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這個(gè)真是個(gè)難題，現(xiàn)在我把下載的一個(gè)做法提供給大家，供參考
3 j! L, m0 X& o1.先用直線命令畫(huà)一直線（圖1）。過(guò)程如下：
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# w1 z# e& v+ y+ ~" ^& a1 l 命令: LINE) J7 \6 n! u5 A
指定第一點(diǎn): 0,0
8 \( z9 y5 T2 P1 T/ u 指定下一點(diǎn)或 [放棄(U)]: 'cal
+ R h$ s: A' b0 K3 b >> 表達(dá)式: +[100*100/200<-30]
! P+ R7 t; H# b$ o" g; V (43.3013 -25.0 0.0)
) N0 c+ H; y! f V% E0 ^ 指定下一點(diǎn)或 [放棄(U)]: ↙
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. U* U6 f2 T* O5 T& E' j f 2.移動(dòng)該直線，如圖2。
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3.用多段線命令畫(huà)多段線，先向-60度方向拉出適當(dāng)長(zhǎng)度，如圖3。 \' [2 I. l& F: D+ b% `) t$ l# z
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4.繼續(xù)畫(huà)多段線，完成一個(gè)直角三角形，如圖4。
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4 a4 O; G( L( A8 T/ D- k 5.用REVOLVE命令旋轉(zhuǎn)直角三角形，生成一個(gè)三維實(shí)體，如圖5。過(guò)程如下：
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命令: REVOLVE {% U7 Y/ c( X, C5 \9 u! h5 @
當(dāng)前線框密度: ISOLINES=49 ^" J3 E3 g6 }9 A
選擇對(duì)象:（選擇直角三角形）
. ~1 F' x" n/ u7 P- F7 s 選擇對(duì)象: ↙
1 w2 `: N+ y. p$ ~! t3 p 指定旋轉(zhuǎn)軸的起點(diǎn)或
7 j. C0 H7 b. k& J9 h7 ~ 定義軸依照 [對(duì)象(O)/X 軸(X)/Y 軸(Y)]:（捕捉A點(diǎn)）
$ d* ]& w8 K" l" _8 ^, j8 P- q 指定軸端點(diǎn): （捕捉B點(diǎn)）
. ^! C! v# c' C e3 a1 o4 N 指定旋轉(zhuǎn)角度 <360>:↙
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6.用SECTION命令切割三維實(shí)體，生成一個(gè)面域，如圖6。過(guò)程如下：$ W6 w+ T- o7 P: \' U: j
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命令: SECTION' ?$ A8 m/ Z8 |! f7 ~
選擇對(duì)象: (選擇上一步生成的旋轉(zhuǎn)實(shí)體)0 y* E& E. {* K. k7 |! d; ~/ c
選擇對(duì)象: ↙0 }; l. s& y5 ?* I
指定截面上的第一個(gè)點(diǎn)，依照 [對(duì)象(O)/Z 軸(Z)/視圖(V)/XY 平面(XY)/YZ 平面(YZ)/ZX 平面(ZX)/三點(diǎn)(3)] <三點(diǎn)>: yz8 c6 I: \4 e5 `, M( m/ K
指定 YZ 平面上的點(diǎn) <0,0,0>:（捕捉C點(diǎn)）. o8 h" U* `/ G! k# T5 q" X
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7.用rotate3d命令對(duì)上一步生成的面域進(jìn)行三維旋轉(zhuǎn)，如圖7。過(guò)程如下：
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+ t! o+ |% Y. g, q5 s 命令: rotate3d
+ D3 c) k0 x0 N, q, J, _ 當(dāng)前正向角度: ANGDIR=逆時(shí)針 ANGBASE=0
! `2 l j1 F1 @8 B* X+ x 選擇對(duì)象: （選擇上一步生成的面域）
# s2 C$ {$ g; t0 m: t 選擇對(duì)象: ↙
1 u- L( `3 \# V+ w$ V" Z 指定軸上的第一個(gè)點(diǎn)或定義軸依據(jù)[對(duì)象(O)/最近的(L)/視圖(V)/X 軸(X)/Y 軸(Y)/Z 軸(Z)/兩點(diǎn)(2)]: (捕捉C點(diǎn)) 指定軸上的第二點(diǎn):（捕捉D點(diǎn)）1 \2 e4 G( u. o, }' o
指定旋轉(zhuǎn)角度或 [參照(R)]: 90$ Z: g# B4 x3 f+ j
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8.先用EXPLODE命令分解旋轉(zhuǎn)后的面域，再清理圖面，刪除不需要的圖元，如圖8。
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9.移動(dòng)拋物線，如圖9。完畢！0 e- c! d% C' g& q5 D( F h
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: x3 g. U& S9 O# @http://bbs.icax.cn/register.php9 Z. B) N* `' g! {) V# F3 V
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Sub trparabola() 4 m5 V# ~- {/ @
Dim bq1, bq2, pt1, pt2 As Variant 4 n. G g* j t0 ?
