qwtplot3d-interest

Re: Custom data colors in a surface plot

[Micha B. <kri...@us...>]

.. but

> double stepR = abs(r1-r2)/dsize;

is > 0

Later in your loop:

> rgb.r = r1-i*stepR;

sgives value <= 0. These values will be clamped, because a color
component has values 0.0 <= comp_col <= 1.0;

Micha  
-- 

Re: Custom data colors in a surface plot

[Micha B. <kri...@us...>]

Saturday, January 1, 2005, 22:03:54, Micha Bieber wrote:

>> double stepR = abs(r1-r2)/dsize;
>                  ^^^
> This gives an integer division resulting in 0 (r1-r2<255) or 1.

Sorry, dsize is of course a double ...

Micha  
-- 

Re: Custom data colors in a surface plot

[Micha B. <kri...@us...>]

> double stepR = abs(r1-r2)/dsize;
                 ^^^
This gives an integer division resulting in 0 (r1-r2<255) or 1.

Micha  
-- 

Custom data colors in a surface plot

[Ion V. <vas...@pc...>]

Hi,

I'd like to customize the data color in a surface plot using a color 
gradient going from a QColor cMax to a QColor cMin (like the one in the 
default standard color implementation, going from red to blue).

I've tried to follow the approach from the enrichements example. Using the 
following code I only get an uniform green color:

void Graph3D::setColor()
{	
   Qwt3D::ColorVector cv;

   QColor cMax=QColor(green); // color for the max data
   QColor cMin=QColor (red); // color for the min data

   unsigned int size=255;
   double dsize = size;

   int r1=cMax.red();
   int r2=cMin.red();

   double stepR = abs(r1-r2)/dsize;

   int g1=cMax.green();
   int g2=cMin.green();

   double stepG = abs(g1-g2)/dsize;

   int b1=cMax.blue();
   int b2=cMin.blue();

   double stepB = abs(b1-b2)/dsize;

  RGBA rgb;
  for (unsigned int i=0; i<size; i++)
	{
     rgb.r = r1-i*stepR;
	rgb.g = g1-i*stepG;
	rgb.b = b1-i*stepB;

     cv.push_back(rgb);	
     }

	StandardColor* col = new StandardColor(sp);
	col->setColorVector(cv);
	
	sp->setDataColor(col);
	sp->updateData();
	sp->updateGL();
}

Could anyone give me a hint, please?
Thanks in advance,
Ion

Don't care ! (New release: QwtPlot3D 0.3.0 beta)

[Micha B. <kri...@us...>]

Sorry folks,

This was by mistake. qwt3d 0.3 comes out in January '05.

Micha
-- 

New release: QwtPlot3D 0.3.0 beta

[Micha B. <kri...@us...>]

A new version of QwtPlot3D is out:

New features:

    * edge enrichments (includes cutting planes)
    * data cursor
    

Look at http://qwtplot3d.sourceforge.net/  for details.

Enjoy !

Micha
-- 

Re: a few issues with qwtplot3d

[Micha B. <kri...@us...>]

Sunday, November 14, 2004, 17:29:33, Gerard Vermeulen wrote:

> Hi Micha,

> In the process of making Python bindings for QwtPlot3D, I have found the
> following (minor) problems:

> - your simpleplot program has a problem (which may only show up on X):

not generally - in fact, I never recognized this on any Linux system.

>   Uwe and I have the policy *not* to use tabs in Qwt (sometimes it happens,
>   though).

I agree, I think I 'll change it step by step in the CVS.

> - SurfacePlot::createNormals() is declared in the headers, but not defined.

Ooops ..

> - I do not like your definition of DataRows which leads to a lot of
>   allocations or double[3].  I would define DataRow as:
>   typedef DataRow std::vector<Triple>;

>   and abuse the fact that sizeof(Triple) == sizeof(double[3]).
>   IMO, it is not only more efficient but would also lead to cleaner code
>   in qwt3d_gridplot.cpp (if you like, I can send a patch).
>   (I am aware that GL vertices can be triplets or quadruplets, but that
>    is maybe something for the future).

