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I want to have the yellow and red lines 'flowing' exactly alongside the blue line, eliminating the white space between the bends but without distorting them. If I drag the anchor points, it ruins the bend.

enter image description here

All 3 of them are shapes which each shape being a 'line' of 2px wide. The width of the shaped line shouldn't change.

How do I achieve this?

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You could use an Art Brush for this.

  1. Draw three rectangles, and fill each with a colour.

  2. Select all, and drag and drop them into the brushes panel

  3. When the New Brush dialog appears, choose "Art Brush", click OK

  4. Draw a line with curved corners, apply the Art Brush you previously made

Exampleenter image description here

Edit: As for making sure the rectangles are 2px high, you can change the units in preferences to pixels. Then draw a rectangle. In the bar along the top you can change the height to 2px.

enter image description here

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  • Thanks for answer. Interesting approach. How do I make sure the lines are each 2px thick? I'll add that requirement to my question. – Gerlof Leuhof Jan 17 at 13:41
  • @GerlofLeuhof - I added an edit to my answer. – Billy Kerr Jan 17 at 13:52
  • Thank you. It's close to working. I'm getting a strange first line though, see this screenshot: i.imgur.com/p9fzSHG.png – Gerlof Leuhof Jan 17 at 14:50
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    @GerlofLeuhof Looks like the curve is too tight. Although this solution works, it can't work miracles that go beyond what's physically possible. You will need to open up the curve a little. Here I used the corner widget functionality to create the curves - since these can be re-adjusted later at any time. – Billy Kerr Jan 17 at 15:07

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