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iraf-community / pyraf

Command language for IRAF based on Python.
https://iraf-community.github.io/pyraf.html
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Impossible to call splot in interactive mode from a Qt5 GUI application #153

Open noste99 opened 1 year ago

noste99 commented 1 year ago

When calling the IRAF command iraf.onedspec.splot(filename) inside a python function (making use of subprocess.run) linked to a Qt5 button on the GUI, a window opens with title graphics1 but it remains black and the following traceback info is printed:

`Traceback (most recent call last): File "/archive/stefan/ARCHIVE/ePython/EC_PIPELINE/EC_Envelopes.py", line 117, in triggeredImageView pb.viewImage(self.lbl_val_SCIE.text()) File "/archive/stefan/ARCHIVE/ePython/EC_PIPELINE/pipe_Blocks.py", line 83, in viewImage cmd = iraf.onedspec.splot(imname) File "/usr/lib/python3/dist-packages/pyraf/iraftask.py", line 836, in call return self.run(args, kw) File "/usr/lib/python3/dist-packages/pyraf/iraftask.py", line 375, in run self._run(redirKW, specialKW) File "/usr/lib/python3/dist-packages/pyraf/iraftask.py", line 880, in _run irafexecute.IrafExecute(self, iraf.getVarDict(), redirKW) File "/usr/lib/python3/dist-packages/pyraf/irafexecute.py", line 348, in IrafExecute irafprocess.run(task, pstdin=stdin, pstdout=stdout, pstderr=stderr) File "/usr/lib/python3/dist-packages/pyraf/irafexecute.py", line 512, in run self.slave() File "/usr/lib/python3/dist-packages/pyraf/irafexecute.py", line 644, in slave xmit() File "/usr/lib/python3/dist-packages/pyraf/irafexecute.py", line 827, in xmit gki.kernel.append(numpy.frombuffer(xdata, dtype=numpy.int16)) File "/usr/lib/python3/dist-packages/pyraf/gki.py", line 901, in append self.stdgraph.append(arg, isUndoable) File "/usr/lib/python3/dist-packages/pyraf/gki.py", line 901, in append self.stdgraph.append(arg, isUndoable) File "/usr/lib/python3/dist-packages/pyraf/gki.py", line 561, in append self.translate(buffer, 0) File "/usr/lib/python3/dist-packages/pyraf/gkitkbase.py", line 822, in translate self.incrPlot() # pure virtual, must be overridden File "/usr/lib/python3/dist-packages/pyraf/gkitkplot.py", line 125, in incrPlot function(args) File "/usr/lib/python3/dist-packages/pyraf/gkitkplot.py", line 302, in tkplot_polyline gw.create_line(*(tuple(scaled.ravel().astype(numpy.int32))), **options) File "/usr/lib/python3.10/tkinter/init.py", line 2823, in create_line return self._create('line', args, kw) File "/usr/lib/python3.10/tkinter/init.py", line 2805, in _create return self.tk.getint(self.tk.call( _tkinter.TclError: bad screen distance "2.0"

` All other iraf commands work fine in my application. I refer here to splot because it is rather simple to use, but the objective of my application is to pass manually through the different steps of the calibration of an ECHELLE spectrum. What blocks me is apall running in an interactive mode and due to the fact this seems incompatible with Qt5 I am blocked. Thanks in advance for your advice.

noste99 commented 11 months ago

For the time being the workaround I found was based on the use of a subprocess. The python function I wrote setting first the splot parameters and then launches the splot task is now saved in a self-standing .py script. The latter is launched by clicking a button in a Qt5 GUI using the command: subprocess.run(["python3.10", "splot_sub.py"]). The splot command first asks whether the Image line/aperture to be plotted is the one set in the line parameter. When confirmed, a typical IRAF interactive graphics window opens outside the Qt5 application. The latter waits until the work in the graphics window is finished by typing "q". Once that happened, the Qt5 application takes control again. It would of course be nice to integrate the IRAF graphics window in the Qt5 application window but for the time being the workaround is fine.