Matlab dragNdrop

gistfile1.matlab

%% define each of these functions in separate function files
%% with file name equal to function name
%1
function dropObject(hObject,eventdata)
    
global dragging ;
global orPos ;
global axisSize;

    if ~isempty(dragging)
        newPos = get(gcf,'CurrentPoint');
        posDiff = newPos - orPos;
        posDiff = posDiff.*axisSize;
        %set(dragging,'Position',get(dragging,'Position') + [posDiff(1:2) 0 0]);
        set(dragging,'Xdata',get(dragging,'Xdata')+[posDiff(1) posDiff(1)], ...
            'Ydata',get(dragging,'Ydata')+[posDiff(2) posDiff(2)]);
        dragging = [];
    end
end

%2
function moveObject(hObject,eventdata)
    
global dragging ;
global orPos ;
global axisSize;

    if ~isempty(dragging)
        newPos = get(gcf,'CurrentPoint');
        posDiff = newPos - orPos;
        orPos = newPos;
        posDiff = posDiff.*axisSize;
        %set(dragging,'Position',get(dragging,'Position') + [posDiff(1:2) 0 0]);
        set(dragging,'Xdata',get(dragging,'Xdata')+[posDiff(1) posDiff(1)], ...
                 'Ydata',get(dragging,'Ydata')+[posDiff(2) posDiff(2)]);

    end
end
%3
function dragObject(hObject,eventdata)
 
global dragging;
global orPos;


    dragging = hObject;
    orPos = get(gcf,'CurrentPoint');
end
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% initilaize main file like this

f = figure('WindowButtonUpFcn',@dropObject,'units','normalized','WindowButtonMotionFcn',@moveObject);
 
global dragging ;
global orPos ;
global axisSize;

axisSize = 1500;
axis([0 axisSize 0 axisSize])
hold on
 
%% add this property to image you want to drag
ximg = imread('city.png');
h_img = image(ximg,'ButtonDownFcn',@dragObject);