3

In an Inkscape file I got from somebody I found the following: enter image description here

On the right there are arcs of ellipses (not paths), and on the left there are 4-node bezier paths each perfectly corresponding to the inside of the set of four ellipses next to it. I have been trying to do the same: I create four arcs of ellipses and try to convert the inside region to a single path. Given the above examples I guess there must be a very quick way to do it, but I can't figure it out.

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You can do it in the following steps:

  1. Make full ellipses (e.g. 3 ellipses)
  2. Take the complement for the green and red ellipses (Ctrl -). It will automatically produce a path.
  3. Break apart the result and delete the bottom part if you don't need it (Ctrl Shift K).
  4. Take the union (Ctrl *)

enter image description here

  • A bit tedious, but it's the only option I can imagine. Sometimes it's hard to think of which boolean operations should be used, but I guess I will be able to handle all cases this way. – user30521 Sep 28 '14 at 22:57
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A very fast method to get an object of an inner area of several overlapping objects is the bucket fill tool.enter image description here.

This is how it works:

  1. Draw overlapping objects:

    enter image description here

  2. Apply Bucket Fill:

    enter image description here

  3. Move new object from bucket-fill or apply custom stroke and fill:

    enter image description here enter image description here

  • I was aware of the bucket fill (I should have mentioned it) but unfortunately this does not fill the shape perfectly. I guess the solution with boolean path operations is the best. +1 though for the effort, I'm happy to see an active community on this SE site. – user30521 Sep 28 '14 at 22:41

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