How do I connect two points?

Hi peoples, I'm developing a mobile game that consists of connecting dots. I've researched similar topics, but none can solve my problem.

Problem:

I have difficulty connecting points after a collision. For example, I did the part where the player colliding with the object creates the line of the object in question until the player's finger / mouse.

This is what I currently have.

That is the problem that I have faced.

Every time it collides, the Line object is created from the star to the blue point, but I can't definitively create the line from one star to another.

If I could identify the number of collisions it would be much better.

I hope it's understandable

Sorry for the delay. The method you showed is exactly what you needed. However, when I went to apply it to my project, I found it difficult, because the objects are in motion, this was very complicated.

If you can better understand the logic of your programming, I feel that I could solve this, thank you for the answer.

If I need to see how the game is doing, I will make the game file available.

Thank you for your help.

https://drive.google.com/open?id=1JN5HWPTjUkIUvbK61q55j7EG7tZJOqBZ

You only need to pin the line to starting dot

imgur.com/a/Yuookrk

then always set its angle to end dot.

imgur.com/a/goiPaTH