Hi everyone,
I am working in the App Designer and I want to have a tool which lets the user select a bunch of datapoints. I have a UI Axes and defined a ButtonDownFcn.
Once the user clicks in the axis I basically want to trigger some sort of selection process. The goal is to select the datapoints from the first click up until the mouse is clicked a second time. It is not obvious to me how I can infer from the cursor position (which i can extract) which of my datapoints is closest. Lets say I have plotted 1000 random datapoints, I dont know how a cursor position of say 200 could give me any idea about my real values.
Maybe some of you have encountered a similar problem and can help, that would be really great. Also if there may be a better solution, I am happy to hear it.
Thank you very much!!
For the button down function i was thinking about something along the line of:
selectedRegions = [];
% Button down function: RawEEG_ax
app.ax.ButtonDownFcn = @(hObject, evt) axclick(hObject,evt);
function axclick(hObject,evt)
x = dataIdx1;
cp = hObject.CurrentPoint;
cx = cp(1,1);
if isempty(selectedRegions)
selectedRegions(1) = round(interp1(x, 1:numDataPoints, cx, 'nearest', 'extrap'));
else
selectedRegions(2) = round(interp1(x, 1:numDataPoints, cx, 'nearest', 'extrap'));
end
end
I know there is also this datacursor mode, but I was hoping to find a better solution than using this, since I actually do not just want the indexes of te datapoints, but was hoping to have some more functionality once I have solved this first problem, e,g, live tracking of the cursor to visualize the selected region and I think for that purpose the datacursor mode is not optimal, so I wanted to try something else.
