[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： >LR+dShG  
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图片:2.jpg

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关键点说几个：  _$4vk  
1.区域是由点围成的，所以EXCEL中需要定义点的坐标（区域） O7I|<H/gVE  
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 P1QGfp0-J  
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 PR1%  

以下是几个重要的函数： +2]{%=  
1.判断点在区域中函数 =u`^QE  
2.计算夹角函数 +EgQj*F*  
3.转置函数 .W%{j()op  
4.得到区域中心点，及区域半径函数 BI6o@d;=4  
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） =2[cpF]  
6.文件开启与关闭，这个最常见了，就不说了

'计算夹角函数 SNd]c  
Function ff_angle(x1 As Single, y1 As Single, x2 As Single, y2 As Single, x3 As Single, y3 As Single) As Single t=ry\h{Pc  
   cax = x2 - x1 !Hr +|HKQ?  
   cay = y2 - y1 X"{s"Mc0G  
   cbx = x2 - x3 T=2 91)@  
   cby = y2 - y3 R3$
eq )  
   mo_jj = cax * cbx + cay * cby =X2E
F  
   mo_ca = Sqr(cax * cax + cay * cay) ]7^YPFc+  
   mo_cb = Sqr(cbx * cbx + cby * cby) 2FS,B\d  
   cos_acb = mo_jj / (mo_ca * mo_cb) S<LHNZu|^A  
   'ff_cos = cos_acb ~Hs a6F&F  
   If cos_acb >= 1 Then 8P'>%G<m  
   nn = 0 =`
rESb[  
   ElseIf cos_acb <= -1 Then Aj4i}pT  
   nn = 3.14159265258979 _>*$%R  
   Else RxkcQL/Le  
   nn = Atn(-cos_acb / Sqr(-cos_acb * cos_acb + 1)) + 2 * Atn(1) 7
@Qz  
   End If fF8g3|p:  
   'ff_angle = nn eW+z@\d9Gz  
   ff_angle = nn * 180 / 3.14159265258979 0BIH.ZV#  
End Function

'判断点在区域内函数 g(MeCoCc  
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 y:Qo:Z~  
Dim aob, boc, cod, doa, sum As Single z.pP~he  
  If ppx = p1x And ppy = p1y Then \?)<==^  
     point_in = True [HK[{M=v=  
     Exit Function ;e_n7>'#%  
  End If h5ST`jZ  
  If ppx = p2x And ppy = p2y Then BxO8oKe  
     point_in = True hHdH#-O:4"  
     Exit Function 'zZN]P  
  End If #tdI;x3  
   If ppx = p3x And ppy = p3y Then Jpws1~  
     point_in = True _Y*]'?g`  
     Exit Function N/mTG2'<  
  End If c ++tk4  
     _w=si?q  
    aob = ff_angle(p1x, p1y, ppx, ppy, p2x, p2y) x2[A(O=  
    boc = ff_angle(p2x, p2y, ppx, ppy, p3x, p3y) a%sr*`  
    cod = ff_angle(p3x, p3y, ppx, ppy, p4x, p4y) W)?B{\  
    doa = ff_angle(p4x, p4y, ppx, ppy, p1x, p1y) aDTNr/I  
    sum = aob + boc + cod + doa /WB^h6qg  
    If 360.01 > sum And sum > 359.99 Then Ylll4w62N  
       point_in = True Lu6!W  
    Else S=ebht=  
       point_in = False a}+|2k_  
    End If F%t`dz!L  
End Function

