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Adding a point where lines cross

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EdoP

Technical User
Feb 10, 2005
1
NL
Hello all,

I am trying to make a map in Illustrator, and a recurring problem I have is how to add a point where two lines cross, so I can fill up some of the forms that are created by the lines (=roads) to make a canal, for example.
Put simply, this is what I want:
If I make an X by drawing two seperate lines, I want to add a point where the lines cross. I can do this by selecting each line and adding a point with the pen tool and then join the two points, but this is very tiresome (since the points need to overlap). There must (?) be a quicker way.
Then I want to draw a square around the X so that I have 4 triangles, and I want to fill one of these triangles. How does Illustrator know that one of these triangles is the shape that I want to fill? I am looking for some kind of pathfinder-add-to-shape tool, but that does not work on lines. Converting the lines to shapes is not an option, because then I cannot change the thickness of a line easily.
Any suggestions?
Cheers!
 
Can't you use the intersect filter to change the fills of your desired "triangles?
 
If you use shapes, can't you change the line thickness by changing the stroke weight of the selected shape (s)?
 
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