data cursor function for 3D slice

Question

A 2012-4-16

1
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/35633-data-cursor-function-for-3d-slice

I need to make the data cursor on a 3D slice display value of the function being displayed; i.e. for slice(X,Y,Z,f,0,[],[]) make data cursor display value of f. Can you suggest a code to do that?

more example:

[X Y Z]=meshgrid([-2:.1:2],[-2:.1:2],[-2:.1:2]);
f=rand(41,41,41);
slice(X,Y,Z,f,0,[],[])

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Answer 1

Sean de Wolski 2012-4-16

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/35633-data-cursor-function-for-3d-slice#answer_44609

在 MATLAB Online 中打开

Use datacursormode and set a your own updatefcn to display the value.

doc datacursormode

Provide us with a small example for more specific assistance.

More per example

function dcmmode_example
[X Y Z]=meshgrid([-2:.1:2],[-2:.1:2],[-2:.1:2]); 
f=rand(41,41,41);
slice(X,Y,Z,f,0,[],[]) 
dcm_obj = datacursormode(gcf); %datacursor mode on
set(dcm_obj,'enable','on','updatefcn',{@updateMe X Y Z f}) %update, need X,Y,Z, f-values
function msg = updateMe(src,evt,X,Y,Z,f)
evt = get(evt); %what's happenin'?
pos = evt.Position; %position
fval = f(X==pos(1)&Y==pos(2)&Z==pos(3)); %where?
msg = num2str(fval); %create msg

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Answer 2

A 2012-4-16

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/35633-data-cursor-function-for-3d-slice#answer_44640

that worked... thanks

Total longshot, but is there a way to draw a line across the slice and plot the line profile? (i.e. have it open a new figure and plot values of f across that line)

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A 2012-4-18

let me rephrase the question... I need the user to be able to draw an arbitrary line on the slice figure and have matlab plot magnitude of f along that line.