[SOLVED] QwtPlot3d Linux

[avmg]

Hi,

I downloaded the QwtPlot3d feature but at the moment it doesn't work for me. I try to run the examples, and also i tried to add the include files to a new project but at the end the errors are same. Looks like they are related with some "glu" library, this is one of the errors:

error: 'gluErrorString' was not declared in this scope

I found some instructions to use QwtPlot3d in windows but nothing for Linux. I also don't know if i need to install some "OpenGL" staff or whatever...

I saw many people with this problem but i couldn't find any answer or solution yet.

Any suggestion???

Thanks,
Andrew

[JKSH]

Hi,

Yes QwtPlot3D "requires OpenGL 1.1 or higher":http://qwtplot3d.sourceforge.net/. You will need to install OpenGL development libraries.

[avmg]

Ok, I will try it.

Thanks

[avmg]

Hi again,

I installed OpenGL as you recomend me but now when i create a Plot3D i get this error:

error: undefined reference to `Qwt3D::Plot3D::Plot3D(QWidget*, QGLWidget const*)'
File not found: "path from the Form1.cpp"

This is how i have created the plot:

@
//Form1.h
public:
Qwt3D::Plot3D *plot;

//Form1.cpp
QGridLayout *grid = new QGridLayout( );
plot = new Plot3D();
grid->addWidget( plot, 0, 0 );
@

Thanks,
Andrew

[SGaist]

Hi,

How did you setup the library ?

[avmg]

Hi!

First thing I did after downloading the library was build "qwtplot3d.pro" and get these dynamic libraries:

libqwtplot3d.so
libqwtplot3d.so.0
libqwtplot3d.so.0.3
libqwtplot3d.so.0.3.0

Then I use them for the new projects, or starting simply, let's try with the examples. So I open the example "simpleplot" with the next files, and I modify the common.pro file to add the libraries:

simpleplot.cpp:
@
#include <math.h>
#include "/home/amg/Qt/5.3/gcc_64/include/QtWidgets/qapplication.h"
#include <qwt3d_plot.h>
#include <qwt3d_curve.h>
#include <qwt3d_color.h>
#include <qwt3d_function.h>

using namespace Qwt3D;

class Rosenbrock : public Function
{
public:

Rosenbrock(Curve& pw)
:Function(pw)
{
}

double operator()(double x, double y)
{
  return log((1-x)*(1-x) + 100 * (y - x*x)*(y - x*x)) / 8;
}

};

class RosenbrockNegative : public Function
{
public:

RosenbrockNegative(Curve& pw)
:Function(pw)
{
}

double operator()(double x, double y)
{
  return -1.0 * (log((1-x)*(1-x) + 100 * (y - x*x)*(y - x*x)) / 8);
}

};

class Plot : public Plot3D
{
public:
Plot();
private:
Curve* curve_p;
Curve* curve_p2;
};

Plot::Plot()
{
curve_p = new Curve(this);
addCurve(curve_p);
Rosenbrock rosenbrock(*curve_p);

rosenbrock.setMesh(41,31);
rosenbrock.setDomain(-1.73,1.5,-1.5,1.5);
rosenbrock.setMinZ(-10);

rosenbrock.create();

setTitle("A Simple SurfacePlot Demonstration");

curve_p2 = new Curve(this);
addCurve(curve_p2);
RosenbrockNegative rosenbrockNegative(*curve_p2);

rosenbrockNegative.setMesh(41,31);
rosenbrockNegative.setDomain(-1.73,1.5,-1.5,1.5);
rosenbrockNegative.setMinZ(-10);

rosenbrockNegative.create();

setRotation(30,0,15);
setScale(1,1,1);
setShift(0.15,0,0);
setZoom(0.9);

for (unsigned i=0; i!=coordinates()->axes.size(); ++i)
{
  coordinates()->axes[i].setMajors(7);
  coordinates()->axes[i].setMinors(4);
}


coordinates()->axes[X1].setLabelString("x-axis");
coordinates()->axes[Y1].setLabelString("y-axis");
//coordinates()->axes[Z1].setLabelString(QChar(0x38f)); // Omega - see http://www.unicode.org/charts/


setCoordinateStyle(BOX);

// comment out the next line to use default single legend mode
setDoubleLegend(); // setup the default colour legend mode

