source: trunk/src/read_field.m @ 442

%'read_field': read input fields in different formats
%--------------------------------------------------------------------------
%  function [Field,ParamOut,errormsg] = read_field(ObjectName,FileType,ParamIn)
%
% OUTPUT:
% Field: matlab structure representing the field
% ParamOut: structure representing parameters:
%        .FieldName; field name
%        .FieldList: menu of possible fields
%        .VelType
%        .CivStage: stage of civx processing (=0, not Civx, =1 (civ1), =2  (fix1)....     
%        .Npx,.Npy: for images, nbre of pixels in x and y
% errormsg: error message, ='' by default
%
%INPUT
% ObjectName: name of the input file, or movie object when the Matlab function mmreader is used
% FileType: type of file
%     = netcdf : netcdf file 
%     = image : usual image as recognised by Matlab
%     = multimage: image series stored in a single file
%     = mmreader: movie read with mmreader
%     = video: movie read with VideoReader (recent versions of Matlab)
%     = vol: images representing scanned volume (images concatened in the y direction)
% ParamIn: Matlab structure of input parameters
%     .FieldName: name of the input field (for Civx data)
%     .VelType: type of velocity data ('civ1', 'filter1', 'civ2'...)
%     .ColorVar: variable used for vector color
%     .Npx, .Npy: nbre of pixels along x and y (used for .vol input files)
function [Field,ParamOut,errormsg] = read_field(ObjectName,FileType,ParamIn,num)
Field=[];
if ~exist('num','var')
    num=1;
end
if ~exist('ParamIn','var')
    ParamIn=[];
end
ParamOut=ParamIn;%default
errormsg='';
if isfield(ParamIn,'VelType')
VelType=ParamIn.VelType;
end
A=[];
%% distingush different input file types
switch FileType
    case {'civx','civdata','netcdf'}  %read the first nc field
%         ParamOut.FieldName=ParamIn.FieldName;
        GUIName='get_field'; %default name of the GUI get_field
        if isfield(ParamIn,'GUIName')
            GUIName=ParamIn.GUIName;
        end
        CivStage=0;
        if ~strcmp(ParamIn.FieldName,'get_field...')% if get_field is not requested, look for Civx data
            FieldList=calc_field;%list of possible fields for Civx data
            ParamOut.ColorVar='';%default
            field_index=strcmp(ParamIn.FieldName,FieldList);%look for ParamIn.FieldName in the list of possible fields for Civx data
            if isempty(find(field_index,1))% ParamIn.FieldName is not in the list, check whether Civx data exist
                Data=nc2struct(ObjectName,'ListGlobalAttribute','Conventions','absolut_time_T0','civ','CivStage');
                % case of new civdata conventions
                if isequal(Data.Conventions,'uvmat/civdata')
                    ParamOut.FieldName='velocity';%Civx data found, set .FieldName='velocity' by default
                    ParamOut.ColorVar='ima_cor';
                    InputField=[{ParamOut.FieldName} {ParamOut.ColorVar}];
                    [Field,ParamOut.VelType,errormsg]=read_civdata(ObjectName,InputField,ParamIn.VelType,Data.CivStage);
                    CivStage=Field.CivStage;
                    ParamOut.CivStage=Field.CivStage;
                    %case of old civx conventions
                elseif ~isempty(Data.absolut_time_T0)&& ~isequal(Data.civ,0)
                    ParamOut.FieldName='velocity';%Civx data found, set .FieldName='velocity' by default
                    ParamOut.ColorVar='ima_cor';
                    InputField=[{ParamOut.FieldName} {ParamOut.ColorVar}];
                    [Field,ParamOut.VelType]=read_civxdata(ObjectName,InputField,ParamIn.VelType);
                    CivStage=Field.CivStage;
                    ParamOut.CivStage=Field.CivStage;
                    % not cvix file, fields will be chosen through the GUI get_field
                else
                    ParamOut.FieldName='get_field...';
                    hget_field=findobj(allchild(0),'Name',GUIName);%find the get_field... GUI
                    if ~isempty(hget_field)
                        delete(hget_field)%delete  get_field for reinitialisation
                    end
                end
            else
                InputField={ParamOut.FieldName};
                if isfield(ParamIn,'ColorVar')
                    ParamOut.ColorVar=ParamIn.ColorVar;
                    InputField=[InputField {ParamOut.ColorVar}];
                end
                [Field,ParamOut.VelType,errormsg]=read_civxdata(ObjectName,InputField,ParamIn.VelType);
                if ~isempty(errormsg)
                    return
                end
                CivStage=Field.CivStage;
                ParamOut.CivStage=Field.CivStage;
            end
            ParamOut.FieldList=[{'image'};FieldList;{'get_field...'}];
        end
%         ParamOut.FieldList=[{'image'};FieldList;{'get_field...'}];
        if CivStage==0% read the field names on the interface get_field.
