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📄 mline_al_u05_c.htm

📁 AutoCAD中DXF格式文件的说明,html格式
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<title>MLINE  [ACG]</title>
<meta name=KEYWORDS content="DXF group codes,  mline entity; mline entity group codes">
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<meta name=UPDATED content="19june98">
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<font face=Arial color=#003399 size=3><b> <a href="dxf_group_codes.htm">DXF Group Codes</a>
</b></font>
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<font face=Arial color=#003399 size=3><b><a href="entities_section_al_u05_c.htm"><img src=images/book2.gif border=0> ENTITIES Section</a> 
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<font face=Arial color=#003399 size=3><b><img src=images/bk_space.gif border=0> <img src=images/book2.gif border=0> MLINE
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<p><font face="MS Sans Serif,Arial" size=2>The following group codes apply to mline entities.
</font></p>
<font face=Arial size=2><i>Mline group codes
</i></font>
<TABLE border=0 cellpadding=2 cellspacing=4><TR VALIGN=TOP><TD bgcolor=#F9F6ED><font face="MS Sans Serif,Arial" size=2><b>Group codes</b></font></td>
<TD bgcolor=#F9F6ED><font face="MS Sans Serif,Arial" size=2><b>Description</b></font></td></TR>
<TR VALIGN=TOP><TD bgcolor=#F9F6ED><p><font face="MS Sans Serif,Arial" size=2>100</font></p></td>
<TD bgcolor=#F9F6ED><p><font face="MS Sans Serif,Arial" size=2>Subclass marker (AcDbMline) </font></p></td></TR>
<TR VALIGN=TOP><TD bgcolor=#F9F6ED><p><font face="MS Sans Serif,Arial" size=2>2</font></p></td>
<TD bgcolor=#F9F6ED><p><font face="MS Sans Serif,Arial" size=2>String of up to 32 characters. The name of the style used for this mline. An entry for this style must exist in the MLINESTYLE dictionary. <br><br>NOTE Do <font face=Arial><i>not</i></font> modify this field.</font></p></td></TR>
<TR VALIGN=TOP><TD bgcolor=#F9F6ED><p><font face="MS Sans Serif,Arial" size=2>340</font></p></td>
<TD bgcolor=#F9F6ED><p><font face="MS Sans Serif,Arial" size=2>Pointer-handle/ID of MLINESTYLE dictionary</font></p></td></TR>
<TR VALIGN=TOP><TD bgcolor=#F9F6ED><p><font face="MS Sans Serif,Arial" size=2>40</font></p></td>
<TD bgcolor=#F9F6ED><p><font face="MS Sans Serif,Arial" size=2>Scale factor.</font></p></td></TR>
<TR VALIGN=TOP><TD bgcolor=#F9F6ED><p><font face="MS Sans Serif,Arial" size=2>70</font></p></td>
<TD bgcolor=#F9F6ED><p><font face="MS Sans Serif,Arial" size=2>Justification: 0=top, 1=zero, 2=bottom</font></p></td></TR>
<TR VALIGN=TOP><TD bgcolor=#F9F6ED><p><font face="MS Sans Serif,Arial" size=2>71</font></p></td>
<TD bgcolor=#F9F6ED><p><font face="MS Sans Serif,Arial" size=2>Open/closed flag: 1=open, 3=closed</font></p></td></TR>
<TR VALIGN=TOP><TD bgcolor=#F9F6ED><p><font face="MS Sans Serif,Arial" size=2>72</font></p></td>
<TD bgcolor=#F9F6ED><p><font face="MS Sans Serif,Arial" size=2>Number of vertices</font></p></td></TR>
<TR VALIGN=TOP><TD bgcolor=#F9F6ED><p><font face="MS Sans Serif,Arial" size=2>73</font></p></td>
<TD bgcolor=#F9F6ED><p><font face="MS Sans Serif,Arial" size=2>Number of elements in MLINESTYLE definition</font></p></td></TR>
