当选择一条直线进行编辑时，: p" D$ I- v1 n, _8 N# U( `
线上的所有对象都会被高亮。/ P& v# K- r' n7 e" \
怎么知道系统是否推断出，打算选择的对象+ j, L, q* y" |2 h/ k$ U* w
(整条线，线的端点，线的中点)？
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. Q$ _. Q+ G% F9 I: E# PA、从状态行中读取
! I% ]+ u7 P" k( R- {- ?B、屏幕上将显示一条信息# U* {: h. A6 l) _* T" g4 T
C、一个选择对话框将被打开
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1 I' A) e3 E8 M1 H9 w5 K* jWhen selecting a line for editing, ! b1 o! b8 ]$ ~
the entire line and all three control points will highlight when any part of the line is in the selection ball,
' `( b9 k2 B% }. @" \the Status Line will tell you whether the system has detected a line, line midpoint, or line endpoint.
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3 u2 j3 ?0 W& j) T+ m4 c E答案" I" V+ q2 R! P* u6 k, `1 j1 `7 z
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