[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： o.KE=zp&z  
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图片:2.jpg

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关键点说几个： k|[86<&[  
1.区域是由点围成的，所以EXCEL中需要定义点的坐标（区域） lehuJgz'OO  
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 nTxN>?l2E  
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 ]{PJ  

以下是几个重要的函数： V( SRw  
1.判断点在区域中函数 K:8. Dvn  
2.计算夹角函数 t[Ywp!y[  
3.转置函数 <-Q0s%mNj,  
4.得到区域中心点，及区域半径函数 UA}N  
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） EK<ly"S.  
6.文件开启与关闭，这个最常见了，就不说了

'计算夹角函数 !=rJ~s F/{  
Function ff_angle(x1 As Single, y1 As Single, x2 As Single, y2 As Single, x3 As Single, y3 As Single) As Single +DA,|~k_  
   cax = x2 - x1 qASV\ <n  
   cay = y2 - y1 Q9NKQuSu  
   cbx = x2 - x3 Xwt}WSdF`k  
   cby = y2 - y3 ZIikDih1  
   mo_jj = cax * cbx + cay * cby +o^sm'$  
   mo_ca = Sqr(cax * cax + cay * cay) ;J&9l >  
   mo_cb = Sqr(cbx * cbx + cby * cby) Nvj0MD{ X  
   cos_acb = mo_jj / (mo_ca * mo_cb) _&|<(m&."  
   'ff_cos = cos_acb ;iTZzmB  
   If cos_acb >= 1 Then {;E]
#=|  
   nn = 0 G "`t$=0  
   ElseIf cos_acb <= -1 Then 5;Q9Z1 `  
   nn = 3.14159265258979 NB?y/v  
   Else <n{-&;>  
   nn = Atn(-cos_acb / Sqr(-cos_acb * cos_acb + 1)) + 2 * Atn(1) Rg6/6/ IN  
   End If ~e#QAaXD#5  
   'ff_angle = nn tB==v{t  
   ff_angle = nn * 180 / 3.14159265258979 (YKkJ  
End Function

'判断点在区域内函数 {&d )O  
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 (4oO8aBB  
Dim aob, boc, cod, doa, sum As Single VSW"/{Lp  
  If ppx = p1x And ppy = p1y Then L+J)  
     point_in = True K6M_b?XekA  
     Exit Function vD'YLn%Q  
  End If n06Jg+  
  If ppx = p2x And ppy = p2y Then 9 Z79  
     point_in = True N,~"8YSo  
     Exit Function
}hA h'*(  
  End If UcxMA%Pw7$  
   If ppx = p3x And ppy = p3y Then 5BsfbLKC  
     point_in = True 85 <%L:EC  
     Exit Function unN=yeut  
  End If +#MQ8d  
     T }^2IJ]  
    aob = ff_angle(p1x, p1y, ppx, ppy, p2x, p2y) S1G3xY$0  
    boc = ff_angle(p2x, p2y, ppx, ppy, p3x, p3y) 6*tbil_G+  
    cod = ff_angle(p3x, p3y, ppx, ppy, p4x, p4y) &L`yX/N2  
    doa = ff_angle(p4x, p4y, ppx, ppy, p1x, p1y) mH)th7  
    sum = aob + boc + cod + doa KmE<+/x~?  
    If 360.01 > sum And sum > 359.99 Then =VOl *  
       point_in = True sad[(|  
    Else 4oywP^
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       point_in = False gi5Ffvs$  
    End If Z&j?@k,k  
End Function

