[分享]绝对随机网点分布（excel之vba） [复制链接]

想学习的请研究下，直接给程序就没意思了，由于公司想做一套导光板的模具，没有现成的软件可用，就自己做了较简单的程序，虽然简单，但基本功能已经满足了导光板网点设计的要求；具备功能：任意多边形区域；含有光轴，且可以根据光源调整；网点密度可沿光轴方向调整，效果图如下： gmAKW4(  
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h9n<ped`A;  

关键点说几个： [Z Gj7  
1.区域是由点围成的，所以EXCEL中需要定义点的坐标（区域） .Zt/e>K&  
2.需要定义光轴的方向；简便的方法就是指定光源坐标，及网点区域坐标，这样光轴就确定了 leYmVFE  
3.网点区域密度可调；把区域分成若干小块，每块的密度不同即可 ~V- o{IA  

以下是几个重要的函数： 6)
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1.判断点在区域中函数 v;qL?_:=c  
2.计算夹角函数 9/KQAc*  
3.转置函数 cWy0N  
4.得到区域中心点，及区域半径函数 4wD^?S!p  
5.再有就是若干个点抽取其中一部分；或者采用随机分布（该方法会有重合点，所以没采用） K:50?r_-6  
6.文件开启与关闭，这个最常见了，就不说了

'计算夹角函数 s"F,=]HQ!G  
Function ff_angle(x1 As Single, y1 As Single, x2 As Single, y2 As Single, x3 As Single, y3 As Single) As Single l>P~M50D?{  
   cax = x2 - x1 Jpnp'  
   cay = y2 - y1 W]
7?;#Hpk  
   cbx = x2 - x3 TEyPlSGG  
   cby = y2 - y3 \/%Q PE8  
   mo_jj = cax * cbx + cay * cby F+-MafN7Y  
   mo_ca = Sqr(cax * cax + cay * cay) uHh2>Px  
   mo_cb = Sqr(cbx * cbx + cby * cby) (P]^5D  
   cos_acb = mo_jj / (mo_ca * mo_cb) }slEkpk?]  
   'ff_cos = cos_acb EHJc*WFPU-  
   If cos_acb >= 1 Then #
!j&L6  
   nn = 0 5d;K.O  
   ElseIf cos_acb <= -1 Then [beuDZA  
   nn = 3.14159265258979 g+{MvSj$  
   Else r 24]2A  
   nn = Atn(-cos_acb / Sqr(-cos_acb * cos_acb + 1)) + 2 * Atn(1) ;b2>
y>?[  
   End If UM^hF%  
   'ff_angle = nn l%w|f`B:  
   ff_angle = nn * 180 / 3.14159265258979 fkG"72 95A  
End Function

'判断点在区域内函数 ^U1+D^AJ  
Function point_in(p1x As Single, p1y As Single, p2x As Single, p2y As Single, p3x As Single, p3y As Single, p4x As Single, p4y As Single, ppx As Single, ppy As Single) As Boolean  KX@Fgs  
Dim aob, boc, cod, doa, sum As Single xk<0QYv   
  If ppx = p1x And ppy = p1y Then 'a9.JS[pj  
     point_in = True &$ 9bC't6  
     Exit Function ba.OjK@  
  End If P=g+6-1  
  If ppx = p2x And ppy = p2y Then $x<-PN  
     point_in = True (9h{6rc=I  
     Exit Function w%"q=V  
  End If yw^,@'  
   If ppx = p3x And ppy = p3y Then }?$Mh)  
     point_in = True riQ?'!a7  
     Exit Function ![Y$[l  
  End If wjs7K|PK  
     ~'Hwszpb  
    aob = ff_angle(p1x, p1y, ppx, ppy, p2x, p2y) cwM0Z6  
    boc = ff_angle(p2x, p2y, ppx, ppy, p3x, p3y) oWT0WS  
    cod = ff_angle(p3x, p3y, ppx, ppy, p4x, p4y) DtX{0p<T3  
    doa = ff_angle(p4x, p4y, ppx, ppy, p1x, p1y) `8*$$JC  
    sum = aob + boc + cod + doa |hAGgo/03  
    If 360.01 > sum And sum > 359.99 Then Y"U&3e,  
       point_in = True n+w>Qz'  
    Else r,\(Y@I  
       point_in = False AUd}) UR  
    End If o!N@W  
End Function