'得到点半径,得到交点坐标函数 $3|++?  
Function rr(p1x As Single, p1y As Single, p2x As Single, p2y As Single, p3x As Single, p3y As Single, p4x As Single, p4y As Single) As Single() |#Bz&T  
    '求得中心点坐标 _K3?0<=4  
Dim tt As String t0d1??G  
Dim rt(3) As Single
^i2W=A'P  
    '判断是否平行 =U!M
,zw4  
   acx = p3x - p1x Zx7Y ,0  
   acy = p3y - p1y %vDN{%h8  
   bdx = p4x - p2x VlXUrJ9&  
   bdy = p4y - p2y oEd+  
   If acx * bdy = acy * bdx Then 9sifc<za  
      rt(0) = 0 (V)nHF*<>  
      Exit Function U@
!e&QPn  
   Else Ro`9Ibqr  
      '判断斜率存在否 \L-o>O  
      If p1x = p3x And p2x <> p4x Then <<
W{nSm#  
         tt = "ac_n_bd_y" ] hGU.C"(  
      ElseIf p1x <> p3x And p2x = p4x Then SZW`|ajH  
         tt = "ac_y_bd_n" p?2\9C4  
      ElseIf p1x <> p3x And p2x <> p4x Then Ly0^ L-~|  
         tt = "ac_y_bd_y" R$IxR=hMx  
      End If Ds? @LE|  
    Select Case tt fgK1+sW  
         Case "ac_n_bd_y" t23uQR#>b_  
            'bd线段方程 lO! Yl:;m%  
            k_bd = bdy / bdx F~2bCy[Z  
            b_bd = p2y - k_bd * p2x I{U7BZy  
            p_x = p1x A}v!vVg  
            p_y = k_bd * p_x + b_bd z'Atw"kA  
         Case "ac_y_bd_n" U}<5%"!;  
            'ac线段方程 _o/LFLq  
            k_ac = acy / acx HjAhz  
            b_ac = p1y - k_ac * p1x a,i k=g  
            p_x = p2x VPoA,;Y"-  
            p_y = k_ac * p_x + b_ac +sq'\Tbp  
        Case "ac_y_bd_y" 1t wC-rC  
           'ac，bd线段都要求 3oc p4x`[  
           k_ac = acy / acx e`9d&"  
           b_ac = p1y - k_ac * p1x k!l\|~  
           k_bd = bdy / bdx .R'<v^H  
           b_bd = p2y - k_bd * p2x CT,PQ  
           p_x = -(b_bd - b_ac) / (k_bd - k_ac) Oo^kV:.)  
           p_y = k_ac * p_x + b_ac 9+H C
!Uot  
        End Select P0VXHE1p  
      rt(1) = p_x /k8Lu+OJ  
      rt(2) = p_y #@FMH*?xX6  
     _ p%=RIR  
'计算最大半径 DSjEoWj   
   rr1 = (p1x - p_x) * (p1x - p_x) + (p1y - p_y) * (p1y - p_y) yuIy?K  
   rr2 = (p2x - p_x) * (p2x - p_x) + (p2y - p_y) * (p2y - p_y) {o1vv+i  
   rr3 = (p3x - p_x) * (p3x - p_x) + (p3y - p_y) * (p3y - p_y) dt&m YSZ}  
   rr4 = (p4x - p_x) * (p4x - p_x) + (p4y - p_y) * (p4y - p_y) WxLbf+0o  
Dim bb(5) As Single E/[>#%@i  
  bb(1) = rr1 O(x1Ja,&  
  bb(2) = rr2 1T&NU  
  bb(3) = rr3 C.qNBl*  
  bb(4) = rr4 'KvSI=$  
  nb = rr1 K#Ia19au5  
For i = 1 To 4 .n$c+{  
    If nb <= bb(i) Then 6S K;1Bp-{  
       nb = bb(i) U'~M(9uv:  
    End If O0^m_  
Next i FQY{[QvF~  
    rt(0) = Sqr(nb) >7g #e,d  
    rr = rt() e}lF#$  
  End If pm
d
a9V4  
         \LuaI  
End Function

高手啊.人才啊.

lifei0715:高手啊.人才啊. (2013-04-08 19:15)  |.OS7Gt?  

w-];!;%  
有热压工艺方面的人才或者资料分享下； -G[TlH06  
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 {3T&6LA  

高手真多！

楼主威武霸气.