I see the point. For this and similar reasons the internal data
structure is not public. This gives me the opportunity to change the
structure, if I need so. E.g., I was not sure in the beginning, if the
Triple struct needs additional features (your sizeof argument becomes false in
this case and it is so possibly also for the existing variant). BTW, I
still play with transparent surfaces and need the 4th argument for this.

> Just a few other ideas, since my problem of 3D plots on a 2D screen is that I cannot read
> off coordinates of a point on a surface:
> - Would it be possible to implement some cursor which moves on the surface (ctrl-x or ctrl-y
>   for positive x or y direction and alt-x or alt-y for negative x or y direction)?
> - Another type of "cursor" would be a plane parallel to the z-direction which cuts the
>   surface. The plane can have a direction parallel to any vector in the x-y plane and
>   have an offset with respect to the origin of the axes.

In fact, I had an implementation like this in a very early version of
qwtplot3d. Here, transparency came into the game (for the cutting plane
and also the respective data on every side of the plane). Also it is not
nailed down forever, that I will interpolate exclusively linearly
between data points. Which data values should the cursor return, if I
choose e.g a (nonlinear) spline interpolation? Eventually he has to be a
bit more intelligent resp. I have to give him some sort of information to
take with them. Finally - and most important - it is a design decision.
I always look for solutions to keep the widget free from too special
features (related also to your 'snappy' argument in the post scriptum
and a relatively small API in general). But I tend to agree, that
cutting planes qualify for more general support and I will see what I
can do here.

Micha  
-- 

PRE-ANNOUNCEMENT: Python bindings for QwtPlot3D

[Gerard V. <ger...@gr...>]

Hi,

PyQwt3D is a set of Python bindings for the QwtPlot3D ( http://qwtplot3d.sourceforge.net )
C++ class library which extends the Qt framework with widgets to visualize 3-dimensional data.

At this moment PyQwt3D is only available from CVS (when prompted for a password, press the
Enter key):

cvs -d:pserver:ano...@cv...:/cvsroot/pyqwt login 
cvs -z3 -d:pserver:ano...@cv...:/cvsroot/pyqwt co pyqwt3d 

or with CVSGrab ( http://cvsgrab.sourceforge.net ).

Feedback on the installation on other platforms than Linux and on the interfacing between the
QwtPlot3D API and the Numerical Python extensions is highly appreciated.

For more details, see the README:
http://cvs.sourceforge.net/viewcvs.py/pyqwt/pyqwt3d/README?rev=1.2&view=auto

I hope to produce a first release of PyQwt3D within a few weeks (it would be nice to
be sure that PyQwt3D is working on Windows).

Gerard

a few issues with qwtplot3d

[Gerard V. <ger...@gr...>]

Hi Micha,

In the process of making Python bindings for QwtPlot3D, I have found the
following (minor) problems:

- your simpleplot program has a problem (which may only show up on X):
  part of the axes frame and the whole title do not show up, until I
  resize the simpleplot widget manually.  I am pretty sure that it is
  some initialization problem, because if I comment the statement
  plot.resize(800, 600) from main(), everything looks OK.
  (strange that the surface does not get chopped off).

- it took me some time to see that for you a tab means 2 spaces (all my tools
  on Linux interpret a tab as 8 spaces and display only 80 characters per
  line, so your code is pretty hard to read -- viewcvs also is confused:
http://cvs.sourceforge.net/viewcvs.py/qwtplot3d/qwtplot3d/include/qwt3d_plot.h?rev=1.17&view=auto )
  Uwe and I have the policy *not* to use tabs in Qwt (sometimes it happens,
  though).

- SurfacePlot::createNormals() is declared in the headers, but not defined.

- I do not like your definition of DataRows which leads to a lot of
  allocations or double[3].  I would define DataRow as:
  typedef DataRow std::vector<Triple>;
  and abuse the fact that sizeof(Triple) == sizeof(double[3]).
  IMO, it is not only more efficient but would also lead to cleaner code
  in qwt3d_gridplot.cpp (if you like, I can send a patch).
  (I am aware that GL vertices can be triplets or quadruplets, but that
   is maybe something for the future).

