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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

373 questions
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How can I clear a QwtPlot on Qt?

In my QwtPlot object I have some curves plotted and a QwtPlotPicker (derived from the curvetracker class from the Qwt playground). How can I clear it all? I need to remove the curves, hide the axes and remove the QwtPlotPicker. I can remove the…
KelvinS
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Can't install qwt designer plugin on mac

I am unable to install qwt designer plugin on my Mac. I have downloaded v 6.1.3, and successfully did qmake, make and sudo make install. The problem is that under /usr/local/qwt-6.1.3/lib I have only the file qwt.framework, and not something like…
Ran Levy
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Qwt rescale axis

I have a QwtPlot that I wish to alter the axis scale without having to change the value of the points drawn themselves. In my application I plot points in Volts, inside a [-10,10] V range (both axes). I'd like to calibrate each axis by multiplying…
A. Vieira
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QwtPlotSpectrogram doesn't work (no ImageMode plot)

I'm trying to create a simple colored "spectrogram" style plot of some (x,y,value) data, using the QwtPlotSpectogram library. The source data is an array of doubles. I don't need contour lines, just a grid of colored pixels representing the value at…
Jeremy
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QT_STATIC_CONST does not name a type

I was using QT5.4.1 version with the QWT-6.1.2 library that I've installed but in compiling I receive the error "QT_STATIC_CONST does not name a type". After some researsh how to fix that, I found that I should install the QT version 5.5. I have…
Tova
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Qt binary linked to both Qt 5 and (wrongly) to Qt 4 causing segmentation fault when linked to Qwt

I have a Qt / ROS / Qwt application. Everything was going fine until I tried to link to Qwt. Note that I'm using Qwt 6.1.2 which should run on Qt 5.5. Indeed, the examples run fine. When I run my binary, it crashes even if I'm not using Qwt. I just…
cauchi
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Does Qt5 break QwtPlotRenderer postscript support?

I'm trying to use QwtPlotRenderer to save an image of a QwtPlot as a postscript file. This appears supported in the documentation, however whenever I render with the ".ps" extension, nothing happens. After some research, it appears that Qt5 removed…
Nicolas Holthaus
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error with qwt: QWidget: Must construct a QApplication before a QPaintDevice

Good evening, system: mac OSX 10.10.1 Qt 5.3.2 (via homebrew) qwt 6.1.1 (via homebrew) Qt Creator 3.2.1 I have used this tutorial http://codingexodus.blogspot.de/2013/01/getting-started-with-qwt.html and this one…
RogerWilco77
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Customizing QwtPlot's scale and grid lines

I'm confused with using QwtPlot class to draw a customized coordinate system. My goal is to draw a coordinate system with customized scale, and draw grid line on these customized scales. Here are the values of the scales: x-axis and y-axis…
OrionNebular
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Qwt framework not found

Good Morning, I am currently trying to build a project in QT that uses the Qwt library. However, when I try to build the project I get warning: directory not found for option '-F/usr/local/qwt-6.1.0/lib' error:framework not found qwt error:linker…
JBarry465
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How do I change the cursor used when the mouse pointer is over a QwtPlot?

By default, the cursor changes to a crosshair when it’s within a QwtPlot on the screen. Calling setCursor(Qt::ArrowCursor); from within my QwtPlot subclass doesn’t have any effect. How can I change this cursor to something other than a crosshair?
bdesham
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Using logarithmic and linear axis scale together

I am using qwt 6.1.0. I tried: linEngine = new QwtLinearScaleEngine; logEngine = new QwtLogScaleEngine; these codes to make my axis logarithmic and linear. But I want to use them together for example; 1 - 10 ---> in this interval must be …
alperyazir
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QwtPolar: Space between canvas and legend

Does anyone know how to avoid this space between the canvas and the legend? I couldn't find where and how the legend is added to layout in QwtPolar sources. May be anyone here knows how it works?
Akdez
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qt creator does not see the qwt headers

I have installed qwt as it explained here. The problem is that compiler can not find qwt headers. When I type #include in mainwindow.cpp file, compiler gives an error: qwt_plot.h:No such file or directory.
lnk
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Qwt axis don't displayed properly

Qt version: 5.2.1 Qwt version: 6.1.0 Application: tvplot example (bug is the same for all other examples with graphs and axis) Host platform: x64 Target platform: arm-linux-gnueabi Problem: please take a look to attached picture - both axis don't…
Konstantin Utkin
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