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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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qwt: plot 1-dimensional array?

What is the most simple way to plot a 1-dimensional array like that: double ad_data[64]; int i; for(i=0; i<64; i++) { ad_data[i] = sin( 1.0/16 * i * 3.1415 ); } in qwt?
Benjamin
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Qt additonal library for plot dial ,bars and other objects?

I want to put some good looking objects on my application like plots, dials and other objects. QCustomPlot is available and I think that will be okay for plots but objects available in QWT are very old looking, I want some objects which adds some…
V. Purbia
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Qt oscilloscope example

I was told there is a qt oscilloscope example available online, not sure if it's by Qt QDevelop or someone else. Can someone give me a link to this project? I need this to test something I am working on in Qt. I need to generate some data,…
DemiSheep
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Qwt replot only a specific area

I have a QwtPlot view containing many QwtPlotCurve and I want to highlight/mignify (currently simply trying to change the color) of the closest point to the mouse position (because I'll display some info about this point of measurement when user…
jpo38
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Get last n elements from QPolygonF

I have a std::map< QString, QPolygonF> that contains three QStrings (sensorId) and for each sensor some data as QVector< QPointF>, which are produced continuously and written in a cv::Mat. In the code block below, I take data from cv::Mat for each…
nasil122002
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How to add QwtPlot as a base class in Qt promote?

I am using Qt creator 4.2.1. I have installed Qwt lib successfully and been able to drag and drop QwtPlot widget to my form. I have an custom class Plot:public QwtPlot. I wish I can add QwtPlot to my form and then perform a widget promote to Plot.…
Max Li
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How to delete QLabel and QwtSlider in a std::vector

I have a std::vector filled up with QLabel and QwtSlider pointers and I would like to delete the pointers but not the vector. Here my code: QLabel *sliderSimuVarLabel; std::vector labelsSimuVarList; std::vector…
Simu
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Drawing from a thread with qwt

I have a thread that reads data from an external device once per second. I want to draw a graph that displays this data using qwt but I'm having trouble getting it to draw anything. I've added a slot to my dialog which is passed the data to be drawn…
parsley72
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Using QList as the input for QwtPlotCurves setSamples

I have two QList (XList, YList) which saves the dynamic data. I want to use these as the input of the QwtPlotCurves by setSamples. After I check the documentation: void setSamples (const double *xData, const double *yData, int size) void …
colddie
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Qwt - Can we plot an Area chart?

Does anyone know if we can plot an area chart using the Qwt library on Qt creator ? If yes, could someone help me with a sample program ?
chrisrhyno2003
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How to set constant proportions in canvas?

How to set constant proportions in canvas(QwtPlotCanvas)? I am using Qt 4.7.3 and Qwt 6.0.0
neciu
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Probléme with syntax of closestPoint qwt

thank you for helping me use the method of closestPoint qwt to recover the value of y corresponds to a value x. I put that but still the problem of syntax ? error: invalid type ' [int]' for array subscript…
Hatim
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Is QwtRasterData the right Qt device for displaying the data received from get_googlemap?

From here:http://cran.r-project.org/web/packages/ggmap/ggmap.pdf ggmap plots the raster object produced by get_map. From here:http://cran.r-project.org/web/packages/ggmap/ggmap.pdf get_map is a smart function which queries the Google Maps,…
Aquarius_Girl
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