Combining OpenCascade into a Qt4 QtCreator application

[tandrews]

Hi,

Can anyone show me how to render/paint/display an object created by opencascade?

I have a very simple functional piece of opencascade code that creates a 3D cylinder:

#include <BRepPrimAPI_MakeCylinder.hxx>
#include <gp_Ax2.hxx>
#include <gp_Pnt.hxx>
#include <TopoDS.hxx>
#include <AIS_Shape.hxx>
 
TopoDS_Shape MakeCylinder(const Standard_Real radius , const Standard_Real length)
{
 
    // Create coordinates & geometry
    gp_Pnt origin(0 , 0 , 0);
    gp_Dir direction = gp::DZ();
    gp_Ax2 axis(origin , direction);
 
    // Create a cylinder
    BRepPrimAPI_MakeCylinder cylinder(axis , radius , length);
    TopoDS_Shape shape = cylinder.Shape(); 
 
    return shape;
}

#include <BRepPrimAPI_MakeCylinder.hxx>
#include <gp_Ax2.hxx>
#include <gp_Pnt.hxx>
#include <TopoDS.hxx>
#include <AIS_Shape.hxx>

TopoDS_Shape MakeCylinder(const Standard_Real radius , const Standard_Real length)
{

    // Create coordinates & geometry
    gp_Pnt origin(0 , 0 , 0);
    gp_Dir direction = gp::DZ();
    gp_Ax2 axis(origin , direction);
    
    // Create a cylinder
    BRepPrimAPI_MakeCylinder cylinder(axis , radius , length);
    TopoDS_Shape shape = cylinder.Shape(); 
    
    return shape;
}

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I have created an empty widget application using qtcreator, and that has generated main.cpp, widget.cpp, widget.h, and widget.ui:

foo.jpg

#include <QApplication>
#include "widget.h"
 
int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    Widget w;
    w.show();
 
    return a.exec();
}

#include <QApplication>
#include "widget.h"

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    Widget w;
    w.show();
    
    return a.exec();
}

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and

#include "widget.h"
#include "ui_widget.h"
 
Widget::Widget(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::Widget)
{
    ui->setupUi(this);
}
 
Widget::~Widget()
{
    delete ui;
}

#include "widget.h"
#include "ui_widget.h"

Widget::Widget(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::Widget)
{
    ui->setupUi(this);
}

Widget::~Widget()
{
    delete ui;
}

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To call my piece of opencascade code I have changed 'Widget' to this:

Widget::Widget(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::Widget)
{   
    ui->setupUi(this);
 
    // I added this:
    QApplication::setOverrideCursor( Qt::WaitCursor );
    TopoDS_Shape aCylinder = MakeCylinder(50,400);
    Handle(AIS_Shape) AISBottle = new AIS_Shape(aCylinder);
    QApplication::restoreOverrideCursor();
    // Now what?
}

Widget::Widget(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::Widget)
{   
    ui->setupUi(this);
    
    // I added this:
    QApplication::setOverrideCursor( Qt::WaitCursor );
    TopoDS_Shape aCylinder = MakeCylinder(50,400);
    Handle(AIS_Shape) AISBottle = new AIS_Shape(aCylinder);
    QApplication::restoreOverrideCursor();
    // Now what?
}

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As you can see I still need to display my image somehow? This would appear to be such a simple thing to do, but I am completely new to Qt and opencascade, so the tutorial example at the opencascade website goes totally over my head.
Please can someone help me?

I am currently using Qt Creator version 2.5.0 on Debian. The opencascade version in Debian is based on opencascade 6.5.2, and I think Qt is version 4.8.2.

Many thanks!
Thomas

[eryar]

Hi Thomas,

I think you can refer the Qt samples in the samples folder of OpenCASCADE.

Or you can refer to the following website:
http://www.opencascade.org/org/forum...25208/?forum=5

Regards,
Xing