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Helper shape poly line results in closed poly - after vertex deletes

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mjl1966

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Sometimes, when I use an ellipse to generate a poly line and then delete vertexes to create an arc, ADE closes the arc to create a polygon. I can't determine what factor is causing it to do this. Sometimes it does it. Sometimes it doesn't. However, when it does, my line is rendered useless and I have to start over from scratch. This is a situation where arc is not suitable since arc is always a circle segment and most curves don't conform to a pure arc.

Is it known what factor determines when a string of vertexes create a line vs. a closed poly?

Thanks.
 
scruffyduck

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What line? I assume you mean ADE is closing the GP line? What is closing the line ADE itself or the GP Editor?
 
GHD

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By definition, an ellipse is a closed contour. There isn't an option to create an elliptical arc.
 
scruffyduck

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Is it known what factor determines when a string of vertexes create a line vs. a closed poly?
Click to expand...

In ADE it depends what you select from the Right Click Menu. If it is a poly then the result is a closed shape and if it is a line then it is open.
 
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mjl1966

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scruffyduck said:
In ADE it depends what you select from the Right Click Menu. If it is a poly then the result is a closed shape and if it is a line then it is open.
Click to expand...

1. add helper shape: ellipse.
2. Right click and select "make custom ground line"
3. Delete vertices to create arc.
4. End vertices are connected, making a closed polygon. (This is the problem)

I have created an arc this way where the end vertices didn't connect. The problem is there is no way to know when they connect and when they don't. I'm asking for a line (curve actually) but getting a poly.
 
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mjl1966

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scruffyduck said:
In ADE it depends what you select from the Right Click Menu. If it is a poly then the result is a closed shape and if it is a line then it is open.
Click to expand...

Golf-HotelDelta said:
By definition, an ellipse is a closed contour. There isn't an option to create an elliptical arc.
Click to expand...

No, but there is an option to select "create custom line" from the context menu for an ellipse helper shape. And I've seen it work. A "line" corresponding to an ellipse would be an elliptical arc by definition.
 
scruffyduck

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OK I will test it.

EDIT

It is doing what it was designed to do - creating a closed line - it is not a poly but a line. This is true of any closed helper shape that is converted into a custom ground line. This may not be the behaviour you wanted but that is how it is. An open line can be drawn by hand using a helper shape as a guide or an arc will create an open line. At the moment an arc is constrained to a circle but we have plans to create other arcs and curve helpers
 
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Gaiiden

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scruffyduck said:
At the moment an arc is constrained to a circle but we have plans to create other arcs and curve helpers
Click to expand...

Good to hear. This post is the exact "problem" I had when I tried to make an arc line out of an ellipse helper shape when I realized the arc helper only worked in a circle. Look forward to the elliptical arc helper, in the meantime it's still copy/past vertices...
 
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mjl1966

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scruffyduck said:
OK I will test it.

EDIT

It is doing what it was designed to do - creating a closed line - it is not a poly but a line. This is true of any closed helper shape that is converted into a custom ground line. This may not be the behaviour you wanted but that is how it is. An open line can be drawn by hand using a helper shape as a guide or an arc will create an open line. At the moment an arc is constrained to a circle but we have plans to create other arcs and curve helpers
Click to expand...

It will create an arc if the sweep is less than 45 degrees, which we'll call a bonus feature. :) I do see your point about a closed line vs. arc. I don't know why I was thinking a line had to be open to be called a line. (!) Sorry to spin your wheels, Jon. I should have left this one in the hangar.

I've found that the arc tool provided is actually pretty good once you get the hang of resizing and positioning. Elliptical version would be brilliant.
 
scruffyduck

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No worries. An elliptical arc is on the list.

Sent from my Sony Xperia with Tapatalk 2
 
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