I need help fix a check box in a gui

Question

Amanda 2022-12-2

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1869047-i-need-help-fix-a-check-box-in-a-gui

回答： Dev 2025-4-29

I have create a gui for a robot maze. When the robot moves through the maze a blue line follows the path the robot took. In my gui I have a check box that is label history when it checked i want it to show the blue line when its unchecked I want it to no show the blue line. I am unsure how to do this.

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)
if sender.Value == 1
    disp showHistory
else 
    disp 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

Dev 2025-4-29

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1869047-i-need-help-fix-a-check-box-in-a-gui#answer_1564409

在 MATLAB Online 中打开

Hi @Amanda,

We can show/hide the blue line based on the current state of the check box by leveraging the steps below-

Store a handle to the blue line when you plot it: We can use the “setappdata” function in MATLAB to store the blue line and the “getappdata” function to share this handle among callbacks.

Please refer to an example code snippet below-

figureHandle = gcf;
% After plotting the blue line, store its handle:
blueLine = plot(xPath, yPath, 'b', 'LineWidth', 2); % Example plotting
setappdata(figureHandle, 'blueLineHandle', blueLine);

Update the “toggleHistory” function: The “toggleHistory” function in the code provided in the question, we can show/hide the line by setting its ‘Visible’ property. The code provided below achieves the same-

fig = ancestor(sender, 'figure');
blueLine = getappdata(fig, 'blueLineHandle');
if isempty(blueLine) || ~isgraphics(blueLine)
    return; % No line to show/hide yet
end
if sender.Value == 1
    set(blueLine, 'Visible', 'on');
else
    set(blueLine, 'Visible', 'off');
end