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
& l8 ?* }2 H, F$ E8 J9 @9 }+ ~1.先用直線命令畫一直線（圖1）,。過程如下：
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- z* c' i4 {; _2 x* i 命令: LINE
9 R7 x$ y) D3 B 指定第一點(diǎn): 0,0
" R7 R6 H4 q# H 指定下一點(diǎn)或 [放棄(U)]: 'cal: W6 N' Q& {: i; r6 A- i
>> 表達(dá)式: +[100*100/200<-30]
, N$ a/ i3 B5 Q, v; g" X (43.3013 -25.0 0.0)
8 j; ]6 m: [3 u) r u7 P; P9 R. q( I 指定下一點(diǎn)或 [放棄(U)]: ↙9 R" m8 H% p: t5 R
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2.移動(dòng)該直線,，如圖2。# Y9 \, M7 Y, f9 T" \( N! z. ]) r
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3.用多段線命令畫多段線,，先向-60度方向拉出適當(dāng)長度,，如圖3。
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' |/ N7 `/ p$ d! ] 4.繼續(xù)畫多段線,，完成一個(gè)直角三角形,，如圖4。
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! s, N7 X7 E) Y G 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。過程如下：
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命令: REVOLVE- P/ O, ?3 s# A7 [/ V) B, f6 _* g2 O
當(dāng)前線框密度: ISOLINES=4+ `- A$ P9 r) t5 a5 ?# y
選擇對(duì)象:（選擇直角三角形）
! {4 E1 w+ D4 v# }. Z+ V% ~6 N 選擇對(duì)象: ↙6 y; g. f3 d4 q) ?) V, T( Q7 }& l
指定旋轉(zhuǎn)軸的起點(diǎn)或
* j; y' m, w( {/ u; B6 o0 d 定義軸依照 [對(duì)象(O)/X 軸(X)/Y 軸(Y)]:（捕捉A點(diǎn)）
1 i9 ~; j0 q; p; b 指定軸端點(diǎn): （捕捉B點(diǎn)）
7 ?% Y) f" w+ r- Q4 A* Q/ I& I 指定旋轉(zhuǎn)角度 <360>:↙
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9 t4 C7 q# C! z) W1 c/ b- b 6.用SECTION命令切割三維實(shí)體,，生成一個(gè)面域,，如圖6。過程如下：
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命令: SECTION! o0 ]3 r( p9 @) f: C3 x* ]7 N$ l7 A1 T
選擇對(duì)象: (選擇上一步生成的旋轉(zhuǎn)實(shí)體)
1 m& W0 F* }: u1 V4 S: a 選擇對(duì)象: ↙
9 k3 D8 }9 ?# s0 [- z: A: q5 O 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)>: yz5 Q* F# C2 O; V
指定 YZ 平面上的點(diǎn) <0,0,0>:（捕捉C點(diǎn)）
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, u7 j6 z7 J/ S6 x8 V% T 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,。過程如下：) j+ _$ H' [4 Y8 h* q9 ]3 }$ v
5 Q( b$ Z, J4 M: E 命令: rotate3d; Z" X) L, q2 M# } ~! ^
當(dāng)前正向角度: ANGDIR=逆時(shí)針 ANGBASE=06 ^" f8 N5 X! K* C/ s7 O8 I, w
選擇對(duì)象: （選擇上一步生成的面域）
; _% O* B( \" F1 T 選擇對(duì)象: ↙
6 r) p# x* G7 m& Z7 f: U 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)）! S9 Q6 y* U$ c5 Y- ]( c" I& |
指定旋轉(zhuǎn)角度或 [參照(R)]: 909 n7 R0 P1 Z0 P' O
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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,。$ l* E5 l( H; u& j
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9.移動(dòng)拋物線，如圖9,。完畢,！
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& x( K w; M0 m; }$ g2 ehttp://bbs.icax.cn/register.php
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Sub trparabola()
, h. j0 w0 l0 f8 @( i" A' ODim bq1, bq2, pt1, pt2 As Variant
" w. E# h l; z5 j8 tDim aa, ll, yy, a1, a2, a3, a4, aa1, pt3(0 To 2), bq4(0 To 2) As Double
5 K) A& j4 Z7 c. I# F! YDim bq3(0 To 2) As Double 0 B) }( @/ a- s. S
Dim ae As Double
$ t0 a# h ]' w9 t5 F/ H; i/ pDim pt33(0 To 2) As Double ' i2 @4 ]( p: m& G9 V% g
Dim ptarr(0 To 7) As Double
, ?& y7 D% j0 w" @Dim alt As Variant 9 ^) J& r) @" C$ |5 c$ B
Dim objboltb As Acad3DSolid
5 m3 L( h0 Z0 Z" I1 K! G2 jDim al As Variant 1 A, Y* V5 y) ]" O0 O
Dim lens As AcadLWPolyline
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'求個(gè)控制點(diǎn)
2 X6 q9 i3 ], O& w/ x' Sbq1 = ThisDrawing.Utility.GetPoint(, "拋物線頂點(diǎn): ")
/ _, Z7 X' P, Y! @- gaa = ThisDrawing.Utility.GetReal("輸入二次項(xiàng)系數(shù)： ")
