Create a slider in GUI?

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kelly123 2015-12-6

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https://ww2.mathworks.cn/matlabcentral/answers/259068-create-a-slider-in-gui

评论： Adam 2016-7-28

采纳的回答： Image Analyst

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Hi,

I'm experimenting with GUIDE and was wondering how to create a slider that allows the user to fix the threshold value from 0 - 255 of an image.

    % --- Executes on slider movement.
    function slider1_Callback(hObject, eventdata, handles)
    % hObject    handle to slider1 (see GCBO)
    % eventdata  reserved - to be defined in a future version of MATLAB
    % handles    structure with handles and user data (see GUIDATA)
    % Hints: get(hObject,'Value') returns position of slider
    %        get(hObject,'Min') and get(hObject,'Max') to determine range of slider
    global grayImage;
    thresholdValue = uint8(get(handles.sldThreshold, 'Value'));
    binaryImage= grayImage > thresholdValue; 
    axes(handles.axes2);

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kelly123 2015-12-6

It returns:

Undefined variable "handles" or function "handles.slider1".

Varian Adisuryo 2016-7-28

same here. I have the same eror. what should I do?

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采纳的回答

Image Analyst 2015-12-6

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After the call to axes() in slider1_Callback, you need to call

imshow(binaryImage);

I just did what you told, but when I run it the slider doesn't show and it become like this: Warning: slider control can not have a Value outside of Min/Max range Control will not be rendered until all of its parameter values are valid

what should I do? please help. I've been struggling with this slider for 3 days :(

Adam 2016-7-28

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You can set the min, max and value all in a single set command if you want e.g.

set( handles.slider1, 'Min', 0, 'Max', 10, 'Value', 5 )

to make sure that the value is always within the min to max range and avoid getting that warning. The warning is pretty self-explanatory though from the point of view of knowing what is wrong.

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MATLAB Graphics Graphics Objects Interactive Control and Callbacks

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