Dear all,
I am trying to create a GUI which has 3 main components:
1- An axis which shows a slice of a 3D image and where the user must click to plot several points;
2- A scrollbar, which controls which slice of the 3D image is shown;
3- A pushbutton, which activates the drawing function of the axis;
When the user hits the pushbutton, he/ she must click over the image and a method is called in order to plot and register the position of the click. The user should be able to move the scrollbar and visualize the ploted point in all images of the dataset. In order to do so, I created a class (CircularRoi), which has some properties, such as the coordinates of the click and the handle of the GUI. Once the user finishes the selection, he/she hits the RETURN key on the keyboard.
IF the user wants to select more points, he/ she must hit the pushbutton again and click over the points of the image. The class coordinate variables should store the previous and the new values of the coordinates and as the user moves the scrollbar, all the points must be ploted over all the images.
Here is a piece of my code:
classdef CircularRoi < handle
properties
x;
y;
xc;
yc;
handles;
hl;
end
properties (SetObservable = true)
slice;
end
methods
function obj = CircularRoi(hdl, value)
axeshandle = hdl.axs_img;
obj.handles = hdl;
obj.slice = value;
obj.addListener;
if isfield(hdl, 'roi_circle_x')
hold on;
plot(axeshandle, hdl.roi_circle_x{hdl.serie}', ...
hdl.roi_circle_y{hdl.serie}', 'c');
plot(axeshandle, hdl.roi_circle_xcenter{hdl.serie}, ...
hdl.roi_circle_ycenter{hdl.serie}, '*b');
obj.x = hdl.roi_circle_xcenter{hdl.serie};
obj.y = hdl.roi_circle_ycenter{hdl.serie};
obj.xc = hdl.roi_circle_x{hdl.serie};
obj.yc = hdl.roi_circle_y{hdl.serie};
end
end
function addListener(obj)
obj.hl = addlistener(obj.handles.sld_img, ...
'Value', 'PostSet', ...
@(src, event)plotRoi(obj, src, event));
end
function getRoi(obj, hdl, src, event)
obj.getRoiCircle;
obj.slice = get(hdl.sld_img, 'Value');
end
function plotRoi(obj, src, event)
axeshandle = obj.handles.axs_img;
serie = obj.handles.serie;
obj.slice = round(get(obj.handles.sld_img, 'Value'));
txt = findobj(get(axeshandle, 'Children'), 'Type', ...
'Text');
img = obj.handles.img{serie}(:, :, obj.slice);
delete(txt);
imshow(img, [], 'parent', axeshandle);
hold on;
xx = obj.x;
disp(xx)
yy = obj.y;
xxc = obj.xc;
yyc = obj.yc;
plot(axeshandle, xx, yy, '*b', xxc', yyc', 'c');
for ii = 1: length(xx)
text(xx(ii), yy(ii), num2str(ii), 'color', 'c', ...
'Parent', axeshandle);
end
end
The problem is, when the user hits the pushbutton for the second time, clicking on the image and moving the scrollbar, the "x" and "y" coordinates are set to their previous values. And the weirdest thing: if I ask to display the coordinate values (disp(xx)) in the prompt, it prints teh value twice, the first time with correct values of xx and the second time with the previous values of xx, i.e., the values before the user clicked on the pushbutton for the second time.
For example, if for the first time the user selected one point (x = 100, y = 90) and then clicked on the pushbutton in order to add a second point (for example 180, 200), when he/she moves the scrollbar the disp function returns two values for xx:
Instead of just concatenating the two values, it changes the object value for its previous value; Another weird thing: if I add a break point and go line by line, this strange behavior doesn't happen.
Any idea of what is going on?
