CODEWITHSUNDEEP
matlabmatlab-guide
Sade
Sade

Reputation: 511

Error while evaluating figure WindowButtonDownFcn-Undefined function within a matlab guide class

The algorithms loads two images and displays it. The user has the option of clicking on either one of the images and dragging it across the screen. The objective is to give the user the ability to overlay the images.

There are two scripts 1)Main.m and 2)gui_class. Script Main.m contains the gui functions and callbacks. gui_class is designed to load the images and simulates the click that initiates the dragging function of the image.

Within classdef gui_class < handle lies 

properties (Access = private)
        x = [];
        y = [];

        c1 = [];
        r1 = [];
        h  = [];
        w  = []; 

        gui_h;
end
    methods

        %function - class constructor - creates and init's the gui
        function this = gui_class

            %make the gui handle and store it locally
            this.gui_h = guihandles(Main);
             %set the callback functions

                set(this.gui_h.load_image ,'callback' ,@(src, event) load_image_Callback(this, src, event))
        end
    end
`    methods (Access = private)


        function this =  load_image_Callback(this, src, event)
            %code loads and displays images here
            %trigger a mouse click
            set(gcf,'windowbuttondownfcn',@(src, event) Mclicked(src, event));
        end
        function Mclicked(this, src, event)
     % get the handles structure
         set(gca,'units','pix') ;
         mousePositionData = get(gca, 'CurrentPoint')
         this.x = mousePositionData(1,1);
         this.y = mousePositionData(1,2);
           %...Perform task
        end

I get an error message : Error while evaluating figure WindowButtonDownFcn-Undefined function within a matlab guide class Undefined function 'Mclicked' for input arguments of type 'double'.

Error in gui_class/load_image_Callback/@(src,event)Mclicked(src,event)

How does one correctly call up this function correctly? In addition to that question, why is this occurring? I stated in it in main.m as mentioned below:

function Mclicked(hObject, eventdata, handles)

Upvotes: 0

Views: 1822

Answers (1)

TroyHaskin
TroyHaskin

Reputation: 8401

The function Mclicked is a method bound to instances of gui_class and expects such a class as it's first argument or to be called via dot-notation from an instance of the class. So either

set(gcf,'windowbuttondownfcn',@(src, event) Mclicked(this, src, event));

or

set(gcf,'windowbuttondownfcn',@(src, event) this.Mclicked(src, event));

will invoke the method.

Upvotes: 1

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