Use the slider for time (custom ROI?)

[Simon Hafner]

Hello

I mentioned drawing lines in the other thread, each of those lines describes an event occurring at a specific time. The data slice example mentions a LineSegmentROI, but nothing about a slider. In the examples, I don't see any code generating the sliders, so I assume it works via some additional axis, like in the ImageView. The custom ROI examples are only for in-image selection.

Cheers

[Luke Campagnola]

On Mon, Dec 2, 2013 at 1:43 PM, Simon Hafner <react...@gmail.com> wrote:

I mentioned drawing lines in the other thread, each of those lines describes an event occurring at a specific time. The data slice example mentions a LineSegmentROI, but nothing about a slider. In the examples, I don't see any code generating the sliders, so I assume it works via some additional axis, like in the ImageView. The custom ROI examples are only for in-image selection.

I'm not sure what your question is, but perhaps pg.InfiniteLine or pg.LinearRegionItem provide what you need? Or possibly QtGui.QSlider ?

 

[Simon Hafner]

No, to what I read they don't fit. I want to draw lines, which indicate actions. Each of those lines happens at a specific point in time. I want to the slider so I can say "display all lines between 10 min and 30min" or "all from 5 to 8min".

[Luke Campagnola]

If I understand your purpose, then all three suggestions should work for you. Example:

import pyqtgraph as pg

import numpy as np

pg.mkQApp()

w = pg.GraphicsLayoutWidget()

p1 = w.addPlot()

p2 = w.addPlot(row=1, col=0)

p2.hideAxis('left')

p2.setXRange(0, 10)

p2.vb.setMouseEnabled(False, False)

w.ci.layout.setRowFixedHeight(1, 50)

w.show()

lr = pg.LinearRegionItem([0, 10])

p2.addItem(lr, ignoreBounds=True)

N = 10000

data = np.random.normal(size=(N*2, 2))

data[1::2] = data[::2] + np.random.normal(size=(N,2), scale=0.1)

connect = np.ones(N*2, dtype=np.uint32)

connect[1::2] = 0

curve = pg.PlotCurveItem(x=data[:,0], y=data[:,1], connect=connect)

p1.addItem(curve)

times = np.linspace(0, 10, N)

def update():

    global data, curve, times, lr

    connect = np.ones(N*2, dtype=np.uint32)

    connect[1::2] = 0

    start, stop = lr.getRegion()

    connect[::2][times < start] = 0

    connect[::2][times > stop] = 0

    curve.setData(x=data[:,0], y=data[:,1], connect=connect)

lr.sigRegionChanged.connect(update)

update()

 

[Simon Hafner]

That code segfaults here.

python version 2.7.6, pyqtgraph 0.9.7, qt 4.8.5, Archlinux. 

#0  0x00007ffff51b0154 in QObject::thread() const () from /usr/lib/libQtCore.so.4

#1  0x00007ffff65b62bf in ?? () from /usr/lib/python2.7/site-packages/PyQt4/QtGui.so

