[Scilab-users] Scilab and gmsh to plot surfaces

[Carrico, Paul]

Dear All

After a tesselation using cgal library (delaunay_2), I used gmsh 
(http://gmsh.info/) to plot the triangles ... just an idea of sharing about 2 
powerful tools :-)
(useful with a huge amount of nodes)

A basic "saddle" surface has been used to test it

Hope it help

Paul

###
clc, mode(0), clear

PATH = get_absolute_file_path("saddle.sce");
fich = mopen(PATH + "/saddle.msh","w");

// saddle surface
function [z]=saddle(x, y)
z = x^2 - y^2
endfunction

n = 100;
x = linspace(-2,2,n)'; // (n,1) matrix
y = linspace(-1,3,n)'; // (n,1) matrix

i = (1:n)'; j = ones(n,1);
X = x .*. j;
Y = j .*. y;
Z = saddle(X,Y);

// ### plot in gmsh ###
// Surface number
SurfaceNumber = 1;

//tri = delaunay_2(X,Y);
triangles = delaunay_2(X',Y');
NumberOfTriangles = size(triangles,"r");

mfprintf(fich,"$MeshFormat\n");
mfprintf(fich,"2.2 0 8\n");
mfprintf(fich,"$EndMeshFormat\n");
// Nodes
mfprintf(fich,"$Nodes\n");
mfprintf(fich,"%d\n",n*n);
i = (1:n*n)';
mfprintf(fich,"%d %g %g %g\n",i,X(i),Y(i),Z(i));
mfprintf(fich,"$EndNodes\n");

// elements
mfprintf(fich,"$Elements\n")
mfprintf(fich,"%d\n",NumberOfTriangles);
i = (1 : NumberOfTriangles)';
SurfaceNumber = SurfaceNumber*ones(NumberOfTriangles,1);
mfprintf(fich,"%d 2 2 %d %d %d %d 
%d\n",i,SurfaceNumber,SurfaceNumber,triangles(i,1),triangles(i,2),triangles(i,3));
mfprintf(fich,"$EndElements\n")
mclose(fich);

// ### plot in scilab ###
scf(0);
drawlater();
f = gcf();
f.figure_size = [1000, 1000];
f.background = color(255,255,255);
a = gca();
a.font_size = 2;
a.x_label.text = '$X$';
a.x_label.font_size = 4;
a.y_label.text = '$Y$';
a.Y_label.font_size = 4;
a.z_label.text = "$\sigma$";
a.z_label.font_size = 4;
plot3d(x, y, feval(x, y, saddle));
drawnow();

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Re: [Scilab-users] question on graphic children order

[RolandB]

Hi,

> After the first interesting Stéphane's attempt, i am also afraid that
> changing the order now would break a lot of code. 

It would definitely break a lot of my code.
So if that behaviour would be changed, I would ask for an announcement
lng before it is taking effect.

If you want to index the children in the order they have been created, you
may use ($+1-creationindex).

IMO also the order different children are drawn (polylines...) depends on
their index. They are drawn from $ to 1 so that child 1, which is the most
recent one, is drawn on top.

Regards,
Roland




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Re: [Scilab-users] (no subject)

[RolandB]

This is a test. Please excuse me for hijacking this empty thread.



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Re: [Scilab-users] [EXTERNAL] Re: plots remain white under CentOS (redhat based OS) and Scilab 6.0.2

[Carrico, Paul]

I’m under CentOS Linux release 7.6.1810 (Core) where all the updates have been 
done … issue with a graphical library?



De : users [mailto:users-boun...@lists.scilab.org] De la part de Adelson 
Oliveira
Envoyé : jeudi 27 juin 2019 11:23
À : International users mailing list for Scilab.
Objet : [EXTERNAL] Re: [Scilab-users] plots remain white under CentOS (redhat 
based OS) and Scilab 6.0.2

Doesn't happen with Scilab 6.01 and Centos 6.9. I'll try with Scilab 6.02.

Em qui, 27 de jun de 2019 5:46 AM, Carrico, Paul 
mailto:paul.carr...@auxitrolweston.com>> 
escreveu:
Dear All

When I’m trying to use either plot2D or plot3D under CentOS, all the figures 
remains white ; I guess it’s a library issue and I think it has ever been 
noticed in the past, but I do not remember what or I cannot find the 
workaround: what it is?

Thanks for your help

Paul
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Re: [Scilab-users] plots remain white under CentOS (redhat based OS) and Scilab 6.0.2

[Adelson Oliveira]

Doesn't happen with Scilab 6.01 and Centos 6.9. I'll try with Scilab 6.02.

Em qui, 27 de jun de 2019 5:46 AM, Carrico, Paul <
paul.carr...@auxitrolweston.com> escreveu:

> Dear All
>
>
>
> When I’m trying to use either plot2D or plot3D under CentOS, all the
> figures remains white ; I guess it’s a library issue and I think it has
> ever been noticed in the past, but I do not remember what or I cannot find
> the workaround: what it is?
>
>
>
> Thanks for your help
>
>
>
> Paul
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>
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[Scilab-users] plots remain white under CentOS (redhat based OS) and Scilab 6.0.2

[Carrico, Paul]

Dear All

When I'm trying to use either plot2D or plot3D under CentOS, all the figures 
remains white ; I guess it's a library issue and I think it has ever been 
noticed in the past, but I do not remember what or I cannot find the 
workaround: what it is?

Thanks for your help

Paul
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