Make a line split when overlaping other object.

Hi im trying to make this, i took pictures because its easier for me to explain it.

First image, line should go all the way to mouse position

Second image, line should point to mouse position, but it should go all the way till it touch or overlaps a solid. And so on on the next images.

From another topic I recently posted in:

Here's a very old but working example by R0J0hound

It's for rotating lasers, but will work for this purpose too..

http://dl.dropbox.com/u/5426011/c2/laser.capx

Thank you, now it works.