ROI - limiting the length of a crosshair

Question

Teshan Rezel 2021-3-19

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https://ww2.mathworks.cn/matlabcentral/answers/778032-roi-limiting-the-length-of-a-crosshair

评论： Teshan Rezel 2021-3-22

Hi there,

I am currently displaying a circle and crosshair together on one image. However, is it possible to do this without showing the whole length of the crosshair? I want it to end at the radius of the circle.

Below is an image of what I'm currently getting. I'd like to make it such that the crosshair ROI doesn't extend past the circle ROI. Is this possible?

thanks

h = images.roi.Crosshair(gca, 'Position', position6, 'Color', 'w'); 
h = images.roi.Circle(gca,'Center', position6,'Radius',100, 'Color', 'w', 'FaceAlpha', 0);
h = images.roi.Crosshair(gca, 'Position', position7, 'Color', 'w'); 
h = images.roi.Circle(gca,'Center', position7,'Radius',100, 'Color', 'w', 'FaceAlpha', 0);

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Image Analyst 2021-3-19

You forgot to show us the commands you're using to show the graphics in the overlay.

Teshan Rezel 2021-3-19

@Image Analyst good point, I've updated it!

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Answer 1

Tarunbir Gambhir 2021-3-22

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/778032-roi-limiting-the-length-of-a-crosshair#answer_654547

编辑：Tarunbir Gambhir 2021-3-22

在 MATLAB Online 中打开

I see that you are trying to shorten the size/length of the displayed crosshair. I do not see any property of the crosshair function that might allow you to do so. I have notified the concerned developers regarding this request.

If you just want to display the crosshair on top of the image, you could try the following as a workaround to it:

hold on;
plot(position6(1),position6(2),'r+', 'MarkerSize', 50);
h = images.roi.Circle(gca,'Center', position6,'Radius',100, 'Color', 'w', 'FaceAlpha', 0);