RE: qwtplot3d-interest digest, Vol 1 #33 - 3 msgs

[Dave C. <dav...@ce...>]

Hi Micha and friends,

I have implemented a similar scaling function as described in the emails
below (Scaling of surface plots). The scaling works great, however I am
left with a problem regarding the axes' scales.

If I make a dataset that is of size (x = 4, y = 1000, z = 1000), then
using the setScale method and algorithm documented below I can
(correctly) show a "cube" of data (even though the dataset is actually a
rectangle). However the scales on the y and z axes are blown completely
out of proportion (i.e. the lines out from the data to the string labels
are exceptionally long). 

Can anyone point me in a direction to correctly scale the axes lines?

If anyone wants a screen shot then let me know and I'll forward it (I
don't have access to the internet to upload it to a web page here at
work). I apologise if this has already been answered on a forum, I can't
get the internet here.

Thanks for your help, 

Dave Cooper
(Canberra, Australia)

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Subject: qwtplot3d-interest digest, Vol 1 #33 - 3 msgs


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Today's Topics:

   1. Scaling of surface plots (Stefan Gerlach)
   2. Re: Scaling of surface plots (Micha Bieber)
   3. Re: Scaling of surface plots (Keith, Todd)

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Message: 1
From: Stefan Gerlach <ge...@mb...>
Organization: MBI
To: qwt...@li...
Subject: Scaling of surface plots
Date: Mon, 25 Apr 2005 09:59:05 +0200


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Hi,=20
=20
I have some difficulties to scale surface plots to the correct size.=20
I'm using "loadFromData(data,cols,rows,0,cols,0,rows)"=20
to make a surface plot with different cols/rows combinations.

Depending on rows/cols and zrange of the data the plot is very tiny or
too=
=20
big.  I tried some combinations of setScale(1/rows,1/cols,1/zrange),
etc.=
=20
but had no luck to find the right combination.=20
=20
Is there a way to scale the surface plot to the correct size (depending
on=
=20
rows,cols,zrange)? How can i scale the plot to have all axes with the
same=
=20
size (aspect ratio) and always fit on the screen?
=20
Thanks in advance.
Stefan Gerlach

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Message: 2
Date: Mon, 25 Apr 2005 14:30:59 +0200
From: Micha Bieber <kri...@us...>
To: qwt...@li...
Subject: Re: Scaling of surface plots

Stefan, please check the forum for an answer.

Micha  
-- 



--__--__--

Message: 3
Subject: Re: Scaling of surface plots
Date: Mon, 25 Apr 2005 09:22:54 -0500
From: "Keith, Todd" <ke...@um...>
To: <qwt...@li...>
Reply-To: qwt...@li...

Consider something like this ...

*****

Let minX and maxX be the minimum and maximum value, respectively, of =
your data along the x-Axis

Let minY and maxY be the minimum and maximum value, respectively, of =
your data along the y-Axis

Let minZ and maxZ be the minimum and maximum value, respectively, of =
your data along the z-Axis

*****

double rangeX =3D fabs(maxX - minX);

double rangeY =3D fabs(maxY - minY);

double rangeZ =3D fabs(maxZ - minZ);

double maxRange =3D rangeX;

if (rangeY > maxRange) maxRange =3D rangeY;

if (rangeZ > maxRange) maxRange =3D rangeZ;

double scaleX =3D maxRange / rangeX;

double scaleY =3D maxRange / rangeY;

double scaleZ =3D maxRange / rangeZ;

double maxScale =3D scaleX;

if (scaleY > maxScale) maxScale =3D scaleY;

if (scaleZ > maxScale) maxScale =3D scaleZ;

setScale(scaleX, scaleY, scaleZ);




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