【转帖】arrow definition of leader in dxf file
 

arrow definition of leader in dxf file ?
arrow definition of leader in dxf file ?
bonjour,
i see that arrow definition of leader in dxf file is an acad def :
1001
acad
1000
dstyle
1002
{
...
}
how can i know the definition of the arrow to be able to draw it only by reading the dxf ?
thanks
eric
leader arrow block is specified by ldrblk variable (gc 341) in dimension style of leader. leader entity may have overrides of dimension style variables. they are stored as xdata in your example.
ldrblk points to block table record defining arrow geometry.
sergey slezkin
thank you sergey for your response but i don't find the ldrblk variable in the dxf file.
i read the dxf file with my own function.
i use dwgdirect only to translate dwg to dxf and after i read the dxf file.
c++ is too complicated for me...
eric
ldrblk is stored in dimstyle under 341 group code:
0
dimstyle
....
341
e7 // block table record handle
...
or in leader entity overrides:
0
leader
...
1001
acad
1000
dstyle
1002
{
...
1070
341 // group code for ldrblk override
1005
e7 // block table record handle
...
1002
}
sergey slezkin
sergey,
i have a small example with only 2 leaders :
for one i have :
1070
341
1005
33
and for the other :
1070
341
1005
0
but in dimstyle i don't have
341
33
or
341
0
in leader def. between { and } i have several codes 1070.
thanks
eric
leader entity can have extended data (xdata) with dimension style overrides and can have no.
if where is no an override value from dimension style is used.
overrides in xdata have the following form:
1070
<gc number>
1***
<value>
gc number is dxf group code used to store a variable in dimension style dxf representation. for example 341 - dimldrblk, 40 - dimscale, 41 - dimasz, etc.
1*** - xdata group code (>1000) suitable for data type of variable: 1005 for handle, 1040 for double value, 1070 for int16 value.
sergey slezkin