4 r( Q5 p$ z/ ]6 j3 G% w' J9 E* vll = ThisDrawing.Utility.GetDistance(, "輸入開口弦長： ") + i/ T2 z6 D' ]% y* u
aa1 = 1 / aa
# Z9 t+ s( E W% ^4 A* Iyy = aa * (ll / 2) ^ 2
7 c$ c. ?$ \& n' ha1 = ThisDrawing.Utility.AngleToReal(-30, acDegrees)
+ Y5 d7 j3 U0 G E+ ua2 = ThisDrawing.Utility.AngleToReal(30, acDegrees)
( D# s S; \% E" `0 n6 Va3 = ThisDrawing.Utility.AngleToReal(90, acDegrees)
' b$ k' \3 F8 ma4 = ThisDrawing.Utility.AngleToReal(150, acDegrees) 1 u' d3 f; f6 z6 y5 W, l
bq2 = ThisDrawing.Utility.PolarPoint(bq1, a2, yy)
& S4 _# X# f7 x6 F" j4 m! |pt1 = ThisDrawing.Utility.PolarPoint(bq1, a4, aa1) ) O4 j0 R2 Z6 {; M
pt2 = ThisDrawing.Utility.PolarPoint(bq2, a3, aa1)
' _ D3 a) E5 u* h8 q9 R! s0 @pt3(0) = pt2(0): pt3(1) = pt1(1): pt3(2) = pt1(2) : e" n* d1 j" m) e- M+ g m& k5 l
bq3(0) = bq2(0): bq3(1) = bq2(1): bq3(2) = bq2(2) + 10
& {3 A3 T6 |, a$ e: \4 ~$ z2 @. H/ `bq4(0) = bq2(0): bq4(1) = bq1(1): bq4(2) = bq1(2) * e; P0 u. _% c
pt33(0) = 10: pt33(1) = 0: pt33(2) = 0
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ptarr(0) = pt1(0) + W# L5 k4 v" {4 n8 F$ E
ptarr(1) = pt1(1) B7 P( \/ B9 E: K9 I, W& j
ptarr(2) = pt2(0)
4 V0 r8 }& L+ r: `. \, ^ptarr(3) = pt2(1)
9 w9 L/ z+ \7 l3 U! [4 Vptarr(4) = pt3(0)
5 F! f j( a. C! Y# bptarr(5) = pt3(1) / z% S1 A/ {1 ?+ w# j( x) n2 b
ptarr(6) = pt1(0) - s; H* L* d9 F3 V: f
ptarr(7) = pt1(1) $ Q9 l+ U/ X8 p+ d o
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'畫多段線 ( R8 S* q/ `) N! q) A" _2 E
Set lens = ThisDrawing.ModelSpace.AddLightWeightPolyline(ptarr) $ M1 T; [1 |, n8 h% K8 X7 q9 y( y7 }
Dim objlist(0) As AcadEntity
* u! ~0 Q1 g9 p* P* n1 gSet objlist(0) = lens - W7 V. r2 Y3 j, p4 R# D4 y
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'將多段線變?yōu)槊嬗?
h* Q# d% u0 b o. `Dim altregion As AcadRegion 3 r- F; Z+ n! q$ u
alt = ThisDrawing.ModelSpace.AddRegion(objlist) 7 o0 |4 G1 i5 I' |
objlist(0).Delete 5 w- [% G* X# b1 M! Z
Set altregion = alt(0)
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'旋轉(zhuǎn)面域得到圓錐 $ f/ Z+ f5 A3 U: ^) F+ x' o. ~
ae = 2 * Atn(1) * 4 ) M/ y Z7 o5 `: }2 `. t
Set objboltb = ThisDrawing.ModelSpace.AddRevolvedSolid(altregion, pt1, pt33, ae)
4 H$ x5 ]. o* y% ~2 Ualtregion.Delete
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8 w7 d8 D# T* L0 t' r6 F8 H'切圓錐得到拋物線 8 ~0 W* A. D) ^
Set al = objboltb.SectionSolid(bq1, bq2, bq3) 6 a) U9 g* P. g3 ^
objboltb.Delete ' L+ F4 W) b! H2 f0 x& q
al.Rotate bq1, a1 / W6 s' O8 Y" Z& S- |
al.Rotate3D bq1, bq4, a3 , |, g- |; H( Z
Dim explodedobjects As Variant
2 r5 ?; o/ w" T/ H. h5 vexplodedobjects = al.Explode ' i) r9 ]5 o3 k% Q- z' G
al.Delete $ F! l. k# H) ]4 \" b7 G7 u% r
Dim i As Integer
6 a5 e& \6 K# W+ h. v, W$ lDim kind As String
5 u6 j2 E; w, r& ^7 G8 NDim parabolaobject As AcadSpline 9 g7 L' A H$ k$ u& }) `
For i = 0 To UBound(explodedobjects)
, u7 n( w$ r# _* f* B( l: c' A4 a. nkind = explodedobjects(i).ObjectName , H& u j3 @2 K* }; k/ T. B$ S
If kind = "AcDbLine" Then 0 j" }: b+ l) @2 ^" y0 s: f
explodedobjects(i).Delete
1 C! J% I( s8 Z Else
3 d3 M3 l5 h" j& o, F7 h: v" C Set parabolaobject = explodedobjects(i) # \; Z+ d% d/ D! i+ ^/ b
End If
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. |# p' g' S1 W'旋轉(zhuǎn)拋物線
2 ]4 m& n7 |' ~+ f$ O2 E1 ?( R& hThisDrawing.SendCommand "rotate" & vbCr & "(Handent """ & parabolaobject.Handle & """)" & vbCr & "" & vbCr & bq1(0) & "," & bq1(1) & vbCr m# L$ F/ w- P- ^ Y1 I9 b
( O! E' ~. G yEnd Sub
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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,，
