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HongLiang Wang | 23 May 2012 15:55
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how to click buttons to zoom in and out instead of mouse dragging?

Hello all,


I am working on a qwt plot curve zooming problem. Basically I would like to create two buttons so that if the user clicks one button, the plot is zooming in and same for the other button.

I also don't want the user to use mouse dragging on the plot to zooming.

I searched into the source code and got the impression that qwtplotzoomer::zoom() should be responsible for zooming in and out.

so I was using following code in button click slots:

void
JBStatGraph::horizontalZoomIn(void)
{
    zoomer->zoom(+10);
}

void
JBStatGraph::horizontalZoomOut(void)
{
    zoomer->zoom(-10);
}

Tracing message shows that zoomer->zoomRectIndex()  always returns 0, no matter +10 and -10 is send to zoom().  but I don't know why.

Can anybody give me a hand?

Furthermore, I don't know how to disable mousing dragging for zooming. Can anybody give me a suggestion?

Thanks in advance.


Hongliang Wang

HVR Software bv | Haaksbergweg 45 | 1101 BR Amsterdam | The Netherlands

T. +31-020 312 7517 | F. +31-020 312 7509 | hongliang.wang <at> hvr-software.com

www.hvr-software.com


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Uwe Rathmann | 24 May 2012 07:47
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Re: how to click buttons to zoom in and out instead of mouse dragging?

On 05/23/2012 03:55 PM, HongLiang Wang wrote:

>
> I am working on a qwt plot curve zooming problem. Basically I would 
> like to create two buttons so that if the user clicks one button, the 
> plot is zooming in and same for the other button.
>

This is simply multiplying the current range of the scale by some 
factor. Forget about the zoomer - all you need is 
QwtPlot::axisScaleDiv() + QwtPlot::setAxisScale() used in a slot with 
about 10 lines of code.

Uwe

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HongLiang Wang | 24 May 2012 11:19
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Re: how to click buttons to zoom in and out instead of mouse dragging?

Hi Uwe,
 
Sorry that I didn't make myself clear. What I want is first use buttom to zoom in and out. Then attach the scrollbar to X Axis for scrolling. So I guess scrollzoom and scrollbar is what I need.
 
But I don't know how to achieve my goal. Can you please advise?
 
Thanks and Best Regards,

Hongliang Wang

HVR Software bv | Haaksbergweg 45 | 1101 BR Amsterdam | The Netherlands

T. +31-020 312 7517 | F. +31-020 312 7509 | hongliang.wang <at> hvr-software.com

www.hvr-software.com




On Thu, May 24, 2012 at 7:47 AM, Uwe Rathmann <Uwe.Rathmann <at> tigertal.de> wrote:
On 05/23/2012 03:55 PM, HongLiang Wang wrote:

>
> I am working on a qwt plot curve zooming problem. Basically I would
> like to create two buttons so that if the user clicks one button, the
> plot is zooming in and same for the other button.
>

This is simply multiplying the current range of the scale by some
factor. Forget about the zoomer - all you need is
QwtPlot::axisScaleDiv() + QwtPlot::setAxisScale() used in a slot with
about 10 lines of code.

Uwe

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Uwe Rathmann | 25 May 2012 07:50
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Re: how to click buttons to zoom in and out instead of mouse dragging?

On 05/24/2012 11:19 AM, HongLiang Wang wrote:

> So I guess scrollzoom and scrollbar is what I need.

When you are talking about the classes from the realtime example: only 
ScrollBar and the layout code in ScrollZoomer are relevant. Better don't 
derive your code from QwtPlotZoomer, use setAxisScale instead.

Uwe

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Gmane