[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： GMZj@q  
%0PZZl5b  

描述:请输入描述

图片:2.jpg

^%v<I"<Uq5  

关键点说几个： `j59MSuK  
1.区域是由点围成的，所以EXCEL中需要定义点的坐标（区域） :;u~M(R  
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 '\:?FQ C  
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 P]Z}% 8^O  

以下是几个重要的函数： Llf>C,)  
1.判断点在区域中函数 V#W(c_g
 
2.计算夹角函数 ,\5]n&T;r  
3.转置函数 l_LfVON  
4.得到区域中心点，及区域半径函数 #(@dN+  
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） T7YzO,b/   
6.文件开启与关闭，这个最常见了，就不说了

'计算夹角函数 ~
s{$&N  
Function ff_angle(x1 As Single, y1 As Single, x2 As Single, y2 As Single, x3 As Single, y3 As Single) As Single MQ"<r,o?:  
   cax = x2 - x1 SZc6=^$  
   cay = y2 - y1 #hzs,tvvD  
   cbx = x2 - x3 P/t$xqAL  
   cby = y2 - y3 qO>BF/)a(  
   mo_jj = cax * cbx + cay * cby W"|89\p}  
   mo_ca = Sqr(cax * cax + cay * cay) <4*7HY[  
   mo_cb = Sqr(cbx * cbx + cby * cby) =#1iio&  
   cos_acb = mo_jj / (mo_ca * mo_cb) #(CI/7 -  
   'ff_cos = cos_acb 8Md*9E#J("  
   If cos_acb >= 1 Then hdN3r{  
   nn = 0 \C*?a0!:Z}  
   ElseIf cos_acb <= -1 Then e&F,z=XJ}  
   nn = 3.14159265258979 U,Z.MPQ  
   Else H"I|dK:  
   nn = Atn(-cos_acb / Sqr(-cos_acb * cos_acb + 1)) + 2 * Atn(1) g9I2SdaJ  
   End If Czb@:l%sc  
   'ff_angle = nn z-(dT  
   ff_angle = nn * 180 / 3.14159265258979 Z/hSH 0(~  
End Function

'判断点在区域内函数 kYxn5+~  
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 -YHlVz  
Dim aob, boc, cod, doa, sum As Single sP5PYNspA  
  If ppx = p1x And ppy = p1y Then }RDhI1x[mk  
     point_in = True |;{wy  
     Exit Function &{y-}[~  
  End If kHX- AsRc  
  If ppx = p2x And ppy = p2y Then X,x{!  
     point_in = True tB}&-U|t[~  
     Exit Function v8 ggPI  
  End If "z< =S  
   If ppx = p3x And ppy = p3y Then v2JC{XqrI  
     point_in = True 04:^<n+{  
     Exit Function .0.Ha}{6b  
  End If z9&$Xao  
     \|DcWH1  
    aob = ff_angle(p1x, p1y, ppx, ppy, p2x, p2y) D19uI&U4  
    boc = ff_angle(p2x, p2y, ppx, ppy, p3x, p3y) j3IxcG}f  
    cod = ff_angle(p3x, p3y, ppx, ppy, p4x, p4y) o*I=6`j  
    doa = ff_angle(p4x, p4y, ppx, ppy, p1x, p1y) Q>JJI:uC4  
    sum = aob + boc + cod + doa v~ZdMQvwt  
    If 360.01 > sum And sum > 359.99 Then ?8b?{`@V  
       point_in = True vy1:>N?#5  
    Else DDc?GY:
 
