Thank you very much for the reply.
I have tried the second method yesterday, but for creating a lots of plots, I
also experienced lag..
Now I have another question that should be the final.
Now plotting all these points, I would like to have two groups, one group with
normal blue points, and a second group with small red points.
The selection is based on the Boolean in the processedMeasurements. For example:
for measurement in processedMeasurements:,
if measurement.accepted == True:
# Then put in group one...
Is there a way to pass the color and the symbol size as array??
Thank you in advance for your time.
Best regards,
Andrea Gotelli.
________________________________
From: [email protected] <[email protected]> on behalf of
Kenneth Lyons <[email protected]>
Sent: Saturday, June 20, 2020 7:32:28 AM
To: pyqtgraph <[email protected]>
Subject: [pyqtgraph] Re: Plotting elements of a class
The plot method expects multiple points in lists or arrays, and you're passing
scalars for the x and y arguments. One thing you could do is extract the
coordinates from all measurements into lists and pass them to plot. For example:
xlist = [m.x for m in processedMeasurements]
ylist = [m.y for m in processedMeasurements]
p1.plot(xlist, ylist, pen=None, symbol='o')
Is there a way to rewrite the exception message that could make it more clear?
By the way, you can plot a single point at a time by wrapping the coordinate
values in lists, e.g. plot([0.], [1.]), but this approach won't scale well as
each plot call generates a separate PlotDataItem.
On Friday, June 19, 2020 at 10:43:55 AM UTC-7, andrea gotelli wrote:
Hi,
I have this problem where i need to plot elements that are stored into an list
containing a UDT.
the class is the following:
class Measurement:
def __init__(self, time, mh_dist, color, x, y):
self.time = float(time)
self.mh_dist = float(mh_dist)
self.color = color
self.x = float( x )
self.y = float( y )
The I create a list containing elements of this class.
processedMeasurements = []
for topic, meas, t in bag.read_messages(topics=['/Measurements']):
if meas.accepted:
processedMeasurements.append( Measurement( t.to_sec(),
meas.distance,
'b',
meas.pose.position.x,
meas.pose.position.y) )
else:
processedMeasurements.append( Measurement( t.to_sec(),
meas.distance,
'r',
meas.pose.position.x,
meas.pose.position.y) )
The only thing that is important to understan here is that I am saving data
readed from a file. Later I would like to plot this data.
For example, the measurements contains a x and y position. I would like to plot
this position for every element in the list processedMeasurements.
However, doing something like:
for measurement in processedMeasurements:
p1.plot(measurement.x, measurement.y, pen=None, symbol='o')
Gives me the following error:
Traceback (most recent call last):
File "/home/agotelli/catkin_ws/src/Project1/plotting/scripts/plotting", line
514, in <module>
p1.plot(measurement.x, measurement.y, pen=None, symbol='o')
File
"/usr/local/lib/python2.7/dist-packages/pyqtgraph/graphicsItems/PlotItem/PlotItem.py",
line 640, in plot
item = PlotDataItem(*args, **kargs)
File
"/usr/local/lib/python2.7/dist-packages/pyqtgraph/graphicsItems/PlotDataItem.py",
line 185, in __init__
self.setData(*args, **kargs)
File
"/usr/local/lib/python2.7/dist-packages/pyqtgraph/graphicsItems/PlotDataItem.py",
line 395, in setData
raise Exception('When passing two unnamed arguments, both must be a list or
array of values. (got %s, %s)' % (str(type(args[0])), str(type(args[1]))))
Exception: When passing two unnamed arguments, both must be a list or array of
values. (got <type 'float'>, <type 'float'>)
Does anybody knows how to solve this problem??
Thank you in advance.
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