Error adding DataTipRows to patch/fill

I'm trying to add a new row to the data tip for some fill/patch regions in one of my plots.

I've successfully done the same thing to plot/scatter in the same figure, where the new row is a datetime.

Trying to do the same for a fill, I found I needed to first use datatip to create the correct field. It had previously been giving me the error:

"Unrecognized method, property, or field 'DataTipTemplate' for class 'matlab.graphics.primitive.Patch'."

Following this, the error has become:

"Error using matlab.graphics.datatip.DataTipTemplate/set.DataTipRows

Value must be compatible with the data source."

The current code I have is as follows, with angles/coords and times removed.

    figure;                                 %Produce figure
    
    LATLONG.F1   = [0 1 1 0; 1 0 0 1];      %2x4 array of angles, angles removed
    LATLONG.F2   = [0 1 1 0; 1 0 0 1];      %2x4 array of angles, angles removed
    LATLONG.F3   = [0 1 1 0; 1 0 0 1];      %2x4 array of angles, angles removed
    
    plot_colours = winter;                  %Prepare array of colour values to use
    
    t1           = [datetime('01-JAN-1970') datetime('01-JAN-1970') datetime('01-JAN-1970')]; %Datetime array, dates removed
    t2           = [datetime('02-JAN-1970') datetime('02-JAN-1970') datetime('02-JAN-1970')]; %Datetime array, dates removed
    
    field2       = fieldnames(LATLONG);     %Get list of all fields in struct
    
    for i   = 1:length(field2)              %For all fields, plot
        
        %Plot region
        plot2                                    = patch(LATLONG.(field2{i})(1,:),LATLONG.(field2{i})(2,:),plot_colours(10+5*(i-1),:),'FaceAlpha',0.05,'LineStyle','-.');
        
        %Generate datatip
        datatip(plot2,'Visible','off');
        
        %Create dataTipTextRows
        text_var1                                 = dataTipTextRow('Start time:',t1(i));
        text_var2                                 = dataTipTextRow('End time:',t2(i));
        
        %Add row to datatips
        plot2.DataTipTemplate.DataTipRows(end+1) = text_var1;   %ERROR OCCURS HERE
        plot2.DataTipTemplate.DataTipRows(end+1) = text_var2;
        
        %Update DisplayName for legend
        plot2.DisplayName                        = append('Session: ',field2{i});
    end

Error using matlab.graphics.datatip.DataTipTemplate/set.DataTipRows
Value must be compatible with the data source.

is there a way to get around this issue and have a row with a datetime in the datatip beneath the x/y coords?

Thanks.

Answer 1

[Simon Chan]

Try the following:

figure;                                 %Produce figure
LATLONG.F1   = [0 1 1 0; 1 0 0 1];      %2x4 array of angles, angles removed
LATLONG.F2   = [0 1 1 0; 1 0 0 1];      %2x4 array of angles, angles removed
LATLONG.F3   = [0 1 1 0; 1 0 0 1];      %2x4 array of angles, angles removed
plot_colours = winter;                  %Prepare array of colour values to use
field2       = fieldnames(LATLONG);     %Get list of all fields in struct
%
for i   = 1:length(field2)              %For all fields, plot
    plot2                                    = patch(LATLONG.(field2{i})(1,:),LATLONG.(field2{i})(2,:),plot_colours(10+5*(i-1),:),'FaceAlpha',0.05,'LineStyle','-.');
    %Generate datatip
    t1=repelem(datetime('01-JAN-1970'),1,size(plot2.Vertices,1));           % Matches the number of vertices
    t2=repelem(datetime('02-JAN-1970'),1,size(plot2.Vertices,1));           % Matches the number of vertices
    datatip(plot2,'Visible','off');

    %Create dataTipTextRows
    text_var1                                 = dataTipTextRow('Start time:',t1);
    text_var2                                 = dataTipTextRow('End time:',t2);

    %Add row to datatips
    plot2.DataTipTemplate.DataTipRows(end+1) = text_var1;   %ERROR OCCURS HERE
    plot2.DataTipTemplate.DataTipRows(end+1) = text_var2;

    %Update DisplayName for legend
    plot2.DisplayName                        = append('Session: ',field2{i});
end

[LS]

So "Value must be compatible with the data source" was wanting there to be an equal number of tooltip points to data points. One for each of the vertices.

Your solution works perfectly, thanks.