how get value at pos(3) position by using "datacursormode on" in axes ???

Question

muhammad zulhelmy 2017-3-3

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/327960-how-get-value-at-pos-3-position-by-using-datacursormode-on-in-axes

评论： muhammad zulhelmy 2017-3-5

采纳的回答： Walter Roberson

2.PNG

在 MATLAB Online 中打开

This is my coding :

%%----->DO 2D CONTOUR MAP<-----%%
B = get(handles.uitable2,'Data'); 
[C,h] = contourf(B); %countour map the excel in 2D with handles 
set(h,'LineWidth',2) %handles line width with "2"

im builde the GUIDE in MATLAB....

The question is, how can i retrieve value at pos(3) position by using "datacursormode on" to display at editbox??? can u continue my command please... URGENT...

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Geoff Hayes 2017-3-3

muhammad - please don't post your question in multiple threads, especially as an answer to another question.

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Answer 1

Walter Roberson 2017-3-3

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https://ww2.mathworks.cn/matlabcentral/answers/327960-how-get-value-at-pos-3-position-by-using-datacursormode-on-in-axes#answer_257177

See https://www.mathworks.com/matlabcentral/answers/327404-how-to-read-the-rgb-value-from-a-grayscale-image-just-like-the-data-cursor-does

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Answer 2

Geoff Hayes 2017-3-3

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/327960-how-get-value-at-pos-3-position-by-using-datacursormode-on-in-axes#answer_257170

在 MATLAB Online 中打开

muhammad - I suspect that you will need to do something similar to https://www.mathworks.com/matlabcentral/answers/157879-how-to-pass-the-variables-to-data-cursor-s-updatefcn-datacursormode-in-matlab-guide. You will need to do

 handles.dcm_obj = datacursormode(hObject);
 set(handles.dcm_obj,'Enable','on','UpdateFcn',{@myupdatefcn,hObject});

In the myupdatefcn callback, you will need to define the text string (similar to the output you have shown in the image). As this uses pos, then you have access to the third element which you can set back in the edit text field of your GUI since we are assuming that the hObject passed into this callback (when set above) is the handle to the figure.

 function txt = myupdatefcn(~,event_obj,hFigure)
 pos = get(event_obj,'Position');
 txt = 'something using pos';
 handles = guidata(hFigure);
 if isfield(handles,'text1')
     set(handles.text1,'String',num2str(pos(3)));
 end

The above assumes that text1 is the control to update with your text.

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muhammad zulhelmy 2017-3-4

******SO I FOLLOW YOUR STEP, BUT IT'S STILL DOESN'T WORK...********

function contour_Callback(hObject, eventdata, handles)
% hObject handle to contour (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
%%----->DO 2D CONTOUR MAP<-----%%
B = get(handles.uitable2,'Data'); %copy data from table, uitable2
[C,h] = contourf(B); %countour map the excel in 2D with handles
set(h,'LineWidth',2) %handles line width with "2"
set(gca,'YDir','reverse') %reverse the y-scale+excel data (flip up to down)
set(gca,'XAxisLocation','top'); %bring x-axis to the top
colorbar; %display colorbar level
datacursormode on; %enables data cursor mode on current figure
handles.dcm_obj = datacursormode(hObject);
set(handles.dcm_obj,'Enable','on','UpdateFcn',{@myupdatefcn,hObject});
function txt = myupdatefcn(~,event_obj,hFigure)
pos = get(event_obj,'Position');
txt = 'something using pos';
handles = guidata(hFigure);
if isfield(handles,'text1')
set(handles.text1,'String',num2str(pos(3)));
end
set(gca,'FontSize',15,'LineWidth',0.5); %set fontsize+width of axis scale
guidata(hObject, handles);dth of axis scale
# guidata(hObject, handles);

******THIS IS THE ANSWER WHAT I GET AFTER RUN THIS CODING :********

??? Error using ==> datacursormode at 147
Invalid figure handle
Error in ==> mapping>contour_Callback at 17
handles.dcm_obj = datacursormode(hObjec;
Error in ==> gui_mainfcn at 96
feval(varargin{:});
Error in ==> mapping at 42
gui_mainfcn(gui_State, varargin{:});
Error in ==>
@(hObject,eventdata)mapping('contour_Callback',hObject,eventdata,guidata(hObject))
??? Error while evaluating uicontrol Callback

muhammad zulhelmy 2017-3-4

在 MATLAB Online 中打开

1.PNG

*I FOLLOW YOUR STEP BUT STILL HAS SOME ERROR***

%%----->DO 2D CONTOUR MAP<-----%%
B = get(handles.uitable2,'Data');
axes(handles.axes5); %focus contour map on axes5
[C,h] = contourf(B); %countour map the excel in 2D with handles
set(h,'LineWidth',2) %handles line width with "2"
set(gca,'YDir','reverse') %reverse the y-scale+excel data (flip up to down)
set(gca,'XAxisLocation','top'); %bring x-axis to the top
colorbar; %display colorbar level

 handles.dcm_obj = datacursormode(hObject);
 datacursormode on
 set(handles.dcm_obj,'Enable','on','UpdateFcn',{@myupdatefcn,hObject});

set(gca,'FontSize',15,'LineWidth',0.5); %set fontsize+width of axis scale

guidata(hObject, handles);

function txt = myupdatefcn(~,event_obj,hFigure)
pos = get(event_obj,'Position');
txt = 'something using pos';
handles = guidata(hFigure);
set(handles.text6,'String',num2str(pos(3)));
guidata(hObject, handles);