topic Re: Changing an entities type in ObjectARX Forum

Changing an entities type

Anonymous — Mon, 01 Oct 2012 12:47:55 GMT

Hi all,

I was wondering how to change an entity's type (DXF group code 2) using ObjectARX. I have been able to extract the currenty entity type AcDbEntGet. I have been able to change other properties of the entity using the AcDbEntMod function, however, it does not appear to allow me to change the type.

Is anyone able to advise me on how I can do this? I am currently looking at AcDbBlockTableRecord to see if there is someway to do it using this.

Cheers,

James!

Re: Changing an entities type

Anonymous — Mon, 01 Oct 2012 13:23:04 GMT

Not sure to understand correctly since I'm not extremely confortable with dxf codes.

Maybe this can help:

Changing an entity type in object arx is not possible by simply changing a property (you can't ask a line to become an arc for instance), this requires erasing the source entity and creating a new one of the type you want (erase the line, create a new arc).

In my mind, the dxf entity type is a read-only property.

I hope this helps.

Re: Changing an entities type

Anonymous — Mon, 01 Oct 2012 14:12:04 GMT

Thank you, yes I have been able to erase the entity by obtaining the AcDbEntity pointer (and calling erase()). However I am having trouble creating a new custom entity in its place. The entity exists in the toolplallet so I assume its a case of using the acutBuildList command and then acdbEntMake. For example I thought this code would insert a circle -

struct resbuf *entlist,*eb;
ads_point first = {3208.2, 956.295, 0.0};
char* layer = "0";

entlist = acutBuildList(0, "CIRCLE",// Entity type
8, layer, // Layer name
10, first,
100, "AcDbCircle",
100, "AcDbEntity",
0 );

acdbEntMake(entlist);

However the Circle doesn't seem to insert. Any suggestions?

Thanks,

James

Re: Changing an entities type

owenwengerd — Mon, 01 Oct 2012 14:59:52 GMT

Please provide some information about your environment (AutoCAD version, OS), the return values from the calls to acutBuildList and acdbEntMake, and the context from which these calls take place.

Re: Changing an entities type

Alexander.Rivilis — Mon, 01 Oct 2012 18:55:32 GMT

@Anonymous wrote:
...I was wondering how to change an entity's type (DXF group code 2) using ObjectARX...

First of all entity's type DXF group is 0 (zero)!

DXF group 2 is the name of block (if entity's type is "INSERT")

Re: Changing an entities type

Anonymous — Wed, 03 Oct 2012 02:44:44 GMT

to get circle you need at least these DXF
0 - CIRCLE
10 - Center point

40 - Radius << you missing this