CODEWITHSUNDEEP
matlabeventsplotonclickmatlab-figure
nullgeppetto
nullgeppetto

Reputation: 569

How to create new points in existing matlab figure and execute function

This is briefly my question: If I have an existing 2D simple matlab figure, I would like to create new points by clicking (or by double-clicking) to a certain point. In addition, I would like to execute a script, or function, or even a command every time I create a new point. I did search both on the web and here carefully but I had no luck...

Could you help please? Thanks in advance!

Upvotes: 1

Views: 1209

Answers (1)

Lucius II.
Lucius II.

Reputation: 1832

something I found-> you need the ButtonDown-Callback:

ax=axes;%you need the handle of the axes
%to give additional values to the callback-fcn use:
set(ax,'ButtonDownFcn',{@mytestcallback,mydata})
%if you dont want to give extra values:
set(ax,'ButtonDownFcn',@mytestcallback)

next you have to define the function mytestcallback like that:

function mytestcallback(h,eventdata)
point = get(h,'currentpoint');

now, within this function you can do whatever you want, like executing another script...

EDIT

what I tried:

function test_mouse
h=figure;
plot(1:10)
myax=findall(h,'Type','axes')
set(myax,'ButtonDownFcn',@mytestcallback)

end

function mytestcallback(h,eventdata)
point = get(h,'currentpoint')
end

what I get, when clicking on the axes:

suprisingly, there is a matrix, like:

point =

3.0219    1.2500    1.0000
3.0219    1.2500   -1.0000

which contains the coordinates of x,y,z with a z=[1,-1]; I guess you can ignore that, if you just have 2d-data

Now, if you want to add new values, you have to get the line in the plot, get the data and update it. I would do something like:

1. get the handle of the line myline=findall(myax,'Type','line') % be careful, this will return all lines (if you have more then one)

2. get the data of the line:

xdat=get(myline,'XData')
ydat=get(myline,'YData')

3. manipulate the data: -> well this depends on what you want to do (insert, append...)

xdat=newdata...

4. update data:

set(myline,'XData',xdat)...

Upvotes: 2

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