Dim aa, ll, yy, a1, a2, a3, a4, aa1, pt3(0 To 2), bq4(0 To 2) As Double % m7 z5 D! c- s# u0 R% i
Dim bq3(0 To 2) As Double
' M# J4 S! Q2 F2 K( [9 d9 j+ BDim ae As Double
# m: p% j, G3 |. Z% R0 b* T7 Z7 w% ]& wDim pt33(0 To 2) As Double ! Z3 t0 n: A( m' }+ t
Dim ptarr(0 To 7) As Double ' k+ [- X& I* A# D3 S) ]2 T
Dim alt As Variant 2 l! C" f0 z/ V$ R4 b
Dim objboltb As Acad3DSolid 7 u' X' d: W; X1 G; P
Dim al As Variant - ?" [/ `7 h$ ^5 ~
Dim lens As AcadLWPolyline ! [' |5 l4 a# }/ X$ P- e& O
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'求個(gè)控制點(diǎn) % q' J7 J) ] `* m. g) o8 h
bq1 = ThisDrawing.Utility.GetPoint(, "拋物線頂點(diǎn): ")
& p, y4 w3 N2 H3 Jaa = ThisDrawing.Utility.GetReal("輸入二次項(xiàng)系數(shù)： ")
. D+ A) D$ Q6 R9 u$ a1 zll = ThisDrawing.Utility.GetDistance(, "輸入開(kāi)口弦長(zhǎng)： ") # `/ I) j' `+ R5 D0 E/ u
aa1 = 1 / aa # {( [ y. q$ u! ~
yy = aa * (ll / 2) ^ 2
$ C5 v0 b( e5 Y; y9 h' {2 t7 [4 A$ x' Ja1 = ThisDrawing.Utility.AngleToReal(-30, acDegrees) . ^0 \, U* Q2 e" O6 N- U2 g6 ~/ o
a2 = ThisDrawing.Utility.AngleToReal(30, acDegrees) ) l) k! W# q5 r/ F+ H
a3 = ThisDrawing.Utility.AngleToReal(90, acDegrees) 5 j; O N8 k% j% U$ e
a4 = ThisDrawing.Utility.AngleToReal(150, acDegrees) 8 y; v& Z( t$ {, f
bq2 = ThisDrawing.Utility.PolarPoint(bq1, a2, yy) 1 |+ k, U, s" H) N8 a+ V* D
pt1 = ThisDrawing.Utility.PolarPoint(bq1, a4, aa1) " ~, D) ?/ U( L" M% v1 L# p
pt2 = ThisDrawing.Utility.PolarPoint(bq2, a3, aa1) , d7 w' z4 v+ _1 N3 _$ Y
pt3(0) = pt2(0): pt3(1) = pt1(1): pt3(2) = pt1(2) 5 M# K- \1 t$ `* a& ?