'得到点半径,得到交点坐标函数 e78}  
Function rr(p1x As Single, p1y As Single, p2x As Single, p2y As Single, p3x As Single, p3y As Single, p4x As Single, p4y As Single) As Single() /fEXAk  
    '求得中心点坐标 xae
7#d0  
Dim tt As String -u(#V#}OV?  
Dim rt(3) As Single [DviN  
    '判断是否平行 }#@LZ)]hK  
   acx = p3x - p1x hvwr!(|W  
   acy = p3y - p1y iQQJ`  
   bdx = p4x - p2x scmbDaOn  
   bdy = p4y - p2y j  jQ=  
   If acx * bdy = acy * bdx Then (G Y`O  
      rt(0) = 0 6kk(FVX  
      Exit Function _{8boDX#  
   Else W3#L!&z_wK  
      '判断斜率存在否 "7d_$.Z  
      If p1x = p3x And p2x <> p4x Then ;
F-kE4w  
         tt = "ac_n_bd_y" ]v@,>!Wn  
      ElseIf p1x <> p3x And p2x = p4x Then >{[J+f{~|  
         tt = "ac_y_bd_n" uFgw eOJ  
      ElseIf p1x <> p3x And p2x <> p4x Then b?l\QMvi  
         tt = "ac_y_bd_y" =6
hf'lP  
      End If Yi3DoaS;"  
    Select Case tt 5;+Bl@zGu  
         Case "ac_n_bd_y" -#@;-2w  
            'bd线段方程 f sMF46  
            k_bd = bdy / bdx `O F\f  
            b_bd = p2y - k_bd * p2x YR>xh2< 9  
            p_x = p1x u=5^xpI<D
 
            p_y = k_bd * p_x + b_bd tBt\&{=|D  
         Case "ac_y_bd_n" wS*UXF&f  
            'ac线段方程 S!uyplYKF  
            k_ac = acy / acx O-RiDYej  
            b_ac = p1y - k_ac * p1x '?nhpT^  
            p_x = p2x _[V 6s#Wk3  
            p_y = k_ac * p_x + b_ac [Fe5a  
        Case "ac_y_bd_y" *e=e7KC6kI  
           'ac，bd线段都要求 :v+39  
           k_ac = acy / acx g~]FI
  
           b_ac = p1y - k_ac * p1x {|50&]m  
           k_bd = bdy / bdx !^%b|=[  
           b_bd = p2y - k_bd * p2x _nF_RpS  
           p_x = -(b_bd - b_ac) / (k_bd - k_ac) tO#y4<  
           p_y = k_ac * p_x + b_ac 1 OX(eXF>  
        End Select 7_LE2jpC,5  
      rt(1) = p_x Ngr7E  
      rt(2) = p_y z\a#"2(G.  
     gs'(px  
'计算最大半径 FRr<K^M  
   rr1 = (p1x - p_x) * (p1x - p_x) + (p1y - p_y) * (p1y - p_y) d]<tFx>CQW  
   rr2 = (p2x - p_x) * (p2x - p_x) + (p2y - p_y) * (p2y - p_y) Y,{Xv  
   rr3 = (p3x - p_x) * (p3x - p_x) + (p3y - p_y) * (p3y - p_y) MQ01!Y[q_7  
   rr4 = (p4x - p_x) * (p4x - p_x) + (p4y - p_y) * (p4y - p_y) My)/d]a  
Dim bb(5) As Single 9tJiIr8i  
  bb(1) = rr1 ^K8Ey#T  
  bb(2) = rr2 |&7l*j(\  
  bb(3) = rr3
dPS}\&1  
  bb(4) = rr4 dS-
l2 $n  
  nb = rr1 qzXch["So  
For i = 1 To 4 d)LifsD)  
    If nb <= bb(i) Then 7yKadM~)  
       nb = bb(i) aX~7
NslR  
    End If Pm-@ZZ~  
Next i H}d&>!\}F  
    rt(0) = Sqr(nb) Wn|w~{d{  
    rr = rt() ) Limt<S  
  End If tH$Z_(5  
         l+@NjZGm<  
End Function

高手啊.人才啊.

lifei0715:高手啊.人才啊. (2013-04-08 19:15)  I'm.+(1m,  

=c:K(N qL  
有热压工艺方面的人才或者资料分享下； qf-0 | w  
我公司主要做透镜类产品，现在有客户要审核我公司的导光膜工艺，头疼 )cxLpTr  

高手真多！

楼主威武霸气.