Calculate distance between 2 points (read)?

2014 3 27
2 个回答
更新时间：2014 3 27
14 次查看（30 天）

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I was asked to write a simple program that reads the coordinates of 2 points and then calculates the distance between them.
I really don't know where to start im a complete rookie so a thorough explanation is appreciated.
Thank you!

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回答（2 个）

Image Analyst
Image Analyst 2014-3-27

0 个投票

How about using imdistline() or improfile() if you have the Image Processing Toolbox.
See attached spatial calibration demo.

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Erwin Folkesang
Erwin Folkesang 2014-3-27
But how do you first create 2 points in the middle of nowhere and then use imdistline() to calculate the distance between them? (sorry for rookie question)
Image Analyst
Image Analyst 2014-3-27
This is for when you are displaying an image. You click on each end of the line. Click one end and get a rubber band line, then click on the other end. What kind of display are you wanting to click on????

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Star Strider
Star Strider 2014-3-27
编辑：Star Strider 2014-3-27

0 个投票

You can use the hypot function, or write a version of your own:
x(1,:) = rand(2,1);
x(2,:) = rand(2,1)*10;
dx = diff(x,1)
d = hypot(dx(1), dx(2))
figure(1)
plot(x(1,1), x(1,2), 'pb')
hold on
plot(x(2,1), x(2,2), 'pb')
plot([x(1,1) x(2,1)], [x(1,2) x(2,2)], '-r')
hold off
text(x(1,1),x(1,2), sprintf(' (%.2f, %.2f)', x(1,:)), 'FontSize',8)
text(x(2,1),x(2,2), sprintf(' (%.2f, %.2f)', x(2,:)), 'FontSize',8)
mnx = mean(x,1);
text(mnx(1),mnx(2), sprintf(' Distance = %.2f',d), 'FontSize',8)
xlabel('x \rightarrow')
ylabel('y \rightarrow')
axis([xlim+[-.2 .2] ylim+[-.2 .2]])
grid
EDIT: Added plot

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