How to use First button function codes "symbol name" in Second button function in App Designer

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Ali Zulfikaroglu
Ali Zulfikaroglu 2021-3-3
评论： Rik 2021-3-3
I have an image. In app designer , I use "axes application" to add image there. When I click first button I add image and show it in Axes area.
I added second button . In second button I want to filter that same image when I click it.
For example my image name is "imgf" and I use imshow(img) when I click first button and show it. I want to use that "imgf" in my second button. But it gives error.
Because that "imgf" belongs to in first button function codes. How will I use that "imgf" in my second button function codes.
Codes are below
% Callbacks that handle component events
methods (Access = private)
% Button pushed function: SelectAnImageButton
function SelectAnImageButtonPushed(app, event)
global imgf;
[filename pathname]= uigetfile({'*.jpg'},"Open file");
fullpathname= strcat(pathname,filename);
imgf=imread(fullpathname);
if(size(imgf,3)>1)
imgf=rgb2gray(imgf);
end
imshow(imgf,'parent',app.UIAxes);
end
% Button pushed function: FilterTheImageButton
function FilterTheImageButtonPushed(app, event)
img=imgaussfilt(imgf); % I want to use "imgf" in here to filter the image
imshow(img,'parent',app.UIAxes);
end
end
  2 个评论
Ali Zulfikaroglu
Ali Zulfikaroglu 2021-3-3
I want to also use third button. In Third button I want to use roipoly command to draw a circle on image.
But I should use filtered image in second function and continue with that "img" in third button function .
mask=roipoly(img);
How will I draw a circle with using roipoly command on uıaxes ?

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采纳的回答

Rik
Rik 2021-3-3
Don't use global variables. There are many other ways to share data between callbacks. You should probably store the variable in a property.
  4 个评论
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Ali Zulfikaroglu
Ali Zulfikaroglu 2021-3-3
I realised my mistake at property .
And it should be added app.
properties (Access = private)
t % Using this description
end
% Callbacks that handle component events
methods (Access = private)
% Button pushed function: SelectAnImageButton
function SelectAnImageButtonPushed(app, event)
global imgf;
[filename pathname]= uigetfile({'*.jpg'},"Open file");
fullpathname= strcat(pathname,filename);
imgf=imread(fullpathname);
if(size(imgf,3)>1)
imgf=rgb2gray(imgf);
end
imshow(imgf,'parent',app.UIAxes);
app.t=imgf % t is in here property function and it should be app.t
end
% Button pushed function: FilterTheImageButton
function FilterTheImageButtonPushed(app, event)
img=imgaussfilt(app.t);
imshow(img,'parent',app.UIAxes);
end
end

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