Just a few other ideas, since my problem of 3D plots on a 2D screen is that I cannot read
off coordinates of a point on a surface:
- Would it be possible to implement some cursor which moves on the surface (ctrl-x or ctrl-y
  for positive x or y direction and alt-x or alt-y for negative x or y direction)?
- Another type of "cursor" would be a plane parallel to the z-direction which cuts the
  surface. The plane can have a direction parallel to any vector in the x-y plane and
  have an offset with respect to the origin of the axes.

Gerard

PS: OpenGL is new for me.  I am quite impressed with how snappy QwtPlot3D behaves
with respect to Vtk and its Python bindings.
    

Help needed

[Micha B. <kri...@us...>]

I'm currently on the way to fill the VolumePlot and GraphPlot skeleton
widgets with life. I appreciate any pointers to algorithms, code,
concise papers, whatever concerning esp. 3D graph layouting. The plan is
to implement an unintelligent GraphWidget, still flexible in offering
some degrees of freedom to the user regarding the visual appearance of
nodes, edges and related informations. Additionally an interface for
layout algorithms should be provided. At this moment I'm interested in
something what could be part of qwt3d in form of standard graph layout
algorithms.

TIA,

Micha
-- 

beginner..advice needed..!

[comp s. <com...@ya...>]

Sir,
     I just tried the examples in qwtplot3d and it was
really wonderful.Actually I use QT to dynamically
display graphs and update them in real-time using my
simulation results.
     In my scenario I just read file for x and y
values and update the graph in real-time as long as
there are new values in the file(i.e to say as long as
simulation is running).Now Iam just wondering whether
it will be possible to use this API exactly as
before..i.e to just call a method with x and y (z in
future) values continously,which would update the plot
as my simulation is running...
     Can any one plese provide me an example about how
to accomplish this basic task? Any simple example with
2 coordinates would be very helful for me to get
started in this regard.
     Thankyou.



		
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Re: How to change colours for single line

[Micha B. <kri...@us...>]

Friday, September 24, 2004, 15:20:45, Narahari shetty prasad wrote:

> hi Micha,

> I couldnt understand,Could u please give my some suggestion.
> Is it possible to change colors for single line using "Surfaceplot".

It isn't. The lines you have in mind are part of the mesh. Consider the
mesh as a visual object. This object has a single color for all his
lines. You can set it with Plot3D::setMeshColor and read it with
Plot3D::meshColor. Thats all, I had no intention in giving them more
flexibility. The power of color vectors or otherwise calculated colors
applies only to filled polygons and isolines, not to mesh lines. At
least this is the situation in the current version of qwtplot3d. It
might be, that the feature can be implemented yet with Enrichments
(check the manual the API documentation and the examples for this). If
not, I will provide an example in the next release of the library.

HIH,
Micha  
-- 

How to change colours for single line

[Narahari s. p. <pra...@re...>]

hi Micha,=0A=0AI couldnt understand,Could u please give my some suggestion.=
=0AIs it possible to change colors for single line using "Surfaceplot".=0A=
=0AThanks for u kind reply=0A=0ABest Regards=0Aprasad=0A=0A =0A  =0A

Re: How to change colours for single line

[Micha B. <kri...@us...>]

> i have a line ,i need to show with three different colours for a
> single line.but i am able to see only in black colour line .

The mesh lines are not subject to the color policy for polygons. You can
set only a single color with Plot3D::setMeshColor for the whole mesh (cf.
mesh2 example).

rgb->r =255

Take care. RGBA is double based. The range for the single components is
always [0..1].

Regards,
Micha

How to change colours for single line

[Narahari s. p. <pra...@re...>]

