Render Qml efficiently on GraphicsView

ytbryan

Hi all,

My code is below.

How do I efficiently render qml on graphicsView? my animation qml is appearing very slow when rendered in QDeclarativeEngine. Is there a way to optimise it at the c++ level?

It was running ok at qml level.

Thank you

@
int main(int argc, char *argv)
{
QApplication app(argc, argv);
GraphicsView view;
view.setViewport(new QGLWidget(QGLFormat(QGL::SampleBuffers)));
view.setViewportUpdateMode(QGraphicsView::FullViewportUpdate);
OpenGLScene scene = new OpenGLScene;
// provides an environment for instantiating QML components
QDeclarativeEngine engine;
// encapsulates a QML component definition
QDeclarativeComponent component(&engine, QUrl::fromLocalFile("BounceAnimation.qml"));
// creates the graphics item for QML at the engine's root context
QDeclarativeItem *item = qobject_cast<QDeclarativeItem *>(component.create());
// set position of item
item->setPos(10,500);
scene->addItem(item);
view.setScene(scene);
view.show();
view.resize(1024, 2000);

return app.exec(&#41;;

}
@

lgeyer

"This":http://doc.qt.nokia.com/4.7-snapshot/qdeclarativeview.html#details might help you.

ytbryan

Thanks Lukas for the reply.

Is there render performance difference comparing the QDeclarativeView with QDeclarativeEngine?

Also, i did the following but the qml rendering is still not smooth. Any other advices? anyone?

@ scene->setStickyFocus(true);
scene->setItemIndexMethod(QGraphicsScene::NoIndex);@