[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： CMa6':~  
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关键点说几个： /
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1.区域是由点围成的，所以EXCEL中需要定义点的坐标（区域） XYEwn_Y  
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 $Ome]+0  
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 #Y'eS'lv4  

以下是几个重要的函数： Y G+|r  
1.判断点在区域中函数 ?,} u6tH  
2.计算夹角函数 \br!77  
3.转置函数 &V"o
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4.得到区域中心点，及区域半径函数 oMh$:jR$
 
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） V%Uj\cv  
6.文件开启与关闭，这个最常见了，就不说了

'计算夹角函数 aZfMeW  
Function ff_angle(x1 As Single, y1 As Single, x2 As Single, y2 As Single, x3 As Single, y3 As Single) As Single g: i5%1  
   cax = x2 - x1 >lI7]hbIs  
   cay = y2 - y1 U|^xr~q!f-  
   cbx = x2 - x3 ui8 Q2{z  
   cby = y2 - y3 v2T2/y%  
   mo_jj = cax * cbx + cay * cby mH*ldf;J;=  
   mo_ca = Sqr(cax * cax + cay * cay) FpoHm%+  
   mo_cb = Sqr(cbx * cbx + cby * cby) %!aU{E|@_  
   cos_acb = mo_jj / (mo_ca * mo_cb) .sMs_ 5D  
   'ff_cos = cos_acb Z\&f"z?L  
   If cos_acb >= 1 Then >)><u4}  
   nn = 0 h2l;xt
 
   ElseIf cos_acb <= -1 Then X{9^$/XsJ  
   nn = 3.14159265258979 SI(f&T(  
   Else /{M<FVXK+|  
   nn = Atn(-cos_acb / Sqr(-cos_acb * cos_acb + 1)) + 2 * Atn(1) rpNb.  
   End If 6j#JhcS+  
   'ff_angle = nn ,75)  
   ff_angle = nn * 180 / 3.14159265258979 hor7~u+  
End Function

'判断点在区域内函数 ,_z79tC{s  
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 ]#/nn),Z  
Dim aob, boc, cod, doa, sum As Single `e[S Zj\  
  If ppx = p1x And ppy = p1y Then C]^Ep
  
     point_in = True kY0HP a  
     Exit Function [%W'd9`>  
  End If 7qKz_O  
  If ppx = p2x And ppy = p2y Then 2e48L677-  
     point_in = True QcegT/vO  
     Exit Function %?~'A59  
  End If FU`(mQ*Yd  
   If ppx = p3x And ppy = p3y Then WQ|:TLQ  
     point_in = True ,'L>:pF3  
     Exit Function `oRyw6Sko  
  End If kVnRSg}R  
     wj[yo S  
    aob = ff_angle(p1x, p1y, ppx, ppy, p2x, p2y) :X2_#qW#C  
    boc = ff_angle(p2x, p2y, ppx, ppy, p3x, p3y) 2& Q\W  
    cod = ff_angle(p3x, p3y, ppx, ppy, p4x, p4y) rPxRGoR  
    doa = ff_angle(p4x, p4y, ppx, ppy, p1x, p1y) jNZ.Fb  
    sum = aob + boc + cod + doa :e1h!G  
    If 360.01 > sum And sum > 359.99 Then dQ:,pe7A  
       point_in = True dSI"yz  
    Else YAi-eL67l  
       point_in = False Mz+I YP`L  
    End If "be\%W+<  
End Function

'得到点半径,得到交点坐标函数 gC7!cn  
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() MGdzrcF  
    '求得中心点坐标 )Q
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Dim tt As String Bwg(f_[1  
Dim rt(3) As Single U1`5P!ov  
    '判断是否平行 >t+ ENYb  
   acx = p3x - p1x DYX{v`>f^  
   acy = p3y - p1y Sv=YI
 
   bdx = p4x - p2x m\teE]8x  
   bdy = p4y - p2y S!K<kn`E3  
   If acx * bdy = acy * bdx Then ,GOIg|51  
      rt(0) = 0 tFU4%c7V  
      Exit Function fe .=Z&  
   Else `$a!CJu,  
      '判断斜率存在否 VoCg,gow   
      If p1x = p3x And p2x <> p4x Then ,%!m%+K9a  
         tt = "ac_n_bd_y" XG#?fr}L  
      ElseIf p1x <> p3x And p2x = p4x Then w4 yrAj 2  
         tt = "ac_y_bd_n" T!/o^0w  
      ElseIf p1x <> p3x And p2x <> p4x Then A%w9Da?B  
         tt = "ac_y_bd_y" ,fjY|ip  
      End If B>{%$@4  
    Select Case tt qI'pjTMDY  
         Case "ac_n_bd_y" Iv6 lE:)  
            'bd线段方程 (Cr  
            k_bd = bdy / bdx YNr5*P1  
            b_bd = p2y - k_bd * p2x @&T' h}|:  
            p_x = p1x wd:Yy  
            p_y = k_bd * p_x + b_bd nDi^s{  
         Case "ac_y_bd_n" !vX4_!%  
            'ac线段方程 @@R Mm$  
            k_ac = acy / acx ?K$&|w%{3  
            b_ac = p1y - k_ac * p1x iXWzIb}CJ-  
            p_x = p2x 8W3zrnc  
            p_y = k_ac * p_x + b_ac [;m@A\F  
        Case "ac_y_bd_y" 0E\#!L  
           'ac，bd线段都要求 }6Pbjm*  
           k_ac = acy / acx .!1[I{KU  
           b_ac = p1y - k_ac * p1x (
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           k_bd = bdy / bdx m.++nF  
           b_bd = p2y - k_bd * p2x _'D(>e?  
           p_x = -(b_bd - b_ac) / (k_bd - k_ac) `%YMUBaI  
           p_y = k_ac * p_x + b_ac MlTC?Rp#  
        End Select x'EEmjJ  
      rt(1) = p_x Z?P^Y%ls  
      rt(2) = p_y +~n:*\  
     Nuqmp7C  
'计算最大半径 2ZxhV4\  
   rr1 = (p1x - p_x) * (p1x - p_x) + (p1y - p_y) * (p1y - p_y) <^s31.&p  
   rr2 = (p2x - p_x) * (p2x - p_x) + (p2y - p_y) * (p2y - p_y) !B`z|#  
   rr3 = (p3x - p_x) * (p3x - p_x) + (p3y - p_y) * (p3y - p_y) #WjQ'c:  
   rr4 = (p4x - p_x) * (p4x - p_x) + (p4y - p_y) * (p4y - p_y) /? %V% n  
Dim bb(5) As Single sOqFEvzo1%  
  bb(1) = rr1 9!AvsC9  
  bb(2) = rr2 P!-RZEt$  
  bb(3) = rr3 Y"
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  bb(4) = rr4 [IHo ~  
  nb = rr1 v4e4,Nt  
For i = 1 To 4 eb7UA=[Z  
    If nb <= bb(i) Then 6UC
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       nb = bb(i) `E|i
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    End If 1$RJzHS  
Next i &~2m@X(o  
    rt(0) = Sqr(nb) :E}
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    rr = rt() !<TkX/O  
  End If ]QlW{J  
         !h1:AW_iz  
End Function

高手啊.人才啊.

lifei0715:高手啊.人才啊. (2013-04-08 19:15)  =s!0EwDH3  

1N(#4mE=  
有热压工艺方面的人才或者资料分享下； zHA::6OgPN  
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 B!pz0K*uG  

高手真多！

楼主威武霸气.