source: trunk/src/mask_proj.m @ 690

Last change on this file since 690 was 675, checked in by sommeria, 11 years ago

various bugs corrected

File size: 5.3 KB
Line 
1%'mask_proj': restrict input fields to a mask region, set to 0 outside
2%--------------------------------------------------------------------------
3%  function [ProjData,errormsg]=mask_proj(FieldData,MaskData)
4%
5%AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
6%  Copyright Joel Sommeria, 2008, LEGI / CNRS-UJF-INPG, sommeria@coriolis-legi.org.
7%AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
8%     This file is part of the toolbox UVMAT.
9%
10%     UVMAT is free software; you can redistribute it and/or modify
11%     it under the terms of the GNU General Public License as published by
12%     the Free Software Foundation; either version 2 of the License, or
13%     (at your option) any later version.
14%
15%     UVMAT is distributed in the hope that it will be useful,
16%     but WITHOUT ANY WARRANTY; without even the implied warranty of
17%     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
18%     GNU General Public License (file UVMAT/COPYING.txt) for more details.
19%AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
20
21function [ProjData,errormsg]=mask_proj(FieldData,MaskData)
22errormsg='';%default
23ProjData=FieldData;
24
25
26%% group the variables (fields of 'FieldData') in cells of variables with the same dimensions
27[CellInfo,NbDimArray,errormsg]=find_field_cells(FieldData);
28if ~isempty(errormsg)
29    errormsg=['error in proj_field/proj_plane:' errormsg];
30    return
31end
32[Npy,Npx]=size(MaskData.A);
33
34for icell=1:numel(CellInfo)
35    if NbDimArray(icell)==2
36        if isfield(CellInfo{icell},'VarIndex_errorflag')
37            FFName=FieldData.ListVarName{CellInfo{icell}.VarIndex_errorflag};
38            check_new_error_flag=0;
39        else
40            FFName='FF';%default error (mask) flag name (if not already used)
41            if isfield(FieldData,'FF')
42                ind=1;
43                while isfield(FieldData,['FF_' num2str(ind)])
44                    ind=ind+1;
45                end
46                FFName=['FF_' num2str(ind)];% append an index to the name of error flag, FF_1,FF_2...
47            end
48            ProjData.ListVarName=[FieldData.ListVarName {FFName}];
49            ProjData.VarAttribute{numel(ProjData.ListVarName)}.Role='errorflag';
50            check_new_error_flag=1;
51        end
52        switch CellInfo{icell}.CoordType;
53            case  'scattered'   
54                XName=FieldData.ListVarName{CellInfo{icell}.Coord_x};
55                YName=FieldData.ListVarName{CellInfo{icell}.Coord_y};
56                DX=(MaskData.AX(2)-MaskData.AX(1))/(Npx-1);
57                DY=(MaskData.AY(2)-MaskData.AY(1))/(Npy-1);
58                mask_ind_i=round(0.5+(FieldData.(XName)-MaskData.AX(1))/DX);%nbpoint terms
59                mask_ind_j=round(0.5+(FieldData.(YName)-MaskData.AY(1))/DY);%nbpoint terms
60                checkin=mask_ind_j+Npy*(mask_ind_i-1);%array  of mask indices for the nbpoints
61                checkin=checkin(mask_ind_i>=1 & mask_ind_i<=Npx & mask_ind_j>=1 & mask_ind_j<=Npy);%reduced array  of mask indices (inside the image)
62                checkfalse=true(size(FieldData.(XName)));
63                MaskData.A=reshape(MaskData.A,1,[]);
64                checkfalse(MaskData.A(checkin)>200)=0;
65                for ivar=1:numel(CellInfo{icell}.VarIndex)
66                    VarName=FieldData.ListVarName{CellInfo{icell}.VarIndex(ivar)};
67                    ProjData.(VarName)(checkfalse)=0;
68                end
69                if check_new_error_flag% an error flag needs to be created in the current cell
70                    ProjData.(FFName)=zeros(size(ProjData.(VarName)));
71                    ProjData.VarDimName=[FieldData.VarDimName FieldData.VarDimName(CellInfo{icell}.VarIndex(1))];
72                end
73                ProjData.(FFName)(checkfalse)=1;% update the existing error flag             
74            case  'grid'
75                XName=FieldData.ListVarName{CellInfo{icell}.CoordIndex(2)};
76                YName=FieldData.ListVarName{CellInfo{icell}.CoordIndex(1)};
77                Var1Name=FieldData.ListVarName{CellInfo{icell}.VarIndex(1)};
78                [Npy_field,Npx_field]=size(FieldData.(Var1Name));
79                XArray=linspace(FieldData.(XName)(1),FieldData.(XName)(end),Npx_field);
80                YArray=linspace(FieldData.(YName)(1),FieldData.(YName)(end),Npy_field);
81                XMask=linspace(MaskData.AX(1),MaskData.AX(end),Npx);
82                YMask=linspace(MaskData.AY(1),MaskData.AY(end),Npy);
83                [XMask,YMask]=meshgrid(XMask,YMask);
84                Mask = interp2(XMask,YMask,MaskData.A,XArray,YArray','nearest');
85                Mask=Mask>200;               
86                for ivar=1:numel(CellInfo{icell}.VarIndex)
87                    VarName=FieldData.ListVarName{CellInfo{icell}.VarIndex(ivar)};
88                    if ~strcmp(VarName,FFName)
89                        ProjData.(VarName)=FieldData.(VarName).*Mask;
90                    end
91                end
92                if check_new_error_flag% an error flag needs to be created in the current cell
93                    ProjData.(FFName)= ~Mask;
94                    ProjData.VarDimName=[FieldData.VarDimName FieldData.VarDimName(CellInfo{icell}.VarIndex(1))];
95                else
96                    ProjData.(FFName)=FieldData.(FFName) | ~Mask;
97                end
98        end
99    end
100end
101
102
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