source: trunk/src/set_col_vec.m @ 230

%'set_col_vec': sets the color code for vectors depending on a scalar vec_C and parameters given by the struct colcode
%function [colorlist,col_vec,minC,colcode1,colcode2,maxC]=colvec(colcode,vec_C)
%OUTPUT
%colorlist(nb,3); %list of nb colors
%col_vec, size=[length(vec_C),3)];%list of color indices corresponding to vec_C
%minC, maxC: min and max of vec_C
%colcode1, colcode2: absolute threshold in vec_C corresponding to colcode.colcode1 and colcode.colcode2
%INPUT
% colcode: struture setting the colorcode for vectors
            % colcode.CName: 'ima_cor','black','white',...
            % colcode.ColorCode ='black', 'white', 'rgb','brg', '64 colors'
            % colcode.FixedCbounds =0; thresholds scaling relative to min and max, =1 fixed thresholds
            % colcode.MinC; min 
            % colcode.MaxC; max
            % colcode.colcode1: first threshold for rgb, relative to min (0) and max (1)
            % colcode.colcode2: second threshold for rgb, relative to min (0) and max (1), 
            % rmq: we need min <= colcode1 <= colcode2 <= max, otherwise
            % colcode1 and colcode2 are adjusted to the bounds
% vec_C: matlab vector representing the scalar setting the color
function [colorlist,col_vec,colcode_out]=set_col_vec(colcode,vec_C)

col_vec=[]; 
colcode_out=colcode;%default
if isempty(vec_C) || ~isnumeric(vec_C)
    colorlist=[0 0 1]; %blue  
    col_vec=ones(size(vec_C));
    return
end
if (isfield(colcode,'FixedCbounds') && isequal(colcode.FixedCbounds,1))
    minC=colcode.MinC;
    maxC=colcode.MaxC;
else
    minC=min(vec_C);
    maxC=max(vec_C);
end

%default input parameters
if ~isstruct(colcode),colcode=[];end;
if ~isfield(colcode,'ColorCode') || isempty(colcode.ColorCode)
    colorlist=[0 0 1]; %blue  
    col_vec=ones(size(vec_C));
    return
end
if  isfield(colcode,'colcode1')
    colcode1=minC+colcode.colcode1*(maxC-minC);
else
    colcode1=minC+(maxC-minC)/3;%default
end
if isfield(colcode,'colcode2')
    colcode2=minC+colcode.colcode2*(maxC-minC);
else
    colcode2=minC+2*(maxC-minC)/3;%default
end
colcode_out.MinC=minC;
colcode_out.MaxC=maxC;
if strcmp(colcode.ColorCode,'black')
    colorlist(1,:)=[0 0 0];%black
    col_vec=ones(size(vec_C));%all vectors at color#1
elseif strcmp(colcode.ColorCode,'white')
    colorlist(1,:)=[1 1 1];%white
    col_vec=ones(size(vec_C));%all vectors at color#1
elseif strcmp(colcode.ColorCode,'rgb')|| strcmp(colcode.ColorCode,'bgr')% 3 color representation
    ind1=find(vec_C < colcode1); % =1 for red vectors
    ind_green=find((vec_C >= colcode1) & (vec_C < colcode2));% =1 for green vectors
    ind3=find(vec_C >= colcode2);% =1 for blue vectors
    colorlist(2,:)=[0 1 0];%green
    col_vec(ind1)=1;
    col_vec(ind_green)=2;
    col_vec(ind3)=3;
    if strcmp(colcode.ColorCode,'rgb')
        colorlist(1,:)=[1 0 0];%red
        colorlist(3,:)=[0 0 1];%blue
    else
        colorlist(1,:)=[0 0 1];%blue
        colorlist(3,:)=[1 0 0];%red
    end
else
    colorjet=jet;% ususal colormap from blue to red
    sizlist=size(colorjet);
    indsel=ceil((sizlist(1)/64)*(1:64));
    colorlist(:,1)=colorjet(indsel,1);
    colorlist(:,2)=colorjet(indsel,2);
    colorlist(:,3)=colorjet(indsel,3);
    sizlist=size(colorlist);
    nblevel=sizlist(1);
    col2_1=maxC-minC;
    col_vec=1+floor(nblevel*(vec_C-minC)/col2_1);
    col_vec=col_vec.*(col_vec<= nblevel)+nblevel*(col_vec >nblevel);% take color #nblevel at saturation
    col_vec=col_vec.*(col_vec>= 1)+  (col_vec <1);% take color #1 for values below 1
end