How to add zoom options of 200%, 50% etc.

mzein1292

I need to Add some frequently used zooming setting under menu/Tools/Zoom, e.g. 200% 300% 50%.

As you can see though there is already two options zoom In and zoom Out. and advanced zoom action. all these are in the menu tools tab. under zoom.

Where can I read documentations about such code? Is there a quick trick to adding the zoom options I need ?

@ QMenu *zoomMenu = new QMenu(tr("Zoom"));

mZoomInAction = new QAction(tr("Zoom In"), this);
mZoomInAction->setIcon(QIcon::fromTheme("zoom-in", QIcon(":/media/actions-icons/zoom-in.png")));
mZoomInAction->setIconVisibleInMenu(true);
connect(mZoomInAction, SIGNAL(triggered()), this, SLOT(zoomInAct()));
zoomMenu->addAction(mZoomInAction);

mZoomOutAction = new QAction(tr("Zoom Out"), this);
mZoomOutAction->setIcon(QIcon::fromTheme("zoom-out", QIcon(":/media/actions-icons/zoom-out.png")));
mZoomOutAction->setIconVisibleInMenu(true);
connect(mZoomOutAction, SIGNAL(triggered()), this, SLOT(zoomOutAct()));
zoomMenu->addAction(mZoomOutAction);

mZoomInAction = new QAction(tr("100%"), this);  //My code for 100% zoom. How to start ?

QAction *advancedZoomAction = new QAction(tr("Advanced Zoom..."), this);
advancedZoomAction->setIconVisibleInMenu(true);
connect(advancedZoomAction, SIGNAL(triggered()), this, SLOT(advancedZoomAct()));
zoomMenu->addAction(advancedZoomAction);


mToolsMenu->addMenu(zoomMenu);

@

ceora

What do you need to zoom? In general you should multiply the height and width by a zoom factor: in your case, for 200 % you should multiply by 2 to get the "zoom"
for example:
@
void zoom2x()
{
int factor = 2;
widget()->resize(widget()->size() *factor);
}@

then you should add a QAction to context menu and connect it this slot..
However there should be some example along with Qt, that use zoom with QGraphicsView...