How to add context menu to imrect ?

How to add context menu to imrect ..I have a image i want to select a particular part using imrect nd then i want to add context menu to dat part how can i do the same./?????/ Its urgent.. help me asap....

[Walter Roberson]

http://www.mathworks.com/matlabcentral/answers/29922-why-your-question-is-not-urgent-or-an-emergency

Answer 1

[Michael]

Here's a basic function I created that calculates statistics for the ROI chosen by an imrect:

function imstatsrect(im)

% This function displays the data in the input 2D array 'im' in a new
%   figure
% A draggable, resizeable rectangle allows the user to define a ROI
% The rectangle is limited by the size of the original image. Zoom
%   functions are compatible but it’s possible to zoom so the rectangle is 
%   out of your field of view.
% The title and axes labels of the figure are continually updated with the
%   position and statistics (mean and standard deviation) for the ROI
% The structure variable tempimstatscur in the  main workspace is
%   constantly updated with the stats from the ROI
% Right-clicking the rectangle and choosing the context-menu option 'Copy
%   current data to workspace' appends the current stats to the structure
%   variable 'tempimstatssave'. Stats from multiple rectangles can be 
%   appended to this variable. The variable is reset when this function is
%   run again
%
% Michael S. D. Smith February 11, 2013

figure
imagesc(im);
hrect = imrect(gca, [1 1 round(size(im,2)/2) round(size(im,1)/2)]);
api = iptgetapi(hrect);

hrectchild = get(hrect, 'Children');
hcmenu = get(hrectchild(1),'UIContextMenu'); % get the handle for the context menu
itemnew = uimenu(hcmenu, 'Label', 'Copy current data to workspace', 'Callback', @copytoworkspace); % add a menu item to copy data to workspace

fcn = makeConstrainToRectFcn('imrect',get(gca,'XLim'),get(gca,'YLim'));
api.setPositionConstraintFcn(fcn);

api.addNewPositionCallback(@newpos);

evalin('base','tempimstatscur.xrange=[0 0];')
evalin('base','tempimstatscur.yrange=[0 0];')
evalin('base','tempimstatscur.mean=0;')
evalin('base','tempimstatscur.std=0;')
evalin('base','clear tempimstatssave')

function newpos(p)

xmin=ceil(p(1));  % make sure values are integers
ymin=ceil(p(2));
xmax=floor(p(1)+p(3));
ymax=floor(p(2)+p(4));

imdata=getimage(gca); % get data from current image
datamean=mean2(imdata(ymin:ymax,xmin:xmax));
datastd=std2(imdata(ymin:ymax,xmin:xmax));
title(['mean=' num2str(datamean) ', std=' num2str(datastd)]); % display current stats in labels
xlabel(['xmin=' num2str(xmin) ', xmax=' num2str(xmax)])
ylabel(['ymin=' num2str(ymin) ', ymax=' num2str(ymax)])

imstats.xrange=[xmin xmax];
imstats.yrange=[ymin ymax];
imstats.mean=datamean;
imstats.std=datastd;
assignin('base','tempimstatscur',imstats)

function copytoworkspace(varargin)

try 
    evalin('base','tempimstatssave(length(tempimstatssave)+1) = tempimstatscur;')
catch
    evalin('base','tempimstatssave = tempimstatscur;')  
end

Answer 2

[Michael]

Here's the barebones of how I managed to do this:

hrect = imrect(gca, [1 1 10 10]);

hrectchild = get(hrect, 'Children');
hcmenu = get(hrectchild(1),'UIContextMenu');
% get the handle for the context menu for the imrect

Once you have the handle for the context menu you can use the function uimenu to add items to the default context menu something like this:

itemnew = uimenu(hcmenu, 'Label', '[Text for menu here]', 'Callback', @callbacknamehere); 
% add a menu item to copy data to workspace

Depending what you want to do you'll probably want to create a callback function (or just use an inline function) for your new menu item.