[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： F-BJe]  
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关键点说几个： PUbaS{J7  
1.区域是由点围成的，所以EXCEL中需要定义点的坐标（区域） DE*MdfP0  
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 c%|vUAq*  
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 Dh2:2Rz=#7  

以下是几个重要的函数： DdBxqkh  
1.判断点在区域中函数 {mNdL J  
2.计算夹角函数 ; D1FAz  
3.转置函数 f#@S*^%V$  
4.得到区域中心点，及区域半径函数 h^}_YaT\  
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） /&CUspb  
6.文件开启与关闭，这个最常见了，就不说了

'计算夹角函数 vCj4;P g  
Function ff_angle(x1 As Single, y1 As Single, x2 As Single, y2 As Single, x3 As Single, y3 As Single) As Single Q/p(#/y#b  
   cax = x2 - x1 =M/qV  
   cay = y2 - y1 gWkjUz)  
   cbx = x2 - x3 ji}#MBac  
   cby = y2 - y3  L#n}e7Y9  
   mo_jj = cax * cbx + cay * cby +4Q[N;[+*  
   mo_ca = Sqr(cax * cax + cay * cay) *2`:VFEV  
   mo_cb = Sqr(cbx * cbx + cby * cby) Qh^R Ax  
   cos_acb = mo_jj / (mo_ca * mo_cb) zt?h^zf}  
   'ff_cos = cos_acb A^-iHm  
   If cos_acb >= 1 Then Yt{ji  
   nn = 0 h6g:(3t6m  
   ElseIf cos_acb <= -1 Then 6#E7!-u(-  
   nn = 3.14159265258979 ;d4y{  
   Else d<#p %$A4  
   nn = Atn(-cos_acb / Sqr(-cos_acb * cos_acb + 1)) + 2 * Atn(1) D3y>iQd
  
   End If z=qWJQ  
   'ff_angle = nn %VWp&a8  
   ff_angle = nn * 180 / 3.14159265258979 0 sZwdO  
End Function

'判断点在区域内函数 N`HSE=u>  
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 JA<~xo[Q9  
Dim aob, boc, cod, doa, sum As Single S;8.y
j-  
  If ppx = p1x And ppy = p1y Then ugI#ZFjJWE  
     point_in = True KSc~GP_  
     Exit Function ^sV|ck  
  End If zks#EzQ  
  If ppx = p2x And ppy = p2y Then .a:Z!KF  
     point_in = True M6_-f ;.  
     Exit Function ds]?;l"  
  End If 6 Uw;C84!  
   If ppx = p3x And ppy = p3y Then Aq"PG}Ic  
     point_in = True !lhFKb;  
     Exit Function ra]:$XJ5=a  
  End If V\AK6U@r^  
     >! oF0R_<  
    aob = ff_angle(p1x, p1y, ppx, ppy, p2x, p2y) l<xFnj  
    boc = ff_angle(p2x, p2y, ppx, ppy, p3x, p3y) K_>/lirE?  
    cod = ff_angle(p3x, p3y, ppx, ppy, p4x, p4y) 333u
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    doa = ff_angle(p4x, p4y, ppx, ppy, p1x, p1y) ,T$r9!WTM  
    sum = aob + boc + cod + doa 4\ FP  
    If 360.01 > sum And sum > 359.99 Then ;g9%&  
       point_in = True f&c]LH_  
    Else ~M*gsW$  
       point_in = False j&CZ=?K^c  
    End If C`0%C7  
End Function

'得到点半径,得到交点坐标函数  hgO?+x  
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() _CE9B e\  
    '求得中心点坐标 _2OuskL  
Dim tt As String ~^7r?<aKc  
Dim rt(3) As Single :B.G)M\  
    '判断是否平行 A"4@L*QV  
   acx = p3x - p1x k 4B_W  
   acy = p3y - p1y ~<,Sh~Ana.  
   bdx = p4x - p2x U5<@<j(@  
   bdy = p4y - p2y RZh}:  
   If acx * bdy = acy * bdx Then
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      rt(0) = 0 xNX'~B^4d  
      Exit Function fY_%33_I$  
   Else PN &|8_  
      '判断斜率存在否 2ykCtRe  
      If p1x = p3x And p2x <> p4x Then DA=1KaJ.  
         tt = "ac_n_bd_y" <hv7s,i  
      ElseIf p1x <> p3x And p2x = p4x Then bSrZ{l  
         tt = "ac_y_bd_n" "IwM:v  
      ElseIf p1x <> p3x And p2x <> p4x Then 2-mQt_ i  
         tt = "ac_y_bd_y" sPCMckt  
      End If _wh
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    Select Case tt T3z(k la  
         Case "ac_n_bd_y" J8;Okzb!L  
            'bd线段方程 [Oy >R  
            k_bd = bdy / bdx sRq U]i8l  
            b_bd = p2y - k_bd * p2x p{.8_#O%S  
            p_x = p1x k1fRj_@WPT  
            p_y = k_bd * p_x + b_bd 3cC }'j  
         Case "ac_y_bd_n" S}7>
RHe  
            'ac线段方程 "2;N2=~7  
            k_ac = acy / acx 3LW[H+k  
            b_ac = p1y - k_ac * p1x 2B` 8
eb  
            p_x = p2x *Jt8
  
            p_y = k_ac * p_x + b_ac <HQ&-jx  
        Case "ac_y_bd_y" hYb9`0G"2  
           'ac，bd线段都要求 IN^_BKQt  
           k_ac = acy / acx F=}
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           b_ac = p1y - k_ac * p1x |scUo~  
           k_bd = bdy / bdx nwf7M#3d  
           b_bd = p2y - k_bd * p2x {?i)K X^  
           p_x = -(b_bd - b_ac) / (k_bd - k_ac)
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           p_y = k_ac * p_x + b_ac D9-Lg%  
        End Select Km*<Kfcz  
      rt(1) = p_x cNj*E =~;  
      rt(2) = p_y &N\[V-GP2G  
     W-D[z#)/Y  
'计算最大半径 
O&'/J8  
   rr1 = (p1x - p_x) * (p1x - p_x) + (p1y - p_y) * (p1y - p_y) >IY,be6>P  
   rr2 = (p2x - p_x) * (p2x - p_x) + (p2y - p_y) * (p2y - p_y) w^o}E)O  
   rr3 = (p3x - p_x) * (p3x - p_x) + (p3y - p_y) * (p3y - p_y) GBbhar},g  
   rr4 = (p4x - p_x) * (p4x - p_x) + (p4y - p_y) * (p4y - p_y) !kXeO6X@m  
Dim bb(5) As Single %-j&e44  
  bb(1) = rr1 CgnXr/!L  
  bb(2) = rr2 8#59iQl  
  bb(3) = rr3 XnXb&@Y  
  bb(4) = rr4 Wsm`YLYkt!  
  nb = rr1 84
M3c  
For i = 1 To 4 %S#WPD'Y  
    If nb <= bb(i) Then (~()RkT  
       nb = bb(i) ~m`!;rE  
    End If >n!ni(  
Next i Np)aS[9W  
    rt(0) = Sqr(nb) f=I:DkR  
    rr = rt() nY^Nbh0  
  End If /cY^]VLe  
         {4rQ7J4Ux  
End Function

高手啊.人才啊.

lifei0715:高手啊.人才啊. (2013-04-08 19:15)  p\S8oHWe  

gpAHC   
有热压工艺方面的人才或者资料分享下； ( V4G<-jG  
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 SDc" 4g`
 

高手真多！

楼主威武霸气.