Connect all the blocks without going over a polyline

[jtm2020hyo]

It's possible connect all selected blocks with a polyline but without going over a polyline.?

[dlanorh · Accepted solution]

Please see attached. I think this is what you are after. You need to select the start block, then all the blocks you want to connect.

[jtm2020hyo]

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@dlanorh wrote:

Please see attached. I think this is what you are after. You need to select the start block, then all the blocks you want to connect.

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awesome. I did not think this might be solver with one polyline. I will test it in real-world problems. thanks for you help

[dlanorh]

The returned polyline is normally closed bu I have included a start block selection where the polyline is broken to provide a start and end to the polyline. If you don't want this let me know.

[jtm2020hyo]

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@dlanorh wrote:
The returned polyline is normally closed bu I have included a start block selection where the polyline is broken to provide a start and end to the polyline. If you don't want this let me know.

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can you give me that options in the same list-routine? 

I want to try to test it in my work.

[dlanorh]

Should be relatively easy.

One think I forgot to mention. With large sets the routine is not infallible and may return a polyline with a single intersection. I am trying to rectify this, but the solution is a bit more problematic with large sets.

[dlanorh · Accepted solution]

Attached is revised lisp to allow an open or closed polyline.

I have developed the lisp to include an local error routine. The routine also enables dynamic mode and the dynamic prompt. Choices will now be available at the cursor with selection by mouse enabled. These are all reset on exit.

[jtm2020hyo]

thanks for your reply. this work for me.

...But I fix 2 errors. 

first, I tried to select one block (when lisp asks to select a point) and select the same block again (when lisp asks to selected blocks), then my AutoCAD crash or load something for ever.

second is the image here below. 

What I did was mark the block marked here below then select all block inside the circle.

I tried again but now work no errors. I don't know what happened but maybe help you in developing the code.

PD: attached file where i tested your last lisp version

[dlanorh]

Sorry, I didn't check the Selection Set size. You must choose 2 different Blocks to connect otherwise it crashes because it cannot construct a zero length pline.

The minimum set size for the convex hull code from Lee Mac is 4 different Blocks, otherwise it just returns the input list .

I will insert additional checks and test tomorrow.

Still haven't got the intersection problem fixed, it is progressing, but work keeps getting in the way.

[dlanorh · Accepted solution]

Attached is the updated Lisp, lightly tested.

This should now avoid endless loops, but I haven't got a fix for the intersection problem yet.

If you select the Open Polyline Option your will be asked to select a Start Block. This is the block from which the finished polyline will start. This block is automatically added to the selection set if it not selected as part of the other blocks selection set.

The main selection set prompt has now been changed and is related to the polyline option selected.

If "Open" it will read "Select Additional Blocks to Connect"

If "Closed" it will read "Select All Blocks to Connect".

For either option the selection set must contain a MINIMUM of two different blocks, this is calculated AFTER the start block is added (if the "Open" option is selected).

An alert box will popup informing you if there are insufficient blocks in the selection set. The selection set is then cleared and you will be asked to select again.

[jtm2020hyo]

thanks for your updated version.

can be possible to connect block between nearest points?