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Re: about DXF format [message #54469 is a reply to message #54401]

Wed, 13 June 2007 19:07

airy.jiang
Messages: 37
Registered: May 2007

Member

On 6 13 , 7 45 , Andrew Cool <andrew.c...@dsto.defence.gov.au>
wrote:
> On Jun 12, 7:36 pm, airy.ji...@gmail.com wrote:
>
>
>
>
>
>> Hi,everybody.
>> Recently,i'm troubled in with loading DXF files into my program.
>> When I loading some simple DXF files ,it can be displayed very well.I
>> used IDLffDXF object,and I just checked whether the file has the
>> IDL_DXF_POLYGON entity acoording the GetContents and GetEntity
>> methods.Then load the vertex data and connectivities into new
>> IDLgrPolygon objects.But once I load some complex DXF files,the
>> trouble has coming:first,the position of some IDLgrPolygons are not
>> precision.Second,we know,sometimes,it just need one IDLgrPolygon
>> object to display a polygon which be composed by a lot of
>> triangles.But when I loading some DXF files, the GetEntity method
>> shows a very bad result.It produed many many IDLgrPolygons,so much as
>> decomposed some polygon entitys.That makes my program became very
>> slow ,and need to wait a long time for it .How could I promote my
>> loading speed?Is there any better way to avoid making too many
>> IDLgrPolygons through GetEntity method?
>> I don't know whether I made my question clear,please parden me for my
>> poor english^_*,I'll pracitse more.
>> Thanks.
>
> How about trying to load your DXF file in REVOLUTION IDL, to see
> whether the
> expert's program can handle your file?
>
> Download REVOLUTION IDL from : -
>
> http://www.ittvis.com/codebank/search.asp?FID=473
>
> Cheers,
>
> Andrew- -
>
> -

Thanks for your suggestion,Andrew Cool.
I've used that program read that DXF file,the result is expert's
program has made the same mistakes.And it made whole a file into one
polygon,that's not the answer I want.The different entities should be
detached.One entity correspond one polygon,that is the right
result,and that relationship should be wrote in the DXF file.We have
no need to do it by ourselves,we just need to read it from the
file,that's all.

Hope more people could join here to discuss this subject.Specailly
about IDL_DXF_INSERT,IDL_DXF_BLOCK,IDL_DXF_LAYER these structures,is
there anybody know their's use?

thanks.

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[Message index]

		about DXF format By: airy.jiang on Tue, 12 June 2007 03:36
		Re: about DXF format By: airy.jiang on Sat, 16 June 2007 19:20
		Re: about DXF format By: JMZawodny on Mon, 18 June 2007 05:23
		Re: about DXF format By: airy.jiang on Wed, 13 June 2007 19:07
		Re: about DXF format By: airy.jiang on Wed, 13 June 2007 18:51
		Re: about DXF format By: Andrew Cool on Tue, 12 June 2007 16:45
		Re: about DXF format By: Rick Towler on Tue, 12 June 2007 16:24
		Re: about DXF format By: airy.jiang on Tue, 19 June 2007 08:20
		Re: about DXF format By: Vince Hradil on Mon, 18 June 2007 08:14
		Re: about DXF format By: Vince Hradil on Mon, 18 June 2007 07:55
		Re: about DXF format By: JMZawodny on Thu, 21 June 2007 06:51
		Re: about DXF format By: airy.jiang on Tue, 26 June 2007 21:12
		Re: about DXF format By: Vince Hradil on Wed, 27 June 2007 06:39
		Re: about DXF format By: Rick Towler on Thu, 21 June 2007 09:26
		Re: about DXF format By: JMZawodny on Thu, 28 June 2007 10:58
		Re: about DXF format By: Vince Hradil on Thu, 21 June 2007 07:50
		Re: about DXF format By: JMZawodny on Fri, 29 June 2007 05:30
		Re: about DXF format By: Vince Hradil on Thu, 28 June 2007 12:23
		Re: about DXF format By: JMZawodny on Thu, 28 June 2007 11:37

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