How to fix a callback for a checkbox

Question

Amanda 2022-12-4

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1870497-how-to-fix-a-callback-for-a-checkbox

编辑： Rik 2022-12-4

I have a check box that tracks the toggle history of my robot meaning when its clicked its shows the path of the robot and when its unclicked it doesnt. I have write a fucntion but Idk why its wont work when I click the button.

createRandomMaze
figure;
first_button = uicontrol('style', 'pushbutton');
set(first_button, 'units', 'normalized', 'position', [0.2,0.7, 0.2, 0.2])
set(first_button, 'string', 'turn left')
set(first_button, 'callback', @turnLeft)
second_button = uicontrol('style', 'pushbutton');
set(second_button, 'units', 'normalized', 'position', [0.4, 0.7, 0.2, 0.2])
set(second_button, 'string', 'step')
set(second_button, 'callback', @step)
third_button = uicontrol('style', 'pushbutton');
set(third_button, 'units', 'normalized', 'position', [0.6, 0.7, 0.2, 0.2])
set(third_button, 'string', 'turn right')
set(third_button, 'callback', @turnRight)
fourth_button = uicontrol('style', 'pushbutton');
set(fourth_button, 'units', 'normalized', 'position', [0.2, 0.5, 0.2, 0.2])
set(fourth_button, 'string', 'left')
set(fourth_button, 'callback', @stepLeft)
fifth_button = uicontrol('style', 'pushbutton');
set(fifth_button, 'units', 'normalized', 'position', [0.4, 0.5, 0.2, 0.2])
set(fifth_button, 'string', 'back')
set(fifth_button, 'callback', @stepBack)
sixth_button = uicontrol('style', 'pushbutton');
set(sixth_button, 'units', 'normalized', 'position', [0.6, 0.5, 0.2, 0.2])
set(sixth_button, 'string', 'right')
set(sixth_button, 'callback',@stepRight)
seventh_button = uicontrol ('style','checkbox');
set(seventh_button, 'units', 'normalized', 'position', [0.2, 0.3, 0.2, 0.2])
set(seventh_button, 'string', 'History')
set(seventh_button, 'callback', @toggleHistory)
eighth_button = uicontrol ('style', 'edit');
set(eighth_button, 'units', 'normalized', 'position', [0.4, 0.37, 0.2, 0.05])
set(eighth_button, 'string', '2')
ninth_button = uicontrol('style','pushbutton');
set(ninth_button, 'units', 'normalized', 'position', [0.6, 0.3, 0.2, 0.2])
set(ninth_button, 'string', 'Run!')
set(ninth_button, 'callback', @Run)
ninth_button.Callback = 'number_of_steps = str2num(eighth_button.String); walk(number_of_steps)';
function toggleHistory(sender, eventdata)
History = (['seventh_button', 'value']);
if History 
    showhistory 
else ~History
    hidehistory 
end 
end 
 function Run(sender, eventdata)
        step_input = (['eighth_button', 'string']);
        if ~strcmp(step_input, ' ');
            number_of_steps = str2num(step_input);
            walk(number_of_steps);
        end
    end

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Answer 1

Rik 2022-12-4

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1870497-how-to-fix-a-callback-for-a-checkbox#answer_1119542

在 MATLAB Online 中打开

Perhaps you should have a read here.

You probably intend to extract the value property, but that requires this:

History = sender.Value;

You also don't need to invert a statement for an else, only for an elseif.

If you want access to the variables you set up, you will have to use guidata, or use nested functions.

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Amanda 2022-12-4

How would i you a nested function

Rik 2022-12-4

编辑：Rik 2022-12-4

This should not be hard to find. Where have you tried to find the answer yourself?

Did you follow a basic Matlab tutorial? Did you Google this?

Also, why didn't you ask a follow up question in the previous thread about this? You should either mark an answer as accepted, or ask a follow up question until the issue is resolved. This duplication of questions is a waste of a very finite resource. There are not many people who are willing to spend a lot of time helping people on this forum.

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