[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： (y%%6#bd  
c{^i$  
=rtS#u Y  

关键点说几个： ]jZiW1C*a  
1.区域是由点围成的，所以EXCEL中需要定义点的坐标（区域） 2f`WDL  
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 s*aH`M7^0  
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 kA;xAb+U3  

以下是几个重要的函数： IlcNT_ 5a8  
1.判断点在区域中函数 JRHf.?  
2.计算夹角函数 D?iy.Dg  
3.转置函数 [?Mc4uT{  
4.得到区域中心点，及区域半径函数 PN1(j|  
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） NvQY7C  
6.文件开启与关闭，这个最常见了，就不说了

'计算夹角函数 DQ}_9?3  
Function ff_angle(x1 As Single, y1 As Single, x2 As Single, y2 As Single, x3 As Single, y3 As Single) As Single 7xLo4  
   cax = x2 - x1 se<i5JsSV  
   cay = y2 - y1 l-DGy#h+z  
   cbx = x2 - x3 )ZS:gD  
   cby = y2 - y3 nu
\  
   mo_jj = cax * cbx + cay * cby &(5^vw<0  
   mo_ca = Sqr(cax * cax + cay * cay) |#DC.Ga!  
   mo_cb = Sqr(cbx * cbx + cby * cby) Y|hzF:ll  
   cos_acb = mo_jj / (mo_ca * mo_cb) 9f@#SB_H  
   'ff_cos = cos_acb ",M
K'\E  
   If cos_acb >= 1 Then +Fu@I{"A  
   nn = 0 S(g<<Te  
   ElseIf cos_acb <= -1 Then hN>('S-cq  
   nn = 3.14159265258979 H B::0l<  
   Else %f_)<NP9=
 
   nn = Atn(-cos_acb / Sqr(-cos_acb * cos_acb + 1)) + 2 * Atn(1) .fio<mqi  
   End If o1fyNzq<  
   'ff_angle = nn ?c|`R1D  
   ff_angle = nn * 180 / 3.14159265258979 
377j3dP  
End Function

'判断点在区域内函数 ,wry u|7"$  
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 ZaukMEq  
Dim aob, boc, cod, doa, sum As Single .d#G]8suF  
  If ppx = p1x And ppy = p1y Then C }h<ldlY  
     point_in = True [I+)Ak5  
     Exit Function !Zk%P  
  End If dVj'  
  If ppx = p2x And ppy = p2y Then 1cHSgpoJ  
     point_in = True zVc7q7E  
     Exit Function g6[/F-3Qlf  
  End If ZbZAx:L  
   If ppx = p3x And ppy = p3y Then 2;Y@3d:z  
     point_in = True aIn)']  
     Exit Function r|JiGj^om  
  End If Ab^>z  
     s60:0>  
    aob = ff_angle(p1x, p1y, ppx, ppy, p2x, p2y) 6]@|7|N>X  
    boc = ff_angle(p2x, p2y, ppx, ppy, p3x, p3y) *oX  
    cod = ff_angle(p3x, p3y, ppx, ppy, p4x, p4y) i#M a-0#  
    doa = ff_angle(p4x, p4y, ppx, ppy, p1x, p1y) :o.x=c B  
    sum = aob + boc + cod + doa 8ACYuN\  
    If 360.01 > sum And sum > 359.99 Then S,wj[;cv4  
       point_in = True QC\,  
    Else "a0u-}/D  
       point_in = False 7{kpx$:_  
    End If bgzT3KZ  
End Function

'得到点半径,得到交点坐标函数 L?D~~Jb  
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() 02J6Pn3  
    '求得中心点坐标 `%
mBu`A  
Dim tt As String ) v[Knp'  
Dim rt(3) As Single >jrz;r  
    '判断是否平行 :m)Rmwn_  
   acx = p3x - p1x V'.eesN  
   acy = p3y - p1y qV,
$bw  
   bdx = p4x - p2x D|Ihe%w-  
   bdy = p4y - p2y  'QekQ];  
   If acx * bdy = acy * bdx Then OB*Xb*HN  
      rt(0) = 0 c~pUhx1(  
      Exit Function 8x^H<y=O  
   Else LO$#DHPt  
      '判断斜率存在否 f_5R!;  
      If p1x = p3x And p2x <> p4x Then N?mY|x\}wK  
         tt = "ac_n_bd_y" 'Qs3  
      ElseIf p1x <> p3x And p2x = p4x Then D $CY:@  
         tt = "ac_y_bd_n" .2{C29g  
      ElseIf p1x <> p3x And p2x <> p4x Then Y9H *S*n  
         tt = "ac_y_bd_y" GdfKxSO  
      End If YnO1Lf@  
    Select Case tt |q!2i  
         Case "ac_n_bd_y" M#lVPXS  
            'bd线段方程 *p#YK|  
            k_bd = bdy / bdx G|P
IH#  
            b_bd = p2y - k_bd * p2x sNk>0 X[  
            p_x = p1x &PQ{e8w  
            p_y = k_bd * p_x + b_bd H:{(CY?t  
         Case "ac_y_bd_n" :DX/r  
            'ac线段方程 A]SB c2  
            k_ac = acy / acx ]N(zom_0d  
            b_ac = p1y - k_ac * p1x ">D(+ xr!)  
            p_x = p2x %dk$K!5D0  
            p_y = k_ac * p_x + b_ac *l?% o{  
        Case "ac_y_bd_y" [vjkU7;7A  
           'ac，bd线段都要求 e2hk  
           k_ac = acy / acx s<r.+zqW  
           b_ac = p1y - k_ac * p1x <T.3ZZ%  
           k_bd = bdy / bdx A^Hp#b@  
           b_bd = p2y - k_bd * p2x G`9F.T_Z^)  
           p_x = -(b_bd - b_ac) / (k_bd - k_ac) @qhg[= @  
           p_y = k_ac * p_x + b_ac 3d)+44G_)  
        End Select #u=O 5%.  
      rt(1) = p_x CQuvbAo  
      rt(2) = p_y -_4jJxh=OB  
     tSXjp  
'计算最大半径 piiQ  
   rr1 = (p1x - p_x) * (p1x - p_x) + (p1y - p_y) * (p1y - p_y) 1d@^,7MF-  
   rr2 = (p2x - p_x) * (p2x - p_x) + (p2y - p_y) * (p2y - p_y) k}0  
   rr3 = (p3x - p_x) * (p3x - p_x) + (p3y - p_y) * (p3y - p_y) wgR@M[]o;  
   rr4 = (p4x - p_x) * (p4x - p_x) + (p4y - p_y) * (p4y - p_y)  DIu72\  
Dim bb(5) As Single Mn\B\  
  bb(1) = rr1 @ H`QLm  
  bb(2) = rr2 dBq,O%$oq  
  bb(3) = rr3 WlLZtgq  
  bb(4) = rr4 Zn 5m.=z  
  nb = rr1 )J6b:W  
For i = 1 To 4 eg~^wi  
    If nb <= bb(i) Then ]zMBZs  
       nb = bb(i) JK8@J9(#  
    End If MVL
}[J  
Next i 3]]6z K^i  
    rt(0) = Sqr(nb) UCj#t!Mw  
    rr = rt() \utH*;J|x  
  End If k#r7&Y  
         p*&LEjaVM4  
End Function

高手啊.人才啊.

lifei0715:高手啊.人才啊. (2013-04-08 19:15)  F+^[8zK^  

t$D[,$G9  
有热压工艺方面的人才或者资料分享下； QncS&  
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 1fp&"K:yR  

高手真多！

楼主威武霸气.