[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： uW#s;1H.)  
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S&]r6ss  

关键点说几个： *fv BB9raq  
1.区域是由点围成的，所以EXCEL中需要定义点的坐标（区域） .7LQ l?  
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 [UC_  
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 W+U0Y,N6  

以下是几个重要的函数： cZ)mp`^n7  
1.判断点在区域中函数 Kn=EDtg  
2.计算夹角函数 33D2^Sf6"  
3.转置函数 Q3^h  
4.得到区域中心点，及区域半径函数 S ~fz  
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） fc<y(uX  
6.文件开启与关闭，这个最常见了，就不说了

'计算夹角函数 HQ7g0:-^a>  
Function ff_angle(x1 As Single, y1 As Single, x2 As Single, y2 As Single, x3 As Single, y3 As Single) As Single xf,A<j(o  
   cax = x2 - x1 k0ai#3iJ  
   cay = y2 - y1 <Z.{q Zd  
   cbx = x2 - x3 b6Z3(!] ]  
   cby = y2 - y3 -LUZ7,!/>o  
   mo_jj = cax * cbx + cay * cby i$6rnS&C  
   mo_ca = Sqr(cax * cax + cay * cay) oA7DhU5n  
   mo_cb = Sqr(cbx * cbx + cby * cby) 1i~q~O,  
   cos_acb = mo_jj / (mo_ca * mo_cb) 
pOn&D  
   'ff_cos = cos_acb _Y]Oloo('  
   If cos_acb >= 1 Then B&B:P  
   nn = 0 ]adgOlM  
   ElseIf cos_acb <= -1 Then tvFe_*Ck  
   nn = 3.14159265258979 QKq4kAaJ!  
   Else /^k%sG@?  
   nn = Atn(-cos_acb / Sqr(-cos_acb * cos_acb + 1)) + 2 * Atn(1) 6_
u!{  
   End If _6r[msH"  
   'ff_angle = nn %g@\SR.  
   ff_angle = nn * 180 / 3.14159265258979 &p_iAMn:9  
End Function

'判断点在区域内函数 p_&B+ <z  
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 "T^%HPif  
Dim aob, boc, cod, doa, sum As Single K\;4;6g  
  If ppx = p1x And ppy = p1y Then Qb>("j~Z  
     point_in = True w6X:39d  
     Exit Function YsVKdh  
  End If XxdD)I  
  If ppx = p2x And ppy = p2y Then r*$f^T!|  
     point_in = True % 33O)<?  
     Exit Function G!I5Er0pdy  
  End If /j$pV  
   If ppx = p3x And ppy = p3y Then =P9rOK=  
     point_in = True ![r)KE=v8I  
     Exit Function y }R2ZO  
  End If 
wXqwb|2  
     <X4f2z{T{@  
    aob = ff_angle(p1x, p1y, ppx, ppy, p2x, p2y) K39I j_3  
    boc = ff_angle(p2x, p2y, ppx, ppy, p3x, p3y) Z]TQ+9t  
    cod = ff_angle(p3x, p3y, ppx, ppy, p4x, p4y) |;)_-
=L0P  
    doa = ff_angle(p4x, p4y, ppx, ppy, p1x, p1y) - ry  
    sum = aob + boc + cod + doa  WTl0}wi  
    If 360.01 > sum And sum > 359.99 Then fS|e{!iI"  
       point_in = True e],(d7Jo  
    Else MmvOyKNZF  
       point_in = False W% Lrp{  
    End If VWK/(>TP  
End Function

