[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： {643Dz<e  
dWEx55>,1  
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关键点说几个： nfEk,(:  
1.区域是由点围成的，所以EXCEL中需要定义点的坐标（区域） [VHt#JuN,  
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 QS_xOQ '  
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 *HUqW}_r  

以下是几个重要的函数： n%}0hVu  
1.判断点在区域中函数 f3O'lc3  
2.计算夹角函数 A.Njn(z?Lz  
3.转置函数 CS  
4.得到区域中心点，及区域半径函数 x :s-\>RcA  
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） )deuB5kz  
6.文件开启与关闭，这个最常见了，就不说了

'计算夹角函数 vKxwv YDe  
Function ff_angle(x1 As Single, y1 As Single, x2 As Single, y2 As Single, x3 As Single, y3 As Single) As Single jw H)x  
   cax = x2 - x1 &e{&<ZVR  
   cay = y2 - y1 H~&'`
h1  
   cbx = x2 - x3 q>?oV(sF  
   cby = y2 - y3 i=+ "[h^  
   mo_jj = cax * cbx + cay * cby 59|Tmf(dS;  
   mo_ca = Sqr(cax * cax + cay * cay) IcN|e4t^J+  
   mo_cb = Sqr(cbx * cbx + cby * cby) 8Vp"}(Q  
   cos_acb = mo_jj / (mo_ca * mo_cb) I#0$5a},u^  
   'ff_cos = cos_acb iqpy5  
   If cos_acb >= 1 Then hhpH)Bi=  
   nn = 0 4r %NtXAa  
   ElseIf cos_acb <= -1 Then F C"dQ  
   nn = 3.14159265258979 '<O& :  
   Else SI\zW[IL  
   nn = Atn(-cos_acb / Sqr(-cos_acb * cos_acb + 1)) + 2 * Atn(1) ~*RNJ  
   End If Ha<(~qf  
   'ff_angle = nn ^#Shs^#  
   ff_angle = nn * 180 / 3.14159265258979 JA&w"2X*E  
End Function

'判断点在区域内函数 0@z78h=h  
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 m}k rG  
Dim aob, boc, cod, doa, sum As Single &
BP%~  
  If ppx = p1x And ppy = p1y Then yB&s2J  
     point_in = True I-^Y$6-  
     Exit Function B>Mk "WjQ  
  End If Rv }e+5F  
  If ppx = p2x And ppy = p2y Then \ ^_3Yw  
     point_in = True GSsot%B u"  
     Exit Function }I!D65-#'  
  End If z.FO6y6L  
   If ppx = p3x And ppy = p3y Then )
g)X~]*  
     point_in = True A+AqlM+$i  
     Exit Function |#"<{RS+w  
  End If Rb?6N  
     Y~,N,>nITu  
    aob = ff_angle(p1x, p1y, ppx, ppy, p2x, p2y) v]BN.SHE_  
    boc = ff_angle(p2x, p2y, ppx, ppy, p3x, p3y) $Z #  
    cod = ff_angle(p3x, p3y, ppx, ppy, p4x, p4y) -(P"+g3T  
    doa = ff_angle(p4x, p4y, ppx, ppy, p1x, p1y) C"K(-/  
    sum = aob + boc + cod + doa ><%z~s  
    If 360.01 > sum And sum > 359.99 Then GC.   
       point_in = True 4~DoqT  
    Else N,L$+wm  
       point_in = False +n7bbuxj(X  
    End If E`$d!7O  
End Function

'得到点半径,得到交点坐标函数 NvY%sx,  
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() C0J/FFBQ^  
    '求得中心点坐标 D}OvD |<-  
Dim tt As String @-)jU!  
Dim rt(3) As Single U,\3 !D0jt  
    '判断是否平行 [BWA$5D)Ny  
   acx = p3x - p1x *>I4X=  
   acy = p3y - p1y bkTk:-L5:  
   bdx = p4x - p2x Z$"E|nRN  
   bdy = p4y - p2y /SO 4O|b  
   If acx * bdy = acy * bdx Then @p~f*b4H?  
      rt(0) = 0 M|xd9kA^  
      Exit Function J4EQhuQ  
   Else +G)L8{FY(  
      '判断斜率存在否 j&~`H:=E  
      If p1x = p3x And p2x <> p4x Then 8R0Q-,'  
         tt = "ac_n_bd_y" ei%L[>N  
      ElseIf p1x <> p3x And p2x = p4x Then   
         tt = "ac_y_bd_n" A%(t'z  
      ElseIf p1x <> p3x And p2x <> p4x Then /x\{cHAt8J  
         tt = "ac_y_bd_y" KP
Tp91  
      End If CEzwI _  
    Select Case tt 9}G.Fr  
         Case "ac_n_bd_y" A0JlQE&U  
            'bd线段方程 dz_~_|  
            k_bd = bdy / bdx u)J&3Ah%  
            b_bd = p2y - k_bd * p2x W~b->F  
            p_x = p1x kbu.KU+  
            p_y = k_bd * p_x + b_bd ufq9+}  
         Case "ac_y_bd_n" R<]f[  
            'ac线段方程 2z#gn9Wb  
            k_ac = acy / acx re[v}cB  
            b_ac = p1y - k_ac * p1x FK ?g  
            p_x = p2x II;   
            p_y = k_ac * p_x + b_ac Ts)ox}rYVm  
        Case "ac_y_bd_y" DNwqi"  
           'ac，bd线段都要求 O7,)#{  
           k_ac = acy / acx lfTDpKz3D  
           b_ac = p1y - k_ac * p1x fRlO.!0(  
           k_bd = bdy / bdx S3fyt]pp  
           b_bd = p2y - k_bd * p2x cug=k  
           p_x = -(b_bd - b_ac) / (k_bd - k_ac) f~a]og5|G  
           p_y = k_ac * p_x + b_ac 8p"R4  
        End Select K%i9S;~  
      rt(1) = p_x ~!//|q^J]  
      rt(2) = p_y xQA6!j  
     T*pcS'?'  
'计算最大半径 \+,%RN.  
   rr1 = (p1x - p_x) * (p1x - p_x) + (p1y - p_y) * (p1y - p_y) T'8d|$X  
   rr2 = (p2x - p_x) * (p2x - p_x) + (p2y - p_y) * (p2y - p_y) ZF@T,i9  
   rr3 = (p3x - p_x) * (p3x - p_x) + (p3y - p_y) * (p3y - p_y) Ynxzkm S  
   rr4 = (p4x - p_x) * (p4x - p_x) + (p4y - p_y) * (p4y - p_y) JA!?vs  
Dim bb(5) As Single e:`d)GE  
  bb(1) = rr1 $e#V^dph  
  bb(2) = rr2 &-R(u}m-F  
  bb(3) = rr3 v2K6y|6,  
  bb(4) = rr4 {PBm dX  
  nb = rr1 aI^Z0[P+  
For i = 1 To 4 U]Pl` =SL  
    If nb <= bb(i) Then ai
s@|s;  
       nb = bb(i) qE:/~Q0  
    End If n.L/Xp@gc  
Next i ]'q"Kw/10  
    rt(0) = Sqr(nb) n=_jmR1  
    rr = rt() yUY* l@v]  
  End If CQ;.}=j ,  
         J!+)
v  
End Function

高手啊.人才啊.

lifei0715:高手啊.人才啊. (2013-04-08 19:15)  !ma%Zk  

*;u'W|"/~  
有热压工艺方面的人才或者资料分享下； $kD;*v=  
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 6aMG!_jC  

高手真多！

楼主威武霸气.