How to make zoom in and zoom out functions of a figure work in this situation?

Question

Leon 2020-1-21

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https://ww2.mathworks.cn/matlabcentral/answers/501359-how-to-make-zoom-in-and-zoom-out-functions-of-a-figure-work-in-this-situation

评论： Adam Danz 2020-1-22

I have some x and y values that differ a lot in terms of their ranges. For example, the x values could be

-0.03
-0.02
0
0.01
0.03

but the y values could be

I need to make an x-y plot and let users pinpoint the data points, by using the below coding:

pt = event.IntersectionPoint

Long story short. The above program will be dysfunctional in this case because x and y ranges have such big differences. What I did was to first multiply all the x values with a factor, in this case 100000 before plotting. I then changed the x-axis labels using the below script:

xt  = xticks(han01);
for i=1:length(xt)
    xt2{i} = num2str(xt(i)/100000);
end
set(han01,'xtickLabel',xt2);

Now, everything works great, except that the zoom in/zoom out functions of the plots are now messed up. Anyone knows how to make the zoom in / zoom out functions work in this situation?

Many thanks!

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Leon 2020-1-22

在 MATLAB Online 中打开

Thanks, Adam!

Below is my pinpointing function that is having the x y range difference issue:

%  FIND NEAREST (X,Y,Z) COORDINATE TO MOUSE CLICK
% Inputs:
%  hObj (unused) the axes
%  event: info about mouse click
% OUTPUT
%  coordinateSelected: the (x,y,z) coordinate you selected
%  minIDx: The index of your inputs that match coordinateSelected.
% Factor = (max(y)-min(y))/(max(x)-min(x));
pt = event.IntersectionPoint;       % The (x0,y0,z0) coordinate you just selected
coordinates = [x(:),y(:),z(:)];     % matrix of your input coordinates
dist = pdist2(pt,coordinates);      %distance between your selection and all points
[~, minIdx] = min(dist);            % index of minimum distance to points
coordinateSelected = coordinates(minIdx,:); %the selected coordinate

Adam Danz 2020-1-22

ahhhh I remember this now. You might remember that I recreated the same axis ranges but didn't have the problem but then I realized your plot was much smaller (embedded within an app) which increases the chance of the wrong point being selected (here's the link). But when I tried with your actual app axes, it worked when I selected the outlier data points (link).

If this problem is with the same densely plotted data I'm not sure there will be a good solution to precisely selecting a single coordinate with the mouse. Have you tried zooming into the axes in order to spread out the data points and increase your mouse's precision?

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How to make zoom in and zoom out functions of a figure work in this situation?

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How to make zoom in and zoom out functions of a figure work in this situation?

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