topic Re: Select objects inside block with a polygon with using .net in .NET Forum

Select objects inside block with a polygon with using .net

anhtrung — Mon, 20 Jul 2020 02:05:31 GMT

Hi anybody,

I have a question and who is help me to solve this problem. That is a have a block and it's contain objects, and it's also have a polyline into block. So, i want to get all object inside block with inside polyline. how to create new function or new any idea help to me.

I'm using C.#

Thanks.

Re: Select objects inside block with a polygon with using .net

Anonymous — Thu, 30 Jul 2020 13:46:17 GMT

You could use the Editor. GetNestedEntity() method to get the line.

The objectId is the one the line within the block definition.

using (var tr = db.TransactionManager.StartTransaction())

{

PromptNestedEntityResult result;

while (true)

{

result = ed.GetNestedEntity("\nSelect a line within a block reference: ");

// user cancelled

if (result.Status != PromptStatus.OK)

{

return;

}

// check if the selected object is a line

if (result.ObjectId.ObjectClass.DxfName == "LINE")

{

// check if the line is nested

if (result.GetContainers().Length == 0)

{

ed.WriteMessage("\nThe selected line is not nested in a block reference.");

}

else

{

break;

}

else

{

ed.WriteMessage("\nThe selected entity is not a line.");

}

// open the line of the block defintion

var line = (Line)tr.GetObject(result.ObjectId, OpenMode.ForRead);

// compute the transformation matrix from the containers

var xform = result.GetContainers()

.Select(id => (BlockReference)tr.GetObject(id, OpenMode.ForRead))

.Select(br => br.BlockTransform)

.Aggregate((m1, m2) => m2 * m1);

// transform the line start and ensd points

var startPoint = line.StartPoint.TransformBy(xform);

var endPoint = line.EndPoint.TransformBy(xform);

ed.WriteMessage($"\nStart point: {startPoint}\nEnd point: {endPoint}");

tr.Commit();

}

Feel free to contact us is need additional assistance. @anhtrung

Re: Select objects inside block with a polygon with using .net

anhtrung — Wed, 05 Aug 2020 08:24:12 GMT

Thanks for your answer to me.

This is a function only for one object. I mean want to get objects inside polyline and this objects into a block.

Re: Select objects inside block with a polygon with using .net

_gile — Wed, 05 Aug 2020 08:49:04 GMT

Hi,

You should describe what you want to achieve with more details because block references (BlockReference) do not contain entities, they're only inserted references to a block definition (BlockTableRecord).

Only the block definition contains the entites.

Re: Select objects inside block with a polygon with using .net

anhtrung — Wed, 05 Aug 2020 12:31:22 GMT

Thanks for your information.

Like you can see image below. I have a block reference and i want to get objects inside the yellow polyline.

File attached.

Re: Select objects inside block with a polygon with using .net

_gile — Wed, 05 Aug 2020 14:42:41 GMT

As I said, these entities do not belong to the block reference which is only a geometric representation of the block definition. So, you have to elaborate what you mean by: "get objects" and about the context inputs.

Re: Select objects inside block with a polygon with using .net

anhtrung — Thu, 06 Aug 2020 02:07:03 GMT

I mean, i can define get points boundary yellow plolyline, but i want to get objects inside this polyline, and all this objects into block reference.

Re: Select objects inside block with a polygon with using .net

_gile — Thu, 06 Aug 2020 06:07:58 GMT

Sorry, I'm not able to help you further

It looks like we do not understand each other

Re: Select objects inside block with a polygon with using .net

GiaBach — Thu, 06 Aug 2020 07:29:57 GMT

Hi Trung,

Not sure I fully understand your request, just make a snippet.

public static void GetPlinesInside(BlockReference bref) { List<Polyline> plLst = new List<Polyline>(); List<Polyline> boundaryLst = new List<Polyline>(); DBObjectCollection objs = new DBObjectCollection(); bref.Explode(objs); foreach (DBObject obj in objs) { if (obj is Polyline pl) { if (pl.ColorIndex == 2) boundaryLst.Add(pl); else plLst.Add(pl); } } if (boundaryLst.Count == 1) { Polyline boundary = boundaryLst[0]; foreach (Polyline pl in plLst) { // checking if the pl is inside boundary, refer the solution of Gile: // https://forums.autodesk.com/t5/net/how-to-check-if-a-point2d-is-inside-a-polyline-or-not/m-p/8234741 if (isInside(boundary, pl)) { // do something here } } } }

Re: Select objects inside block with a polygon with using .net

anhtrung — Fri, 07 Aug 2020 01:10:54 GMT

Thanks for your help. That all i need to do that.