How do I select a region on a 3D plot and extract the indices of the enclosed points?

Question

pistachionut 2020-7-1

0
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https://ww2.mathworks.cn/matlabcentral/answers/558061-how-do-i-select-a-region-on-a-3d-plot-and-extract-the-indices-of-the-enclosed-points

回答： darova 2020-7-2

I have a series of x, y, and z data (let's call them x_data, y_data, z_data). I make a 3D plot using imagsc.

Now I want to make the resulting figure interactive such that I can select regions of this plot with my mouse and produce a 2D cut from my 3D image.

Right now I have a separate code, shown below, that does this. For examlple, to get a y-z cut at a certain value of x: I choose an x value, get an appropriate number of indices ("width") around that, get the corresponding z values, average them, and plot them against the corresponsing y values.

x = 600; 
width = 50;
x_cut = find(x+width/2>x_data & x-width/2<x_data);
z_cut = z_data(:,x_cut(1):x_cut(end));
z_cut_mean = mean(z_cut, 2);
figure; plot(y_data, z_cut_mean)

But I want to make this process an interactive one right on the 3D graph itself. I was thinking that if I could get the indices out with a selection tool somehow, I'd be able to use the code above from line 4 perhaps. Or somethig like that.

What is the best way to go baout doing somethig like this? Should I be looking itno making GUI's or is there a simpler way of extracting the indices I need from the graph?

Thanks!