use imline() to draw a draggable line with fixed length

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Yinan Xuan
Yinan Xuan 2018-8-24
评论： Yinan Xuan 2018-8-28
I have been thinking about using a position constraint function which is in circle shape with its center at one end of the line. In that case, I can drag the other end so that every drag will result in a line of length equal to radius of the circle. However, I only found makeConstrainToRectFcn which makes the constraint rectangle but not circle.
Or is there other way to achieve the same goals? Thank you very much!

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Naman Chaturvedi
Naman Chaturvedi 2018-8-28
Hello Yinan,
You can use the addNewPositionCallback function to acieve your constraint goal. The constraint function may calculate the slope of the line segment and accord to the radius and slope, find the position of second point.
Hope this helps.
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Yinan Xuan
Yinan Xuan 2018-8-28
Thank you for your reply! I managed to work around this using basically the same logic. I created another new line based on the slope and radius and deleted the old one right after.

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