[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： 5X-cDY*|  
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关键点说几个： (a1s~  
1.区域是由点围成的，所以EXCEL中需要定义点的坐标（区域） y4Plm.  
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 nlK"2/W  
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 /'}O-h  

以下是几个重要的函数： p}}o#a~V),  
1.判断点在区域中函数 j
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2.计算夹角函数 y%\kgWV  
3.转置函数 Ah28D!Gor  
4.得到区域中心点，及区域半径函数 hn-9l1~!h  
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） 5B@+$D[0?3  
6.文件开启与关闭，这个最常见了，就不说了

'计算夹角函数 soXeHjNl  
Function ff_angle(x1 As Single, y1 As Single, x2 As Single, y2 As Single, x3 As Single, y3 As Single) As Single sC48o'8(  
   cax = x2 - x1 TB4|dj-%  
   cay = y2 - y1 CbA!  
   cbx = x2 - x3 {d(@o!;Fi  
   cby = y2 - y3 <MI>>$seiJ  
   mo_jj = cax * cbx + cay * cby iXMs*GcK  
   mo_ca = Sqr(cax * cax + cay * cay) u)MdFz  
   mo_cb = Sqr(cbx * cbx + cby * cby) KZ pqbI Z  
   cos_acb = mo_jj / (mo_ca * mo_cb) \SS1-UbL  
   'ff_cos = cos_acb ksT2_Ic  
   If cos_acb >= 1 Then B_anO{3$4  
   nn = 0 $uF}GP_)  
   ElseIf cos_acb <= -1 Then Z~ VOO7|m  
   nn = 3.14159265258979 k/?5Fs!#  
   Else gN Xg  
   nn = Atn(-cos_acb / Sqr(-cos_acb * cos_acb + 1)) + 2 * Atn(1) J84Q|E  
   End If dQQh$*IL?{  
   'ff_angle = nn /Zap'S/  
   ff_angle = nn * 180 / 3.14159265258979 (hS j4Cp  
End Function

'判断点在区域内函数 z;JyHC)  
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 qI"Xh" c?  
Dim aob, boc, cod, doa, sum As Single <spVUp  
  If ppx = p1x And ppy = p1y Then $DeHo"mg7m  
     point_in = True JwL}|o6  
     Exit Function `h}fS4CO  
  End If (B{`In8G>y  
  If ppx = p2x And ppy = p2y Then w5w
,jD[  
     point_in = True D]\of#%T  
     Exit Function ;fw}<M!6  
  End If (-viP  
   If ppx = p3x And ppy = p3y Then Kur3Gf X  
     point_in = True /]zn8d  
     Exit Function }lt5!u~}  
  End If "`qmeZ$rg  
     T^> ST  
    aob = ff_angle(p1x, p1y, ppx, ppy, p2x, p2y) Zvz Zs  
    boc = ff_angle(p2x, p2y, ppx, ppy, p3x, p3y) kVR_?ch{  
    cod = ff_angle(p3x, p3y, ppx, ppy, p4x, p4y) Ybo:2e  
    doa = ff_angle(p4x, p4y, ppx, ppy, p1x, p1y) hkB/ OJ  
    sum = aob + boc + cod + doa v1h\ 6r'  
    If 360.01 > sum And sum > 359.99 Then )voJq\Y)%  
       point_in = True Is1P,`*!  
    Else <ZO"0oz%  
       point_in = False /
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    End If *;cvG?V  
End Function

'得到点半径,得到交点坐标函数 s^f7w  
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() T_iX1blrgh  
    '求得中心点坐标 Buc{dcL/  
Dim tt As String F
M$$0}X  
Dim rt(3) As Single m1bkY#\ U|  
    '判断是否平行 NxY B)`~  
   acx = p3x - p1x W]Bc7JM]T+  
   acy = p3y - p1y 0V;9v  
   bdx = p4x - p2x [$\KS_,Mn  
   bdy = p4y - p2y WH|TdU$V  
   If acx * bdy = acy * bdx Then jW]Q-  
      rt(0) = 0 3dO~Na`S  
      Exit Function ;]v{3m  
   Else +4L]Z;k  
      '判断斜率存在否 0'wchy>  
      If p1x = p3x And p2x <> p4x Then mIW8K ):  
         tt = "ac_n_bd_y" |"]#jx*8KC  
      ElseIf p1x <> p3x And p2x = p4x Then F8xz^UQO  
         tt = "ac_y_bd_n" Hk&op P9)  
      ElseIf p1x <> p3x And p2x <> p4x Then n_~u!Ky_P  
         tt = "ac_y_bd_y" -gn!8G1  
      End If 74_':,u;]~  
    Select Case tt  4,g_$)  
         Case "ac_n_bd_y" _2Zc?*4  
            'bd线段方程 ]{Y7mpdB  
            k_bd = bdy / bdx ]@Z[/z%~04  
            b_bd = p2y - k_bd * p2x \/XU v(  
            p_x = p1x ":v^Y 9  
            p_y = k_bd * p_x + b_bd B*Z}=$1j  
         Case "ac_y_bd_n" ^8.s"4{  
            'ac线段方程 M!i["($_  
            k_ac = acy / acx xA
wP  
            b_ac = p1y - k_ac * p1x #W$6[#7=I  
            p_x = p2x G*s5GG@Z.  
            p_y = k_ac * p_x + b_ac y^0 mf|  
        Case "ac_y_bd_y" Xsk/U++  
           'ac，bd线段都要求 @`mr|-Rp@  
           k_ac = acy / acx d9iVuw0u<  
           b_ac = p1y - k_ac * p1x a``/x_EZMn  
           k_bd = bdy / bdx Y{KN:|i.!  
           b_bd = p2y - k_bd * p2x 8Y"R@'~  
           p_x = -(b_bd - b_ac) / (k_bd - k_ac) >//yvkZ9
,  
           p_y = k_ac * p_x + b_ac = }ELu@\V[  
        End Select -,186ZVZ  
      rt(1) = p_x G^ShN45  
      rt(2) = p_y \B4f5L8k  
     9y'To
JZ6  
'计算最大半径 ]qb>O:T  
   rr1 = (p1x - p_x) * (p1x - p_x) + (p1y - p_y) * (p1y - p_y) n\GN}?4  
   rr2 = (p2x - p_x) * (p2x - p_x) + (p2y - p_y) * (p2y - p_y) ^*G UcQ$  
   rr3 = (p3x - p_x) * (p3x - p_x) + (p3y - p_y) * (p3y - p_y) ?`= <*{_o  
   rr4 = (p4x - p_x) * (p4x - p_x) + (p4y - p_y) * (p4y - p_y) fJ GwT  
Dim bb(5) As Single /&N\#;kK?b  
  bb(1) = rr1 Ddh  
  bb(2) = rr2 I*z|_}$  
  bb(3) = rr3 ,UYe OM2Ao  
  bb(4) = rr4 f4O}WU}l{s  
  nb = rr1 5{gv\S1  
For i = 1 To 4 7aS%;EU  
    If nb <= bb(i) Then <<DPer2  
       nb = bb(i) BN&eU'Dl]  
    End If A(9$!%#+L  
Next i qP[_!C.  
    rt(0) = Sqr(nb) ZU$QwI8  
    rr = rt() ux8K$$$  
  End If :x,dYJm  
         eN'b"_D  
End Function

高手啊.人才啊.

lifei0715:高手啊.人才啊. (2013-04-08 19:15)  Oiw!d6"Ovq  

]E*xn  
有热压工艺方面的人才或者资料分享下； .B!L+M< [  
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 u$ vLwJ|o  

高手真多！

楼主威武霸气.