'得到点半径,得到交点坐标函数 !.O[@A\.-  
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() N2[jBy8M  
    '求得中心点坐标 y&8`NS#_p?  
Dim tt As String V/"RCqY4  
Dim rt(3) As Single eX"Ecl{  
    '判断是否平行 ELMz~vp  
   acx = p3x - p1x #`%S[)RT  
   acy = p3y - p1y S[
/udA  
   bdx = p4x - p2x .
a @7  
   bdy = p4y - p2y #Y-_kQV*  
   If acx * bdy = acy * bdx Then l?J[K  
      rt(0) = 0 DaHbOs_<  
      Exit Function S[
"r @<  
   Else V3VTbgF  
      '判断斜率存在否 ]|w~{X!b4  
      If p1x = p3x And p2x <> p4x Then p=x&X~  
         tt = "ac_n_bd_y" 6}c!>n['  
      ElseIf p1x <> p3x And p2x = p4x Then Nr,I`x\N
 
         tt = "ac_y_bd_n" upk_;ae  
      ElseIf p1x <> p3x And p2x <> p4x Then Yqo@ g2g  
         tt = "ac_y_bd_y" r]D>p&4  
      End If q^wSM  
    Select Case tt \vV]fX  
         Case "ac_n_bd_y" 9yTkZ`M28  
            'bd线段方程 3y2L!&'z  
            k_bd = bdy / bdx 0~WXA=XG  
            b_bd = p2y - k_bd * p2x BLqK5~  
            p_x = p1x iRG6Cw2  
            p_y = k_bd * p_x + b_bd d*k5h<jM
 
         Case "ac_y_bd_n" Tw`dLK?  
            'ac线段方程 1?8M31  
            k_ac = acy / acx '3Fb[md54  
            b_ac = p1y - k_ac * p1x #X$s5H  
            p_x = p2x p^ROt'eQ<  
            p_y = k_ac * p_x + b_ac ?^7X2 u$nm  
        Case "ac_y_bd_y" N z=P1&G'  
           'ac，bd线段都要求 46\!W(O~y  
           k_ac = acy / acx +C
SR!  
           b_ac = p1y - k_ac * p1x Ow5VBw(  
           k_bd = bdy / bdx @t$yg$Q?[  
           b_bd = p2y - k_bd * p2x zYdieE\-  
           p_x = -(b_bd - b_ac) / (k_bd - k_ac) !e |Bi{  
           p_y = k_ac * p_x + b_ac ,g"JgX  
        End Select V7gL*,3>=  
      rt(1) = p_x kqo4 v;r  
      rt(2) = p_y ze5#6Vzd&  
     a;~< iB;3"  
'计算最大半径 bi@'m?XwJ  
   rr1 = (p1x - p_x) * (p1x - p_x) + (p1y - p_y) * (p1y - p_y) ObreDv^,  
   rr2 = (p2x - p_x) * (p2x - p_x) + (p2y - p_y) * (p2y - p_y) |90/tNe  
   rr3 = (p3x - p_x) * (p3x - p_x) + (p3y - p_y) * (p3y - p_y) N,VI55J:y>  
   rr4 = (p4x - p_x) * (p4x - p_x) + (p4y - p_y) * (p4y - p_y) -Ks)1w>l
 
Dim bb(5) As Single upeioC q  
  bb(1) = rr1 +s`cXTlFrk  
  bb(2) = rr2 Rm$(X5x>o  
  bb(3) = rr3 5K$<Ad4$b  
  bb(4) = rr4 pg_H'0R  
  nb = rr1 r_tt~|s,>  
For i = 1 To 4 ==%5Ci7qMy  
    If nb <= bb(i) Then 2* TIr  
       nb = bb(i) mC0Dj O  
    End If THK^u+~LM  
Next i D97 vfC  
    rt(0) = Sqr(nb) &l_}yf"v  
    rr = rt() 0blbf@XA  
  End If ?pd/cj^  
         {:n1|_r4Z  
End Function

高手啊.人才啊.

lifei0715:高手啊.人才啊. (2013-04-08 19:15)  *0Fz." v  

've[Mx  
有热压工艺方面的人才或者资料分享下； AS;qJ)JfzQ  
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 V@O)7ND  

高手真多！

楼主威武霸气.