zoom qwidget

rest

I'm having a problem with zooming on a qwidget, like when i zoom it zooms just on up left, and when i am trying to translate with the cursor position that is mapped from global i start to draw with an offset and the shapes moves with the cursor.

void Draw::paintEvent(QPaintEvent *event)
{
for(int i = 0; i < allShapes.size(); i++)
{

    QPainterPath path;
    path.moveTo(allShapes[i].getAllPoints()[0].getX(), allShapes[i].getAllPoints()[0].getY());      // we move the path to the first position
    for(int j = 1; j < allShapes[i].getAllPoints().size(); j++)
        if(allShapes[i].getAllPoints()[j].ge`enter code here`tType() == 'l' && allShapes[i].getAllPoints()[j-1].getType() != 'b')
            path.lineTo(allShapes[i].getAllPoints()[j].getX(), allShapes[i].getAllPoints()[j].getY());
        else if(allShapes[i].getAllPoints()[j].getType() == 'b' && allShapes[i].getAllPoints()[j+1].getType() == 'b')
        {
            path.lineTo(allShapes[i].getAllPoints()[j-1].getX(), allShapes[i].getAllPoints()[j-1].getY());
            path.cubicTo(allShapes[i].getAllPoints()[j].getX(), allShapes[i].getAllPoints()[j].getY(), allShapes[i].getAllPoints()[j+1].getX(), allShapes[i].getAllPoints()[j+1].getY(), allShapes[i].getAllPoints()[j+2].getX(), allShapes[i].getAllPoints()[j+2].getY());
        }

 painter.translate(this->mapFromGlobal(QCursor::pos()));
painter.scale(m_ScaleFactor.scaleX, m_ScaleFactor.scaleY);


for(int i = 0; i < allShapes.size(); i++)
    for(int j = 1; j < allShapes[i].getAllPoints().size(); j++)
    {

        if(allShapes[i].getAllPoints()[j].getType() == 'l')
            painter.drawLine(allShapes[i].getAllPoints()[j-1].getX(), allShapes[i].getAllPoints()[j-1].getY(), allShapes[i].getAllPoints()[j].getX(), allShapes[i].getAllPoints()[j].getY());
        if(allShapes[i].getAllPoints()[j].getType() == 'b' && allShapes[i].getAllPoints()[j-1].getType() == 'l')
            painter.drawLine(allShapes[i].getAllPoints()[j-1].getX(), allShapes[i].getAllPoints()[j-1].getY(), allShapes[i].getAllPoints()[j].getX(), allShapes[i].getAllPoints()[j].getY());
        if(allShapes[i].getAllPoints()[j].getType() == 'b' && allShapes[i].getAllPoints()[j+1].getType() == 'b')
        {
            QPainterPath path;
            path.moveTo(allShapes[i].getAllPoints()[j-1].getX(), allShapes[i].getAllPoints()[j-1].getY());
            path.cubicTo(allShapes[i].getAllPoints()[j].getX(), allShapes[i].getAllPoints()[j].getY(), allShapes[i].getAllPoints()[j+1].getX(), allShapes[i].getAllPoints()[j+1].getY(), allShapes[i].getAllPoints()[j+2].getX(), allShapes[i].getAllPoints()[j+2].getY());
            painter.drawPath(path);
        }
    }




}

 void Draw::wheelEvent(QWheelEvent *event)

{

const int degrees = event->delta() / 8;
int steps = degrees / 15;
double scaleFactor = 1.0;
const qreal minFactor = 1.0;
const qreal maxFactor = 10.0;

    if(steps > 0)
    {
        m_ScaleFactor.scaleX = (m_ScaleFactor.scaleX >= maxFactor) ? m_ScaleFactor.scaleX : (m_ScaleFactor.scaleX + scaleFactor);
        m_ScaleFactor.scaleY = (m_ScaleFactor.scaleY >= maxFactor) ? m_ScaleFactor.scaleY : (m_ScaleFactor.scaleY + scaleFactor);
    }
    else
    {
        m_ScaleFactor.scaleX = (m_ScaleFactor.scaleX <= minFactor) ? minFactor : (m_ScaleFactor.scaleX - scaleFactor);
        m_ScaleFactor.scaleY = (m_ScaleFactor.scaleY <= minFactor) ? minFactor : (m_ScaleFactor.scaleY - scaleFactor);
    }

}

patrik08

Is This a QAbstractScrollArea or QGraphicsScene .. or simply QWidget?

rest

it is a simply qwidget where i draw some shapes, and i i want the to zoom on the mouse position. the problem is make a lot of stuff on paintevent.