replot in Qwt Zoomer

[Uwe]

Try to understand, when your axes get initialized like we can see them in your first screenshot. Than take care, that your zoomer gets initialized with these ranges.

zoomer->setZoomBase(this->rect());

Calling setZoomBase without parameter initializes the zoomer with the current scale ranges ( this->rect() is wrong, because it is something else in widget coordinates ).

Uwe