[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： aU +uPP  
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图片:2.jpg

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关键点说几个： ctgH/SU  
1.区域是由点围成的，所以EXCEL中需要定义点的坐标（区域） 'bji2#z[  
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 UHl1>(U  
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 qsN}KgTjg  

以下是几个重要的函数： 5',b~Pp  
1.判断点在区域中函数 "g!/^A!!  
2.计算夹角函数 Y^?PHz'Go  
3.转置函数 3z 5"Ckzb  
4.得到区域中心点，及区域半径函数 )]}68}9  
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） Q|Pm8{8  
6.文件开启与关闭，这个最常见了，就不说了

'计算夹角函数 n22OPvp  
Function ff_angle(x1 As Single, y1 As Single, x2 As Single, y2 As Single, x3 As Single, y3 As Single) As Single ?7*J4.  
   cax = x2 - x1 28,HZaXhc  
   cay = y2 - y1 ;xE1#ZT  
   cbx = x2 - x3 ?rwHkPJ{*  
   cby = y2 - y3 +Kg3qS"  
   mo_jj = cax * cbx + cay * cby )%?SWuS?N  
   mo_ca = Sqr(cax * cax + cay * cay) H`U>ZJ.  
   mo_cb = Sqr(cbx * cbx + cby * cby) (7PVfS>;  
   cos_acb = mo_jj / (mo_ca * mo_cb) Bk4|ik}  
   'ff_cos = cos_acb <C7/b#4>\  
   If cos_acb >= 1 Then p
["20?^  
   nn = 0 h6gtO$A|p=  
   ElseIf cos_acb <= -1 Then `XwKCI  
   nn = 3.14159265258979 fPsUIlI/A  
   Else [%7oq;^J  
   nn = Atn(-cos_acb / Sqr(-cos_acb * cos_acb + 1)) + 2 * Atn(1) .`N&,&H  
   End If oth=#hfU^  
   'ff_angle = nn Ru`7Xd.
  
   ff_angle = nn * 180 / 3.14159265258979 U[l{cRT   
End Function

'判断点在区域内函数 `BZX\LPHm  
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
\rf2Os  
Dim aob, boc, cod, doa, sum As Single +LAjh)m  
  If ppx = p1x And ppy = p1y Then <</ Le%  
     point_in = True f<~S0[H  
     Exit Function *+'l|VaVq\  
  End If VYN1^Tp  
  If ppx = p2x And ppy = p2y Then &8wluOs/5  
     point_in = True n*fsdo~  
     Exit Function Gj([S17\0:  
  End If ;;l-E>X0  
   If ppx = p3x And ppy = p3y Then E#cZM>  
     point_in = True dy*CDRU4  
     Exit Function #EdsB  
  End If eMC0 )B  
     #>\+6W17U  
    aob = ff_angle(p1x, p1y, ppx, ppy, p2x, p2y) 0?nm`9v6  
    boc = ff_angle(p2x, p2y, ppx, ppy, p3x, p3y) -( ,iwFb  
    cod = ff_angle(p3x, p3y, ppx, ppy, p4x, p4y) ]):kMRv  
    doa = ff_angle(p4x, p4y, ppx, ppy, p1x, p1y) G_a//[p  
    sum = aob + boc + cod + doa {]\!vG6  
    If 360.01 > sum And sum > 359.99 Then C %o^
AR  
       point_in = True Tb6c]?'U  
    Else ~'l.g^p bv  
       point_in = False ?]L:j  
    End If 0if~qGm=!  
End Function

'得到点半径,得到交点坐标函数 ;tF7GjEp  
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() SrVJ Q~:>  
    '求得中心点坐标 3%W R  
Dim tt As String c*g(R.!  
Dim rt(3) As Single U\A*${  
    '判断是否平行 Lc<C1I 5=  
   acx = p3x - p1x E}$K&<J'-  
   acy = p3y - p1y 85fBKpEe  
   bdx = p4x - p2x `_;VD?")*l  
   bdy = p4y - p2y Wh)QCp0|n  
   If acx * bdy = acy * bdx Then _YH)E^If  
      rt(0) = 0 YrR}55V,  
      Exit Function m{bw(+r  
   Else b)A$lP%`  
      '判断斜率存在否 =kspHP<k  
      If p1x = p3x And p2x <> p4x Then AdtAc$@xK  
         tt = "ac_n_bd_y" 7='M&Za  
      ElseIf p1x <> p3x And p2x = p4x Then @Ooh}V#J  
         tt = "ac_y_bd_n" m*BtD-{  
      ElseIf p1x <> p3x And p2x <> p4x Then }>w;(R  
         tt = "ac_y_bd_y" *HwTq[y  
      End If q lL6wzq,  
    Select Case tt l\yFx  
         Case "ac_n_bd_y" #isBE}sT{  
            'bd线段方程 j!;?=s  
            k_bd = bdy / bdx .s_wP  
            b_bd = p2y - k_bd * p2x H!ZPP8]j>  
            p_x = p1x ?hS n)  
            p_y = k_bd * p_x + b_bd 3H%oTgWk  
         Case "ac_y_bd_n" g|PVOY+|^  
            'ac线段方程 7K`A2  
            k_ac = acy / acx 3`&2-  
            b_ac = p1y - k_ac * p1x 7 3k3(r
Z  
            p_x = p2x Aov=qLWJ  
            p_y = k_ac * p_x + b_ac -,~n|ceI  
        Case "ac_y_bd_y" DiAPs_@  
           'ac，bd线段都要求 )ll`F7B-  
           k_ac = acy / acx >Z?3dM~[  
           b_ac = p1y - k_ac * p1x J*8fGR%  
           k_bd = bdy / bdx /0 ,#c2aq  
           b_bd = p2y - k_bd * p2x ?R0sY ?u  
           p_x = -(b_bd - b_ac) / (k_bd - k_ac) M[0@3"}}  
           p_y = k_ac * p_x + b_ac aT#R#7<Eg  
        End Select H;<hmbN?d  
      rt(1) = p_x 'hL\xf{  
      rt(2) = p_y 6ZVJ2xs[%  
     +gTnq")wnI  
'计算最大半径 A8OV3h6]  
   rr1 = (p1x - p_x) * (p1x - p_x) + (p1y - p_y) * (p1y - p_y) #`/KF_a3\>  
   rr2 = (p2x - p_x) * (p2x - p_x) + (p2y - p_y) * (p2y - p_y) nVoPTr  
   rr3 = (p3x - p_x) * (p3x - p_x) + (p3y - p_y) * (p3y - p_y) zQ}:_
 
   rr4 = (p4x - p_x) * (p4x - p_x) + (p4y - p_y) * (p4y - p_y) {vAq08  
Dim bb(5) As Single @7%nMTZ@&v  
  bb(1) = rr1
ocy fU=}X  
  bb(2) = rr2 kzGD*  
  bb(3) = rr3 Nl7"|()e  
  bb(4) = rr4 >U9*  
  nb = rr1 pHY~_^B4&  
For i = 1 To 4 O'" &9  
    If nb <= bb(i) Then 8J%^gy>m]  
       nb = bb(i) 1P4jdp=~  
    End If V2%FWo|  
Next i :t]YPt
  
    rt(0) = Sqr(nb) <?,o {  
    rr = rt() &@A(8(%  
  End If 5 %q26&  
         }}Eko7'^  
End Function

高手啊.人才啊.

lifei0715:高手啊.人才啊. (2013-04-08 19:15)  > F&Wuf  

!uii|"  
有热压工艺方面的人才或者资料分享下； H*!j\|v0  
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 [2gK^o&t  

高手真多！

楼主威武霸气.