       point_in = False =<iK3bPkU  
    End If @\z2FJ79w  
End Function

'得到点半径,得到交点坐标函数 >q[(UV  
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() vv"_u=H  
    '求得中心点坐标 rrwBsa3  
Dim tt As String ^4_.5~(  
Dim rt(3) As Single ygWo9?  
    '判断是否平行 2^E.sf$f  
   acx = p3x - p1x NK$k9,  
   acy = p3y - p1y a
5:YP  
   bdx = p4x - p2x U<KvKg  
   bdy = p4y - p2y >j|.pi  
   If acx * bdy = acy * bdx Then bQrH8)  
      rt(0) = 0 b Zn:q[7  
      Exit Function ,L6d~>=41  
   Else 4!XB?-.  
      '判断斜率存在否 !WR(H&uBr\  
      If p1x = p3x And p2x <> p4x Then iLws;3UX;x  
         tt = "ac_n_bd_y" 506B=  
      ElseIf p1x <> p3x And p2x = p4x Then k*w]a  
         tt = "ac_y_bd_n" ,<d[5;7x  
      ElseIf p1x <> p3x And p2x <> p4x Then =^|^"
b  
         tt = "ac_y_bd_y" w\:-lXw  
      End If bT|a]b:  
    Select Case tt 8G6PcTqv"  
         Case "ac_n_bd_y" %kxq"=3  
            'bd线段方程 *[wy- fu  
            k_bd = bdy / bdx (I IPrW;>  
            b_bd = p2y - k_bd * p2x w9SPkPkYE  
            p_x = p1x .a8N
5{`  
            p_y = k_bd * p_x + b_bd <_dyUiT$J  
         Case "ac_y_bd_n" {W)Kz_  
            'ac线段方程 (vB ae
m9  
            k_ac = acy / acx ~>VEg3#F  
            b_ac = p1y - k_ac * p1x M$B
9?N6  
            p_x = p2x 1y2D]h/'  
            p_y = k_ac * p_x + b_ac _[<R<&jG  
        Case "ac_y_bd_y" j#f+0  
           'ac，bd线段都要求 w-C~ Ik  
           k_ac = acy / acx j\B]>PP5  
           b_ac = p1y - k_ac * p1x zcF~6-aQ  
           k_bd = bdy / bdx o8-BTq8  
           b_bd = p2y - k_bd * p2x r/$+'~apTk  
           p_x = -(b_bd - b_ac) / (k_bd - k_ac) 9TIyY`2!  
           p_y = k_ac * p_x + b_ac 6iVjAxR  
        End Select .{1G"(z  
      rt(1) = p_x !hrXud=#"  
      rt(2) = p_y &=Gz[1 L  
     WS/^WxRY  
'计算最大半径 GpMKOjVm|  
   rr1 = (p1x - p_x) * (p1x - p_x) + (p1y - p_y) * (p1y - p_y) J*o:RnB  
   rr2 = (p2x - p_x) * (p2x - p_x) + (p2y - p_y) * (p2y - p_y) OL4I}^*,  
   rr3 = (p3x - p_x) * (p3x - p_x) + (p3y - p_y) * (p3y - p_y) +dX1`%RR[  
   rr4 = (p4x - p_x) * (p4x - p_x) + (p4y - p_y) * (p4y - p_y) ZR.1SA0x?O  
Dim bb(5) As Single Sf);j0G,D  
  bb(1) = rr1 jL(=<R(~y  
  bb(2) = rr2 |NJe4lw+?  
  bb(3) = rr3 SpPG  
  bb(4) = rr4 >@KQ )p' `  
  nb = rr1 ^1s!OT Is  
For i = 1 To 4 1+~JGY#   
    If nb <= bb(i) Then bY|%ois4  
       nb = bb(i) WPygmti}Be  
    End If ,d(F|5M:  
Next i (~:k70V5  
    rt(0) = Sqr(nb) rlT[tOVAY  
    rr = rt() l=8)_z;~D  
  End If "u~l+aW0  
         QZB2yK3]h  
End Function

高手啊.人才啊.

lifei0715:高手啊.人才啊. (2013-04-08 19:15)  .NcoST9a  

r`XIn#o  
有热压工艺方面的人才或者资料分享下； qH!}oPeU'  
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 `fh^[Q|4n0  

高手真多！

楼主威武霸气.