MATLAB - adding additional data to surface plot tooltip

2020 11 5
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更新时间：2020 11 6
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I have created a cylinder with the help of a surface plot and a 360x512 matrix with some data(named map100).
When i put my cursor over the cylinder i see my X,Y,Z on the tooltip as expected. However i would also like to see the matrix(map100) value for that point on the tooltip as well. Is this possible ? and if so how?
Any help is much appreciated..

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回答（1 个）

Walter Roberson
Walter Roberson 2020-11-5

1 个投票

See https://www.mathworks.com/help/matlab/creating_plots/create-custom-data-tips.html for R2019a and later.
I just confirmed that surf() do have the needed property.

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Ali Shakeri
Ali Shakeri 2020-11-5
i see that but how do i extract the value from the map100 matrix for that point so i can display it?
Walter Roberson
Walter Roberson 2020-11-5
row = dataTipTextRow('m100', map100);
cyl.DataTipTemplate.DataTipRows(end+1) = row;
I think.
Ali Shakeri
Ali Shakeri 2020-11-5
i tried that and i get this error.
Error using matlab.graphics.datatip.DataTipTemplate/set.DataTipRows
{Value must be a string scalar or a character vector with the name of a data property, such as 'XData', or it must be a
vector or a function handle.
Error in createSurfCylinderFinal (line 36)
cyl.DataTipTemplate.DataTipRows(end+1) = row;}
im very confused
Walter Roberson
Walter Roberson 2020-11-5
Ran in:
Ran in:
Works for me when I try in R2020b.
z = randi(9, 30, 50);
map100 = sort(z) + randn(size(z));
cyl = surf(z);
row = dataTipTextRow('m100', map100);
cyl.DataTipTemplate.DataTipRows(end+1) = row;
Ali Shakeri
Ali Shakeri 2020-11-5
this is my map
function heat = getCylinderHeatMap(filename)
%Returns a struct with info about the file.
s = dir(filename);
%Opens a file for reading, hence the 'r'.
fin = fopen(filename,'r');
I=fread(fin,s.bytes,'uint8=>uint8');
w = uint16(I(1))+256*uint16(I(2));
h = uint16(I(3))+256*uint16(I(4));
skip = s.bytes - w*h + 1;
IN = I(skip:1:s.bytes);
Z=single(reshape(IN,w,h));
Z=griddedInterpolant(Z');
y_range = linspace(1.0,single(h),360);
x_range = linspace(1.0,single(w),512);
heat = uint8(Z({y_range, x_range}));
end
Walter Roberson
Walter Roberson 2020-11-6
I do not have your file or your input matrix to test with, and I posted demonstration code that showed that my approach works.
What is size(map100) ? It looks most likely to be 2D to me, but I cannot prove it from what has been posted.
You could try
row = dataTipTextRow('m100', 'map100');
cyl.DataTipTemplate.DataTipRows(end+1) = row;
Ali Shakeri
Ali Shakeri 2020-11-6
My workspace that stores all variables says map100 is a 360x512 uint8.
Walter Roberson
Walter Roberson 2020-11-6
Did you try my sample code? Did it work for you?

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