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📄 polyline_al_u05_c.htm

📁 AutoCAD中DXF格式文件的说明,html格式
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<title>POLYLINE  [ACG]</title>
<meta name=KEYWORDS content="DXF group codes,  polyline entity; polyline entity group codes">
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<font face=Arial color=#003399 size=3><b> <a href="dxf_group_codes.htm">DXF Group Codes</a>
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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> POLYLINE
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<p><font face="MS Sans Serif,Arial" size=2>The following group codes apply to polyline entities.
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<font face=Arial size=2><i>Polyline group codes
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<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 (AcDb2dPolyline or AcDb3dPolyline) </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>DXF: always 0<br>APP: a "dummy" point; the <FONT FACE=ARIAL><I>X</I></FONT> and <FONT FACE=ARIAL><I>Y</I></FONT> values are always 0, and the <FONT FACE=ARIAL><I>Z</I></FONT> value is the polyline's elevation (in OCS when 2D, WCS when 3D)</font></p></td></TR>
<TR VALIGN=TOP><TD bgcolor=#F9F6ED><p><font face="MS Sans Serif,Arial" size=2>20</font></p></td>
<TD bgcolor=#F9F6ED><p><font face="MS Sans Serif,Arial" size=2>DXF: always 0</font></p></td></TR>
<TR VALIGN=TOP><TD bgcolor=#F9F6ED><p><font face="MS Sans Serif,Arial" size=2>30</font></p></td>
<TD bgcolor=#F9F6ED><p><font face="MS Sans Serif,Arial" size=2>DXF: polyline's elevation (in OCS when 2D, WCS when 3D)</font></p></td></TR>
<TR VALIGN=TOP><TD bgcolor=#F9F6ED><p><font face="MS Sans Serif,Arial" size=2>39</font></p></td>
<TD bgcolor=#F9F6ED><p><font face="MS Sans Serif,Arial" size=2>Thickness (optional; default = 0)</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>Polyline flag (bit-coded); default is 0:<br>1 = This is a closed polyline (or a polygon mesh closed in the M direction).<br>2 = Curve-fit vertices have been added.<br>4 = Spline-fit vertices have been added.<br>8 = This is a 3D polyline.<br>16 = This is a 3D polygon mesh.<br>32 = The polygon mesh is closed in the N direction.<br>64 = The polyline is a polyface mesh.<br>128 = The linetype pattern is generated continuously around the vertices of this polyline.</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>Default starting width (optional; default = 0)</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>Default ending width (optional; default = 0)</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>Polygon mesh M vertex count (optional; default = 0)</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>Polygon mesh N vertex count (optional; default = 0)</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>Smooth surface M density (optional; default = 0)</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>Smooth surface N density (optional; default = 0)</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>Curves and smooth surface type (optional; default = 0); integer codes, not bit-coded:<br>0 = No smooth surface fitted<br>5 = Quadratic B-spline surface<br>6 = Cubic B-spline surface<br>8 = Bezier surface</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>
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<p><font face="MS Sans Serif,Arial" size=2>Xdata with the <tt>"AUTOCAD_POSTSCRIPT_FIGURE"</tt> application ID may follow. This contains information related to PostScript images and PostScript fill information.
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<font face="MS Sans Serif,Tahoma,Arial" size=2>Topics in this section:
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<font face="MS Sans Serif,Tahoma,Arial" size=2><UL type=square><LI> <a href="polyface_meshes_al_u05_c.htm">Polyface Meshes</a>
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