How to fix a callback for a checkbox

7 次查看（过去 30 天）
Amanda
Amanda 2022-12-4
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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回答（1 个）

Rik
Rik 2022-12-4
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.
  2 个评论
Rik
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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