Qt-interest Archive, July 2007
How to draw a smooth curve to fit a given list of points
Message 1 in thread
Hi,
Could anyone suggest me a simple way to draw a smooth curve to fit a given
list of points? Those points are well positioned, actully they do not
deviate much from a straight line.
Thanks,
Limin
Message 2 in thread
Have a look at the Qwt:
http://qwt.sourceforge.net/curvescreenshots.html
or you can do it yourself with QPainterPath:
http://doc.trolltech.com/4.3/qpainterpath.html#composing-a-qpainterpath
Cheers,
Peter
> -----Original Message-----
> From: Limin Fu [mailto:phoolimin@xxxxxxxxx]
> Sent: Thursday, July 05, 2007 12:53 PM
> To: qt-interest@xxxxxxxxxxxxx
> Subject: How to draw a smooth curve to fit a given list of points
>
> Hi,
>
> Could anyone suggest me a simple way to draw a smooth curve to fit a
given
> list of points? Those points are well positioned, actully they do not
> deviate much from a straight line.
> Thanks,
>
> Limin
--
[ signature omitted ]
Message 3 in thread
Thanks.
I had a look at Qwt, it can solve my problem, If I can not find an
alternative solution, I will use it. For using QPainterPath, the problem is
setting proper control points for building bezier curves, I was trying to
think in this direction. Maybe I will find a simple heuristic way to specify
the control points.
cheers,
Limin
On 7/5/07, Peter Prade <prade@xxxxxxxxxxx> wrote:
>
> Have a look at the Qwt:
>
> http://qwt.sourceforge.net/curvescreenshots.html
>
> or you can do it yourself with QPainterPath:
>
> http://doc.trolltech.com/4.3/qpainterpath.html#composing-a-qpainterpath
>
> Cheers,
> Peter
>
> > -----Original Message-----
> > From: Limin Fu [mailto:phoolimin@xxxxxxxxx]
> > Sent: Thursday, July 05, 2007 12:53 PM
> > To: qt-interest@xxxxxxxxxxxxx
> > Subject: How to draw a smooth curve to fit a given list of points
> >
> > Hi,
> >
> > Could anyone suggest me a simple way to draw a smooth curve to fit a
> given
> > list of points? Those points are well positioned, actully they do not
> > deviate much from a straight line.
> > Thanks,
> >
> > Limin
>
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Message 4 in thread
Limin Fu wrote:
> I had a look at Qwt, it can solve my problem, If I can not find an
> alternative solution, I will use it.
The code you need is in QwtSpline. This is a quite isolated class, so if you
don't want to include the complete Qwt package take the code and adopt it
to your situation.
HTH,
Uwe
--
[ signature omitted ]
