So today my colleague ask me ” I have a variable VERSION in .pro file (qmake project file) I want to use that variable in my C++ code, How to do that?”
After a little search on Google I figured that we have export project files variable as a macro for C/C++ code and it very easy.
As the per problem we want VERSION variable in C++ code. So in project file we write
DEFINES += VERSION=\\\"$$VERSION\\\"
and in C/C++ code just
qDebug()<< VERSION ;
this is just a awesome.
I am contributing to KDE from last 1 yr. The community has given me lots of things :
1) Good Friends.
2) Metors.
3) Knowledge.
and many more.
And I want all of you to be a part of this community and grow this community. you have a great change to get the live experience of all this things and be a part of the community by attending India’s 1st ever KDE conference conf.kde.in.
Only 15 days remain for the conference and ONLY 3 days left for discounted online registration. After that the registration fees goes up so hurry up register your seat http://kde.in/conf/register .
I am almost ready with my slides for the talk and excited to meet all the KDE hacker, here I invite all of you to come and join us.
enjoy!!
If you are a KDE or Qt Developer or Opensource enthusiast then DON’T miss India’s fist ever KDE conference.
My 2 talks got selected for conf.kde.in 1) Writing Kate Plugins 2 ) Getting started with Qt programming (with Prashanth Udupa) and there are many more interesting talks by really cool speakers. Here is the list -> http://kde.in/conf/talks/ .
If you have’t yet register then do it now (http://kde.in/conf/register/) if you are a student or professor you got a discount too 
and for student how needs to provide participation letter to there college here it is http://kde.in/conf/letter-for-participation/ hurry up secure your sit, lock you calendar and plan your trip 
. See you there.
Cheers !!
In my last post I mention about the disappointment I got because of No KDE day at Foss.in/2010.
But here’s the GOOD NEWS instead of KDE day we all (Kde developer’s team Kde India ) decided to have a KDE conference in India hurry!! .
So we have First Ever KDE conference in India details are as follow:
Website : http://conf.kde.in
When: 9 – 13 March.
Where : R V College Of Engineering,
R V Vidyanikethan Post,
Mysore Road,
Bengaluru – 560004,
Karnataka, India
So lock your calendars, apply for leaves and get prepare for the event!
All are welcome from newbies to Old contributors.
See you there Enjoy .
I attend India’s Biggest Open-Source conference FOSS.IN from 2007, and in 2009, in the same conference, I started contributing to KDE/Kate project.
I wrote Tabify plugin for Kate editor and also submitted a few patches to kate and KDE. Then I got lazy and didn’t do much significant contributions.
And again the Foss.in season arrived and I thought why not give a talk on Kate plugin in Foss.in KDE day. There are not much Kate contributors in India and I can share what I learnt and we can get more contributors in Kate too. That seemed to be an inspiring idea.
But I got disappointed since this year KDE day’s plan was dropped and I decided to drop my plan as well!! But thanks to people at my office ( VCL team ) for forcing me to do the presentation and finally I applied for the talk.
Eventually my talk got selected and I became a speaker at Foss.in. On 16th Dec 2010 at 11 am I gave my talk on “Writing plugins for Kate and enhancing Kate”.
Here is the presentation.
We are about to begin on a project that requires us to have floating and transparent widgets over VTK render-window output. About a year back, we had wanted to provide something similar to VTK Designer 2. We wanted users to have the ability to load UI (created using Qt Designer) directly on the VTK output window. At that time (you can follow the thread here) we were unable to come up with something satisfactory.
With the recent changes in Qt, it is now possible for us to have vtkRenderWindow within QGraphicsView. Infact we can now have vtkRenderWindow paint on to a QGLWidget viewport of QGraphicsView. Thats exactly what the vtkQtGraphicsViewRenderWindow class allows us to do.
The class is defined as follows
#ifdef Q_WS_WIN
#include "vtkWin32OpenGLRenderWindow.h"
typedef vtkWin32OpenGLRenderWindow vtkRenderWindowClass;
#endif
#ifdef Q_WS_X11
#include "vtkXOpenGLRenderWindow.h"
typedef vtkXOpenGLRenderWindow vtkRenderWindowClass;
#endif
class vtkQtGraphicsViewRenderWindow : public QGraphicsView,
public vtkRenderWindowClass
{
Q_OBJECT
public:
vtkQtGraphicsViewRenderWindow(QWidget* parent = 0);
~vtkQtGraphicsViewRenderWindow();
....
};
Since vtkQtGraphicsViewRenderWindow is a subclass of both QGraphicsView and vtkRenderWindow,
- we can add any QGraphicsItem to its scene.
- we can use it as a drop-in replacement for vtkRenderWindow.
For example, take a look at the code below.
vtkRenderer* CreateVTKPipeline()
{
vtkRenderer* renderer = vtkRenderer::New();
// Omitted code that create a fractal terrain scene.
return renderer;
}
int main(int argc, char** argv)
{
QApplication a(argc, argv);
vtkRenderer* renderer = CreateVTKPipeline();
vtkQtGraphicsViewRenderWindow gView;
gView.AddRenderer( renderer );
gView.resize(800, 600);
gView.show();
QCalendarWidget* calendar = new QCalendarWidget;
calendar->setWindowOpacity(0.7);
QGraphicsProxyWidget* sceneWidget = new QGraphicsProxyWidget(0, Qt::Dialog);
sceneWidget->setWidget(calendar);
sceneWidget->setPos( -sceneWidget->boundingRect().topLeft() );
sceneWidget->setFlag(QGraphicsItem::ItemIsMovable);
sceneWidget->setCacheMode(QGraphicsItem::DeviceCoordinateCache);
sceneWidget->setWindowTitle("Calendar Widget");
QGraphicsScene* scene = gView.scene();
scene->addItem(sceneWidget);
return a.exec();
}
Output of the above program becomes:
vtkQtGraphicsViewRenderWindow
Whats cooler about the above program is that we can move and resize the translucent QCalendarWidget – and have the background VTK scene updated!
You can checkout a copy of the class and test program from here:
https://svn2.hosted-projects.com/vcreatelogic/VCLTools/vtkQtGraphicsViewRenderWindow
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[original post : http://www.vcreatelogic.com/p/2010/06/using-vtkrenderwindow-with-qgraphicsview/ ]