Ho to delete the image from the axes?

Question

Animesh 2013-12-23

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/110543-ho-to-delete-the-image-from-the-axes

评论： Image Analyst 2014-2-4

采纳的回答： Image Analyst

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I want to remove the image from the axes(say axes1) upon clicking a button keeping the axes intact.

I have tried using

   children=get(handles.axes1, 'children');
   delete(children);
    and other things but it completely removes the axes.
Can anyone help??
Thanx in advance

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Answer 1

Image Analyst 2013-12-23

3
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https://ww2.mathworks.cn/matlabcentral/answers/110543-ho-to-delete-the-image-from-the-axes#answer_119181

编辑：Image Analyst 2013-12-23

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You need to find the image in the axes with findobj() and then delete it. Like this:

axesHandlesToChildObjects = findobj(h, 'Type', 'image');
if ~isempty(axesHandlesToChildObjects)
  delete(axesHandlesToChildObjects);
end

You can't just call cla() or it will delete everything such as text, arrows, overlays, or other annotation you added. Try this full demo:

function test3
% Display an image.
imshow('moon.tif');
axis on;
% Add some text.
text(100,250, 'Moon', 'FontSize', 30, 'Color', 'r');
promptMessage = sprintf('Do you want to clear the image only?');
titleBarCaption = 'Continue?';
button = questdlg(promptMessage, titleBarCaption, 'OK', 'Cancel', 'OK');
if strcmpi(button, 'OK')
  % Get rid of image from current axes, but leave text.
  ClearImagesFromAxes(gca)
end
%=====================================================================
% Erases all images from the axes.
function ClearImagesFromAxes(h)
  axesHandlesToChildObjects = findobj(h, 'Type', 'image');
  if ~isempty(axesHandlesToChildObjects)
    delete(axesHandlesToChildObjects);
  end
  return; % from ClearImagesFromAxes

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Image Analyst 2014-1-8

Try "axis on" for the second axis too. Your axis on only applied to the current axes, which presumably was your axes1, so it never got turned on for axes2.

Animesh 2014-1-9

Thanks sir. It worked by adding axes(handles.axes2);axis on

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Answer 2

Azzi Abdelmalek 2013-12-23

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https://ww2.mathworks.cn/matlabcentral/answers/110543-ho-to-delete-the-image-from-the-axes#answer_119180

在 MATLAB Online 中打开

Try

cla(handles.axes1)

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Jean Bilheux 2014-2-3

I didn't think about that one ('cla') and it worked great for me !

Image Analyst 2014-2-4

But it clears more than just the image (which is what the original poster wanted to restrict it to). If you want to clear everything, then that's fine - it will work.

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