Opening a subplot by clicking onto certail point in the point graph

Hello to everyone, I would like to ask for help regarding the action, which would allow to create a subplot by clicking onto certain point within the point graph. As a solution, I´ve found a relatively similar topic here:

https://uk.mathworks.com/matlabcentral/answers/475853-how-to-enable-a-figure-so-that-if-i-click-on-a-point-and-it-will-show-the-value

However, it didn´t solved by problem since do not how to include the data into the function, which will be furher used for the plotting action. I am attaching the minium working example.

Thank you for yuur help.

% Let's have a cell array, which contains wave transients, where in each cell, there's a time vector and corresponding signal

%Cell array containing two signals (time axis + voltage)
HIT_DB{1}(:,1)=0:0.01:1;
HIT_DB{1}(:,2)=sin(2*pi*HIT_DB{1}(:,1));

HIT_DB{2}(:,1)=0:0.01:2;
HIT_DB{2}(:,2)=sin(4*pi*HIT_DB{2}(:,1));

%To this cell array belongs an array of two points, where point #1 [15,18] correspons to signal stored in HIT_DB{1},
% while point #2 [34.5 45.1] corresponds to signal stored in HIT_DB{2}

data=[15 18;34.5 45.1];

%According to the link above, it is possible to get the index of point onto which has been clicked, 
% but now I cannot figure out how to perform the plotting of the corresponding signal.

figure('Renderer', 'painters', 'Position', [50 50 1000 600])
axh = axes();
x=data(:,1);
y=data(:,2);
h=plot(axh,x,y,'bo','MarkerSize',4,'LineWidth',1)
xlabel('Cas [sec]');
ylabel('Amplituda [dBAE]')


h.ButtonDownFcn = @showZValueFcn;


function [coordinateSelected, minIdx] = showZValueFcn(hObj,event)

%  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. 
x = hObj.XData;
y = hObj.YData; 
z = zeros(length(x),1);
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
% from here you can do anything you want with the output.  This demo
% just displays it in the command window.  
fprintf('[x,y,z] = [%.5f, %.5f, %.5f]\n', coordinateSelected)
%disp(num2str(Hit_params(minIdx,1)))
end % <--- optional if this is embedded into a function

Answer 1

[Divyanshu]

Hi MS,

The Code provided in the description accurately detects the point clicked in the first plot. Moreover the function 'showZValueFcn' is triggered when a point is clicked in the first plot.

Here is the modified code which now creates a sub-plot when a point is clicked in the first plot:

HIT_DB{1}(:,1)=0:0.01:1;
HIT_DB{1}(:,2)=sin(2*pi*HIT_DB{1}(:,1));

HIT_DB{2}(:,1)=0:0.01:2;
HIT_DB{2}(:,2)=sin(4*pi*HIT_DB{2}(:,1));

data=[15 18;34.5 45.1];

f = figure('Renderer', 'painters', 'Position', [50 50 1000 600]);
axh = axes(f);
x=data(:,1);
y=data(:,2);
tiledlayout(1,2);
nexttile;
h = plot(x,y,'bo','MarkerSize',4,'LineWidth',1)
xlabel('Cas [sec]');
ylabel('Amplituda [dBAE]')


h.ButtonDownFcn = @showZValueFcn;


function [coordinateSelected, minIdx] = showZValueFcn(hObj,event)

x = hObj.XData;
y = hObj.YData; 
z = zeros(length(x),1);
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,:);

nexttile;
plot([1:5],[1:5]);
end

However, the sub-plot just plots the dummy data and should be modified as per the use-case.

You can refer the following documentation for further details about 'tiledlayout':

https://www.mathworks.com/help/releases/R2021a/matlab/ref/tiledlayout.html

Hope it helps!