I trying to get a check box to work on a gui

I have created a gui for a robot maze. I have a check box, when its checked i want it to show the bath of the robot when its not I dont want it to show the path. This is the function I a have written for it but it doesn't do what I need it to do.

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
 
 function turnRight
    turnLeft();
    turnLeft();
    turnLeft();
end 

function stepLeft
turnLeft();
step(); 
turnRight(); 
end 

function stepRight
turnRight();
step();
turnRight();
end 

function stepBack 
turnLeft();
turnLeft(); 
step();
turnRight();
end 

function turnLeft
turnRight(); 
turnRight(); 
turnRight(); 
step
end 

function step 
step(); 
end 


function steps_made_successfully = walk(number_of_steps)
steps_made_successfully = 0;
for i=1:number_of_steps
    if is_clear()steps_made_successfully = steps_made_successfully + 1;
       move_forward();
   else
       break;
   end
end
end

Answer 1

[Image Analyst]

As I check or uncheck the box (badly called "seventh_button") it does display the words according to the value of the checkbox:

showHistory

hideHistory

showHistory

hideHistory

showHistory

hideHistory

so I'm not sure what you're asking. It seems to do what you told it to do.

[Amanda]

In the robot maze it shows a line following the robot I need it to be there when you check it and disappear when its not checked

[Image Analyst]

You need to get the handle to the line when you plot it.

plotHandle = plot(x, y);

Then call

delete(plotHandle) 

when you want to erase the line. Then when the box is checked call plot again.