'得到点半径,得到交点坐标函数 z}f;_NX  
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() |cd=7[B  
    '求得中心点坐标 >$dkA\&p  
Dim tt As String StWF66u34&  
Dim rt(3) As Single :dkBr@u96O  
    '判断是否平行 %2t#>}If!  
   acx = p3x - p1x g"o),$tm  
   acy = p3y - p1y 3&ES?
MyB#  
   bdx = p4x - p2x Ad]oM]  
   bdy = p4y - p2y SdOE^_@:  
   If acx * bdy = acy * bdx Then *Qe{CE  
      rt(0) = 0 >W7IWhm3  
      Exit Function -y5Zc?e  
   Else `UH 1B/  
      '判断斜率存在否 >HlQ+bl$xw  
      If p1x = p3x And p2x <> p4x Then
n^7m^1to  
         tt = "ac_n_bd_y" N>3X!K  
      ElseIf p1x <> p3x And p2x = p4x Then .?CumaU  
         tt = "ac_y_bd_n" @!zT+W&
 
      ElseIf p1x <> p3x And p2x <> p4x Then %zA$+eT  
         tt = "ac_y_bd_y" 1ps_zn(  
      End If z~+gche>  
    Select Case tt sg!*%*XQ  
         Case "ac_n_bd_y" 8`S6BkfC|  
            'bd线段方程 V- HO_GDo  
            k_bd = bdy / bdx 'YUx&FcM  
            b_bd = p2y - k_bd * p2x jt
Fet{  
            p_x = p1x $bv l.c  
            p_y = k_bd * p_x + b_bd  e+=IGYC  
         Case "ac_y_bd_n" [J6b5  
            'ac线段方程 zA?]AL(+YW  
            k_ac = acy / acx l5bd);Ltq  
            b_ac = p1y - k_ac * p1x YMEI J}  
            p_x = p2x #m<<]L(o8W  
            p_y = k_ac * p_x + b_ac 6a\YD{D] _  
        Case "ac_y_bd_y" ZFsJeF'"  
           'ac，bd线段都要求 GY;q0oQ,  
           k_ac = acy / acx KB^i=+xr  
           b_ac = p1y - k_ac * p1x |L"!^Y#=D  
           k_bd = bdy / bdx K9+C3"*I  
           b_bd = p2y - k_bd * p2x ;\gsd'i  
           p_x = -(b_bd - b_ac) / (k_bd - k_ac) G B&+EZ  
           p_y = k_ac * p_x + b_ac ={a_?l%  
        End Select "TgE@bC  
      rt(1) = p_x o)hQ]d  
      rt(2) = p_y dfoFs&CSKh  
     sXaIQhZ  
'计算最大半径 |vY0[#E8&  
   rr1 = (p1x - p_x) * (p1x - p_x) + (p1y - p_y) * (p1y - p_y) U|HF;L  
   rr2 = (p2x - p_x) * (p2x - p_x) + (p2y - p_y) * (p2y - p_y) fsDwfwil*  
   rr3 = (p3x - p_x) * (p3x - p_x) + (p3y - p_y) * (p3y - p_y) |,wp@)e6h  
   rr4 = (p4x - p_x) * (p4x - p_x) + (p4y - p_y) * (p4y - p_y) E-_Q3^
  
Dim bb(5) As Single h&4f9HhS=  
  bb(1) = rr1 c#6g[TE@  
  bb(2) = rr2 L9=D,C~  
  bb(3) = rr3 ~<, QxFG5  
  bb(4) = rr4 URFp3qE  
  nb = rr1 Wqu][Wa[Z
 
For i = 1 To 4 NHCdf*  
    If nb <= bb(i) Then -^sbf.  
       nb = bb(i) =tv,B3Mo  
    End If Pkbx/\  
Next i 8,,$C7"EP  
    rt(0) = Sqr(nb) 8C{mV^cn~  
    rr = rt() DGwN*>X  
  End If u0@i3Po  
         6DFF:wrm&  
End Function

高手啊.人才啊.

lifei0715:高手啊.人才啊. (2013-04-08 19:15)  ~s@PP'!  

"<3F[[;~  
有热压工艺方面的人才或者资料分享下； "@1e0`n Q  
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 39p&M"Yo  

高手真多！

楼主威武霸气.