Zoom in a QgraphicsView using pushbutton

**Panagiotis** · 4th February 2016, 16:53

I'm building a very simple image editor on Qt creator.I have my image displayed on a QGraphicsView and i want to give the user the ability to zoom in and out by a pushbutton.

I've searched a lot and found how to zoom in and out through the mouse wheel.As i am very new to Qt i can't adjust it to the pushbutton because i don't understand everything clearly.

I' ve tried this(without understanding completely what i'm doing)but the result isn't the wanted.It zooms in only once and quite abruptly.I want a smoother zoom and as many times as i want.

Qt Code:

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void MainWindow::on_pushButton_clicked(){
    QMatrix matrix;
    ui->graphicsView->setTransformationAnchor(QGraphicsView::AnchorViewCenter);
    matrix.scale(1.0,1.0);
    ui->graphicsView->setMatrix(matrix);
    ui->graphicsView->scale(1,-1);}

void MainWindow::on_pushButton_clicked(){
    QMatrix matrix;
    ui->graphicsView->setTransformationAnchor(QGraphicsView::AnchorViewCenter);
    matrix.scale(1.0,1.0);
    ui->graphicsView->setMatrix(matrix);
    ui->graphicsView->scale(1,-1);}

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I would be very grateful if you guys can help!