<TR VALIGN=TOP><TD bgcolor=#F9F6ED><p><font face="MS Sans Serif,Arial" size=2>10</font></p></td>
<TD bgcolor=#F9F6ED><p><font face="MS Sans Serif,Arial" size=2>Start point (in WCS). DXF: <FONT FACE=ARIAL><I>X</I></FONT> value; APP: 3D point</font></p></td></TR>
<TR VALIGN=TOP><TD bgcolor=#F9F6ED><p><font face="MS Sans Serif,Arial" size=2>20, 30</font></p></td>
<TD bgcolor=#F9F6ED><p><font face="MS Sans Serif,Arial" size=2>DXF: <FONT FACE=ARIAL><I>Y</I></FONT> and <FONT FACE=ARIAL><I>Z </I></FONT>values of start point (in WCS)</font></p></td></TR>
<TR VALIGN=TOP><TD bgcolor=#F9F6ED><p><font face="MS Sans Serif,Arial" size=2>210</font></p></td>
<TD bgcolor=#F9F6ED><p><font face="MS Sans Serif,Arial" size=2>Extrusion direction. (optional; default = 0, 0, 1). <br>DXF: <FONT FACE=ARIAL><I>X</I></FONT> value; APP: 3D vector</font></p></td></TR>
<TR VALIGN=TOP><TD bgcolor=#F9F6ED><p><font face="MS Sans Serif,Arial" size=2>220, 230</font></p></td>
<TD bgcolor=#F9F6ED><p><font face="MS Sans Serif,Arial" size=2>DXF: <FONT FACE=ARIAL><I>Y</I></FONT> and <FONT FACE=ARIAL><I>Z </I></FONT>values of extrusion direction</font></p></td></TR>
<TR VALIGN=TOP><TD bgcolor=#F9F6ED><p><font face="MS Sans Serif,Arial" size=2>11</font></p></td>
<TD bgcolor=#F9F6ED><p><font face="MS Sans Serif,Arial" size=2>Vertex coordinates (multiple entries; one entry for each vertex). DXF: <FONT FACE=ARIAL><I>X</I></FONT> value; APP: 3D point</font></p></td></TR>
<TR VALIGN=TOP><TD bgcolor=#F9F6ED><p><font face="MS Sans Serif,Arial" size=2>21, 31</font></p></td>
<TD bgcolor=#F9F6ED><p><font face="MS Sans Serif,Arial" size=2>DXF: <FONT FACE=ARIAL><I>Y</I></FONT> and <FONT FACE=ARIAL><I>Z </I></FONT>values of vertex coordinates</font></p></td></TR>
<TR VALIGN=TOP><TD bgcolor=#F9F6ED><p><font face="MS Sans Serif,Arial" size=2>12</font></p></td>
<TD bgcolor=#F9F6ED><p><font face="MS Sans Serif,Arial" size=2>Direction vector of segment starting at this vertex&nbsp;&nbsp;(multiple entries; one for each vertex).<br>DXF: <FONT FACE=ARIAL><I>X</I></FONT> value; APP: 3D vector</font></p></td></TR>
<TR VALIGN=TOP><TD bgcolor=#F9F6ED><p><font face="MS Sans Serif,Arial" size=2>22, 32</font></p></td>
<TD bgcolor=#F9F6ED><p><font face="MS Sans Serif,Arial" size=2>DXF: <FONT FACE=ARIAL><I>Y</I></FONT> and <FONT FACE=ARIAL><I>Z </I></FONT>values of direction vector of segment starting at this vertex</font></p></td></TR>
<TR VALIGN=TOP><TD bgcolor=#F9F6ED><p><font face="MS Sans Serif,Arial" size=2>13</font></p></td>
<TD bgcolor=#F9F6ED><p><font face="MS Sans Serif,Arial" size=2>Direction vector of miter at this vertex (multiple entries: one for each vertex). DXF: <FONT FACE=ARIAL><I>X</I></FONT> value; APP: 3D vector</font></p></td></TR>
<TR VALIGN=TOP><TD bgcolor=#F9F6ED><p><font face="MS Sans Serif,Arial" size=2>23, 33</font></p></td>
<TD bgcolor=#F9F6ED><p><font face="MS Sans Serif,Arial" size=2>DXF: <FONT FACE=ARIAL><I>Y</I></FONT> and <FONT FACE=ARIAL><I>Z </I></FONT>values of direction vector of miter</font></p></td></TR>
<TR VALIGN=TOP><TD bgcolor=#F9F6ED><p><font face="MS Sans Serif,Arial" size=2>74</font></p></td>
<TD bgcolor=#F9F6ED><p><font face="MS Sans Serif,Arial" size=2>Number of parameters for this element (repeats for each element in segment)</font></p></td></TR>
