Why after plotting on axes the ButtonDownFcn doesn't work?

Hi,

I have a GUI with 3 axes. Before plotting the data the three functions axesX_ButtonDownFcn(...) work, but when I plot the data they don't work anymore.

I have tried this but doesn't work:

 axes(handles.plot1);
 handles.cursorPlot1 = plot(handles.simulation_data_temp(8,:), 'Parent',...
     handles.axes1, 'HitTest', 'off', 'ButtonDownFcn', '');

What I am doing wrong?

Thanks.

[Bing]

You should do this:

    % code
    set(handles.plot1,'NextPlot','new');
    cla(handles.plot1);
    axes(handles.plot1);
    handles.cursorPlot1 = plot(handles.simulation_data_temp(8,:), 'Parent',...
     handles.axes1, 'HitTest', 'off');

[David Willis]

For simple folks like me, all you need is this. I created a button and an axes. When I press the button it plots a sinewave on the axes. When I click in the axes window, the coordinates are displayed.

function pushbutton1_Callback(hObject, eventdata, handles)
%pushbutton callback function  
x = 0:100;
y = sin(2*pi*x/20);
set(handles.axes1, 'nextPlot','new'); %this is the key!
axes(handles.axes1);
plot(x,y);

% ButtonDown callback for axes1
function axes1_ButtonDownFcn(hObject, eventdata, handles)
coord = get(hObject, 'CurrentPoint') %No semicolon so it is displayed
pts = coord(1,1:2)

Answer 1

[Matt Fig]

>>  AxesH = axes('ButtonDownFcn', 'disp(''Axes click!'')');
Axes click!
Axes click!
>> plot(1:10)  % Now clicking does nothing....

No more 'Axes click!', but now try this:

>>  clear all,close all
>>  AxesH = axes('ButtonDownFcn', 'disp(''Axes click!'')');
Axes click!
>> hold all
>> plot(1:10)
Axes click!
Axes click!

Basically, when you plot on an axes that has the nextplot property set to replace, all callbacks, etc are reset in that call.

[Dani Tormo]

 hold all

That works!

So, to continue with Jan Simon's example, and differenciating both clicks on axes and on the line, this is how it will work:

 AxesH = axes('ButtonDownFcn', 'disp(''Axes click!'')');
 hold all
 Plot1 = plot(1:10, 'hittest', 'on', 'buttondownfcn', 'disp(''Line click!'')');

Thank you all guys!!

[Jan]

Fine, Matt! I've seen this for image(), but did not assume that this happens for plot() also. But why did I not see this in my test code?? For testing of a foreign toolbox I've added this in matlabrc.m:

set(0, 'DefaultAxesNextPlot', 'add')

Afterwards I cleanup startup.m. This worked for month now, because in my own programs I use the faster low-level functions like line().

Answer 2

[Deep Desai]

Jan, would I be expected to do the same incase I was using a function and not displaying a text.

My code;

set(handles.threat,'HitTest','off');
set(handles.threat, 'ButtonDownFcn', {@threat_ButtonDownFcn,handles}); 
hold all
scatter(handles.threat,green_distance, gGreenTime,'g*');

function threat_ButtonDownFcn(hObject, eventdata, handles)

    P = get(handles.threat,'CurrentPoint');

Thanks again mate.

Answer 3

[Jan]

You set the ButtonDownFcn explicitly to the empty string. What kind of processing do you expect afterwards?

[EDITED]

AxesH = axes('ButtonDownFcn', 'disp(''Axes click!'')');
Plot1 = plot(1:10, 'Parent', AxesH, 'HitTest', 'off', 'ButtonDownFcn', '');

Now clicking on the axes still works. Please test this. And now find out, where in your code the ButtonDownFcn is overwritten. And/or set a breakpoint in the ButtonDownFcn to find out, if it is still called, but any other error occurres.

[Dani Tormo]

Oh dammit. You're right.

I saw this on another answer and I just copied because only with 'Parent' and 'HitTest' doesn't work.

The problem is that after plotting, the ButtonDownFcn doesn't work anymore.

What I should put to make it working again?

[Sean de Wolski]

Turn it's 'Hittest' on and it's 'ButtonDownFcn' to something

[Dani Tormo]

Using your example:

 AxesH = axes('ButtonDownFcn', 'disp(''Axes click!'')');

ButtonDownFcn works fine. Then I execute the next command:

 Plot1 = plot(1:10, 'Parent', AxesH, 'HitTest', 'off', 'ButtonDownFcn', 'disp(''Axes click 2!'')');

Now when you click on the line, matlab shows Axes click 2!

But if I check the field 'ButtonDownFcn' of AxesH it's empty. Do you know why?

Assigning again the 'ButtonDownFcn' to AxesH work both, showing Axes click! when you click on the axes, and Axes click 2! when you click on the line.

But why it is overwrited?

Thanks for your help, man!

[Dani Tormo]

Thanks Jan, hold all solves this problem.

Answer 4

[Image Analyst]

For the Mathworks view on this: http://www.mathworks.com/support/solutions/en/data/1-1B03X/?solution=1-1B03X

[Dani Tormo]

Thanks!

I tried but it didn't work. After plotting the field ButtonDownFcn of AxesH is empty. Why this happens?

I wrote the explanation on Jan's comment.