHz are not even displayed). Is there a way I can work around this by creating a custom axis item? I always build PyQtGraph from the "master" branch which is fairly outdated, should I switch to "develop"? -- 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 pyqtgraph+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/pyqtgraph/68de1057-e292-408a-a47d-919208157db6%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
[pyqtgraph] Override 'writeCsv' of PlotItem class
Hello,
I think what I am trying to do should be doable,
I would like to override the export to csv feature of a PlotWidget that I
usally build this way:
self.main_plot = pg.PlotWidget(name="main_plot")
self.main_plot.seLogMode..
self.main_plot.showGrid..
because I would like the new function to only write the content of curves
objects (plotDataItems) that do not have a specific name,
here's how I usually build my curves objects:
self.curve = self.main_plot.plot(pen=color)
So I looked into the library code, and if I got it right, I need to create
a custom PlotItem class with proper inheritance, because I do not want to
break any functionality, so far I wrote something like this:
class CustomPlotItem(pg.PlotItem):
# use very same arguments
def __init__(self, parent=None, name=None, labels=None, title=None,
viewBox=None, axisItems=None, enableMenu=True, **kargs):
# pass all arguments to super so I do not break anything
super(customPlotItem, self).__init__(parent=parent, name=name, )
# use very same name to override
def writeCsv(self, fileName=None):
# >> previous code
if fileName is None:
self.fileDialog = FileDialog()
if PlotItem.lastFileDir is not None:
self.fileDialog.setDirectory(PlotItem.lastFileDir)
self.fileDialog.setFileMode(QtGui.QFileDialog.AnyFile)
self.fileDialog.setAcceptMode(QtGui.QFileDialog.AcceptSave)
self.fileDialog.show()
self.fileDialog.fileSelected.connect(self.writeCsv)
return
# new functionality
fileName = str(fileName)
PlotItem.lastFileDir = os.path.dirname(fileName)
fd = open(fileName, 'w')
data = [c.getData() for c in self.curves]
data = []
for c in self.curves:
if (c.name() != "name_to_drop_out"):
data.append(c.getData())
# previous code
i = 0
while True:
done = True
for d in data:
if i < len(d[0]):
fd.write('%g,%g,'%(d[0][i], d[1][i]))
done = False
else:
fd.write(' , ,')
fd.write('\n')
if done:
break
i += 1
fd.close()
so my problem is, I am using a pg.PlotWidget in my code, how can I make
this pg.PlotWidget not to build a usual pg.PlotItem but a custom one?
I tried something dirty so far:
self.main_plot = pg.PlotWidget(name="test")
customClass = CustomPlotItem() # could use some args?
self.main_plot.plotItem = customClass # kill default pointer,
point to custom stuff
self.curve = self.main_plot.plot() # try to use it
I guess you guys get the idea,
- Is this the right approach, do I got the class tree right?
- since the functionality I want to override is located in plotItem, How
do I get my plotWidget class (which is eventually what I use) to actually
use it?
- note: I might be wrong & the functionality writeCsv might be located
somewhere else
>> Just want to acknowledge how cool and impressive PyQtGraph is, I have
been using it for years now, and it's just flawless. Keep up the good work
guys
thank you
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