MULTILEADER Internals

The MULTILEADER leader is a very complex entity and has also some weird and unique properties.

  1. MULTILEADER has the alias name MLEADER which is accepted by any reliable CAD application, but all of them create the entity as MULTILEADER

  2. uses raw-color values to define colors

  3. creates a complex context data structures beyond simple tags inside the subclass AcDbMLeader

See also

Example for ezdxf.entities.MLeaderContext created by BricsCAD:

300 <str> CONTEXT_DATA{
40 <float> 1.0    <<< content scale
10 <point> (x, y, z)      <<< content base point
41 <float> 4.0    <<< text height
140 <float> 4.0   <<< arrowhead size
145 <float> 2.0   <<< landing gap size
174 <int> 1       <<< doc missing
175 <int> 1       <<< doc missing
176 <int> 0       <<< doc missing
177 <int> 0       <<< doc missing
290 <int> 1       <<< has_mtext_content
<<< START MText Content tags:
304 <str> MTEXT content string
11 <point> (0.0, 0.0, 1.0)    <<< extrusion vector
340 <hex> #A0                 <<< text style as handle
12 <point> (x, y, z)          <<< text location
13 <point> (1.0, 0.0, 0.0)    <<< text direction
42 <float> 0.0        <<< text rotation
43 <float> 0.0        <<< text width
44 <float> 0.0        <<< text height
45 <float> 1.0        <<< text line space factor
170 <int> 1           <<< text line space style
90 <int> -1056964608  <<< text color (raw value)
171 <int> 1           <<< text attachment
172 <int> 1           <<< text flow direction
91 <int> -939524096   <<< text background color (raw value)
141 <float> 1.5       <<< text background scale factor
92 <int> 0            <<< text background transparency
291 <int> 0           <<< has_text_bg_color
292 <int> 0           <<< has_text_bg_fill
173 <int> 0           <<< text column type
293 <int> 0           <<< use text auto height
142 <float> 0.0       <<< text column width
143 <float> 0.0       <<< text column gutter width
294 <int> 0           <<< text column flow reversed
144 <float> missing   <<< text column height (optional?)
295 <int> 0           <<< text use word break
<<< END MText Content tags:
296 <int> 0       <<< has_block_content
<<< START Block content tags
<<< END Block content tags
110 <point> (0.0, 0.0, 0.0)       <<< MLEADER plane origin point
111 <point> (1.0, 0.0, 0.0)       <<< MLEADER plane x-axis direction
112 <point> (0.0, 1.0, 0.0)       <<< MLEADER plane y-axis direction
297 <int> 0                       <<< MLEADER normal reversed
302 <str> LEADER{
...
303 <str> }
302 <str> LEADER{
...
303 <str> }
272 <int> 9       <<< doc missing
273 <int> 9       <<< doc missing
301 <str> }
<<< BricsCAD example for block content:
300 <str> CONTEXT_DATA{
40 <float> 1.0
10 <point> (x, y, z)
41 <float> 4.0
140 <float> 4.0
145 <float> 2.0
174 <int> 1
175 <int> 1
176 <int> 0
177 <int> 0
290 <int> 0       <<< has_mtext_content
296 <int> 1       <<< has_block_content
<<< START Block content tags
341 <hex> #94                 <<< dxf.block_record_handle
14 <point> (0.0, 0.0, 1.0)    <<< Block extrusion vector
15 <point> (x, y, z)          <<< Block location
16 <point> (1.0, 1.0, 1.0)    <<< Block scale vector, the x-, y- and z-axis scaling factors
46 <float> 0.0                <<< Block rotation in radians!
93 <int> -1056964608          <<< Block color (raw value)
47 <float> 1.0                <<< start of transformation matrix (16x47)
47 <float> 0.0
47 <float> 0.0
47 <float> 18.427396871473
47 <float> 0.0
47 <float> 1.0
47 <float> 0.0
47 <float> 0.702618780008
47 <float> 0.0
47 <float> 0.0
47 <float> 1.0
47 <float> 0.0
47 <float> 0.0
47 <float> 0.0
47 <float> 0.0
47 <float> 1.0                <<< end of transformation matrix
<<< END Block content tags
110 <point> (0.0, 0.0, 0.0)       <<< MLEADER plane origin point
111 <point> (1.0, 0.0, 0.0)       <<< MLEADER plane x-axis direction
112 <point> (0.0, 1.0, 0.0)       <<< MLEADER plane y-axis direction
297 <int> 0                       <<< MLEADER normal reversed
302 <str> LEADER{
...
303 <str> }
272 <int> 9
273 <int> 9
301 <str> }
<<< Attribute content and other redundant block data is stored in the AcDbMLeader
<<< subclass:
100 <ctrl> AcDbMLeader
270 <int> 2                   <<< dxf.version
300 <str> CONTEXT_DATA{       <<< start context data
...
301 <str> }                   <<< end context data
340 <hex> #6D                 <<< dxf.style_handle
90 <int> 6816768              <<< dxf.property_override_flags
...                           <<< property overrides
292 <int> 0                   <<< dxf.has_frame_text
<<< mostly redundant block data:
344 <hex> #94                 <<< dxf.block_record_handle
93 <int> -1056964608          <<< dxf.block_color (raw value)
10 <point> (1.0, 1.0, 1.0)    <<< dxf.block_scale_vector
43 <float> 0.0                <<< dxf.block_rotation in radians!
176 <int> 0                   <<< dxf.block_connection_type
293 <int> 0                   <<< dxf.is_annotative
<<< REPEAT: (optional)
94 <int>                      <<< arrow head index?
345 <hex>                     <<< arrow head handle
<<< REPEAT: (optional)
330 <hex> #A3                 <<< ATTDEF handle
177 <int> 1                   <<< ATTDEF index
44 <float> 0.0                <<< ATTDEF width
302 <str> B                   <<< ATTDEF text (reused group code)
...  common group codes 294, 178, 179, ...