QOpenGLWidget, QRubberBand ?

Dariusz

Hey

How can I introduce a selection rectangle to my QOpenGLWidget/context/gl viewport?

I was hoping I could use the QRubberBand and then get its initialPosition + end position to determine the pixels I want, but the rubber band never gets drawn. And its size() return -1,-1;

TIA

SGaist

Hi,

How are you using QRubberBand ?

Dariusz

Hey

In QOpenGLWidget

initializeGL(){
    mAreaSelection = new QRubberBand(QRubberBand::Rectangle, this);// dynamic_cast<QWidget *>(parent()));
}

mouseMoveEvent(){
    if (mMouseDragDistance > 3 && mMouseShiftSelection) {
        mAreaSelection->setGeometry(QRect(mousePos, QSize()));
        mAreaSelection->show();
        mMouseDragSelection = true;
        return;
    }
}

SGaist

You have mixed things up.

Take a look at the QRubberBand details. There's mousePressEvent that's reimplemented to setup the rubber band, then mouseMoveEvent to handle it's geometry and finally mouseReleaseEvent to hide it.

Dariusz

O dear I did mess it up ! Blah silly me! Will give it a go thanks so much!