Probing a plot based on colormap information

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How can I probe a plot with colormap data?
As you see, in this case, it only shows the xyz coordinates which is not really useful. I want to be able to see the colormap value (between 0 and 1).
Any ideas? I am using the trisurf function.

Accepted Answer

Simon Chan
Simon Chan on 11 Mar 2022
Try function datatip & dataTipTextRow if your MATLAB version is after 2019b.
[x,y] = meshgrid(1:15,1:15);
z = peaks(15);
T = delaunay(x,y);
s = trisurf(T,x,y,z);
dt = datatip(s);
s.DataTipTemplate.DataTipRows(end+1) = dataTipTextRow('Colormap Value',T,'%.1f');
Simon Chan
Simon Chan on 11 Mar 2022
Add another line :-)
s.DataTipTemplate.DataTipRows(end+1) = dataTipTextRow('Colormap Value',repmat(s.CData,1,3),'%.3f');
s.DataTipTemplate.DataTipRows(1:3)=[]; % Add this line as well

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More Answers (1)

KSSV on 10 Mar 2022
I don't think you would be able to see the values like that. But you can see what value it has using:
F = scatteredInterpolant(x,y,z,c) ;
ci = F(xi,yi,zi) ; % where xi, yi, zi is the picked point
Simon Chan
Simon Chan on 10 Mar 2022
Choose figure object
f = figure;
ax = gca;
d = datacursormode(f)
d =
DataCursorManager with properties: SnapToDataVertex: on DisplayStyle: 'datatip' DefaultExportVarName: 'cursor_info' Interpreter: 'tex' UpdateFcn: [] Enable: off Figure: [1×1 Figure]
d2 = datacursormode(ax)
Error using datacursormode (line 154)
Invalid figure handle
Pelajar UM
Pelajar UM on 10 Mar 2022
Thanks, but how do you get the figure object of an UIAxes in app designer?
trisurf(F,P(:,1),P(:,2),P(:,3), flow12, 'Parent', app.UIAxes2_10);
c = colorbar(app.UIAxes2_10);
caxis(app.UIAxes2_10,[0.333 1]);
colormap(app.UIAxes2_10, jet);
c.Label.String = 'T11 Tensor';
On another note, there seems to be a way to modify the data tip function, but I don't really know how to implement customized functions in app designer:

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