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I have a serious problem. I want to change the weight of multiple lines but when I try do that the distance between them disapears and overlap. In straight lines that doesn´t happens, but in diagonal lines this happens always!!! Please can annyone help me please??!!!

Before change stroke

After change stroke

Thank You

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This seems like a metro-map to me :) and I think this might just be a question of grouping and scaling. – Benteh Aug 7 '14 at 15:09
This might help: – Benteh Aug 7 '14 at 15:24
up vote 2 down vote accepted

When a set of lines go from horizontal to a diagonal, all your points are stacked along the same vertical:

lines demonstration

In order to maintain the same thickness and spacing for a diagonal line, your points must line up on an angle that is relational to the magnitude of the angle of the change in direction:

lines demonstration 2

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A good way to achieve the neat line-up is using a closed shape and using Object > Path > Offset Path.... – Vincent Aug 7 '14 at 15:51
Agreed offset is the way to go. You can get the angle by expanding the stroke and see where the vertices are, – joojaa Aug 7 '14 at 16:49

Most objects in Illustrator are unaware of their surrounding objects. There is no way to automatically move any object based on the stroke size of any surrounding object.

You're best bet is to manually adjust any overlapping you do not want or to select all and use the Scale Tool or Object > Transform > Scale menu item, ensuring Scale Strokes & Effects is checked on the Transform Panel. If you scale the strokes rather than increasing their weights manually you'll get thicker strokes and the distance between the strokes will also scale simultaneously. It is simply more difficult to target a specific stroke weight when using the scale method.

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