How to interactively display the size of ROI created by imellipse?

Question

YZ 2017-3-2

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/327765-how-to-interactively-display-the-size-of-roi-created-by-imellipse

编辑： Matt J 2017-3-2

I want to draw a ROI on one image with imellipse and display the size of ROI, so that I can adjust the size of ROI to the desired size. The following is my code:

figure(1)
h_im = imshow(myimage);
roi_small = imellipse;
BW_small_temp = sum(sum(createMask(roi_small, h_im)));
BW_small_temp_area = BW_small_temp * info_MTL.(current_name).PixelSpacing(1)*info_MTL.(current_name).PixelSpacing(2);
txt1 = [num2str(BW_small_temp_area) ' mm^2'];
text(256,256,txt1)
wait_small = wait(roi_small);
pos_small = getPosition(roi_small);

This code can only display the ROI size at the first attempt. By adjusting the size of ROI, the text in the figure won't change. Please see the picture:

Is there a way to display the text of ROI size interactively, such that when adjusting the ROI size, the text of ROI size also changes? Many thanks!

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Answer 1

Matt J 2017-3-2

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https://ww2.mathworks.cn/matlabcentral/answers/327765-how-to-interactively-display-the-size-of-roi-created-by-imellipse#answer_257013

编辑：Matt J 2017-3-2

The function you use to display the area can be attached to roi_small using its addNewPositionCallback() method. This function will then be called every time the ROI is moved or re-sized.