 =A0=0A =A0=0Ahi,=0A=0ACan some body help me,Thanks in advance=0A=0Ai have =
a line ,i need to show with three different colours for a single line.but i=
 am able to see only in black colour line .=0A=0Atotal lenght of line is 10=
00=0A=0Afrom x =3D 0 to x=3D 200 blue =0Afrom x =3D 500 to x=3D 700 red =0A=
from x =3D 900 to x=3D 1000 blue =0A=0A=0Ai have written some thing like th=
is=0A=0AColorVector cv(1000);=0ATripleField data;=0A=0A=0ATriple coord_1(x1=
,y1,z1);// diff x,y,z values=0Adata.push_back( coord_1 );=0Acf.push_back(c)=
;=0A=0Afor (int i=3D1; i <1000 ; i++)=0A{=0ARGBA *rgb =3D new RGBA ;=0Aif(i=
<=3D200)=0A{=0Argb->r =3D0 ; rgb->g=3D0; rgb->b=3D205;=0A}=0Aif(i>=3D500 &&=
 i<=3D700)=0A{=0Argb->r =3D255 ; rgb->g=3D0; rgb->b=3D0;=0A}=0A=0Aif(i>=3D9=
00 && i<=3D999)=0A{=0Argb->r =3D0 ; rgb->g=3D0; rgb->b=3D205;=0A}=0A=0Acv.p=
ush_back(*rgb); =0A}=0A=0AcreateDataRepresentation (data, cf,POLYGON );=0As=
etPlotStyle (HIDDENLINE);=0AsetMeshLineWidth (2);=0A//setMeshColor (RGBA(25=
5,0,0,1)); iam not using this it shows total line in red.=0AStandardColor* =
col =3D new StandardColor(this);=0Acol->setColorVector(cv);=0AsetDataColor(=
col);=0AsetCoordinateStyle(BOX);=0A=0AenableMouse(TRUE);=0AupdateData();=0A=
updateGL();=0A=0Athanks =0A

Re: Examples

[Micha B. <kri...@us...>]

Try this as an starting point. It should give you an idea how to set up
your data. The example produces a (skewed) tetrahedron. The essentials
are a field of points (pos in the example) and another one describing
polygons (cells). Actually a cell is a small vector containing a
polygons vertices in form of indices from the point field.
A cell has some usual restrictions: It has to be convex and it should be
specified as a single loop (point0 --> point1 --> ... pointN). The last
connection - closing the loop - is added automatically.

Micha


#include <qapplication.h>
#include <qwt3d_surfaceplot.h>
  
using namespace Qwt3D;

void createTetrahedron(Qwt3D::TripleField& pos, Qwt3D::CellField& poly)
{
  pos.clear(); poly.clear();
  Cell cell(3);
  
  pos.push_back(Triple(0,0,0));
  pos.push_back(Triple(1,0,0));
  pos.push_back(Triple(0.5,1,0));
  pos.push_back(Triple(0.5,0.7,1.5));

  cell[0] = 0; 
  cell[1] = 1; 
  cell[2] = 2; 
  poly.push_back(cell);
  
  cell[0] = 0; 
  cell[1] = 1; 
  cell[2] = 3; 
  poly.push_back(cell);

  cell[0] = 1; 
  cell[1] = 2; 
  cell[2] = 3; 
  poly.push_back(cell);

  cell[0] = 2; 
  cell[1] = 0; 
  cell[2] = 3; 
  poly.push_back(cell); 
}


int main(int argc, char **argv)
{
  QApplication a(argc, argv);

  SurfacePlot plot;
  TripleField pos;
  CellField poly;
  createCone(pos, poly);
  plot.loadFromData(pos, poly);
  plot.setRotation(30,0,15);
  for (unsigned i=0; i!=plot.coordinates()->axes.size(); ++i)
  {
    plot.coordinates()->axes[i].setMajors(4);
    plot.coordinates()->axes[i].setMinors(5);
  }

  a.setMainWidget(&plot);
  plot.resize(800,600);
  plot.show();
  return a.exec();
}

-- 

Examples

[Mahesh C. <dat...@ho...>]

Hi,
I just started exploring qwtplot3d. I was wondering if some one could, share 
the code for building free formed mesh, or explain steps to create my own 
mesh shape. And also, can you please provide me with few more examples, ( 
i'm a novice in graphics). Thankx for the help in advance.

-Mahesh.

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Examples

[Mahesh C. <dat...@ho...>]

Hi,
I just started exploring qwtplot3d. I was wondering if some one could, share 
the code for building free formed mesh, or explain steps to create my own 
mesh shape. And also, can you please provide me with few more examples, ( 
i'm a novice in graphics). Thankx for the help in advance.

-Mahesh.