bq3(0) = bq2(0): bq3(1) = bq2(1): bq3(2) = bq2(2) + 10 : Q7 Z- \( q- g
bq4(0) = bq2(0): bq4(1) = bq1(1): bq4(2) = bq1(2)
& n/ G, i# M' L# ppt33(0) = 10: pt33(1) = 0: pt33(2) = 0 ' E+ ?7 [) y( R. y
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ptarr(0) = pt1(0)
3 ]0 V9 _2 g4 [% I" Q. S% g$ u; Zptarr(1) = pt1(1) % b w# l+ |3 m0 N e4 X
ptarr(2) = pt2(0) : k9 ]& R6 }/ W8 R1 f" q. U7 C
ptarr(3) = pt2(1)
. c' [: Z6 V" P. z1 M1 U3 h7 Tptarr(4) = pt3(0)
! D& }3 i# G S- ~4 r9 m {ptarr(5) = pt3(1)
" Y8 Y0 l4 v- e+ g5 [' ~ptarr(6) = pt1(0)
: X/ r. k% L+ L/ t5 f8 W4 k* T+ eptarr(7) = pt1(1)
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'畫(huà)多段線
$ h8 Z2 o/ _+ k2 T, c" TSet lens = ThisDrawing.ModelSpace.AddLightWeightPolyline(ptarr) 2 e- i$ \- A$ W9 n" i, Y
Dim objlist(0) As AcadEntity \& T2 r1 F: D2 Q& Q+ y
Set objlist(0) = lens 1 E5 Y+ v2 P O: ~& s4 x
1 k' {1 J0 R7 M) F7 E j8 M'將多段線變?yōu)槊嬗?
( Z2 w* N9 `5 r4 j: z sDim altregion As AcadRegion
6 r u7 E& p7 s0 ?- `- v5 palt = ThisDrawing.ModelSpace.AddRegion(objlist)
/ ?* G; {9 K1 w( ?0 gobjlist(0).Delete 5 k9 v9 U9 H* Y4 R5 s/ \ J) h
Set altregion = alt(0) " F* e3 R( [( X/ q
$ M, N* Y- t6 ^0 D9 ['旋轉(zhuǎn)面域得到圓錐
7 P: l, y+ }& a+ v& a7 ]ae = 2 * Atn(1) * 4
& o. ] p' s, T# kSet objboltb = ThisDrawing.ModelSpace.AddRevolvedSolid(altregion, pt1, pt33, ae) + E# c9 }; g5 S! W7 ]* K7 N
altregion.Delete
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'切圓錐得到拋物線 ! W0 a8 w/ l' o' G1 Z9 _8 i
Set al = objboltb.SectionSolid(bq1, bq2, bq3) . ~9 {; ~1 v% ?
objboltb.Delete ! e2 A% g. K: O1 E
al.Rotate bq1, a1 8 c/ ~8 Z2 Z# i4 `1 s4 y
al.Rotate3D bq1, bq4, a3
' \# v7 X( q4 g( r) gDim explodedobjects As Variant
" E- D) ]! V vexplodedobjects = al.Explode / m. X1 N, j& v! z# h
al.Delete
) d6 ]. \; y ]+ L* sDim i As Integer ; B6 ?" g: _. E$ `+ ]- o
Dim kind As String ! U1 |/ r. _; E D" r$ x
Dim parabolaobject As AcadSpline
( P' _* [' P, ?For i = 0 To UBound(explodedobjects) ], k4 U$ Y- u3 k& P2 S4 b
kind = explodedobjects(i).ObjectName 1 Y2 C8 N4 O6 j+ [! S5 i: g
If kind = "AcDbLine" Then
8 {% J4 u- _* A+ e% V- H explodedobjects(i).Delete 9 c2 o/ h/ V" a: L3 z
Else . d( {: T" C# W& |
Set parabolaobject = explodedobjects(i) ! N3 o0 W% G& f8 T% T$ y0 a% `
End If
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'旋轉(zhuǎn)拋物線 . _2 T/ M/ |' m7 U
ThisDrawing.SendCommand "rotate" & vbCr & "(Handent """ & parabolaobject.Handle & """)" & vbCr & "" & vbCr & bq1(0) & "," & bq1(1) & vbCr 1 D' O, W( v1 y @: p3 A6 l8 ?
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End Sub: d6 M# C) y" R0 J
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樓主: hyj_9766
發(fā)表于 2009-3-29 19:47:49
要活到老學(xué)到老,所以我們年輕人更應(yīng)該抓緊學(xué)習(xí)了，
