How to use ginput with live video?

Hello, I have the following code:

x = [];
while ishandle(h)
    if isempty(x) == 1    
        imagesc(baslerGetData(baslerID,1)); %my function which captures 1 frame from my BASLER camera
        colormap(gray);
        axis off
        drawnow
        [x,y] = ginput(1);
    else
        break
    end
end

I want to have live video in my figure, and then when some location is selected with ginput the loop should break. Problem is that once ginput is initiated everything stops until I press the mouse, so I lose the frames refreshing.

Any ideas for a workaround?

THANK YOU

Answer 1

[Joseph Cheng]

I don't really think ginput() would be the best function to use. why not something like

%%live video answers example
function livevideexample()
hfig = figure(1); %gen figure handles
set(hfig,'windowButtonDownFcn',@clicker) %set button down function to clicker (see below)
hfig.UserData=1; %use userdata as a flag.

while hfig.UserData
   imagesc(randi(256,512,512));    %my fake basler camera live feed
   drawnow, pause(.1) %just here so i can see a "live" feed
end

%what happens when you click on the figure
function clicker(hobject,event)
whichbutton=get(hobject, 'selectiontype'); %this gets what button was pressed
where=get(hobject, 'currentpoint');

switch whichbutton % if anything really but i put this here anyways
    case 'normal' %left mouse click
        hobject.UserData=0; %set the object's user data to 0 (ie 0 for live feed)
    case 'alt' %right mouse click
        hobject.UserData=0;
    case 'extended' %middle? mouse click
        hobject.UserData=0;
end

now this is going to get the click in the figure (not the axis). but i've run out of time so i'll let you figure out how to use my "where" variable to get figure xy and compare it to axis position or do a quick search on how to determine what point in an image is collected by buttondownfunction.

[Mark Golberg]

Thank you Joseph. This might work for me, but I have encountered into few technical issues (sorry, I'm new to Matlab):

1. how do I extract your where variable when the function is being called in such "function handle" way?

2. could find how to transform the figure coordinates to my axes coordinates...??

please help...

THANKS AGAIN

[Walter Roberson]

http://www.mathworks.com/matlabcentral/answers/269093-firing-event-if-mouse-enters-graphic-objects-figure-axes-button-etc#answer_210628

[Mark Golberg]

Thank you Walter. As my mission to determine where inside my axes the mouse was clicked, in scaling of the axes I thought of the following procedure:

1. get axes position inside my figure

2. get mouseClick position inside my axis

3. scale result from section 2 (in pixel units) to axes limits (my axes are linear).

so for example, if my XLim = [0 800], then pressing somewhere in the middle of the axes would return mouseClick_X = 400.

Does my logic sounds ok?

THANK YOU