AutoCAD dxf format for a hidden line, can someone post a R12 dxf?

[Zrob]

Hi Guys!

Here is the basic format for a typical line, but what do I need to add or change to make a hidden line? Do I need to add $variables and line type table data?

CONTINUOUS
0
LINE
8
111
10
82.230375
20
27.375
30
0
11
0
21
27.375
31
0
62
240
6 

[Tommy]

I saved this dxf from acad 2007 and I think the counter should not be included but can't remeber that far back. I know in release 10 the counter was not required, I thought the counter didn't show up till 14.

0
LINE
  5   <-- this is the header for a counter in hex
CD   <-- hex value of the entity
  8   <-- layer
0     <-- layer name
  6      <--- line type header
HIDDEN  <-- line type
 10        <-- X start
49.5
 20        <-- Y start
26.375
 30        <-- Z start
0.0
 11        <-- X end
25.3125
 21        <-- Y end
24.75
 31        <-- Z end
0.0 

[Zrob]

Hi Tommy,

Good to here from you again!

Here is a complete striped down dxf file that should open up in most cad system or viewers. I am outputting this from a JavaScript program so I am trying to keep the format really simple.

To use hidden, don't I need a value for size of the dash? Also do you think I am going to need table info to support line types?

This format is a little different than yours, but I am still trying to add hidden lines then I will try and add points too, but its all just following a simple rectangle part in the end.

Here is a good link:
http://local.wasp.uwa.edu.au/~pbourke/dataformats/dxf/dxf10.html

0
SECTION
2
ENTITIES
0
LINE
8
111 = layer Name
10
0
20
0
30
0
11
12.5
21
0
31
0
62
18 = color of line
6
STANDARD
999
txt shx
0
ENDSEC
0
EOF 

[Tommy]

Yes you would need a table of linetypes. Ltscale controls the length of the dashes. A color of 256 will be "ByLayer". I had "assumed" that the header info was already there I didn't realize that you were importing a line at a time.

[Zrob]

Ok, I will have to give that a try then, it would be nice to add hidden lines when needed.