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Questions tagged [qwt]

a collection of QT widgets, GUI components and utility classes.

Qwt or Qt Widgets for Technical Applications is a library of custom widgets, GUI components and utility classes which are written in C++ language and primarily useful for programs with a technical background. The library provides a 2D plot widget in addition to scales, sliders, dials, compasses, thermometers, wheels and knobs to control or display values, arrays, or ranges.

This library is intended mainly for usage in scientific or technical applications. It works well with large number of points.

The Qwt user's guide may be found at https://qwt.sourceforge.io/.

Qwt is distributed under the terms of Qwt license which is basically is LGPL and may be found here: https://qwt.sourceforge.io/qwtlicense.html

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Knob Widget (or alternative) in PyQtGraph

I'd like to port Eli Bendersky's application written for PyQwt over to PyQtGraph... doing this mostly to learn and because it's unclear if Qwt or PyQwt is actively maintained (trying to avoid potential issues getting it to work with my PyQt5 /…
ben
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Set Tooltip to QwtPlotCurve

I am plotting a QwtPlotCurve like this : QwtPlotCurve *qpc = new QwtPlotCurve(); qpc->setSamples( QVector::fromStdVector(x[i]), QVector::fromStdVector(y[i])); And then i attach this to a QwtPlot. I need to set a Tooltip to each…
igoutas
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qt qgraphicsWidget registered as qml type and plotting graph, but graph is not working smooth when after adding any animation

first image shows correct (smooth) plotting graph. but when i add any animation like color change, opacity change or text change, graph fails. as you can see in second picture right of graph disappeared... plot object inherited from…
mcan
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How do I wait until QWidget::repaint is finished?

I have a gui with a QWidget (specifically, a QwtPlot but I don't think the problem is Qwt-specific) which I redraw using a timer. I.e., every 100ms QWidget::update gets called, via QwtPlot::replot. When the timer interval too small, or the number…
Matt Phillips
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Error while installing QWT library

I m trying to install QWT library,I m using QT 5.2 on Ubuntu Operating System.I have used the following commands. svn checkout svn://svn.code.sf.net/p/qwt/code/branches/qwt-6.1 qmake qwt.pro make -j4 While I use the make -j4 command I get the…
user3520466
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Plot Spectrum in real time?

I would like to add and plot the spectrum of signal on Qwt Oscillocope's example. My Idea is to create another seriesData class. SerieData. I wonder if there will not conflict between sample of SeriesData and sample of Signaldata or I just need to…
The Man
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Expected type-specifier before 'QwtLog10ScaleEngine'?

Version: qwt 6.0.1 I've tried to develop logarithmic scaling for Spectrum. I've used simple line to enable scaling plotspectrum->setAxisScaleEngine(QwtPlot::yLeft, new QwtLog10ScaleEngine); Problems: the data are not drawn, so the plot is empty and…
The Man
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qwt build - qmake build (Qt 5.3)

I want to compile the qwt library using qt 5.3. Previously I had older versions of Qt. So, when I call the Qt 5.3.0 32-bit for Desktop (MSVC 2012 OpenGL) shell and move to the directory, which contains qwt (C:\qwt-6.1.0), then perform qmake qwt.pro…
artsin
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PyQt and QwtPlot - how to change ticks direction?

I have a Qt Designer file with QwtPlot widget. Question: how to change Ticks direction with python code? QwtPlot widget is accessible by self.ui.qwtPlot1 code line. Below a picture is with view of axis - how to make qwtPlot axis look like…
user2215964
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How to specify symbol position on the marker?

I am using Qwt library. I have added vertical QwtPlotMarker on the plot. I want to add QwtSymbol to my marker and I want the symbol to be in the bottom of the marker. When I use setSymbol() it places symbol in the middle of the marker. There are…
lnk
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Slow replot of a Qwt graph in embedded linux

I'm facing some problems while developing an Qt-based embedded solution for Linux. Basically my application plots a QwtPlot graph with up to 8 QwtPlotCurves attached to it. A QwtPlot::replot() is called each 1 second. Data arrives from a socket…
Momergil
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Replotting graph based on ROS subscribed data

Architecture I have a plot. And a curve in that plot. I have a node in the file and a subscriber. This subscriber subscribes to some float data, that is being published. Every time some data is published, I update the curve by adding the new…
IcyFlame
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How to rotate markers in qwt

I want to rotate my marker in my plot but i cant. Here is my code to adding images to plot: QPixmap pixmap("myImage"); QwtSymbol *symbol = new QwtSymbol; symbol->setPixmap(pixmap); marker = new QwtPlotMarker; …
alperyazir
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qwt- how to customize the scale numbers shown in a QwtKnob

As said in the question I'm trying to change the numbers shown in the scale part of a QwtKnob. This is exactly the situation: I have this knob with the values between 1 to 100. Now when I set its range to between 1 and 100 with the step of 1 its…
Vahid Nateghi
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How to attach png files to qwtplot

Is it possible to use png files in QwtPlot? Normally i can use svg files in my plots with QwtPlotSvgitem class but i could not succeed with these png files. Please give me a clue about that. Regards
alperyazir
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