[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： a6vej  
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图片:2.jpg

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关键点说几个： 2iM}YCV  
1.区域是由点围成的，所以EXCEL中需要定义点的坐标（区域） (U#,;  
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 .*YF{!R`h  
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 wG MhKZE  

以下是几个重要的函数： '.z7)n  
1.判断点在区域中函数 %dnpO|L  
2.计算夹角函数 ]QR]#[Tn'  
3.转置函数 `},:dDHI  
4.得到区域中心点，及区域半径函数 {1Cnrjw  
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） *~ IHVU  
6.文件开启与关闭，这个最常见了，就不说了

'计算夹角函数 7r?,wM  
Function ff_angle(x1 As Single, y1 As Single, x2 As Single, y2 As Single, x3 As Single, y3 As Single) As Single %t,42jQ9  
   cax = x2 - x1 sryA(V  
   cay = y2 - y1 IY6Ll6OK  
   cbx = x2 - x3 B!J?,SB  
   cby = y2 - y3 }iDRlE,  
   mo_jj = cax * cbx + cay * cby Z?xaXFm_  
   mo_ca = Sqr(cax * cax + cay * cay) tH;9"z# ~  
   mo_cb = Sqr(cbx * cbx + cby * cby) Trh t2Iv  
   cos_acb = mo_jj / (mo_ca * mo_cb) 'fK=;mM  
   'ff_cos = cos_acb IWi0? V  
   If cos_acb >= 1 Then i_m&qy<v  
   nn = 0 r6\g#}  
   ElseIf cos_acb <= -1 Then R5QW4i9  
   nn = 3.14159265258979 2m*ugBO;  
   Else uq9mq"  
   nn = Atn(-cos_acb / Sqr(-cos_acb * cos_acb + 1)) + 2 * Atn(1) !NNPg?Y  
   End If 0^Ldw)C"  
   'ff_angle = nn EwG+' nlE  
   ff_angle = nn * 180 / 3.14159265258979 XsJ`x  
End Function

'判断点在区域内函数 1f^oW[w&  
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 } %0w25  
Dim aob, boc, cod, doa, sum As Single yg}L,JJU<  
  If ppx = p1x And ppy = p1y Then JfJ
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     point_in = True RgFpc*.T  
     Exit Function YdvXp/P:|  
  End If "Ke_dM  
  If ppx = p2x And ppy = p2y Then (:~_#BA  
     point_in = True zQ<&[Tuwa  
     Exit Function u*iqwm.  
  End If H4v%$R;K  
   If ppx = p3x And ppy = p3y Then sR PQr?  
     point_in = True Rq(+zL(f  
     Exit Function BSy4 d>  
  End If N0lFx?4  
     0|va}m`<3G  
    aob = ff_angle(p1x, p1y, ppx, ppy, p2x, p2y)
}T902RL0  
    boc = ff_angle(p2x, p2y, ppx, ppy, p3x, p3y) G2[2y-Rv  
    cod = ff_angle(p3x, p3y, ppx, ppy, p4x, p4y) ^+~$eg&js  
    doa = ff_angle(p4x, p4y, ppx, ppy, p1x, p1y) W{ozZuo  
    sum = aob + boc + cod + doa ~O./A-l  
    If 360.01 > sum And sum > 359.99 Then aAoAjVNkK  
       point_in = True WR.7%U';  
    Else {3vm]  
       point_in = False UlN}SddI9  
    End If p(4Ek"  
End Function

'得到点半径,得到交点坐标函数 E.VEW;=  
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() 3joMtRB>;  
    '求得中心点坐标 Z-U3TrSI  
Dim tt As String d9D*w/clMi  
Dim rt(3) As Single #lVSQZO~a  
    '判断是否平行 $[=`*m  
   acx = p3x - p1x DML0paOm5  
   acy = p3y - p1y y;9K
 
   bdx = p4x - p2x !})3Fb  
   bdy = p4y - p2y lgAE`Os  
   If acx * bdy = acy * bdx Then Ke&
fTK  
      rt(0) = 0 d<;XQ.Wo7  
      Exit Function A,ao2)  
   Else }>j1j^c1='  
      '判断斜率存在否 zgpPu4t  
      If p1x = p3x And p2x <> p4x Then ]}0+7Q  
         tt = "ac_n_bd_y" JY>I  
      ElseIf p1x <> p3x And p2x = p4x Then 'Uo:b
<  
         tt = "ac_y_bd_n" t;ga>^NA"  
      ElseIf p1x <> p3x And p2x <> p4x Then eP3 itrH(  
         tt = "ac_y_bd_y" \=~<I  
      End If CV7.hF<  
    Select Case tt L/cbq*L  
         Case "ac_n_bd_y" )=D9L  
            'bd线段方程 aR;Q^YJ+a  
            k_bd = bdy / bdx }@A~a`9g  
            b_bd = p2y - k_bd * p2x Y.Ew;\6U  
            p_x = p1x Un[#zh<4  
            p_y = k_bd * p_x + b_bd G}~b  
         Case "ac_y_bd_n" %nc+VL4  
            'ac线段方程 (C QgT3V  
            k_ac = acy / acx z#*GPA8Em:  
            b_ac = p1y - k_ac * p1x ae1fCw3k  
            p_x = p2x ~JT{!wcE}o  
            p_y = k_ac * p_x + b_ac 
~GY;{  
        Case "ac_y_bd_y" J5rR?[i{  
           'ac，bd线段都要求 Kd,m;S\  
           k_ac = acy / acx 2W~2Hk=0+%  
           b_ac = p1y - k_ac * p1x 'XQv>J  
           k_bd = bdy / bdx khu,P[3>  
           b_bd = p2y - k_bd * p2x Qg oXOVo6  
           p_x = -(b_bd - b_ac) / (k_bd - k_ac) qx? lCz a"  
           p_y = k_ac * p_x + b_ac aA yFu
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        End Select >"nk}@  
      rt(1) = p_x ;NPb  
      rt(2) = p_y ,>jm|BTD {  
     C,z]q$4  
'计算最大半径 W]*wxzf!5z  
   rr1 = (p1x - p_x) * (p1x - p_x) + (p1y - p_y) * (p1y - p_y) K|1^?#n  
   rr2 = (p2x - p_x) * (p2x - p_x) + (p2y - p_y) * (p2y - p_y) F;NZJEy  
   rr3 = (p3x - p_x) * (p3x - p_x) + (p3y - p_y) * (p3y - p_y) YvHn~gNPhs  
   rr4 = (p4x - p_x) * (p4x - p_x) + (p4y - p_y) * (p4y - p_y) SO&;]YO  
Dim bb(5) As Single b
o"I:)n;  
  bb(1) = rr1 Ua3ERBX{  
  bb(2) = rr2 "7 4L  
  bb(3) = rr3 p_(hM&>C  
  bb(4) = rr4 ?^+|V,<
 
  nb = rr1 BPOWo8TqD^  
For i = 1 To 4 4* hmeS"  
    If nb <= bb(i) Then \%^3Izsc  
       nb = bb(i) q.X-2jjpx:  
    End If ";.
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Next i C]XD
Dr  
    rt(0) = Sqr(nb) 5LK>n-  
    rr = rt() ~5#7i_%@E}  
  End If V)Xcn'h  
         .lnD]Q  
End Function

高手啊.人才啊.

lifei0715:高手啊.人才啊. (2013-04-08 19:15)  =.c"&,c?L  

I .ty-X]  
有热压工艺方面的人才或者资料分享下； 'Ap5
Aq  
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 A@OV!DJe]  

高手真多！

楼主威武霸气.