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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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QwtPlot custom axis

I want to create plot with two horizontal axes. Bottom axis is linear, top axis is non-linear. I have a table of data for conversion "Bottom value -> top value". I found out that QwtScaleEngine provides this functionality. But I can't make it work…
Pavel Strakhov
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Is this method of inter-thread-communication safe?

I have 3 objects(inherited from QObject) that each contain a separate std::list. Each object gets created in the main gui thread (with no parent) and then is pushed to it's own thread (using Qt's QObject::moveToThread()). Each thread is hooked up…
g19fanatic
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updating qwt from 5.2.1 to 6.0.0

I'm trying to update the qwt from 5.2.1 to 6.0.0 version, but when I compile my program, I get a list of errors. please help. and this is the errors list: src/../include/../include/scalepicker.h:7:33: error: qwt_double_interval.h: No such file or…
CHAKRI
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Install Qwt on Win7 64bit

I searched around the web but didn't find a solution for my proper problem. Problem: Qwt-installation failes at the nmake-step What I did: -) installed Qt 5.1 (Qt 5.1.1 for Windows 64-bit (VS 2012, 525 MB)) (Info)from qt-website -) Downloaded Qwt…
Martin
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QWT zoomer plus panner with continuous replot

I have some experience with QWT doing some small test programs, but now I need to make something that is professional. I have a plot where I need to do zooming and panning. I install a zoomer which works great and add a panner, but when I pan the…
Don
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How to show the value label inside a QwtSlider?

I need to draw a slider in Qt which accepts a value of double/float data type, and also display the label value corresponding to the slider value. The default QSlider from Qt can only accept integer data type as the value and it doesn't display the…
all_by_grace
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What is the benefit of having many different data types?

What is the benefit of using many different data types in a language? I have been working with pyqt and pyqwt recently and I keep finding myself typing lines like this: grid.setPen(Qt.QPen(Qt.Qt.gray, 0,…
jminardi
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Why QCustomPlot is too slow in ploting large data?

I want to plotting some large chunk of data (3k) which is coming every 100ms. I tried QCustomPlot and Qwt with exact 3k points and i got really good performances in plotting with Qwt and really bad performances with QCustomPlot. And i think i behave…
Ghasem Ramezani
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How to include qwt in a CMake project?

This question provides a (supposedly) working FindQwt.cmake. Is there an official version of the file somewhere? I would hate to just copy-paste the code. Secondly, here is the content of my debian package. How come it doesn't contain any headers? $…
Vorac
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Qtools and qwt curve plot: how to add points?

I'm trying to create a QT4/qwt5 curve plot using Common Lisp and the Qtools library. Here's a stripped down version of what I got so far: (define-widget main-window (QWidget) ()) (define-subwidget (main-window plot) (q+:make-qwtplot…
NTC
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Can't generate pdf with acceptable output quality using Qt

I'm trying to generate a pdf using Qt5 under Windows. My document contains texts, images and charts. As I'm familiar with Qt and Qwt, I believed the best strategy was to create a QWidget with my document layout and simply print it. But I face…
jpo38
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Using Qt Creator (with Qwt), really basic stuff

I'm trying to make a Qt program using Qt Creator and Qwt for plotting. I've never used Qt Creator before. I've created a MainWindow and added a Qwtplot widget there (object name: qwtPlot). The widget shows up in the program when I compile and run…
Dago
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Error deploying Qt application on OS X

I'm trying to deploy a Qt application on OS X using macdeployqt: macdeployqt MyApplication.app -dmg The application uses the Qwt library, which is being included in the PRO file as follows: macx: QWT_ROOT = /usr/local/qwt-6.1.0 include (…
KelvinS
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QwtPlot - Multiple Y Axis

I use QwtPlot 6.1.3. Is there any way to display multiple curves, sharing a single X axis, but each one with its own Y axis ? I didn't find anything in the documentation, and my Google searchs didn't return anything usefull (just some…
Aurelien
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Using QTime as X asis in QwtPlot

I am trying to draw velocity-time graphics using qwtplot. My X datas are QTime values and Y datas are corresponding speed values. I could not find any example on drawing plots with QTime. Can anyone simply explain how to draw QTime versus Y data ?…
Muhammet Ali Asan
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