[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： )\D2\1e(c  
T=^jCH &  

描述:请输入描述

图片:2.jpg

E]\D>[0O  

关键点说几个： dFdlB`L  
1.区域是由点围成的，所以EXCEL中需要定义点的坐标（区域） Sjw2 j#Q  
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 N[0 xqQ  
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 S&5Q~}{,  

以下是几个重要的函数： l.XknF  
1.判断点在区域中函数 >]:N?[Y_~}  
2.计算夹角函数 $?[1#%  
3.转置函数 TTeAa  
4.得到区域中心点，及区域半径函数 X!,#'&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） 30A`\+^f  
6.文件开启与关闭，这个最常见了，就不说了

'计算夹角函数 B@ZqJw9J[  
Function ff_angle(x1 As Single, y1 As Single, x2 As Single, y2 As Single, x3 As Single, y3 As Single) As Single g,00'z_D  
   cax = x2 - x1 }s`jl``PM  
   cay = y2 - y1 Ul'~opf  
   cbx = x2 - x3 S1D9AcK  
   cby = y2 - y3 di-O*ug  
   mo_jj = cax * cbx + cay * cby b}ySZlmy  
   mo_ca = Sqr(cax * cax + cay * cay) hknwis%y  
   mo_cb = Sqr(cbx * cbx + cby * cby) BengRG[  
   cos_acb = mo_jj / (mo_ca * mo_cb) e#l*/G*,  
   'ff_cos = cos_acb )m|X;eEo  
   If cos_acb >= 1 Then xDPQG`6  
   nn = 0 aDm-X r  
   ElseIf cos_acb <= -1 Then (Wm/$P;  
   nn = 3.14159265258979 XX]5T`D  
   Else M[:O(  
   nn = Atn(-cos_acb / Sqr(-cos_acb * cos_acb + 1)) + 2 * Atn(1) YH/S2D  
   End If AzHIp^  
   'ff_angle = nn YWt"|  
   ff_angle = nn * 180 / 3.14159265258979 Jo6~r-  
End Function

'判断点在区域内函数 p?dGZ2` [I  
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 s`8M%ZLu  
Dim aob, boc, cod, doa, sum As Single >>oASo  
  If ppx = p1x And ppy = p1y Then v$gMLu=  
     point_in = True Bq$e|t)'  
     Exit Function HI"!n$p  
  End If "TBQNWZ  
  If ppx = p2x And ppy = p2y Then l}2%?d  
     point_in = True jSeA%Te  
     Exit Function jMz1s%C  
  End If )8 "EI-/.  
   If ppx = p3x And ppy = p3y Then Sb:zN'U  
     point_in = True QrNL7{  
     Exit Function &;
6|nl9;  
  End If r85Xa'hh  
     YLA557~  
    aob = ff_angle(p1x, p1y, ppx, ppy, p2x, p2y) %=NM_5a}]  
    boc = ff_angle(p2x, p2y, ppx, ppy, p3x, p3y) |xsV(jK8  
    cod = ff_angle(p3x, p3y, ppx, ppy, p4x, p4y) )Dk0V!%N  
    doa = ff_angle(p4x, p4y, ppx, ppy, p1x, p1y) Z,|1G6f@  
    sum = aob + boc + cod + doa PBxK>a  
    If 360.01 > sum And sum > 359.99 Then 3PvZ_!G  
       point_in = True H y.3ccZ0  
    Else `_J^g&y~  
       point_in = False y~]IVl"  
    End If Y^c,mK^  
End Function

'得到点半径,得到交点坐标函数 <\}Y@g8  
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() 9z|>roNe  
    '求得中心点坐标 L5zG0mC8  
Dim tt As String u'$yYzBE  
Dim rt(3) As Single %|D\j-~  
    '判断是否平行 c5B_WqjJ  
   acx = p3x - p1x T}w*K[z $  
   acy = p3y - p1y CD8JYiJ  
   bdx = p4x - p2x JL.ydH79  
   bdy = p4y - p2y r'9=
kx  
   If acx * bdy = acy * bdx Then @R'g@+{I  
      rt(0) = 0 9h3~;Q  
      Exit Function VeN&rjc  
   Else ."!8B9
s  
      '判断斜率存在否 ]df9'\  
      If p1x = p3x And p2x <> p4x Then (.quX@w"m  
         tt = "ac_n_bd_y" uhw5O9  
      ElseIf p1x <> p3x And p2x = p4x Then ~7ATt8T  
         tt = "ac_y_bd_n" /SPAJHh  
      ElseIf p1x <> p3x And p2x <> p4x Then \[IdR^<YM  
         tt = "ac_y_bd_y" 7uv/@(J"$  
      End If 0'\FrG  
    Select Case tt Wy^[
4|6  
         Case "ac_n_bd_y" 9s\i
(/RxW  
            'bd线段方程 p+`*~6Jj/  
            k_bd = bdy / bdx px [1#*  
            b_bd = p2y - k_bd * p2x (1elF
)  
            p_x = p1x t5X^(@q4N  
            p_y = k_bd * p_x + b_bd +}(B856+  
         Case "ac_y_bd_n" 2W"cTm  
            'ac线段方程 q*RaX 4V  
            k_ac = acy / acx \6`%NhkM_  
            b_ac = p1y - k_ac * p1x {o
5K?Pb  
            p_x = p2x tRUsZl  
            p_y = k_ac * p_x + b_ac hBfzU\*0H  
        Case "ac_y_bd_y" 8Snq75Q<   
           'ac，bd线段都要求 LKf5r,C  
           k_ac = acy / acx :|m~<'g  
           b_ac = p1y - k_ac * p1x B yy-Cc  
           k_bd = bdy / bdx ~U7\ L
BF  
           b_bd = p2y - k_bd * p2x hyvV%z Z  
           p_x = -(b_bd - b_ac) / (k_bd - k_ac) }*}`)rj,  
           p_y = k_ac * p_x + b_ac YW$x:  
        End Select {ck  
      rt(1) = p_x UB&S 2
g  
      rt(2) = p_y J%Z)#  
     SbPjU50  
'计算最大半径 YAC zznN  
   rr1 = (p1x - p_x) * (p1x - p_x) + (p1y - p_y) * (p1y - p_y) qs c-e,rl  
   rr2 = (p2x - p_x) * (p2x - p_x) + (p2y - p_y) * (p2y - p_y) >h!.Gj  
   rr3 = (p3x - p_x) * (p3x - p_x) + (p3y - p_y) * (p3y - p_y) #Rm=Em}d  
   rr4 = (p4x - p_x) * (p4x - p_x) + (p4y - p_y) * (p4y - p_y) '9p5
UC  
Dim bb(5) As Single 1[gjb((  
  bb(1) = rr1 TN
Fm7}=  
  bb(2) = rr2 ^d5./M8Bd  
  bb(3) = rr3 5k%N<e``  
  bb(4) = rr4 xZ @O"*{  
  nb = rr1 8F\Msx  
For i = 1 To 4 (fGJP*YO  
    If nb <= bb(i) Then ^$Eiz.  
       nb = bb(i) PM@s}(  
    End If _@~kYz  
Next i #g`cih=QL  
    rt(0) = Sqr(nb) ]g-qWSKU  
    rr = rt() P!6e  
  End If G}dOx}kT  
         dI0>m:RBz  
End Function

高手啊.人才啊.

lifei0715:高手啊.人才啊. (2013-04-08 19:15)  O+Lb***b"  

. .je<  
有热压工艺方面的人才或者资料分享下； u{nWjqrM*5  
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 78inh
%  

高手真多！

楼主威武霸气.