天天课堂 发表于 2009-8-9 15:31:00

cad中如何建立追踪参考点定位对象

建立追踪参考点定位对象<br/>在AutoCAD提示输入点时，如果输入“TT”选项，则说明要创建临时的追踪参考点，参考点的位置可通过输入坐标、对象捕捉或自动追踪的方法确定。当建立多个参考点后，就能利用过参考点的辅助线准确定位图形元素。<br/>下面将图1-1中的左图修改为右图，这个练习演示了利用临时追踪参考点定位图元的方法。<br/><img width="255" height="122" alt="" src="http://www.ttketang.com/home/attachment/200908/9/113_1249801493l3LD.jpg" complete="complete"/><br/>图1-1&nbsp; &nbsp;利用临时追踪参考点定位图元<br/>命令: _circle 指定圆的圆心或 [三点(3P)/两点(2P)/相切、相切、半径(T)]: tt<br/>&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; //建立临时追踪参考点B<br/>指定临时对象追踪点: 20&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; //从A点开始向右追踪并输入追踪距离<br/>指定圆的圆心或 [三点(3P)/两点(2P)/相切、相切、半径(T)]: tt<br/>&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; //建立临时追踪参考点C<br/>指定临时对象追踪点: 30&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; //从A点开始向上追踪并输入追踪距离<br/>指定圆的圆心或 [三点(3P)/两点(2P)/相切、相切、半径(T)]:<br/>&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; //利用过B和C点的追踪辅助线确定圆心<br/>指定圆的半径或 [直径(D)] &lt;5.8459&gt;: 6&nbsp; &nbsp; &nbsp; &nbsp; //输入圆半径<br/>结果如图1-1右图所示。本贴转载于<a href="http://www.ttketang.com/bbs/viewthread.php?tid=86&amp;extra">http://www.ttketang.com/bbs/viewthread.php?tid=86&amp;extra</a>=大家也可以去看一下，那里很多教程的

tls9258 发表于 2009-8-10 10:25:00

<p>麻烦重新编辑一下我看不懂@@@</p>
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