[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： '(C+qwdRv  
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关键点说几个： ZO/Jf Jn~  
1.区域是由点围成的，所以EXCEL中需要定义点的坐标（区域） 7FPSBvU#/  
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 /YUW)?o!^N  
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 QW,:'\G  

以下是几个重要的函数： zj] g
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1.判断点在区域中函数 w' J`$=  
2.计算夹角函数 $z*"@  
3.转置函数 d>mZY66P  
4.得到区域中心点，及区域半径函数 - EGZ  
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） J ;z
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6.文件开启与关闭，这个最常见了，就不说了

'计算夹角函数 CUG"2K9  
Function ff_angle(x1 As Single, y1 As Single, x2 As Single, y2 As Single, x3 As Single, y3 As Single) As Single tbR  
   cax = x2 - x1 F.a
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   cay = y2 - y1 1aIGC9xQ`  
   cbx = x2 - x3 t7u*j
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   cby = y2 - y3 &}Wi@;G]2
 
   mo_jj = cax * cbx + cay * cby r9N?z2X  
   mo_ca = Sqr(cax * cax + cay * cay) b(R.&X  
   mo_cb = Sqr(cbx * cbx + cby * cby) s+fxv(,"c  
   cos_acb = mo_jj / (mo_ca * mo_cb) CP;<B1  
   'ff_cos = cos_acb b/m.VL  
   If cos_acb >= 1 Then QgYt(/S  
   nn = 0 0{B<A^Bf  
   ElseIf cos_acb <= -1 Then :vEfJSA 1<  
   nn = 3.14159265258979 M[z1B!rT  
   Else !e<2o2~.  
   nn = Atn(-cos_acb / Sqr(-cos_acb * cos_acb + 1)) + 2 * Atn(1) 2*O#m  
   End If z&9MkbH1  
   'ff_angle = nn MK/8<i<.  
   ff_angle = nn * 180 / 3.14159265258979 N2}Y8aR~  
End Function

'判断点在区域内函数 <XDnAv0t  
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 _oG%bNM  
Dim aob, boc, cod, doa, sum As Single GT]>  
  If ppx = p1x And ppy = p1y Then pL[3,.@WA  
     point_in = True Hik=(pTu>  
     Exit Function  ~XWBLU<  
  End If @XtrC|dkkE  
  If ppx = p2x And ppy = p2y Then BxV>s+o&]  
     point_in = True ]9w8[T:O  
     Exit Function hO3 q|SL  
  End If ..nVViZ  
   If ppx = p3x And ppy = p3y Then XY? Cl  
     point_in = True 0L3
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     Exit Function wL:7G  
  End If O>nMeU  
     iJoY
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    aob = ff_angle(p1x, p1y, ppx, ppy, p2x, p2y) +L'Cbv="  
    boc = ff_angle(p2x, p2y, ppx, ppy, p3x, p3y) :tnW ivrwR  
    cod = ff_angle(p3x, p3y, ppx, ppy, p4x, p4y) xq,ql@7  
    doa = ff_angle(p4x, p4y, ppx, ppy, p1x, p1y) BGj!/E  
    sum = aob + boc + cod + doa V0 Z8VqV  
    If 360.01 > sum And sum > 359.99 Then =$y J66e  
       point_in = True O"o|8 l}M/  
    Else #*y.C[^5{  
       point_in = False 6m]?*k1HC  
    End If i4k [#x  
End Function

'得到点半径,得到交点坐标函数 I9xu3izAmR  
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() u$5.GmKm  
    '求得中心点坐标 C<9GdN  
Dim tt As String <{;'0> ToM  
Dim rt(3) As Single r9M3rj]  
    '判断是否平行 DxN\ H"  
   acx = p3x - p1x *$R9'Yo}F  
   acy = p3y - p1y hPG@iX|V  
   bdx = p4x - p2x o(?9vU  
   bdy = p4y - p2y [) >Yp-n  
   If acx * bdy = acy * bdx Then 8|\ -(:v  
      rt(0) = 0 G;wh).jG5  
      Exit Function ) ] Ro  
   Else s.;'-oA  
      '判断斜率存在否 :~W(#T,$E  
      If p1x = p3x And p2x <> p4x Then #Q["[}flVv  
         tt = "ac_n_bd_y" N\.g+ W  
      ElseIf p1x <> p3x And p2x = p4x Then XA>uCJf  
         tt = "ac_y_bd_n" KTmwkZcfYD  
      ElseIf p1x <> p3x And p2x <> p4x Then U
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         tt = "ac_y_bd_y" . bUmT!  
      End If lg )xQV  
    Select Case tt ~(tt.l#  
         Case "ac_n_bd_y" 2g5 4<G*e  
            'bd线段方程 8q6Le{G  
            k_bd = bdy / bdx ,+h<qBsV@  
            b_bd = p2y - k_bd * p2x I H#CaD  
            p_x = p1x v)|a}5={  
            p_y = k_bd * p_x + b_bd | ~>7_:  
         Case "ac_y_bd_n" 3"my!}03  
            'ac线段方程 OKau3T]  
            k_ac = acy / acx :?z@T[-  
            b_ac = p1y - k_ac * p1x vNd
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            p_x = p2x =Xid"$  
            p_y = k_ac * p_x + b_ac 9+<A7PM1
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        Case "ac_y_bd_y" Df2$2VU  
           'ac，bd线段都要求 W;!V_-:  
           k_ac = acy / acx iKaS7lWH  
           b_ac = p1y - k_ac * p1x 3rN}iSF^  
           k_bd = bdy / bdx @sZ' --Y  
           b_bd = p2y - k_bd * p2x v;?W|kJ.u  
           p_x = -(b_bd - b_ac) / (k_bd - k_ac) `\ IaeMvo  
           p_y = k_ac * p_x + b_ac 7tJ#0to  
        End Select =I&BO[d  
      rt(1) = p_x %$)Sz[=  
      rt(2) = p_y }c=Y<Cdh  
     *'M+oi  
'计算最大半径 J%q)6&  
   rr1 = (p1x - p_x) * (p1x - p_x) + (p1y - p_y) * (p1y - p_y) Mkt_pr  
   rr2 = (p2x - p_x) * (p2x - p_x) + (p2y - p_y) * (p2y - p_y) Cl&)#  
   rr3 = (p3x - p_x) * (p3x - p_x) + (p3y - p_y) * (p3y - p_y) f0%'4t  
   rr4 = (p4x - p_x) * (p4x - p_x) + (p4y - p_y) * (p4y - p_y) #^|2PFh5  
Dim bb(5) As Single OU]"uV<(  
  bb(1) = rr1 vF@|cTRR)  
  bb(2) = rr2 g.;2N9  
  bb(3) = rr3 &ns??:\+T  
  bb(4) = rr4 N;}X$b5Y @  
  nb = rr1 >OjK0jiPf  
For i = 1 To 4 ?l @=}WN  
    If nb <= bb(i) Then zt|1tU:  
       nb = bb(i) yF|28KJ  
    End If r~,3  
Next i apM)$  
    rt(0) = Sqr(nb) :]8A;`G}  
    rr = rt() *N{k#d/  
  End If cL#zE  
         QiV
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End Function

高手啊.人才啊.

lifei0715:高手啊.人才啊. (2013-04-08 19:15)  {~Q
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bl|)/)6o  
有热压工艺方面的人才或者资料分享下； `yRt?UQRS  
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 mJVru0  

高手真多！

楼主威武霸气.