Is it possible to rotate a slider 180 degrees?

Hello,

I have a vertical slider, is it possible to rotate it 180 degrees?. The problem is that when I move the slider from top to down the value decreases and I would need the value increases when I move the slider from top to down.

Thank you

Silvia

Answer 1

[Jan]

This is easy, when you consider the different values inside the callback:

function ExampleSlider
sliderH = uicontrol('Style', 'slider', 'position', [10, 10, 20, 100], ...
                    'Min', 0, 'Max', 1, 'Callback', @CB);

function CB(ObjH, EventData)
value = get(ObjH, 'Value');
disp(value)

Now 1 is written to the command window, if you drag the slider to the top, and 0 for the bottom. Now change the callback to:

function CB(ObjH, EventData)
value = 1 - get(ObjH, 'Value');
disp(value)

E voila, 0 appears for the top and 1 for the bottom. There is no need to rotate the slider, but changing the logic to interpret the slider position is enough.

[Silvia]

Thank you Jan

Answer 2

[Hanif]

function CreateSlider
fig = figure;
Slider = uicontrol(fig,'Style','Slider',...
                   'Max','100','Min','0','Value','0',...

                   'SliderStep',[1 1]/100,... 

                   'Position',[20 100 20 50],...

                   'Callback', @Slider); 
end 
end
function @Slider(hObj,event) SliderVal = get(hObj,'Value'); NewSliderVal = 100 - SliderVal; disp('NewSliderVal); end

% The slider will still increase when you click up, however NewSliderVal will decrease, and what ever you were using your SliderVal for, just sub in NewSliderVal instead

[Silvia]

Thank you Hanif