source: trunk/src/find_field_bounds.m @ 871

Last change on this file since 871 was 871, checked in by sommeria, 6 years ago

histo improved

File size: 4.2 KB
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1%'find_field_bounds': % find the bounds and typical meshs of coordinates
2%-----------------------------------------------------------------------
3%function  FieldOut=find_field_bounds(Field)
4%-----------------------------------------------------------------------
5%OUTPUT
6%FieldOut copy of the input Field with the additional items:
7%  .XMin,.XMax,.YMin,.YMax,bounds for x and y
8%  .CoordMesh: typical mesh needed for automatic grids
9%
10%INPUT
11% Field: Matlab structure describing the input field
12%
13%=======================================================================
14% Copyright 2008-2014, LEGI UMR 5519 / CNRS UJF G-INP, Grenoble, France
15%   http://www.legi.grenoble-inp.fr
16%   Joel.Sommeria - Joel.Sommeria (A) legi.cnrs.fr
17%
18%     This file is part of the toolbox UVMAT.
19%
20%     UVMAT is free software; you can redistribute it and/or modify
21%     it under the terms of the GNU General Public License as published
22%     by the Free Software Foundation; either version 2 of the license,
23%     or (at your option) any later version.
24%
25%     UVMAT is distributed in the hope that it will be useful,
26%     but WITHOUT ANY WARRANTY; without even the implied warranty of
27%     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
28%     GNU General Public License (see LICENSE.txt) for more details.
29%=======================================================================
30
31function FieldOut=find_field_bounds(Field)
32
33FieldOut=Field;%default
34%% analyse input field
35[CellInfo,NbDimArray,errormsg]=find_field_cells(Field);% analyse  the input field structure
36if ~isempty(errormsg)
37    errormsg=['uvmat /refresh_field / find_field_cells / ' errormsg];% display error
38    return
39end
40
41NbDim=max(NbDimArray);% spatial dimension of the input field
42imax=find(NbDimArray==NbDim);% indices of field cells to consider
43FieldOut.NbDim=NbDim;
44if  NbDim<=1; return; end% stop here for 1D fields
45
46%% get bounds and mesh (needed  to propose default options for projection objects)
47% if NbDim>1
48CoordMax=zeros(numel(imax),NbDim);
49CoordMin=zeros(numel(imax),NbDim);
50Mesh=zeros(1,numel(imax));
51for ind=1:numel(imax)
52    if strcmp(CellInfo{imax(ind)}.CoordType,'tps')
53        CoordName=Field.ListVarName{CellInfo{imax(ind)}.CoordIndex};% X,Y coordinates in a single variable
54        CoordMax(ind,NbDim)=max(max(Field.(CoordName)(1:end-3,1,:),[],1),[],3);% max of x component (2D case)
55        CoordMax(ind,NbDim-1)=max(max(Field.(CoordName)(1:end-3,2,:),[],1),[],3);% max of y component (2D case)
56        CoordMin(ind,NbDim)=min(min(Field.(CoordName)(1:end-3,1,:),[],1),[],3);
57        CoordMin(ind,NbDim-1)=min(min(Field.(CoordName)(1:end-3,2,:),[],1),[],3);% min of y component (2D case)
58    else
59        XName=Field.ListVarName{CellInfo{imax(ind)}.CoordIndex(end)};
60        YName=Field.ListVarName{CellInfo{imax(ind)}.CoordIndex(end-1)};
61        CoordMax(ind,NbDim)=max(max(Field.(XName)));
62        CoordMin(ind,NbDim)=min(min(Field.(XName)));
63        CoordMax(ind,NbDim-1)=max(max(Field.(YName)));
64        CoordMin(ind,NbDim-1)=min(min(Field.(YName)));
65        %         test_x=1;%test for unstructured coordinates
66        if NbDim==3
67            ZName=Field.ListVarName{CellInfo{imax(ind)}.CoordIndex(1)};
68            CoordMax(ind,1)=max(max(Field.(ZName)));
69            CoordMin(ind,1)=min(min(Field.(ZName)));
70        end
71    end
72    switch CellInfo{imax(ind)}.CoordType
73       
74        case {'scattered','tps'} %unstructured coordinates
75            NbPoints=CellInfo{imax(ind)}.CoordSize;% total nbre of points
76            Mesh(ind)=(prod(CoordMax(ind,:)-CoordMin(ind,:))/NbPoints)^(1/NbDim); %(volume or area per point)^(1/NbDim)
77        case 'grid'%structured coordinate
78            NbPoints=CellInfo{imax(ind)}.CoordSize;% nbre of points in each direction
79            Mesh(ind)=min((CoordMax(ind,:)-CoordMin(ind,:))./(NbPoints-1));
80    end
81end
82Mesh=min(Mesh);
83FieldOut.XMax=max(CoordMax(:,end));
84FieldOut.XMin=min(CoordMin(:,end));
85FieldOut.YMax=max(CoordMax(:,end-1));
86FieldOut.YMin=min(CoordMin(:,end-1));
87if NbDim==3
88    FieldOut.ZMax=max(CoordMax(ind,1));
89    FieldOut.ZMin=min(CoordMin(ind,1));
90end
91% adjust the mesh to a value 1, 2 , 5 *10^n
92ord=10^(floor(log10(Mesh)));%order of magnitude
93if Mesh/ord>=5
94    FieldOut.CoordMesh=5*ord;
95elseif Mesh/ord>=2
96    FieldOut.CoordMesh=2*ord;
97else
98    FieldOut.CoordMesh=ord;
99end
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