[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： MF5[lK9e  
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关键点说几个： EV]1ml k$  
1.区域是由点围成的，所以EXCEL中需要定义点的坐标（区域） s~^5kgPA  
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 +S o4rA*9  
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 Q'=x|K#xj  

以下是几个重要的函数： Z^3rLCa  
1.判断点在区域中函数 o#3ly-ht  
2.计算夹角函数
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3.转置函数 &u$Q4  
4.得到区域中心点，及区域半径函数 Q /U2^  
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） ,Vc6Gwm  
6.文件开启与关闭，这个最常见了，就不说了

'计算夹角函数 )|ju~qbf  
Function ff_angle(x1 As Single, y1 As Single, x2 As Single, y2 As Single, x3 As Single, y3 As Single) As Single {'7B6  
   cax = x2 - x1 kMIcK4.MH  
   cay = y2 - y1 W!Gq.M   
   cbx = x2 - x3 6AAz  
   cby = y2 - y3 V'z1  
   mo_jj = cax * cbx + cay * cby Vh|*p&  
   mo_ca = Sqr(cax * cax + cay * cay) t%d Z-Ym  
   mo_cb = Sqr(cbx * cbx + cby * cby) cuax;0{%  
   cos_acb = mo_jj / (mo_ca * mo_cb) g];!&R-  
   'ff_cos = cos_acb Kn5~d(:  
   If cos_acb >= 1 Then ER%^!xA  
   nn = 0 ~[t[y~Hup  
   ElseIf cos_acb <= -1 Then n1Yp1"2b[  
   nn = 3.14159265258979 %z=le7  
   Else Q*D;U[  
   nn = Atn(-cos_acb / Sqr(-cos_acb * cos_acb + 1)) + 2 * Atn(1) Kg{+T`  
   End If {&&z-^  
   'ff_angle = nn =x/X:;)>  
   ff_angle = nn * 180 / 3.14159265258979 R$R*'l  
End Function

'判断点在区域内函数 ^ gdaa>L  
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 nGC/R&  
Dim aob, boc, cod, doa, sum As Single on4HKeO  
  If ppx = p1x And ppy = p1y Then |Tv#4st  
     point_in = True p?02C#p  
     Exit Function 34f?6K1c  
  End If $zUP?Gq!  
  If ppx = p2x And ppy = p2y Then 4S7v:1~xe  
     point_in = True >R'F,  
     Exit Function C"y(5U)d  
  End If  0HZ{Y9]  
   If ppx = p3x And ppy = p3y Then W8G,=d}6  
     point_in = True ,V7nzhA2  
     Exit Function -M\<nx  
  End If n*h)'8`Ut  
     9=s<Ld  
    aob = ff_angle(p1x, p1y, ppx, ppy, p2x, p2y) zrvF]|1UP  
    boc = ff_angle(p2x, p2y, ppx, ppy, p3x, p3y) !Mx$A$Oj>  
    cod = ff_angle(p3x, p3y, ppx, ppy, p4x, p4y) 21n?=[  
    doa = ff_angle(p4x, p4y, ppx, ppy, p1x, p1y) G?yLo 'Ulo  
    sum = aob + boc + cod + doa _5w]a 2  
    If 360.01 > sum And sum > 359.99 Then F/]2G^-  
       point_in = True 2_>N/Z4T  
    Else R7%#U`Q^A  
       point_in = False zOJ%}  
    End If \P[Y`LYL  
End Function

'得到点半径,得到交点坐标函数 H8=N@l  
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() GC-5X`Sq  
    '求得中心点坐标 e[1hz_v  
Dim tt As String hDDn,uzpd  
Dim rt(3) As Single 9+|$$)  
    '判断是否平行 Q3'llOx  
   acx = p3x - p1x 6bg ;q(*7  
   acy = p3y - p1y Dm981t>wL  
   bdx = p4x - p2x #<fRE"v:Q  
   bdy = p4y - p2y [NTzcSN.  
   If acx * bdy = acy * bdx Then q
])K,)  
      rt(0) = 0 Xg6Jh``  
      Exit Function 1er TldX  
   Else 1C+13LE$U  
      '判断斜率存在否 {p2!|A&a  
      If p1x = p3x And p2x <> p4x Then hE{K=Tz$  
         tt = "ac_n_bd_y" `bq
<$e  
      ElseIf p1x <> p3x And p2x = p4x Then z^B,:5Tt  
         tt = "ac_y_bd_n" Q0sI(V#  
      ElseIf p1x <> p3x And p2x <> p4x Then Z-%\ <zT  
         tt = "ac_y_bd_y" iI T;K@&  
      End If '@v\{ l  
    Select Case tt #
~]zhHI  
         Case "ac_n_bd_y" 4
> K42m  
            'bd线段方程 
C[cbbp  
            k_bd = bdy / bdx CO/]wS  
            b_bd = p2y - k_bd * p2x (MM]N=Tw4  
            p_x = p1x fgTg7 m  
            p_y = k_bd * p_x + b_bd ~ah~cwmpS  
         Case "ac_y_bd_n" LENq_@$  
            'ac线段方程 w{8xpAqm  
            k_ac = acy / acx NWESP U):w  
            b_ac = p1y - k_ac * p1x J3V= 46Yc  
            p_x = p2x HQdxL*N%^  
            p_y = k_ac * p_x + b_ac ,L2ZinU:  
        Case "ac_y_bd_y" %6 zBSje  
           'ac，bd线段都要求 6Gl
J>r+n  
           k_ac = acy / acx C^Yb\N}S  
           b_ac = p1y - k_ac * p1x ^LnTOdAE  
           k_bd = bdy / bdx g/d<Zfq<{  
           b_bd = p2y - k_bd * p2x EU 6oQ  
           p_x = -(b_bd - b_ac) / (k_bd - k_ac) 0],r0  
           p_y = k_ac * p_x + b_ac  4\N;2N  
        End Select Pbn*
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      rt(1) = p_x %A/0 '  
      rt(2) = p_y d'gf
QlDny  
     HVCe;eI  
'计算最大半径 C[AqFo  
   rr1 = (p1x - p_x) * (p1x - p_x) + (p1y - p_y) * (p1y - p_y) ! I:%0
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   rr2 = (p2x - p_x) * (p2x - p_x) + (p2y - p_y) * (p2y - p_y) s]0{a.Cpv  
   rr3 = (p3x - p_x) * (p3x - p_x) + (p3y - p_y) * (p3y - p_y) oSKXt}sh  
   rr4 = (p4x - p_x) * (p4x - p_x) + (p4y - p_y) * (p4y - p_y) KK4`l}Fk:n  
Dim bb(5) As Single nc29j_Id  
  bb(1) = rr1 oCv.Ln1;Z  
  bb(2) = rr2 x8B}ZIbT9  
  bb(3) = rr3 r|8d 4  
  bb(4) = rr4 n38p!oS  
  nb = rr1 @i_FTN  
For i = 1 To 4 sE<V5`Z=  
    If nb <= bb(i) Then Q$W  
       nb = bb(i) $)i")=Hy  
    End If 05#1w#i  
Next i &BLJT9Frx  
    rt(0) = Sqr(nb) gs[uD5oo<  
    rr = rt() k"%~"9  
  End If ~Ffo-Nd-  
         ?!:ha;n  
End Function

高手啊.人才啊.

lifei0715:高手啊.人才啊. (2013-04-08 19:15)  t;Sb/3  

QB uMJm  
有热压工艺方面的人才或者资料分享下； =pO^7g  
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 jDfC=a])  

高手真多！

楼主威武霸气.