[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： ZKTz ,  
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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： KB(8f*  
1.区域是由点围成的，所以EXCEL中需要定义点的坐标（区域） ,w4V?>l  
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 T+H!_ky`A  
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 >!1-lfa8
 

以下是几个重要的函数： u <v7;dF|s  
1.判断点在区域中函数 X2~!(WxU F  
2.计算夹角函数 6q.Uhe_B  
3.转置函数 _ *Pf  
4.得到区域中心点，及区域半径函数 i2SR{e8:GF  
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） <$Yd0hxjU  
6.文件开启与关闭，这个最常见了，就不说了

'计算夹角函数 Wt~BU.  
Function ff_angle(x1 As Single, y1 As Single, x2 As Single, y2 As Single, x3 As Single, y3 As Single) As Single 'YSHi\z ](  
   cax = x2 - x1 SSMHoJGm  
   cay = y2 - y1 /R wjCUf  
   cbx = x2 - x3 AFE~ v\Gz  
   cby = y2 - y3 LyFN.2q
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   mo_jj = cax * cbx + cay * cby 6?c7$Y  
   mo_ca = Sqr(cax * cax + cay * cay) 8&b,qQ~  
   mo_cb = Sqr(cbx * cbx + cby * cby) sdw(R#GE  
   cos_acb = mo_jj / (mo_ca * mo_cb) 9V*qQS5<p  
   'ff_cos = cos_acb yEE*B:  
   If cos_acb >= 1 Then )bscBj@  
   nn = 0 =U?dbSf1*  
   ElseIf cos_acb <= -1 Then M[,@{u/  
   nn = 3.14159265258979 -m~#Bq  
   Else onxLyx|A  
   nn = Atn(-cos_acb / Sqr(-cos_acb * cos_acb + 1)) + 2 * Atn(1) ge8ZsaiU  
   End If draN0vf  
   'ff_angle = nn "@2-Zdrr1<  
   ff_angle = nn * 180 / 3.14159265258979 2`=7_v  
End Function

'判断点在区域内函数 A6(/;+n  
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 m!HJj>GEo  
Dim aob, boc, cod, doa, sum As Single vUM4S26"NT  
  If ppx = p1x And ppy = p1y Then Wvf ^N(  
     point_in = True oYH-wQj  
     Exit Function y?4BqgB  
  End If 1yu4emye4  
  If ppx = p2x And ppy = p2y Then 7hPY_W y  
     point_in = True 3)ywX&4"L  
     Exit Function $-sHWYZ  
  End If +QJ#2~pE  
   If ppx = p3x And ppy = p3y Then H9e<v4c  
     point_in = True )\$|X}uny&  
     Exit Function Btcy)LRk  
  End If 8bld3p"^  
     rFL;'Cj@  
    aob = ff_angle(p1x, p1y, ppx, ppy, p2x, p2y) pFjK}JOF  
    boc = ff_angle(p2x, p2y, ppx, ppy, p3x, p3y) Er?&Y,o  
    cod = ff_angle(p3x, p3y, ppx, ppy, p4x, p4y) gRcQt:  
    doa = ff_angle(p4x, p4y, ppx, ppy, p1x, p1y) KPUV@eQ,  
    sum = aob + boc + cod + doa qlP
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    If 360.01 > sum And sum > 359.99 Then EXqE~afm2  
       point_in = True 3(80:@|  
    Else )lDD\J7  
       point_in = False {"KMs[M  
    End If Pe3o;mx  
End Function

'得到点半径,得到交点坐标函数 @`9]F7h5W  
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() mQ"-,mMI  
    '求得中心点坐标 V(!V_Ug9.  
Dim tt As String U|R_OLWAg  
Dim rt(3) As Single \:LW(&[!  
    '判断是否平行 BnF^u5kv%  
   acx = p3x - p1x &wDs6xq  
   acy = p3y - p1y X%x*
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   bdx = p4x - p2x g*+>H1}  
   bdy = p4y - p2y sc#qwQ#  
   If acx * bdy = acy * bdx Then 5*u+q2\F  
      rt(0) = 0 \1M4Dl5!  
      Exit Function QQc -Ya!v  
   Else W ]8QM1$  
      '判断斜率存在否 ('+d.F[109  
      If p1x = p3x And p2x <> p4x Then 44j*KsBf  
         tt = "ac_n_bd_y" &s>Jb?_5Mx  
      ElseIf p1x <> p3x And p2x = p4x Then M x"\5i  
         tt = "ac_y_bd_n" jq0O22 -R  
      ElseIf p1x <> p3x And p2x <> p4x Then }3WxZv]I}  
         tt = "ac_y_bd_y" Ar#(psU  
      End If +G>\-tjSD  
    Select Case tt "qy,*{~  
         Case "ac_n_bd_y" S~G]~gt  
            'bd线段方程 -"9  
            k_bd = bdy / bdx 4Ftu  
            b_bd = p2y - k_bd * p2x <<O$ G7c  
            p_x = p1x r
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            p_y = k_bd * p_x + b_bd '8kP.l  
         Case "ac_y_bd_n" C\hM =%  
            'ac线段方程 &_8947  
            k_ac = acy / acx 1s;Saq+  
            b_ac = p1y - k_ac * p1x j3ls3H&  
            p_x = p2x +:/%3}
`  
            p_y = k_ac * p_x + b_ac \cM2k-  
        Case "ac_y_bd_y" SUK?z!f<i  
           'ac，bd线段都要求 {?7Uj  
           k_ac = acy / acx %E;'ln4h&,  
           b_ac = p1y - k_ac * p1x YtLt*Ig%  
           k_bd = bdy / bdx M X]n&  
           b_bd = p2y - k_bd * p2x 9} .z;prz  
           p_x = -(b_bd - b_ac) / (k_bd - k_ac) P[fq8lDA  
           p_y = k_ac * p_x + b_ac *|HY>U.  
        End Select 4s oJ.j8  
      rt(1) = p_x J]r^W)O  
      rt(2) = p_y <(!:$  
     ql~J8G9  
'计算最大半径 +1!ia]  
   rr1 = (p1x - p_x) * (p1x - p_x) + (p1y - p_y) * (p1y - p_y) o^wqFX(Y  
   rr2 = (p2x - p_x) * (p2x - p_x) + (p2y - p_y) * (p2y - p_y) 2
MK-5Kg  
   rr3 = (p3x - p_x) * (p3x - p_x) + (p3y - p_y) * (p3y - p_y) p5*jz
Q  
   rr4 = (p4x - p_x) * (p4x - p_x) + (p4y - p_y) * (p4y - p_y) MLp9y#  
Dim bb(5) As Single WTiD[u  
  bb(1) = rr1 KqP#6^ _  
  bb(2) = rr2 9;If&uM  
  bb(3) = rr3 l;E(I_ i)  
  bb(4) = rr4 9W);rL|5  
  nb = rr1 -trkA'ewZ  
For i = 1 To 4 2st3  
    If nb <= bb(i) Then #4;wjcGWw  
       nb = bb(i) yaX iE_.  
    End If EKN~H$.  
Next i |k9 C/  
    rt(0) = Sqr(nb) =-Ck4e *T  
    rr = rt() tO&^>&;5  
  End If X5w$4Kj&4l  
         q1ma%
eiN  
End Function

高手啊.人才啊.

lifei0715:高手啊.人才啊. (2013-04-08 19:15)  l}M!8:UzU  

S
`Rs82>  
有热压工艺方面的人才或者资料分享下； ] @fk]]R  
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 )Xyn q(  

高手真多！

楼主威武霸气.