#2  0x00007ffff1c1e9e6 in ?? () from /usr/lib/python2.7/site-packages/sip.so

#3  0x00007ffff1c1fbf9 in ?? () from /usr/lib/python2.7/site-packages/sip.so

#4  0x00007ffff7ab51c3 in subtype_dealloc () from /usr/lib/libpython2.7.so.1.0

#5  0x00007ffff7a99cdf in dict_dealloc () from /usr/lib/libpython2.7.so.1.0

#6  0x00007ffff1c1c0e7 in ?? () from /usr/lib/python2.7/site-packages/sip.so

#7  0x00007ffff1c1fb54 in ?? () from /usr/lib/python2.7/site-packages/sip.so

#8  0x00007ffff1c1fc01 in ?? () from /usr/lib/python2.7/site-packages/sip.so

#9  0x00007ffff7ab51c3 in subtype_dealloc () from /usr/lib/libpython2.7.so.1.0

#10 0x00007ffff1c1fb75 in ?? () from /usr/lib/python2.7/site-packages/sip.so

#11 0x00007ffff1c1fc01 in ?? () from /usr/lib/python2.7/site-packages/sip.so

#12 0x00007ffff7ab51c3 in subtype_dealloc () from /usr/lib/libpython2.7.so.1.0

#13 0x00007ffff1c1fb75 in ?? () from /usr/lib/python2.7/site-packages/sip.so

#14 0x00007ffff1c1fc01 in ?? () from /usr/lib/python2.7/site-packages/sip.so

#15 0x00007ffff7ab51c3 in subtype_dealloc () from /usr/lib/libpython2.7.so.1.0

#16 0x00007ffff1c1fb75 in ?? () from /usr/lib/python2.7/site-packages/sip.so

#17 0x00007ffff1c1fc01 in ?? () from /usr/lib/python2.7/site-packages/sip.so

#18 0x00007ffff7ab51c3 in subtype_dealloc () from /usr/lib/libpython2.7.so.1.0

#19 0x00007ffff7a99cdf in dict_dealloc () from /usr/lib/libpython2.7.so.1.0

#20 0x00007ffff1c1c107 in ?? () from /usr/lib/python2.7/site-packages/sip.so

#21 0x00007ffff1c1fb54 in ?? () from /usr/lib/python2.7/site-packages/sip.so

#22 0x00007ffff1c1fc01 in ?? () from /usr/lib/python2.7/site-packages/sip.so

#23 0x00007ffff7ab51c3 in subtype_dealloc () from /usr/lib/libpython2.7.so.1.0

#24 0x00007ffff7a98e4f in insertdict_by_entry () from /usr/lib/libpython2.7.so.1.0

#25 0x00007ffff7a9a7b0 in dict_set_item_by_hash_or_entry () from /usr/lib/libpython2.7.so.1.0

#26 0x00007ffff7a9ef6c in _PyModule_Clear () from /usr/lib/libpython2.7.so.1.0

#27 0x00007ffff7b0989d in PyImport_Cleanup () from /usr/lib/libpython2.7.so.1.0

#28 0x00007ffff7b14b6e in Py_Finalize () from /usr/lib/libpython2.7.so.1.0

#29 0x00007ffff7b256d5 in Py_Main () from /usr/lib/libpython2.7.so.1.0

#30 0x00007ffff7474bc5 in __libc_start_main () from /usr/lib/libc.so.6

#31 0x0000000000400741 in _start ()

 

[Luke Campagnola]

Sorry, either run it from a python interactive prompt or add `pg.QtGui.QApplication.exec_()` to the end.

 

[Simon Hafner]

Am Montag, 2. Dezember 2013 19:05:07 UTC-6 schrieb Luke Campagnola:

Sorry, either run it from a python interactive prompt or add `pg.QtGui.QApplication.exec_()` to the end.

Thanks.

I played around with the slider, but the data displayed does not seem to change. I see how this should work, but apparently it doesn't that well. It mentions to use arrays of boolean values, are 0/1 fine there?

[Simon Hafner]

The connect doesn't seem to work at all, when I set it to "pairs" there are still connected lines. 

[Simon Hafner]

Am Montag, 2. Dezember 2013 20:20:06 UTC-6 schrieb Simon Hafner:

Am Montag, 2. Dezember 2013 19:53:42 UTC-6 schrieb Simon Hafner:

Am Montag, 2. Dezember 2013 19:05:07 UTC-6 schrieb Luke Campagnola:0

Sorry, either run it from a python interactive prompt or add `pg.QtGui.QApplication.exec_()` to the end.

Thanks.

I played around with the slider, but the data displayed does not seem to change. I see how this should work, but apparently it doesn't that well. It mentions to use arrays of boolean values, are 0/1 fine there?

The connect doesn't seem to work at all, when I set it to "pairs" there are still connected lines. 

Solved by updating to 0.9.8. 

[Simon Hafner]

In the Slider, how do I display the graph like in ImageView? 

[Luke Campagnola]

Call p2.plot(x, y) or create a PlotCurveItem manually, exactly as done with p1.