fix only one end of imline object

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Yinan Xuan
Yinan Xuan 2018-8-24
评论： Image Analyst 2018-8-24
I have checked the setConstrainedPosition feature, but it seems to only constrain both ends. What I want to achieve is to fix one end of imline object while leave the other end freely movable. Thanks in advance!

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回答（1 个）

Image Analyst
Image Analyst 2018-8-24
I don't think you can do that with imline(). What you'd have to do is to use the mouse move callback to erase the prior line and draw a new line, with line() not imline(), from the fixed point to the current point where the cursor is.
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Yinan Xuan
Yinan Xuan 2018-8-24
Thanks for your reply! However, in the case where there are two lines present at the same time. How can I choose which one to "drag" in your method?
Image Analyst
Image Analyst 2018-8-24
You have the current point. Then you can look up "point line distance" on the web for a formula. I'd move which ever line is closest to your current point.

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