天天课堂 发表于 2009-8-14 09:21:00

打断线条及调整线条长度的方法

<table cellspacing="0" cellpadding="0"><tbody><tr><td class="t_msgfont" id="postmessage_421"><p>打开文件“1-11.dwg”，用BREAK、LENGTHEN及ERASE命令将图1-22中的左图修改为右图。这个练习的目的是使读者掌握打断线条及调整线条长度的方法。<br/><img width="357" height="182" alt="" src="http://www.ttketang.com/home/attachment/200908/14/113_1250211500Ql3N.jpg" complete="complete"/><br/>1-22打断及改变线条长度<br/>操作范例——打断线条及调整线条长度<br/>1.&nbsp; &nbsp; &nbsp; &nbsp; 用BREAK命令打断线条，如图1-23右图所示。<br/>命令: _break 选择对象:&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; //在A点处选择对象，如图1-23左图所示<br/>指定第二个打断点 或 [第一点(F)]:&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; //在B点处选择对象<br/>命令:&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/>BREAK 选择对象:&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; //在C点处选择对象<br/>指定第二个打断点 或 [第一点(F)]:&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; //在D点处选择对象<br/>命令:&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/>BREAK 选择对象:&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; //选择线段G<br/>指定第二个打断点 或 [第一点(F)]: f&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; //使用选项“第一点(F)”<br/>指定第一个打断点: int于&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; //捕捉交点E<br/>指定第二个打断点: @&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; //在同一点打断对象<br/>命令:&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/>BREAK 选择对象:&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; //选择线段H<br/>指定第二个打断点 或 [第一点(F)]: f&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; //使用选项“第一点(F)”<br/>指定第一个打断点: int于&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; //捕捉交点F<br/>指定第二个打断点: @&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; //在同一点打断对象<br/>删除多余线条，结果如图1-23右图所示。<br/>提示：在圆上选择两个打断点后，AutoCAD以第一打断点为起点沿逆时针方向将两个打断点间的那部分圆弧删除。<br/><img width="391" height="205" alt="" src="http://www.ttketang.com/home/attachment/200908/14/113_1250211497JSu4.jpg" complete="complete"/><br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<br/>1-23打断对象<br/>2.&nbsp; &nbsp; &nbsp; &nbsp; 用LENGTHEN命令调整M、N等线段的长度，如图1-24右图所示。<br/>命令: lengthen<br/>选择对象或 [增量(DE)/百分数(P)/全部(T)/动态(DY)]: dy<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; //使用“动态(DY)”选项<br/>选择要修改的对象或 [放弃(U)]:&nbsp;&nbsp;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; //在线段M的左端点处选中对象，如图1-24左 图所示<br/>指定新端点:&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; //调整左端点的位置<br/>选择要修改的对象或 [放弃(U)]:<br/>指定新端点:&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; //继续修改其他线段的长度<br/>结果如图1-24右图所示。<br/><img width="385" height="191" alt="" src="http://www.ttketang.com/home/attachment/200908/14/113_1250211498i2Kx.jpg" complete="complete"/><br/>1-24调整线条的长度<br/>3.&nbsp; &nbsp; &nbsp; &nbsp; 将线段Q、R等修改到中心线层上；再将线段O、P等修改到虚线层上，结果如图1-25所示。<br/><img width="176" height="202" alt="" src="http://www.ttketang.com/home/attachment/200908/14/113_1250211499xe2Z.jpg" complete="complete"/><br/>1-25修改对象所在的图层</p><p>本贴转载于<a href="http://www.ttketang.com/">http://www.ttketang.com/</a>，那是个学习cad和ps的很好的网站</p></td></tr></tbody></table>

红色32 发表于 2009-10-7 08:16:00

这么古老而土的方法也来发。
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