On Fri, May 2, 2014 at 8:49 AM, Marcus Müller <marcus.muel...@ettus.com>wrote:
> Hi Activecat, > > typical GUI problem; background is that X applications are inherently hard > to multithread, which basically requires graphical toolkits to run in a > main loop. This conflicts with every block being run in its own thread. > > The easiest solution nowadays should be that you generate a QT flow graph > in GRC, use PyQT to generate your GUI, register a message handler and > integrate matplotlib (there are examples out there, just don't have one at > my fingertips right now), and use the message passing interface to get data > out of your flow graph into your GUI. > > Greetings, > Marcus > Tim's written a number of blocks like this: https://github.com/osh/gr-pyqt Tom > On Fri, May 2, 2014 at 2:17 PM, Activecat <active...@gmail.com> wrote: > >> Gurus, >> >> I try to transfer an image file via a pair of USRPs. >> At the receiver side, the data is fed into a custom block, where it plots >> the image in realtime using matplotlib's pyplot.imshow(). >> Unfortunately, in the work() function, the pyplot.draw() causes below >> runtime error. >> >> handler caught exception: main thread is not in main loop >> Traceback (most recent call last): >> File "/usr/local/lib/python2.7/dist-packages/gnuradio/gr/gateway.py", >> line 55, in eval >> try: self._callback() >> File "/usr/local/lib/python2.7/dist-packages/gnuradio/gr/gateway.py", >> line 160, in __gr_block_handle >> ) for i in self.__out_indexes], >> File "/usr/local/lib/python2.7/dist-packages/activecat/image_sink1.py", >> line 72, in work >> self.axes1.figure.canvas.draw() #pyplot.draw() >> File >> "/usr/lib/pymodules/python2.7/matplotlib/backends/backend_tkagg.py", line >> 349, in draw >> tkagg.blit(self._tkphoto, self.renderer._renderer, colormode=2) >> File "/usr/lib/pymodules/python2.7/matplotlib/backends/tkagg.py", line >> 13, in blit >> tk.call("PyAggImagePhoto", photoimage, id(aggimage), colormode, >> id(bbox_array)) >> RuntimeError: main thread is not in main loop >> thread[thread-per-block[1]: <block image_sink1 (2)>]: caught unrecognized >> exception >> >> >> The custom block (perform plotting) is written in Python, as below: >> >> #!/usr/bin/env python >> # -*- coding: utf-8 -*- >> >> import numpy >> from gnuradio import gr >> from matplotlib import image, pyplot >> >> class image_sink1(gr.sync_block): >> >> def __init__(self): >> gr.sync_block.__init__( self, name="image_sink1", >> in_sig=[ numpy.complex64 ], >> out_sig=None) >> >> pyplot.figure() >> pyplot.ion() >> pyplot.show() >> >> self.axes1 = pyplot.gca() >> #self.win = self.axes1.figure.canvas.manager.window >> #self.win.after(100,animate) >> >> self.completed = False >> self.img2 = numpy.zeros( (150,150,4), numpy.uint8 ) >> >> self.coordinate = self.coordinate_stream() >> >> >> def coordinate_stream(self): >> for y in range(150): >> for x in range( 0, 150, 2 ): >> yield y,x >> >> def work(self, input_items, output_items): >> in0 = input_items[0] >> >> if self.completed: >> return -1 >> >> for sample1 in in0: >> try: >> y,x = next( self.coordinate ) >> >> if sample1.real > 0: >> self.img2[y,x] = numpy.array([255,255,255,255]) >> else: >> self.img2[y,x] = numpy.array([0,0,0,255]) >> >> if sample1.imag > 0: >> self.img2[y,x+1] = numpy.array([255,255,255,255]) >> else: >> self.img2[y,x+1] = numpy.array([0,0,0,255]) >> >> except StopIteration: >> print "Receiver side completed!" >> self.complete = True >> >> self.axes1.imshow( self.img2 ) >> >> self.axes1.figure.canvas.draw() # or, pyplot.draw(), both gives >> error !!! >> >> return in0.size >> >> >> Please advise, >> thanks in advance. >> >> >> >> _______________________________________________ >> Discuss-gnuradio mailing list >> Discuss-gnuradio@gnu.org >> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >> >> > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > >
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