How would I manipulate only a single stroke of a rectangle while leaving the strokes unchanged?
For example, if I have a line and use
effects > Distort & Transform > ZigZag, the line changes to a wave.
How would I select only the top path/stroke/line of the rectangle and apply the same effects of ZigZag to that line only?
I tried to play with it but it changes all the lines as well as the top. I also tried the scissors tool, cut the path, apply the effect and rejoin them. It works but when I rejoin them, again all the lines gets converted to zigzag.
Effects are applied to the entire object. There is no method which allows a user to apply an effect to only one section of a path (open or closed).
You would need to delete the section of the square you want zig zagged, expand your extra path so that the effect is no longer "live' then reconnect the corner points to the new path.
I'm sure you've figured this out by now, as it's been two years, to those of you searching this, there is nothing that can't be done with illustrator. It's pretty easy.
Make a zig zag line the width or height you want your rectangle
Object > Expand
Then use the pen to draw the other three sides, starting on an end point of the zig zag line and connecting back at the other end.