_________________________________________________________________
Claim your Citibank Ready Cash today.  http://go.msnserver.com/IN/54177.asp 
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[qwtplot3d-interest] New release: QwtPlot3D 0.2.4 beta

[Michael B. <kri...@us...>]

A new version of QwtPlot3D is out:

New features:

    * Keyboard Handler
    * User-Definable I/O Functionality
    * Configurable 'Numbering'-Schemes (Letters, Date/Time, ...)
    * Nonlinear Scales (log, ...)

    * Forum open

Look at http://qwtplot3d.sourceforge.net/  for details.

Enjoy !

Micha
-- 

[qwtplot3d-interest] FASD project: Online survey launched

[<ben...@id...>]

Dear Open Source developer

I am doing a research project on "Fun and Software Development" in which I kindly invite you to participate.
You will find the online survey under http://fasd.ethz.ch/qsf/. The questionnaire consists of 53 questions and you will need about 15 minutes to complete it.

With the FASD project (Fun and Software Development) we want to define the motivational significance of fun when software developers decide to engage in Open Source projects. What is special about our research project is that a similar survey is planned with software developers in commercial firms. This procedure allows the immediate comparison between the involved individuals and the conditions of production of these two development models. Thus we hope to obtain substantial new insights to the phenomenon of Open Source Development.


With many thanks for your participation,
Benno Luthiger


PS:
The results of the survey will be published under http://www.isu.unizh.ch/fuehrung/blprojects/FASD/.
We have set up the mailing list fa...@we... for this study. Please see http://fasd.ethz.ch/qsf/mailinglist_en.html for registration to this mailing list.

_______________________________________________________________________

Benno Luthiger
Swiss Federal Institute of Technology Zurich
8092 Zurich

Mail: benno.luthiger(at)id.ethz.ch
_______________________________________________________________________

[qwtplot3d-interest] Forum

[Micha B. <kri...@us...>]

Hallo group,

due to the recently increased number of qwtplot3d questions per email I
unlocked the forum feature on the sourceforge site for quicker access:

https://sourceforge.net/forum/forum.php?forum_id=374844


Micha
--

[qwtplot3d-interest] Porting to Python

[Gregor L. <gre...@fr...>]

Hi,
 
I'm not familiar with QwtPlot3D so I don't know if it is possible, but I was
wodering would it be possible to port QwtPlot3D to Python? Like Qwt is
ported as PyQwt. Would that be hard to do? We, at the Laboratory for
Artificial Intelligence would be very intereseted to use it from Python in
our application called Orange.
 
Thanks,
Gregor
 

[qwtplot3d-interest] New release: QwtPlot3D 0.2.3 beta

[Micha B. <kri...@us...>]

A new version of QwtPlot3D is out:

New features:

    * User defined enhancements ("Enrichments")
    * User defined plotting styles
    * Standard point plot style (Enrichment based)
    * Lighting
    * Parametric Surfaces

Look at http://qwtplot3d.sourceforge.net/  for details.


Micha
-- 

Re: [qwtplot3d-interest] possible ideas...

[Micha B. <kri...@us...>]

Monday, March 8, 2004, 11:51:49, Piotr Golonka wrote:

PG> You might be interested in classes for drawing 3-D histograms and plots:
PG> (example screenshits included).

PG> http://root.cern.ch/root/html310/THistPainter.html


I'm always looking around for comparable software. Hints are therefore
always welcome! Some examples of new things implemented in the
upcoming version (like parametric surfaces) can be found here (mostly
not yet in CVS).

http://qwtplot3d.sourceforge.net/tmp.html


BTW, if someone has some really impressive screenshots, feel free to
contact me.


Micha   
--

[qwtplot3d-interest] possible ideas...

[Piotr G. <Pio...@ce...>]

Hi there!
Excellent project!
Just to provide references for possible new ideas, have a look at the project 
called "root" - it is a complete scientific framework in C++ developed at 
CERN, European Laboratory for High-Energy Physics and it origins from older 
analysis and visualization projects (e.g. in Fortran) called PAW (Physics 
Analysis Workstation).
Main page is at:
	http://root.cern.ch

You might be interested in classes for drawing 3-D histograms and plots:
(example screenshits included).

http://root.cern.ch/root/html310/THistPainter.html

best regards!
	Piotr Golonka
	CERN EP/ATR