//setup the multi-curve colour legends
curve_p->setColorLegend(0, isDoubleLegend(),
isDoubleLegend() ? QSize(2,28) : QSize(3,32),
isDoubleLegend() ? QPoint(7,10) : QPoint(3,10));
curve_p2->setColorLegend(1, isDoubleLegend(),
isDoubleLegend() ? QSize(2,28) : QSize(3,32),
isDoubleLegend() ? QPoint(7,10) : QPoint(3,10));

showColorLegend(true); // show the actual curve legends

updateData();
updateGL();

}

int main(int argc, char **argv)
{
QApplication a(argc, argv);
Plot plot;
#if QT_VERSION < 0x040000
a.setMainWidget(&plot);
#endif
plot.resize(800,600);
plot.show();
return a.exec();
}
@

simpleplot.pro:
@
include( ../common.pri )
SOURCES = simpleplot.cpp
@

common.pri
@
TEMPLATE = app
CONFIG += qt warn_on thread release
UI_DIR = tmp
MOC_DIR = tmp
OBJECTS_DIR = tmp
INCLUDEPATH += ../../include
DEPENDPATH = $$INCLUDEPATH
DESTDIR = ../bin

unix:LIBS += -L/home/amg/Qt/build-qwtplot3d-Qt_5_2_0_gcc_64-Debug/lib/release/linux -lqwtplot3d

linux-g++:QMAKE_CXXFLAGS += -fno-exceptions

CONFIG(debug, debug|release) {
DESTDIR = ../bin/debug
} else {
DESTDIR = ../bin/release
}

Choose +/- on the following line to show/hide debug output relating to library branch code

DEFINES -= QT_NO_DEBUG_OUTPUT

win32 {
win32-g++ {
LIBS += ../../lib/qwtplot3d.dll
} else {
LIBS += ../../lib/qwtplot3d.lib
TEMPLATE = vcapp
CONFIG(debug, debug|release) {
QMAKE_LFLAGS += /NODEFAULTLIB:msvcrt
}
}
DEFINES += QT_DLL QWT3D_DLL
RC_FILE = ../icon.rc
}

MYVERSION = $$[QMAKE_VERSION]
ISQT4 = $$find(MYVERSION, ^[2-9])

!isEmpty( ISQT4 ) {
RESOURCES = ../images.qrc
QT += opengl
}

isEmpty( ISQT4 ) {
CONFIG += opengl
}
@

The only thing i change was the next line:
@unix:LIBS += -L/home/amg/Qt/build-qwtplot3d-Qt_5_2_0_gcc_64-Debug/lib/release/linux -lqwtplot3d@

Because by default is like this...:
@unix:LIBS += -lqwtplot3d -L../../lib@

And also i modified some includes which were not detected. The errors i get are:

/home/amg/Qt/build-qwtplot3d-Qt_5_2_0_gcc_64-Debug/lib/release/linux/libqwtplot3d.so: undefined reference to gluDisk' /home/amg/Qt/build-qwtplot3d-Qt_5_2_0_gcc_64-Debug/lib/release/linux/libqwtplot3d.so: undefined reference to gluNewQuadric'
/home/amg/Qt/build-qwtplot3d-Qt_5_2_0_gcc_64-Debug/lib/release/linux/libqwtplot3d.so: undefined reference to gluQuadricOrientation' /home/amg/Qt/build-qwtplot3d-Qt_5_2_0_gcc_64-Debug/lib/release/linux/libqwtplot3d.so: undefined reference to gluUnProject'
/home/amg/Qt/build-qwtplot3d-Qt_5_2_0_gcc_64-Debug/lib/release/linux/libqwtplot3d.so: undefined reference to gluQuadricNormals' /home/amg/Qt/build-qwtplot3d-Qt_5_2_0_gcc_64-Debug/lib/release/linux/libqwtplot3d.so: undefined reference to gluQuadricDrawStyle'
/home/amg/Qt/build-qwtplot3d-Qt_5_2_0_gcc_64-Debug/lib/release/linux/libqwtplot3d.so: undefined reference to gluDeleteQuadric' /home/amg/Qt/build-qwtplot3d-Qt_5_2_0_gcc_64-Debug/lib/release/linux/libqwtplot3d.so: undefined reference to gluCylinder'
/home/amg/Qt/build-qwtplot3d-Qt_5_2_0_gcc_64-Debug/lib/release/linux/libqwtplot3d.so: undefined reference to `gluProject'

These funcionts belongs to glu.h. I saw also in similar cases that there's not openGL/Glut library linked to project.

