Slider Code Only Displaying One Image

Question

Amanda 2012-9-3

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/47299-slider-code-only-displaying-one-image

I want to scroll through 3 plots with the slider inside GUIDE.

But I'm only getting one plot and not 3. Here is the code:

%Data For Slider
handles.x = 1:100;
handles.y = 1:100;
axes = handles.axes1;
set(handles.slider1,'Min',1,'Max',3,'SliderStep',[0.01 0.1],'Value',3);
sliderValue = int32(get(handles.slider1, 'Value'));
switch sliderValue 
  case 1
      cla;
      plot(axes,handles.x,handles.y,'r');
  case 2
      cla;
      plot(axes,handles.x,handles.y,'b');        
  case 3
      cla;
      plot(axes,handles.x,handles.y,'k');        
  otherwise
      message = sprintf('No case for slider value of %d', sliderValue);
      uiwait(warndlg(message));
end

I don't know what I'm doing wrong. I just want to scroll through 3 plots.

Thanks,

Amanda

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Answer 1

Image Analyst 2012-9-3

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https://ww2.mathworks.cn/matlabcentral/answers/47299-slider-code-only-displaying-one-image#answer_57762

在 MATLAB Online 中打开

You can't set up the parameters for the slider in it's callback! You just set the value to 3 so matter what your user sets it to, you overwrite it with 3. Put the settings for min, max, and initial value in the Property Inspector in GUIDE, not in the callback.

Secondly, you aren't displaying an image, you're plotting some data in a line plot. and again, you specified that data in the callback so it will be the same every time, regardless of what the user is doing with the slider.

Finally, axes() is a built in function, so you don't want to do this:

axes = handles.axes1;

or else you will be blowing away the built in function. Just pass handles.axes1 directly into plot.

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Image Analyst 2012-9-3

That would work for x and y, though it will just plot a 45 degree line. The handles line is not needed. If you omit the semicolon though, it will print out all values of all the members of handles to the command window.

Amanda 2012-9-3