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📄 common_dimension_group_codes_al_u05_c.htm

📁 AutoCAD中DXF格式文件的说明,html格式
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<title>Common Dimension Group Codes  [ACG]</title>
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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><a href="dimension_al_u05_c.htm"><img src=images/bk_space.gif border=0> <img src=images/book2.gif border=0> DIMENSION</a> 
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<font face=Arial color=#003399 size=3><b><img src=images/bk_space.gif border=0> <img src=images/bk_space.gif border=0> <img src=images/book2.gif border=0> Common Dimension Group Codes
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<p><font face="MS Sans Serif,Arial" size=2>The following group codes apply to all dimension entity types.
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<font face=Arial size=2><i>Common dimension 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 (AcDbDimension) </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>Name of the block that contains the entities that make up the dimension picture</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>Definition 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 definition point (in WCS) </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>Middle point of dimension text. (in OCS).<br>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 middle point of dimension text. (in OCS)</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>Dimension type. <br>Values 0 - 6 are integer values which represent the dimension type. Values 32, 64, and 128 are bit values, which are added to the integer values (value 32 is always set in R13 and later releases).<br>0 = Rotated, horizontal, or vertical; 1 = Aligned<br>2 = Angular; 3 = Diameter; 4 = Radius; <br>5 = Angular 3 point; 6 = Ordinate<br>32 = Indicates that the block reference (group code 2) is referenced by this dimension only.<br>64 = Ordinate type. This is a bit value (bit 7) used only with integer value 6. If set, ordinate is X-type; if not set, ordinate is Y-type. <br>128 = This is a bit value (bit 8) added to the other group 70 values if the dimension text has been positioned at a user-defined location rather than at the default location.</font></p></td></TR>
<TR VALIGN=TOP><TD bgcolor=#F9F6ED><p><font face="MS Sans Serif,Arial" size=2>1</font></p></td>
<TD bgcolor=#F9F6ED><p><font face="MS Sans Serif,Arial" size=2>Dimension text explicitly entered by the user. Optional; default is the measurement. If null or "&lt;&gt;", the dimension measurement is drawn as the text, if " " (one blank space), the text is suppressed. Anything else is drawn as the text.</font></p></td></TR>
<TR VALIGN=TOP><TD bgcolor=#F9F6ED><p><font face="MS Sans Serif,Arial" size=2>53</font></p></td>
<TD bgcolor=#F9F6ED><p><font face="MS Sans Serif,Arial" size=2>The optional group code 53 is the rotation angle of the dimension text away from its default orientation (the direction of the dimension line).</font></p></td></TR>
<TR VALIGN=TOP><TD bgcolor=#F9F6ED><p><font face="MS Sans Serif,Arial" size=2>51</font></p></td>
<TD bgcolor=#F9F6ED><p><font face="MS Sans Serif,Arial" size=2>All dimension types have an optional 51 group code, which indicates the horizontal direction for the dimension entity. It determines the orientation of dimension text and lines for horizontal, vertical, and rotated linear dimensions. <br>This group value is the negative of the angle between the OCS <FONT FACE=ARIAL><I>X</I></FONT> axis and the UCS <FONT FACE=ARIAL><I>X</I></FONT> axis. It is always in the <FONT FACE=ARIAL><I>XY</I></FONT> plane of the OCS.</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>3</font></p></td>
<TD bgcolor=#F9F6ED><p><font face="MS Sans Serif,Arial" size=2>Dimension style name</font></p></td></TR>
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<p><font face="MS Sans Serif,Arial" size=2>Xdata belonging to the application ID <tt>"ACAD"</tt> may follow a dimension entity. This describes any dimension overrides that have been applied to this entity. See "Dimension Style Overrides." 
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<p><font face="MS Sans Serif,Arial" size=2>For all dimension types, the following group codes represent 3D WCS points: (10, 20, 30), (13, 23, 33), (14, 24, 34), and (15, 25, 35). For all dimension types, the following group codes represent 3D OCS points: (11, 21, 31), (12, 22, 32), and (16, 26, 36).
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