天天课堂 发表于 2009-8-14 09:28:00

用OFFSET命令画平行线的方法

<p>打开文件“1-13.dwg”，用OFFSET、EXTEND及TRIM命令将图1-27中的左图修改为右图。这个练习的目的是使读者掌握用OFFSET命令画平行线的方法。<br/><img width="422" height="207" id="img_0.9100254733616981" alt="" src="http://www.ttketang.com/home/attachment/200908/14/113_1250211511bSsU.jpg" complete="complete"/><br/>1-27画平行线<br/>操作范例——用OFFSET命令画平行线<br/>1.&nbsp; &nbsp; &nbsp; &nbsp; 画平行线C、D，如图1-28左图所示。<br/>命令: _offset<br/>指定偏移距离或 [通过(T)/删除(E)/图层(L)] &lt;10.0000&gt;: 70&nbsp; &nbsp; &nbsp; &nbsp; <br/>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; //输入平移距离<br/>选择要偏移的对象，或 [退出(E)/放弃(U)] &lt;退出&gt;:&nbsp; &nbsp; &nbsp; &nbsp; //选择直线A<br/>指定要偏移的那一侧上的点，或 [退出(E)/多个(M)/放弃(U)] &lt;退出&gt;:&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; //在直线A的右边单击一点<br/>选择要偏移的对象，或 [退出(E)/放弃(U)] &lt;退出&gt;:&nbsp; &nbsp; &nbsp; &nbsp; //按Enter键结束<br/>命令:OFFSET&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; //重复命令<br/>指定偏移距离或 &lt;70.0000&gt;: 59&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; //输入平移距离<br/>选择要偏移的对象，或 &lt;退出&gt;:&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; //选择直线B<br/>指定要偏移的那一侧上的点:&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; //在直线B的上边单击一点<br/>选择要偏移的对象，或 &lt;退出&gt;:&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; //按Enter键结束<br/>再用EXTEND命令延伸直线A、B、C、D，结果如图1-28右图所示。<br/>提示：用OFFSET命令偏移圆时，将创建同心圆。<br/><img width="423" height="153" id="img_0.10296961194209997" alt="" src="http://www.ttketang.com/home/attachment/200908/14/113_1250211503BKz9.jpg" complete="complete"/><br/>1-28画平行线C、D<br/>2.&nbsp; &nbsp; &nbsp; &nbsp; 画平行线E、F、G、H等，如图1-29左图所示。<br/>命令: _offset<br/>指定偏移距离或&lt;70.0000&gt;: 30&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; //输入平移距离<br/>选择要偏移的对象，或 &lt;退出&gt;:&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; //选择直线A<br/>指定要偏移的那一侧上的点:&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; //在直线A的右边单击一点<br/>选择要偏移的对象，或 &lt;退出&gt;:&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; //按Enter键结束<br/>再绘制以下平行线：<br/>向右平移直线A至F，平移距离为45。<br/>向上平移直线B至G，平移距离为11。<br/>向上平移直线B至H，平移距离为27。<br/>向上平移直线B至I，平移距离为43。<br/>修剪多余线条，结果如图1-29右图所示。<br/><img width="405" height="175" id="img_0.41419604130112686" alt="" src="http://www.ttketang.com/home/attachment/200908/14/113_12502115055V8D.jpg" complete="complete"/><br/>1-29画平行线E、F等<br/>3.&nbsp; &nbsp; &nbsp; &nbsp; 画平行线L、M、N等，如图1-30左图所示。<br/>命令: _offset<br/>指定偏移距离或&lt;30.0000&gt;: 6&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; //输入平移距离<br/>选择要偏移的对象，或 &lt;退出&gt;:&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; //选择直线J<br/>指定要偏移的那一侧上的点:&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; //在直线J的下边单击一点<br/>选择要偏移的对象，或 &lt;退出&gt;:&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; //按Enter键结束<br/>再绘制以下平行线：<br/>向下平移直线J至M，平移距离为16。<br/>向上平移直线J至N，平移距离为26。<br/>向上平移直线J至O，平移距离为36。<br/>向左平移直线K至P，平移距离为5。<br/>向左平移直线K至Q，平移距离为20。<br/>修剪多余线条，结果如图1-30右图所示。<br/><img width="411" height="166" id="img_0.21135133951661228" alt="" src="http://www.ttketang.com/home/attachment/200908/14/113_1250211505Tp2e.jpg" complete="complete"/><br/>1-30画平行线L、M等<br/>4.&nbsp; &nbsp; &nbsp; &nbsp; 画平行线T、U、V、W，如图1-31左图所示。<br/>命令: _offset<br/>指定偏移距离或&lt;30.0000&gt;: 5&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; //输入平移距离<br/>选择要偏移的对象，或 &lt;退出&gt;:&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; //选择直线R<br/>指定要偏移的那一侧上的点:&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; //在直线R的右边单击一点<br/>选择要偏移的对象，或 &lt;退出&gt;:&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; //按Enter键结束<br/>再绘制以下平行线：<br/>向右平移直线R至U，平移距离为33。<br/>向下平移直线S至V，平移距离为7。<br/>向下平移直线S至W，平移距离为18。<br/>修剪多余线条，结果如图1-31右图所示。<br/><img width="362" height="145" id="img_0.8209103475444641" alt="" src="http://www.ttketang.com/home/attachment/200908/14/113_1250211506Q522.jpg" complete="complete"/><br/>1-31画平行线U、V等</p><p>本贴转载于<a href="http://www.ttketang.com/">http://www.ttketang.com/</a>，更多精彩在那里等着你</p>
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