[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： 0!c
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描述:请输入描述

图片:2.jpg

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关键点说几个： >4A~?=  
1.区域是由点围成的，所以EXCEL中需要定义点的坐标（区域） )19As8rL/o  
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
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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 vpy_piG|  

以下是几个重要的函数：
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1.判断点在区域中函数 JfmNI~%  
2.计算夹角函数 GbC-6.~  
3.转置函数 X]J]7\4tF\  
4.得到区域中心点，及区域半径函数 xS) njuq4  
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） -S]yXZ  
6.文件开启与关闭，这个最常见了，就不说了

'计算夹角函数 ~+1t3M e  
Function ff_angle(x1 As Single, y1 As Single, x2 As Single, y2 As Single, x3 As Single, y3 As Single) As Single 2\flTO2Ny  
   cax = x2 - x1 6&o9mc\I  
   cay = y2 - y1 3:Aw.-,i\  
   cbx = x2 - x3 =9UR~-`d\  
   cby = y2 - y3 J`U\3:b`SP  
   mo_jj = cax * cbx + cay * cby wN[mU  
   mo_ca = Sqr(cax * cax + cay * cay) bWN%dn$$M  
   mo_cb = Sqr(cbx * cbx + cby * cby) WPBn?vb0<  
   cos_acb = mo_jj / (mo_ca * mo_cb) En:.U9?X  
   'ff_cos = cos_acb s? /#8 `  
   If cos_acb >= 1 Then 2IgTB|2  
   nn = 0 RbUhLcG5  
   ElseIf cos_acb <= -1 Then 8}/v[8p  
   nn = 3.14159265258979 Wq_#46P-  
   Else vEJ2d&  
   nn = Atn(-cos_acb / Sqr(-cos_acb * cos_acb + 1)) + 2 * Atn(1) <}~`YU>=v  
   End If FgILQ"+  
   'ff_angle = nn p`// *gl  
   ff_angle = nn * 180 / 3.14159265258979 *B7+rd  
End Function

'判断点在区域内函数 |oq27*ix~m  
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 T+z]ztO  
Dim aob, boc, cod, doa, sum As Single YqsN#E3pf  
  If ppx = p1x And ppy = p1y Then ueO&%  
     point_in = True d52l)8  
     Exit Function }."3&u't  
  End If ?CB*MWjd  
  If ppx = p2x And ppy = p2y Then 7^|oO~x6  
     point_in = True acuch  
     Exit Function S<
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  End If q\Cg2[nn2  
   If ppx = p3x And ppy = p3y Then WvG0hts=[  
     point_in = True 8spoDb.S  
     Exit Function ;[%_sVIy  
  End If YQ}xr^VA  
     # Ny  
    aob = ff_angle(p1x, p1y, ppx, ppy, p2x, p2y) 7cx~?xk <m  
    boc = ff_angle(p2x, p2y, ppx, ppy, p3x, p3y) 6QsH?!bu  
    cod = ff_angle(p3x, p3y, ppx, ppy, p4x, p4y) Pl_4;q!$  
    doa = ff_angle(p4x, p4y, ppx, ppy, p1x, p1y) Qq;` 9-&j  
    sum = aob + boc + cod + doa TRwlUC3hQ  
    If 360.01 > sum And sum > 359.99 Then M17oAVN7D  
       point_in = True Z$R6'EUb1  
    Else NG-Wn+W@b  
       point_in = False ]3tg|?%B  
    End If .Ap-<FB  
End Function

'得到点半径,得到交点坐标函数 QjH;'OVt  
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() "dfq
  
    '求得中心点坐标 \F]X!#&+  
Dim tt As String pKDP1S#<  
Dim rt(3) As Single _EeH  
    '判断是否平行 '>[l1<d!G  
   acx = p3x - p1x ( zQ)EHRD  
   acy = p3y - p1y ~m^.&mv3/  
   bdx = p4x - p2x /(C?3}}L  
   bdy = p4y - p2y HRkO.230  
   If acx * bdy = acy * bdx Then 3R(GO.n=]  
      rt(0) = 0 K*;e>{p  
      Exit Function )i8Hdtn  
   Else ;xFx%^M}br  
      '判断斜率存在否 ;V(- ;O  
      If p1x = p3x And p2x <> p4x Then T^LpoN/T  
         tt = "ac_n_bd_y" X|+o4R?  
      ElseIf p1x <> p3x And p2x = p4x Then n< UuVu  
         tt = "ac_y_bd_n" p2T%Zl_  
      ElseIf p1x <> p3x And p2x <> p4x Then WP,Ll\K)7  
         tt = "ac_y_bd_y" s%h|>l[lKT  
      End If 5/j7C>  
    Select Case tt 4|Z;EAFx  
         Case "ac_n_bd_y" tpe:]T/xh  
            'bd线段方程 PW(4-H  
            k_bd = bdy / bdx pvL)BD  
            b_bd = p2y - k_bd * p2x f49pIcAq  
            p_x = p1x Jy&O4g/'5  
            p_y = k_bd * p_x + b_bd q$)$?"  
         Case "ac_y_bd_n" P" +!mSe^~  
            'ac线段方程 /DOV/>@5%  
            k_ac = acy / acx *Ag</g@ h  
            b_ac = p1y - k_ac * p1x .?7u'%6x?{  
            p_x = p2x ,|hM`<"?  
            p_y = k_ac * p_x + b_ac qfp,5@p  
        Case "ac_y_bd_y" ~jdvxoX-  
           'ac，bd线段都要求 _'9
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           k_ac = acy / acx i#/,Q1yEn  
           b_ac = p1y - k_ac * p1x <CrNDY  
           k_bd = bdy / bdx oej5bAi  
           b_bd = p2y - k_bd * p2x 0zrgK;9
 
           p_x = -(b_bd - b_ac) / (k_bd - k_ac) '6l4MR$j&m  
           p_y = k_ac * p_x + b_ac VC%{qal;q  
        End Select @Qw~z0PE<l  
      rt(1) = p_x C9^[A4O@X!  
      rt(2) = p_y 7_Yxz$m  
     t)|*-=  
'计算最大半径 E6"+\-e  
   rr1 = (p1x - p_x) * (p1x - p_x) + (p1y - p_y) * (p1y - p_y) "`P/j+-rt  
   rr2 = (p2x - p_x) * (p2x - p_x) + (p2y - p_y) * (p2y - p_y) hV5Aw;7C  
   rr3 = (p3x - p_x) * (p3x - p_x) + (p3y - p_y) * (p3y - p_y) r{y&}gA  
   rr4 = (p4x - p_x) * (p4x - p_x) + (p4y - p_y) * (p4y - p_y) N$1ZA)M  
Dim bb(5) As Single AF ,*bb  
  bb(1) = rr1 v+a$Xh3Y~  
  bb(2) = rr2 H4%2"w6|!  
  bb(3) = rr3 ~JjL411pG  
  bb(4) = rr4 5,/rh,?  
  nb = rr1 `Y HnL4  
For i = 1 To 4 NfG<!  
    If nb <= bb(i) Then cj ?aCVa  
       nb = bb(i) 12 y=Eh  
    End If ${(v Er#}k  
Next i Co|3k:I 8  
    rt(0) = Sqr(nb) USF9sF0l  
    rr = rt() @qP uYFnw  
  End If a?Q\nu1  
         }xZR`xP(  
End Function

高手啊.人才啊.

lifei0715:高手啊.人才啊. (2013-04-08 19:15)  ]et ]Vkg  

D_SXxP[! g  
有热压工艺方面的人才或者资料分享下； <QuIXA  
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 L/J1;  

高手真多！

楼主威武霸气.