            hget_field=findobj(allchild(0),'Name',GUIName);%find the get_field... GUI
            if isempty(hget_field)% open the GUI get_field if it is not found
                hget_field= get_field(ObjectName);%open the get_field GUI
                set(hget_field,'Name',GUIName)%update the name of get_field (e.g. get_field_1)
            end
            hhget_field=guidata(hget_field);
            %% update  the get_field GUI
            set(hhget_field.inputfile,'String',ObjectName)
            set(hhget_field.list_fig,'Value',1)
            if exist('num','var')&&~isnan(num)
                set(hhget_field.TimeIndexValue,'String',num2str(num))
            end
            funct_list=get(hhget_field.ACTION,'UserData');
            funct_index=get(hhget_field.ACTION,'Value');
            funct=funct_list{funct_index};%select  the current action in get_field, e;g. PLOT
            Field=funct(hget_field); %%activate the current action selected in get_field, e;g.read the names of the variables to plot
            Tabchar={''};%default
            Tabcell=[];
            set(hhget_field.inputfile,'String',ObjectName)
            if isfield(Field,'ListGlobalAttribute')&& ~isempty(Field.ListGlobalAttribute)
                for iline=1:length(Field.ListGlobalAttribute)
                    Tabcell{iline,1}=Field.ListGlobalAttribute{iline};
                    if isfield(Field, Field.ListGlobalAttribute{iline})
                        eval(['val=Field.' Field.ListGlobalAttribute{iline} ';'])
                        if ischar(val);
                            Tabcell{iline,2}=val;
                        else
                            Tabcell{iline,2}=num2str(val);
                        end
                    end
                end
                if ~isempty(Tabcell)
                    Tabchar=cell2tab(Tabcell,'=');
                    Tabchar=[{''};Tabchar];
                end
            end
            %set(hhget_field.attributes,'String',Tabchar);%update list of global attributes in get_field
            ParamOut.CivStage=0;
            ParamOut.VelType=[];
            if isfield(Field,'TimeIndex')
                ParamOut.TimeIndex=Field.TimeIndex;
            end
            if isfield(Field,'TimeValue')
                ParamOut.TimeValue=Field.TimeValue;
            end
            ParamOut.FieldList={'get_field...'};
        end
%         if CivStage~=0
%             ParamOut.FieldList=[{'image'};FieldList;{'get_field...'}];
%         else
% %             ParamOut.FieldList={'get_field...'};
%         end    
    case {'video','mmreader'}
        try
            A=read(ObjectName,num);
        catch ME
            errormsg=ME.message;
            return
        end
        FieldName='image';
    case 'vol'
        A=imread(ObjectName);
        Npz=size(A,1)/ParamIn.Npy;
        A=reshape(A',ParamIn.Npx,ParamIn.Npy,Npz);
        A=permute(A,[3 2 1]);
        FieldName='image';
    case 'multimage'
        A=imread(ObjectName,num);
        FieldName='image';
    case 'image'
        A=imread(ObjectName);
        FieldName='image';
end
%% case of image
if ~isempty(A)
    ParamOut.FieldName='image';
    ParamOut.FieldList={'image'};
    Npz=1;%default
    npxy=size(A);
%     Rangx=[0.5 npxy(2)-0.5]; % coordinates of the first and last pixel centers
%     Rangy=[npxy(1)-0.5 0.5]; %
    Field.NbDim=2;%default
    Field.AName='image';
    Field.ListVarName={'AY','AX','A'}; %
    if ndims(A)==3
        if Npz==1;%color
            Field.VarDimName={'AY','AX',{'AY','AX','rgb'}}; %
            Field.AY=[npxy(1)-0.5 0.5];
            Field.AX=[0.5 npxy(2)-0.5]; % coordinates of the first and last pixel centers
            ParamOut.Npx=npxy(2);% display image size on the interface
            ParamOut.Npy=npxy(1);
            Field.VarAttribute{3}.Mesh=1;
        else
            Field.NbDim=3;
            Field.ListVarName=['AZ' Field.ListVarName];
            Field.VarDimName={'AZ','AY','AX',{'AZ','AY','AX'}};
            Field.AZ=[npxy(1)-0.5 0.5];
            Field.AY=[npxy(2)-0.5 0.5];
            Field.AX=[0.5 npxy(3)-0.5]; % coordinates of the first and last pixel centers
            ParamOut.Npx=npxy(3);% display image size on the interface
            ParamOut.Npy=npxy(2);
            Field.VarAttribute{4}.Mesh=1;
        end
    else
        Field.VarDimName={'AY','AX',{'AY','AX'}}; %
        Field.AY=[npxy(1)-0.5 0.5];
        Field.AX=[0.5 npxy(2)-0.5]; % coordinates of the first and last pixel centers
        ParamOut.Npx=npxy(2);% display image size on the interface
        ParamOut.Npy=npxy(1);
        Field.VarAttribute{3}.Mesh=1;
    end
    Field.A=A;
    Field.CoordUnit='pixel'; %used for mouse_motion
end