1 | %'mask_proj': restrict input fields to a mask region, set to 0 outside
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2 | %--------------------------------------------------------------------------
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3 | % function [ProjData,errormsg]=mask_proj(FieldData,MaskData)
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4 |
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5 | %=======================================================================
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6 | % Copyright 2008-2019, LEGI UMR 5519 / CNRS UGA G-INP, Grenoble, France
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7 | % http://www.legi.grenoble-inp.fr
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8 | % Joel.Sommeria - Joel.Sommeria (A) legi.cnrs.fr
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9 | %
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10 | % This file is part of the toolbox UVMAT.
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11 | %
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12 | % UVMAT is free software; you can redistribute it and/or modify
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13 | % it under the terms of the GNU General Public License as published
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14 | % by the Free Software Foundation; either version 2 of the license,
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15 | % or (at your option) any later version.
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16 | %
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17 | % UVMAT is distributed in the hope that it will be useful,
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18 | % but WITHOUT ANY WARRANTY; without even the implied warranty of
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19 | % MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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20 | % GNU General Public License (see LICENSE.txt) for more details.
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21 | %=======================================================================
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22 |
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23 | function [ProjData,errormsg]=mask_proj(FieldData,MaskData)
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24 | errormsg='';%default
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25 | ProjData=FieldData;
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26 |
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27 |
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28 | %% group the variables (fields of 'FieldData') in cells of variables with the same dimensions
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29 | [CellInfo,NbDimArray,errormsg]=find_field_cells(FieldData);
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30 | if ~isempty(errormsg)
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31 | errormsg=['error in proj_field/proj_plane:' errormsg];
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32 | return
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33 | end
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34 | [Npy,Npx]=size(MaskData.A);
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35 |
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36 | for icell=1:numel(CellInfo)
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37 | if NbDimArray(icell)==2
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38 | if isfield(CellInfo{icell},'VarIndex_errorflag')
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39 | FFName=FieldData.ListVarName{CellInfo{icell}.VarIndex_errorflag};
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40 | check_new_error_flag=0;
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41 | else
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42 | FFName='FF';%default error (mask) flag name (if not already used)
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43 | if isfield(FieldData,'FF')
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44 | ind=1;
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45 | while isfield(FieldData,['FF_' num2str(ind)])
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46 | ind=ind+1;
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47 | end
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48 | FFName=['FF_' num2str(ind)];% append an index to the name of error flag, FF_1,FF_2...
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49 | end
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50 | ProjData.ListVarName=[FieldData.ListVarName {FFName}];
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51 | ProjData.VarAttribute{numel(ProjData.ListVarName)}.Role='errorflag';
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52 | check_new_error_flag=1;
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53 | end
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54 | switch CellInfo{icell}.CoordType;
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55 | case 'scattered'
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56 | XName=FieldData.ListVarName{CellInfo{icell}.Coord_x};
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57 | YName=FieldData.ListVarName{CellInfo{icell}.Coord_y};
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58 | DX=(MaskData.Coord_x(2)-MaskData.Coord_x(1))/(Npx-1);
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59 | DY=(MaskData.Coord_y(2)-MaskData.Coord_y(1))/(Npy-1);
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60 | mask_ind_i=round(0.5+(FieldData.(XName)-MaskData.Coord_x(1))/DX);%nbpoint terms
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61 | mask_ind_j=round(0.5+(FieldData.(YName)-MaskData.Coord_y(1))/DY);%nbpoint terms
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62 | checkin=mask_ind_j+Npy*(mask_ind_i-1);%array of mask indices for the nbpoints
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63 | 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)
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64 | checkfalse=true(size(FieldData.(XName)));
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65 | MaskData.A=reshape(MaskData.A,1,[]);
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66 | checkfalse(MaskData.A(checkin)>200)=0;
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67 | for ivar=1:numel(CellInfo{icell}.VarIndex)
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68 | VarName=FieldData.ListVarName{CellInfo{icell}.VarIndex(ivar)};
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69 | ProjData.(VarName)(checkfalse)=0;
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70 | end
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71 | if check_new_error_flag% an error flag needs to be created in the current cell
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72 | ProjData.(FFName)=zeros(size(ProjData.(VarName)));
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73 | ProjData.VarDimName=[FieldData.VarDimName FieldData.VarDimName(CellInfo{icell}.VarIndex(1))];
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74 | end
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75 | ProjData.(FFName)(checkfalse)=1;% update the existing error flag
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76 | case 'grid'
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77 | XName=FieldData.ListVarName{CellInfo{icell}.CoordIndex(2)};
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78 | YName=FieldData.ListVarName{CellInfo{icell}.CoordIndex(1)};
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79 | Var1Name=FieldData.ListVarName{CellInfo{icell}.VarIndex(1)};
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80 | [Npy_field,Npx_field]=size(FieldData.(Var1Name));
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81 | XArray=linspace(FieldData.(XName)(1),FieldData.(XName)(end),Npx_field);
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82 | YArray=linspace(FieldData.(YName)(1),FieldData.(YName)(end),Npy_field);
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83 | XMask=linspace(MaskData.Coord_x(1),MaskData.Coord_x(end),Npx);
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84 | YMask=linspace(MaskData.Coord_y(1),MaskData.Coord_y(end),Npy);
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85 | [XMask,YMask]=meshgrid(XMask,YMask);
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86 | Mask = interp2(XMask,YMask,MaskData.A,XArray,YArray','nearest');
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87 | Mask=Mask>200;
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88 | for ivar=1:numel(CellInfo{icell}.VarIndex)
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89 | VarName=FieldData.ListVarName{CellInfo{icell}.VarIndex(ivar)};
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90 | if ~strcmp(VarName,FFName)
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91 | ProjData.(VarName)=FieldData.(VarName).*Mask;
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92 | end
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93 | end
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94 | if check_new_error_flag% an error flag needs to be created in the current cell
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95 | ProjData.(FFName)= ~Mask;
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96 | ProjData.VarDimName=[FieldData.VarDimName FieldData.VarDimName(CellInfo{icell}.VarIndex(1))];
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97 | else
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98 | ProjData.(FFName)=FieldData.(FFName) | ~Mask;
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99 | end
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100 | end
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101 | end
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102 | end
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103 |
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104 |
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