But i tried many things but i'm not sure where is the problem...

Thanks,
Andrew

[SGaist]

Then you need to link to glut by hand

[avmg]

I saw something like adding -lGL -lGLU, but i don't where and how...

[SGaist]

Your pro file

@
LIBS += -lglu
@

[avmg]

I checked where are the libraries and i add:

@unix:LIBS += -L/usr/lib/x86_64-linux-gnu/mesa/ -lglu@

and also i tried with:

@unix:LIBS += -L/usr/lib/x86_64-linux-gnu -lGLU@

..because the files are named libGLU.so, but didn't work. In the second case i get these errors:

/home/amg/Qt/build-qwtplot3d-Qt_5_2_0_gcc_64-Debug/lib/release/linux/libqwtplot3d.so: undefined reference to gluDisk' /home/amg/Qt/build-qwtplot3d-Qt_5_2_0_gcc_64-Debug/lib/release/linux/libqwtplot3d.so: undefined reference to gluNewQuadric'
/home/amg/Qt/build-qwtplot3d-Qt_5_2_0_gcc_64-Debug/lib/release/linux/libqwtplot3d.so: undefined reference to gluQuadricOrientation' /home/amg/Qt/build-qwtplot3d-Qt_5_2_0_gcc_64-Debug/lib/release/linux/libqwtplot3d.so: undefined reference to gluUnProject'
/home/amg/Qt/build-qwtplot3d-Qt_5_2_0_gcc_64-Debug/lib/release/linux/libqwtplot3d.so: undefined reference to gluQuadricNormals' /home/amg/Qt/build-qwtplot3d-Qt_5_2_0_gcc_64-Debug/lib/release/linux/libqwtplot3d.so: undefined reference to gluQuadricDrawStyle'
/home/amg/Qt/build-qwtplot3d-Qt_5_2_0_gcc_64-Debug/lib/release/linux/libqwtplot3d.so: undefined reference to gluDeleteQuadric' /home/amg/Qt/build-qwtplot3d-Qt_5_2_0_gcc_64-Debug/lib/release/linux/libqwtplot3d.so: undefined reference to gluCylinder'
/home/amg/Qt/build-qwtplot3d-Qt_5_2_0_gcc_64-Debug/lib/release/linux/libqwtplot3d.so: undefined reference to `gluProject'

[SGaist]

What do you get if you run ldd libqwtplot3d.so ?

[avmg]

If I run it in a terminal it says that the file doesn't exist... Do I need to run it in its file location?

[avmg]

Now i build qwtplot3d in a terminal:

@cd qwtplot3d; qmake && make; cd ..
@

I get new libraries, i added them:

@unix:LIBS += -L/home/amg/Qt/qwtplot3d/lib/release/unix -lqwtplot3d
unix:LIBS += -L/usr/lib/x86_64-linux-gnu -lGLU@

And now i get these errors:

/usr/bin/ld: /home/amg/Qt/qwtplot3d/lib/release/unix/libqwtplot3d.a(gl2ps.o): undefined reference to symbol 'compress'
//lib/x86_64-linux-gnu/libz.so.1: error adding symbols: DSO missing from command line
collect2: error: ld returned 1 exit status

'compress' i guess is from zlib compressor needed for the qwt3dplot, but i already install...

[avmg]

SOLVED!

I was adding the LIBS in different lines. I put the compressor, the qwt3dplot and glu libraries in the same command and finally it worked!!!

@unix:LIBS += -L/home/amg/Qt/qwtplot3d/lib/release/unix -lqwtplot3d -lz -lGLU@

Thanks!

[SGaist]

You can use multiple lines without any problem, just ensure you are writing it right.

@
unix {
LIBS += -L/home/amg/Qt/qwtplot3d/lib/release/unix
-lqwtplot3d

LIBS += -lz -lGLU
}
@

Since it's solved now, please update the thread title prepending [solved] so other forum users may know a solution has been found :)