Cut a bezier path in inner and outer circle

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45toby12
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Cut a bezier path in inner and outer circle

Postby 45toby12 » Sun Nov 27, 2011 4:26 am

Hi all,

I' am new to inkscape and have problems to get all my path operations working. Several other problems could be solved with google, but now this one seems to be a bit tricky:

As you can see in the picture below the inner and outer circle are joined in a single path . This was made with two single circles and the Path --> Difference operation. The triangle down in the picture is also part of the path. The same should be done with the upper triangle. Unfortunately I dont' know I did this... ;)
Ok so I want to cut/intersect path number one with the upper triangle. The yellow marked nodes should now be joined with path number one so that I can remove the path between node 10 and 20.

At the moment the upper triangle sticks/is snapped to the path 1 but I cannot remove the path between 10 and 20. It seems like the two nodes only lay above each other...
Thanks for your help!

Image

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brynn
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Re: Cut a bezier path in inner and outer circle

Postby brynn » Sun Nov 27, 2011 5:54 am

Welcome to InkscapeForum!

In the yellow rectangle at node 10, there should be at least one node, the corner of the triangle. What I can't see, is whether there is a node on the circle there as well. If there's not one there, you'll need to put one there, before you can remove the path between node 10 and node 20. You can do this by double-clicking with the Node tool in the place where you want to put the node. Then click on the segment that you want to remove. This will select node 10 (or the new node, if you added one) and node 20. Next click "Delete segment between 2 non-endpoint nodes" which is the 6th button from the left on the Node tool control bar.

I'm not really clear about some of the other things you said. You won't be able to join the corner node of the triangle to the circle path. Not so that it's all one path. You can use Path menu > Combine to make the subpaths of the same compound path. But a node can only have 1 or 2 segments attached to it. No more. So combining the paths may be what you're asking for. But I don't understand why you need to remove the segment on the circle between nodes 10 and 20, to accomplish this.

It's possible that I have entirely misunderstood??

45toby12
Posts: 6
Joined: Sun Nov 27, 2011 4:00 am

Re: Cut a bezier path in inner and outer circle

Postby 45toby12 » Sun Nov 27, 2011 6:38 am

Maybe my english is too bad :)
I want to build a logo with two parallel circles which form three partial arrows. The circle sections are the arrow borders.
Here is another picture:
Image

All you can see is one path. I want to delete the path between the upper node in the green rectangle and the node in the yellow rectangle. But what really gets deleted is the path between the nodes in the two green rectangles... I think the yellow rectangle node is not "really" connected to the bezier path. I would like to do a melt of this yellow node and its underlying path so that i can do the normal delte operations....
Is it a problem concering the bezier path?!

45toby12
Posts: 6
Joined: Sun Nov 27, 2011 4:00 am

Re: Cut a bezier path in inner and outer circle

Postby 45toby12 » Sun Nov 27, 2011 7:11 am

Perhaps this picture shows my plans better:

Image

I want to delete the section between the upper "green"node and the "yellow" node. At the moment this is not possible to me, because it seems that the yellow one is not really connected to the bezier path. I can only delete the path between the two green nodes! The combine operation has already been done...

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brynn
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Re: Cut a bezier path in inner and outer circle

Postby brynn » Sun Nov 27, 2011 7:23 am

You'll need to put a node on the circle path at exactly the same place as the node in the yellow rectangle. The node in the yellow rectangle is the corner of the triangle. You could move that node away a bit, to see that it's not on the circle path, and then use Undo. So you need to put a new node on the circle path in exactly the same place. You can use snapping to make sure it's in exactly that place.

If the node at the top green rectangle is an end node, you won't have to use "delete segment between nodes" button. Just delete that one node, and the segment will be deleted back to the next node, which is the new node that you have to make.

45toby12
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Joined: Sun Nov 27, 2011 4:00 am

Re: Cut a bezier path in inner and outer circle

Postby 45toby12 » Sun Nov 27, 2011 8:19 am

Ok I can delete them now. But the snapping does not work with the create node more exactly. All snapping options on the right side (vertically listed) are enabled...

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brynn
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Re: Cut a bezier path in inner and outer circle

Postby brynn » Sun Nov 27, 2011 8:11 pm

I'm not sure what you mean.
Do you mean that you can't snap the triangle to the new node? Or do you mean that snapping did not make the node placement correct?

45toby12
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Re: Cut a bezier path in inner and outer circle

Postby 45toby12 » Sun Nov 27, 2011 11:04 pm

The new node should snap exactly where the triangle node is! Is this possible. At the moment I can go anywhere near the triangle node with the "add node" tool and the tool does not snap to my bezier path....

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brynn
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Re: Cut a bezier path in inner and outer circle

Postby brynn » Mon Nov 28, 2011 2:02 am

Ok, the snap tool can be tricky to use. Believe me, it took me a couple of years to get a really good handle on it. And actually, I just realized that I was wrong about being able to use snapping to do this. Still learning I guess :roll: . (You can place nodes while using the Pen tool in this manner, and I assumed you could do the same with the Node tool. But I can't get it to work either.)

There are a couple of ways to go, in light of this newly learned lesson. I would recomment zooming way, way in -- like to 15,000%. Then place the new node as close as you can to the other node. Next, with the same snap settings as below, just drag the node that tiny distance, and it should snap. An alternative to snapping, in case it's still giving you fits, you can collect the triangle node's precise X,Y coordinates, by selecting it, then looking on the Node tool control bar for the coordinates. Copy those, then select the new node, and paste the new values.

Click these snap settings: Enable snapping (1st button on snap control bar), Snap nodes or handles and Snap to cusp nodes. So those 3, and all else should be disengaged. Now go to Document Properties > Snap tab > Snap to objects. Make sure that it's set either to Always snap, or Snap when closer than with a value of 20 or more. (Lower values make a weaker snap, higher values make a stronger snap, and always snap is the strongest of all. I would recommend 20.

45toby12
Posts: 6
Joined: Sun Nov 27, 2011 4:00 am

Re: Cut a bezier path in inner and outer circle

Postby 45toby12 » Mon Nov 28, 2011 3:56 am

Thanks for your detailed explanation.
I solved it by manually creating the new node as near as possible to the triangle node....


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