How to rotate a line using Matlab?

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Makrim
Makrim 2015-5-16
编辑： Habtamu Tesfaw 2021-3-12
Suppose I have an image I and a line h1. Using Matlab, I can draw the line (or segment) like this (in red) :
h1 = plot( [l1 l1],[20 100], 'r');
Now I want to rotate the image I with an angle of 45°. So I used imrotate like this:
IR = imrotate(I,45);
Now, I want to rotate the line, how to do that using Matlab ?
PS: I found the function rotate. I am trying this, but it is not working !
rotate(h1,[1 1],45);

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采纳的回答

Image Analyst
Image Analyst 2015-5-16
imrotate() rotates an entire image, not a line you created with line() or plot(). You need to take your points and multiply by the rotation matrix - you know, the sin and cos thing you learned in your linear algebra class in college. Then call line() or plot() again with the rotated coordinates.

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Habtamu Tesfaw
Habtamu Tesfaw 2021-3-12
编辑：Habtamu Tesfaw 2021-3-12
here is a simple package that can do the job '
https://www.mathworks.com/matlabcentral/fileexchange/88748-lrotate?s_tid=srchtitle

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