<TR VALIGN=TOP><TD bgcolor=#F9F6ED><p><font face="MS Sans Serif,Arial" size=2>41</font></p></td>
<TD bgcolor=#F9F6ED><p><font face="MS Sans Serif,Arial" size=2>Element parameters (repeats based on previous code 74)</font></p></td></TR>
<TR VALIGN=TOP><TD bgcolor=#F9F6ED><p><font face="MS Sans Serif,Arial" size=2>75</font></p></td>
<TD bgcolor=#F9F6ED><p><font face="MS Sans Serif,Arial" size=2>Number of area fill parameters for this element (repeats for each element in segment)</font></p></td></TR>
<TR VALIGN=TOP><TD bgcolor=#F9F6ED><p><font face="MS Sans Serif,Arial" size=2>42</font></p></td>
<TD bgcolor=#F9F6ED><p><font face="MS Sans Serif,Arial" size=2>Area fill parameters (repeats based on previous code 75)</font></p></td></TR>
</TABLE>

<p><font face="MS Sans Serif,Arial" size=2>The group code 41 parameterization is a list of real values, one real per group code 41. The list&nbsp;&nbsp;may contain zero or more items. The first group code 41 value is the distance from the segment vertex along the miter vector to the point where the line element's path intersects the miter vector. The next group code 41 value is the distance along the line element's path from the point defined by the first group 41 to the actual start of the line element. The next is the distance from the start of the line element to the first break (or cut) in the line element. The successive group code 41 values continue to list the start and stop points of the line element in this segment of the mline. Linetypes do not affect group 41 lists.
</font></p>
<p><font face="MS Sans Serif,Arial" size=2>The group code 42 parameterization is also a list of real values. Similar to the 41 parameterization, it describes the parameterization of the fill area for this mline segment. The values are interpreted identically to the 41 parameters and when taken as a whole for all line elements in the mline segment, they define the boundary of the fill area for the mline segment.
</font></p>
<p><font face="MS Sans Serif,Arial" size=2>A common example of the use of the group code 42 mechanism is when an unfilled mline crosses over a filled mline and mledit is used to cause the filled mline to appear unfilled in the crossing area. This would result in two group 42s for each line element in the affected mline segment, one for the fill stop and one for the fill start.
</font></p>
<p><font face="MS Sans Serif,Arial" size=2>The 2 group codes in mline entities and mlinestyle objects are redundant fields. These groups should <font face=Arial><i>not</i></font> be modified under any circumstances, although it is safe to read them and use their values. The correct fields to modify are as follows:
</font></p>
<font face="MS Sans Serif,Arial" size=2><b>Mline
</b></font><br>
<p><font face="MS Sans Serif,Arial" size=2><UL>The 340 group in the same object, which indicates the proper mlinestyle object.
</font></p>
<font face="MS Sans Serif,Arial" size=2><b></UL> Mlinestyle
</b></font><br>
<p><font face="MS Sans Serif,Arial" size=2><UL>The 3 group value in the mlinestyle dictionary which precedes the 350 group that has the handle or entity name of the current mlinestyle.
</font></p>
</UL> 
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