My slider disappears and it comes up with that error

3 次查看（过去 30 天）
Stelios Fanourakis
评论： Image Analyst 2018-6-9
I am trying to write a function for having the slider moves according to the mouse wheel. Here is my code
function mouseScroll(~,eventdata,I)
handles = guidata(gcf);
S = round((get(handles.SliderFrame,'Value')));
sno = size(MyMatrix);
UPDN = eventdata.VerticalScrollCount;
S = S - UPDN;
if (S < 1)
S = 1;
elseif (S > sno)
S = sno;
end
if sno > 1
set(handles.SliderFrame,'Value',S);
set(handles.Edit1, 'String', sprintf('Slice# %d / %d',S, sno));
else
set(handles.Edit1, 'String', '2D image');
end
frameindex = max(1, min(S, NumFrames));
handles.frameindex = frameindex+1;
ff = filelist{frameindex};
I=dicomread(ff);
imshow(I, 'parent', handles.axes1);
guidata(hFig,handles);
drawnow()
end
I get the error "Warning: 'slider' control cannot have a 'Value' outside of 'Min'-'Max' range Control will not be rendered until all of its parameter values are valid" when the slider exceeds the maximum value, where it disappears.
Any idea?

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采纳的回答

Rik
Rik 2018-6-8
Replace
set(handles.SliderFrame,'Value',S);
with
if S>get(handles.SliderFrame,'Max')
S=get(handles.SliderFrame,'Max');
elseif S<get(handles.SliderFrame,'Min')
S=get(handles.SliderFrame,'Min');
end
set(handles.SliderFrame,'Value',S);
  2 个评论
Image Analyst
Image Analyst 2018-6-9
You can now (>= R2014b) use the more usual "dot" OOP syntax:
sliderValue = handles.SliderFrame.Value;
if sliderValue > handles.SliderFrame.Max
sliderValue = handles.SliderFrame.Max;
elseif sliderValue < handles.SliderFrame.Min
sliderValue = handles.SliderFrame.Min;
end
handles.SliderFrame.Value = sliderValue;

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更多回答（1 个）

Image Analyst
Image Analyst 2018-6-8
Put this code in there somewhere:
sliderValue = handles.SliderFrame.Value;
sliderMin = handles.SliderFrame.Min;
sliderMax = handles.SliderFrame.Max;
if sliderValue < sliderMin || sliderValue > sliderMax
% Set slider in the middle.
handles.SliderFrame = (sliderMin + sliderMax) / 2;
% Update value in this function (if we need it later).
sliderValue = handles.SliderFrame.Value;
end
  1 个评论
Stelios Fanourakis
Stelios Fanourakis 2018-6-8
Thanks for the feedback Image Analyst. I will keep your answer valuable as well, but I managed to fix it using the above answer by Rik.

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