Is it possible to rotate a slider 180 degrees?

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Silvia
Silvia 2013-5-28
编辑： Matt J 2022-1-26
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

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采纳的回答

Jan
Jan 2013-5-28
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.

更多回答（1 个）

Hanif
Hanif 2013-5-30
编辑：Matt J 2022-1-26
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

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