drawrectangle, drawcircle, drawellipse and drawpolyon draw region of interest at wrong position.

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OkinawaDolphin 2021-2-1

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回答： MosGeo 2021-10-5

When I try to draw an interactive rectangle on a GUI with an image, the rectangle is never drawn where I want it to be. In fact, it is drawn with a big offset in y direction. How can I draw an interactive rectangle, circle, ellipse or polygon at the right position?

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Image Analyst 2021-2-1

在 MATLAB Online 中打开

Does this correctly report the coordinates:

rgbImage = imread('peppers.png');
h = imshow(rgbImage);
axis('on', 'image');
title('Drag out a rectangle', 'FontSize', 15);
ROI = drawrectangle('Color', 'r')
x1 = ROI.Position(1);
x2 = x1 + ROI.Position(3) - 1;
y1 = ROI.Position(2);
y2 = y1 + ROI.Position(4) - 1;
caption = sprintf('x1 = %.1f, x2 = %.1f, y1 = %.1f, y2 = %.1f',...
	x1, x2, y1, y2)
title(caption, 'FontSize', 15);

OkinawaDolphin 2021-2-8

The positions are reported correctly.

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Answer 1

Christian Wrobel 2021-2-5

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I had the same Problem, when I was using the AppDesigner (Matlab 2019a). I used a GridLayout to organize the axes and some surrounding UI-Objects within a tab. I've found out, that the padding of the GridLayout of the Tab was causing the Offset (Parent of axes). I changed the padding to [0,0,0,0] and the offset was gone. When I increased the padding of GridLayout the offset got even worse. Hope, this may help you.

Best Christian

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OkinawaDolphin 2021-2-8

I do not have any GridLayout on my GUI. In fact, drawrectangle and similar functions appear to work arbitrarily. As long as I do not start App Designer these functions work fine. Once I start App Designer the offset occurs, regardless of the method to start my app.

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