How to create a callback from a function which changes a value in another function?

Question

Hanif 2013-5-21

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/76532-how-to-create-a-callback-from-a-function-which-changes-a-value-in-another-function

采纳的回答： Iain

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Doing some Image processing, I have a slider on my figure which will change my Field of View or zoom of the images.

Function Startup

-hidden-

ImageProperties(fov,Plot)

-hidden-

FOV = 30; %Field of view

%% FOV Slider

uicontrol('Style','slider',...

    'Min',40,'Max',80,'Value',50,...
    'SliderStep',[1 10]/40,... %Slider Increases in Increments of one 
    'Position', [500 875 100 20],...
    'Callback',{@Slider});

- hidden -

end

function Slider(hObj,event)

fov = get(hObj,'Value');

end

function ImageProperties(fov,Plot)

-hidden-

set(Plot,'xlim'[-fov fov]

end

Basically I wsnt the slider to change the value of FOV and update all my images with the new FOV set by the slider.

ps Sorry for all the hidden code hope people can still help!

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Answer 1

Iain 2013-5-21

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/76532-how-to-create-a-callback-from-a-function-which-changes-a-value-in-another-function#answer_86197

Add: ImageProperties(fov,Plot) to your slider callback... obviously you'll need to supply fov and Plot.

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Hanif 2013-5-21

在 MATLAB Online 中打开

lain thanks but it didn't work! Maybe I am doing something wrong.

uicontrol('Style','slider',...

    'Min',40,'Max',80,'Value',50,...
    'SliderStep',[1 10]/40,... %Slider Increases in Increments of one 
    'Position', [1010 765 20 120],...
    'Callback',{@Slider,ImageProperties(fov,Plot)});

FOV is pre-defined above in the start up function so is Plot.

Jan 2013-5-22

I assume, lain meant the code of the callback. The value of fov is updated in the slider's callback, but then the callback returns and the value of fov is not used anywhere. So either use it directly from inside the sliders callback, or store the fov value e.g. by GUIDATA, such that the ImageProperties function can obtain it afterwards.

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