天天课堂 发表于 2009-8-11 10:15:00

教你如何绘制与3个图形对象相切的圆弧

<div class="defaultpost"><div class="postmessage firstpost"><div id="threadtitle"><h1></h1></div><div class="t_msgfontfix"><table cellspacing="0" cellpadding="0"><tbody><tr><td class="t_msgfont" id="postmessage_366">绘制与3个图形对象相切的圆弧<br/>&nbsp; &nbsp; &nbsp; &nbsp; 如图2-1所示为与3个图形对象相切的过渡圆弧。可先用CIRCLE命令“三点(3P)”选项画与3个已知对象相切的圆，再用TRIM命令剪掉多余圆弧就形成了所需的过渡圆弧。下面用CIRCLE和TRIM命令将图2-3中的左图修改为右图。<br/><img width="247" height="166" alt="" src="http://www.ttketang.com/home/attachment/200908/11/113_1249951780Ccca.jpg" complete="complete"/><br/><br/>命令: _circle 指定圆的圆心或 [三点(3P)/两点(2P)/相切、相切、半径(T)]: 3p<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; &nbsp; &nbsp; &nbsp; &nbsp; //使用选项“三点(3P)”<br/>指定圆上的第一个点: tan到&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; //捕捉切点A<br/>指定圆上的第二个点: tan到&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; //捕捉切点B<br/>指定圆上的第三个点: tan到&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; //捕捉切点C<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; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; //重复命令<br/>CIRCLE 指定圆的圆心或 [三点(3P)/两点(2P)/相切、相切、半径(T)]: 3p<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; &nbsp; &nbsp; &nbsp; &nbsp; //使用选项“三点(3P)”<br/>指定圆上的第一个点: tan到&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; //捕捉切点D<br/>指定圆上的第二个点: tan到&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; //捕捉切点E<br/>指定圆上的第三个点: tan到&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; //捕捉切点F<br/>再修剪多余圆弧，结果如图2-1右图所示。</td></tr></tbody></table></div></div></div>本贴是我从<a href="http://www.ttketang.com/">http://www.ttketang.com/</a>学来的，想学cad或ps的一定不能错过的网站哦

liguanjun 发表于 2009-10-16 16:01:00

<p>好贴</p><p>顶</p>
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