quick help:cannot initialize the zoomer into a specific rect

[fatecasino]

Hi,
When I am loading a new plot I try to have the zoom directly zoomed in a specific area:QRectF currentRect:

QRectF currentRect(topleft,bottomright);
m_zoomer->setEnabled(true);
m_zoomer->setZoomBase(currentRect);
//m_zoomer->setZoomBase( true) ; I tried this as well
myPlot->replot();

QRectF currentRect(topleft,bottomright);
m_zoomer->setEnabled(true);
m_zoomer->setZoomBase(currentRect);
//m_zoomer->setZoomBase( true) ; I tried this as well
myPlot->replot();

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However the the zoomer does not go to that area, it does nothing.
Probably I am missing an important zoomer funciton!
Any help?

[Uwe]

The zoomer is not the API for setting the scales - it is an object intended for user interactions !

myPlot_>setAxisScale( 
    QwtPlot::xBottom, topleft.x(), bottomright.x() );
myPlot->setAxisScale( 
    QwtPlot::yLeft, topleft.y(), bottomright().y() ); // or v.v.
myPlot->replot();
 
// If you really want to have one reinitialize 
// the zoomer with the current scales
 
m_zoomer->setZoomBase( false );

myPlot_>setAxisScale( 
    QwtPlot::xBottom, topleft.x(), bottomright.x() );
myPlot->setAxisScale( 
    QwtPlot::yLeft, topleft.y(), bottomright().y() ); // or v.v.
myPlot->replot();

// If you really want to have one reinitialize 
// the zoomer with the current scales

m_zoomer->setZoomBase( false );

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Uwe

[fatecasino]

thanks,

I just want to activate a "save as..." option, so when the user quits from working with a plot he can save the current zoom and load it up from a file. That's the reason I would like to have the zoomer focused to a specific area.
thanks!

[Uwe]

No, you want to save the current scales - the zoomer is only a helper class, that manipulates the scales.

Uwe

[fatecasino]

No, you want to save the current scales - the zoomer is only a helper class, that manipulates the scales.

Do you mean this combination of functions? (for 2 axis)

//saving the current scales
QwtScaleEngine * 	axisScaleEngine (0)
QwtScaleEngine * 	axisScaleEngine (1)
//loading saved scales
void 	setAxisScaleEngine (int axisId, QwtScaleEngine *)
void 	setAxisScaleEngine (int axisId, QwtScaleEngine *)

//saving the current scales
QwtScaleEngine * 	axisScaleEngine (0)
QwtScaleEngine * 	axisScaleEngine (1)
//loading saved scales
void 	setAxisScaleEngine (int axisId, QwtScaleEngine *)
void 	setAxisScaleEngine (int axisId, QwtScaleEngine *)

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[Uwe]

Do you mean this combination of functions?

Oh no - what makes you believe, that changing the scale engine has something to do with what I wrote.

Once more - please read the documentation.

Uwe