Finding and plotting evenly-spaced points along a vector

Question

Diondra 2015-11-5

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/253245-finding-and-plotting-evenly-spaced-points-along-a-vector

回答： dpb 2015-11-5

I've plotted a centerline along an ellipse in my image by using ginput to select 2 points and then drawing the line connecting them. Next, I would like to figure out the coordinates of 10 evenly spaced points along this line and plot them on top of the current image, creating a spine of 12 points (10 + the 2 original) along the ellipse. How would I implement this? The ultimate goal is to create 11 even-length vectors, one between every 2 points along the spine. My current code is below:

        I = data(:,:,i);
        imshow(I, []);
        hold on
        [x, y] = ginput(2);
        plot(x, y, '*')
        pause(1);
        plot(x, y, 'r')
        pause(1)
        hold off
        pause(5);
        close all

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Answer 1

Federico Becattini 2015-11-5

1
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https://ww2.mathworks.cn/matlabcentral/answers/253245-finding-and-plotting-evenly-spaced-points-along-a-vector#answer_198667

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If I understood correctly this is what you are looking for:

 num_points = 10;
 for i=1:num_points
     points_x(i)=(x(1)*i+x(2)*(num_points-i+1))/(num_points+1);
     points_y(i)=(y(1)*i+y(2)*(num_points-i+1))/(num_points+1);
 end
 plot(points_x, points_y, '*c')