[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： R
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关键点说几个： &N9IcNP  
1.区域是由点围成的，所以EXCEL中需要定义点的坐标（区域） gWi{\x8dt  
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 ?~ ?Hdv  
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 pX^=be_  

以下是几个重要的函数： p>&S7M/9  
1.判断点在区域中函数 KD=bkZ&  
2.计算夹角函数 fzyzuS$  
3.转置函数 ]\`w1'*  
4.得到区域中心点，及区域半径函数 EP(Eq  
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） F0&O/-w&u  
6.文件开启与关闭，这个最常见了，就不说了

'计算夹角函数 ^9s"FdB]24  
Function ff_angle(x1 As Single, y1 As Single, x2 As Single, y2 As Single, x3 As Single, y3 As Single) As Single V>r j$Nc]  
   cax = x2 - x1 97(n\Wt2  
   cay = y2 - y1 }|,EU!nDi  
   cbx = x2 - x3 7g8B'ex J  
   cby = y2 - y3 {<r`5  
   mo_jj = cax * cbx + cay * cby /xJY7yF  
   mo_ca = Sqr(cax * cax + cay * cay) >R#9\/s  
   mo_cb = Sqr(cbx * cbx + cby * cby) %^T!@uZr  
   cos_acb = mo_jj / (mo_ca * mo_cb) <0>[c<{V<  
   'ff_cos = cos_acb BPqwDjW  
   If cos_acb >= 1 Then L*v93;|s  
   nn = 0 RRNH0-D1l  
   ElseIf cos_acb <= -1 Then |w4(rs-  
   nn = 3.14159265258979 u,\xok"  
   Else p[b7E`7  
   nn = Atn(-cos_acb / Sqr(-cos_acb * cos_acb + 1)) + 2 * Atn(1) -C=]n<ak  
   End If ;NBT 4  
   'ff_angle = nn OK.-]()!  
   ff_angle = nn * 180 / 3.14159265258979 l=,.iv=W  
End Function

'判断点在区域内函数 C9GU6Ao  
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 w9'H.Lq  
Dim aob, boc, cod, doa, sum As Single #.~.UHt  
  If ppx = p1x And ppy = p1y Then ipfm'aQ  
     point_in = True !\3}R25  
     Exit Function 'aNahzb  
  End If +A&EKk%$ |  
  If ppx = p2x And ppy = p2y Then ~T;K-9R  
     point_in = True ~>4@;  
     Exit Function .H
QVj'g  
  End If 1`nc8qC  
   If ppx = p3x And ppy = p3y Then g<0w/n!jmC  
     point_in = True Vvxa.B  
     Exit Function {jrZ?e-q  
  End If Hxj'38Y  
     7=L:m7T  
    aob = ff_angle(p1x, p1y, ppx, ppy, p2x, p2y) 5c*p2:]  
    boc = ff_angle(p2x, p2y, ppx, ppy, p3x, p3y) (R,NV3m?w  
    cod = ff_angle(p3x, p3y, ppx, ppy, p4x, p4y) &Jrq5Q C  
    doa = ff_angle(p4x, p4y, ppx, ppy, p1x, p1y) 3zk:59  
    sum = aob + boc + cod + doa XryQ)x(  
    If 360.01 > sum And sum > 359.99 Then fMgcK$  
       point_in = True dCW0^k  
    Else X S6]C{  
       point_in = False ](]*]a4ss  
    End If nomu$|I  
End Function

'得到点半径,得到交点坐标函数 ';i"?D?NAk  
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() m$j n5:  
    '求得中心点坐标 ^yzo!`)fso  
Dim tt As String =d:R/Z%,  
Dim rt(3) As Single ;9 =}_h)]  
    '判断是否平行 tf.q~@Pi  
   acx = p3x - p1x >#Grf)@"6  
   acy = p3y - p1y Ak<IHp^Q  
   bdx = p4x - p2x CpB
Q>!CW  
   bdy = p4y - p2y j+z'  
   If acx * bdy = acy * bdx Then @n5;|`)\  
      rt(0) = 0 ?Cc
R 7l  
      Exit Function &!H~bzg  
   Else ?,A}E|jZ  
      '判断斜率存在否 HV#?6,U}  
      If p1x = p3x And p2x <> p4x Then SSSDl$}'t  
         tt = "ac_n_bd_y" 6Cop#kW#  
      ElseIf p1x <> p3x And p2x = p4x Then zsR  wF  
         tt = "ac_y_bd_n" *l-Dh:  
      ElseIf p1x <> p3x And p2x <> p4x Then ,3fuX~g  
         tt = "ac_y_bd_y" 
B}l}Aq8  
      End If EF*oPn0|  
    Select Case tt "@UU[o  
         Case "ac_n_bd_y" GU;TK'Yy?  
            'bd线段方程 muqfSF  
            k_bd = bdy / bdx Wl9I`Itg  
            b_bd = p2y - k_bd * p2x LaEX kb*s  
            p_x = p1x R{2GQB  
            p_y = k_bd * p_x + b_bd |j.KFu845  
         Case "ac_y_bd_n" ,6cbD  
            'ac线段方程 F3H:I"4  
            k_ac = acy / acx rFt,36#  
            b_ac = p1y - k_ac * p1x 6T} CPDRq  
            p_x = p2x C+Fh$  
            p_y = k_ac * p_x + b_ac
Vsm%h^]d  
        Case "ac_y_bd_y" 5 b#" G"  
           'ac，bd线段都要求 2V=FWuXC"  
           k_ac = acy / acx \\E_W9.u  
           b_ac = p1y - k_ac * p1x )Rm 'YmO  
           k_bd = bdy / bdx 4N%2w(,+8  
           b_bd = p2y - k_bd * p2x \$$b",2 h  
           p_x = -(b_bd - b_ac) / (k_bd - k_ac) zBrWm_R5T  
           p_y = k_ac * p_x + b_ac Wf+Cc?/4  
        End Select vV&AG1_Mv  
      rt(1) = p_x TQbFI;\  
      rt(2) = p_y %$9)1"T0Y  
     -x3tx7%  
'计算最大半径 ECE{xoc  
   rr1 = (p1x - p_x) * (p1x - p_x) + (p1y - p_y) * (p1y - p_y) /v|68x6  
   rr2 = (p2x - p_x) * (p2x - p_x) + (p2y - p_y) * (p2y - p_y) tnKpn-LPA  
   rr3 = (p3x - p_x) * (p3x - p_x) + (p3y - p_y) * (p3y - p_y) l/y Kc8^<  
   rr4 = (p4x - p_x) * (p4x - p_x) + (p4y - p_y) * (p4y - p_y) F]dd>#  
Dim bb(5) As Single JQ{zWJlt  
  bb(1) = rr1 anKb
 
  bb(2) = rr2 edImrm1f  
  bb(3) = rr3 m_PrasZ>  
  bb(4) = rr4 YiQeI|{oN  
  nb = rr1 j4 &  
For i = 1 To 4 hsQrd%{f  
    If nb <= bb(i) Then %gne%9nn  
       nb = bb(i) _nIqy&<  
    End If U d=gdsL  
Next i .$ P2W0G  
    rt(0) = Sqr(nb) Ep,0Z*j  
    rr = rt() )2<B$p  
  End If J*q=C%}.
  
         [/fwt!  
End Function

高手啊.人才啊.

lifei0715:高手啊.人才啊. (2013-04-08 19:15)  {ZYCnS&?CL  

*Lk&@(  
有热压工艺方面的人才或者资料分享下； $bC!T  
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 C
5

z  

高手真多！

楼主威武霸气.