topic Re: Custom Entity, help me in ObjectARX Forum

Custom Entity, help me

Anonymous — Sun, 05 Jun 2011 15:58:00 GMT

Sorry my english is not best!

I have a question. I want to generate a my custom entity class in ObjectDBX, which inherit AcDb Entity, either polyline or spline. That is, in the Autocad, with my Custom Entity class i can daw my custom polyline or spline. Please tell me how to do that?

Re: Custom Entity, help me

Balaji_Ram — Mon, 06 Jun 2011 04:00:19 GMT

Hello,

You may install ObjectARX Wizard and then use it to create this custom entity.

I have attached a screenshot outlining the steps to get you started.

Cheers,

Balaji

Developer Technical Services

Re: Custom Entity, help me

Anonymous — Wed, 08 Jun 2011 02:43:49 GMT

thank you so much!!! I'm sorry, How to my custom entity class inherits both Polyline, Spline and Text

Re: Custom Entity, help me

artc2 — Wed, 08 Jun 2011 16:40:01 GMT

Custom objects/entities cannot inherit from multiple other classes in the ARX runtime tree. The reason is that the ARX runtime tree implementation cannot deal with multiple inheritance within the tree.

So, your custom entity can derive from AcDbPolyline, AcDbSpline, or AcDbText, but not all three (or even two) at the same time.

If you really need to the data and/or functionality of all three, then perhaps you could embed one of each of those three entity types within your custom entity and then implement methods on your custom entity that call through to the embedded entities' methods.

Embedding entities does require some special handling for dxf filing. There is a section about this in the ObjectARX Developer's Guide.

Re: Custom Entity, help me

Anonymous — Thu, 09 Jun 2011 03:51:18 GMT

Thank you for all reply so much! I'm a VietNamess, I'm learning ObjectARX, I hope to receive more help from you. Happy to be acquainted with all of you, my yahoo nickname's mcx_bkhn

Re: Custom Entity, help me

Balaji_Ram — Thu, 09 Jun 2011 07:21:39 GMT

Hi !

Happy to know you too

Good luck with your ObjectARX learning and feel free post your doubts in this forum.