[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： `3oP^#  
?+=|{{l  

描述:请输入描述

图片:2.jpg

 F]#fl%  

关键点说几个： uI&M|u:nT  
1.区域是由点围成的，所以EXCEL中需要定义点的坐标（区域） !I_
4GE,  
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 8:fiO|~%  
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 V7_??L%Ct`  

以下是几个重要的函数： musxX58%  
1.判断点在区域中函数 `oBzt|f5  
2.计算夹角函数 O_^h 7   
3.转置函数 {H2i+"cF  
4.得到区域中心点，及区域半径函数 Dm#k-y  
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 &u94hlC  
6.文件开启与关闭，这个最常见了，就不说了

'计算夹角函数 SZvsJ)  
Function ff_angle(x1 As Single, y1 As Single, x2 As Single, y2 As Single, x3 As Single, y3 As Single) As Single A4
' aB0^  
   cax = x2 - x1 ( Iew%U  
   cay = y2 - y1 )3sb2 #  
   cbx = x2 - x3 Kq$1lPI  
   cby = y2 - y3 6! 'Xo:p  
   mo_jj = cax * cbx + cay * cby NY x4& *le  
   mo_ca = Sqr(cax * cax + cay * cay) =Frr#t!(w0  
   mo_cb = Sqr(cbx * cbx + cby * cby) @H
I5;z  
   cos_acb = mo_jj / (mo_ca * mo_cb) S}
X:LHr*  
   'ff_cos = cos_acb 2|BE{91  
   If cos_acb >= 1 Then sa*-B  
   nn = 0 mz1g8M`@[D  
   ElseIf cos_acb <= -1 Then rej[G!  
   nn = 3.14159265258979 X;h~s:LM  
   Else Xl;N=fc  
   nn = Atn(-cos_acb / Sqr(-cos_acb * cos_acb + 1)) + 2 * Atn(1) ZV;yXLx|  
   End If x5ia<V>=d  
   'ff_angle = nn Kl?1)u3^4  
   ff_angle = nn * 180 / 3.14159265258979 tPsU7bFk  
End Function

'判断点在区域内函数 ;G$FLL1   
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 ^^#A9AM  
Dim aob, boc, cod, doa, sum As Single 1a<~Rmcil  
  If ppx = p1x And ppy = p1y Then \B)<<[ $  
     point_in = True UWI5/R  
     Exit Function b11C3TyQT  
  End If \GWC5R7Q0j  
  If ppx = p2x And ppy = p2y Then ',f[y:v;  
     point_in = True lgl/| ^ Uw  
     Exit Function eo!z>9#.  
  End If eC?N>wHH  
   If ppx = p3x And ppy = p3y Then Y%3j>_\;  
     point_in = True A Ho<E"R\  
     Exit Function =B 9U  
  End If H,'c&  
     lI9 3{!+>  
    aob = ff_angle(p1x, p1y, ppx, ppy, p2x, p2y) 8MIHp[vm%  
    boc = ff_angle(p2x, p2y, ppx, ppy, p3x, p3y)  l}JVRU{  
    cod = ff_angle(p3x, p3y, ppx, ppy, p4x, p4y) kDsUKO p  
    doa = ff_angle(p4x, p4y, ppx, ppy, p1x, p1y) TO<g@u]*  
    sum = aob + boc + cod + doa
d=[.  
    If 360.01 > sum And sum > 359.99 Then ZYG"nmNd  
       point_in = True _wIAr  
    Else ec|IT0;  
       point_in = False N}\i!YUD  
    End If ||qW'kNWM  
End Function

'得到点半径,得到交点坐标函数 q;rU}hAzG0  
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() ;kY=}=9  
    '求得中心点坐标 c8(.bmvF  
Dim tt As String |nD`0Rbw  
Dim rt(3) As Single yt?#T#  
    '判断是否平行 1*XqwBV  
   acx = p3x - p1x BzDS  
   acy = p3y - p1y Q9( eH2=  
   bdx = p4x - p2x ;I9D>shkc  
   bdy = p4y - p2y akR*|iK#b  
   If acx * bdy = acy * bdx Then (q)W<GYP  
      rt(0) = 0 
$lvpBs  
      Exit Function .NjOaK)\  
   Else s;>jy/o0 s  
      '判断斜率存在否 JWLQ9UX  
      If p1x = p3x And p2x <> p4x Then 5z0S
jQ  
         tt = "ac_n_bd_y" o^Ms(?K%t  
      ElseIf p1x <> p3x And p2x = p4x Then /gxwp:&lY  
         tt = "ac_y_bd_n" m$]?Jq  
      ElseIf p1x <> p3x And p2x <> p4x Then .^/OL}/~<  
         tt = "ac_y_bd_y" !aLL|}S  
      End If YS/4<QA[  
    Select Case tt {&xKSWNc  
         Case "ac_n_bd_y" X4jtti  
            'bd线段方程 g1Aq;Ah/  
            k_bd = bdy / bdx 5WEF^1  
            b_bd = p2y - k_bd * p2x LcQ\d*  
            p_x = p1x bEM-^SR  
            p_y = k_bd * p_x + b_bd ^;L;/I[-  
         Case "ac_y_bd_n"  $///N+B  
            'ac线段方程 X[R/j*K  
            k_ac = acy / acx nP] ~8ViS  
            b_ac = p1y - k_ac * p1x gVO[R6C5C  
            p_x = p2x $cc]pJy"}  
            p_y = k_ac * p_x + b_ac Q~nc:eWD  
        Case "ac_y_bd_y" >xT8[  
           'ac，bd线段都要求 .QW89e,O3  
           k_ac = acy / acx pbJs3uIR  
           b_ac = p1y - k_ac * p1x 4jvgyi9  
           k_bd = bdy / bdx }.x?$C+\"  
           b_bd = p2y - k_bd * p2x >=wlS\:"  
           p_x = -(b_bd - b_ac) / (k_bd - k_ac) KATt9ox@  
           p_y = k_ac * p_x + b_ac 23zB@aE_?1  
        End Select QD<f)JZK  
      rt(1) = p_x JBp^@j{_  
      rt(2) = p_y OXI.>9  
     M*|x,K=U  
'计算最大半径 |*Hw6m  
   rr1 = (p1x - p_x) * (p1x - p_x) + (p1y - p_y) * (p1y - p_y) fVw+8[d0  
   rr2 = (p2x - p_x) * (p2x - p_x) + (p2y - p_y) * (p2y - p_y) K^EW*6vB8O  
   rr3 = (p3x - p_x) * (p3x - p_x) + (p3y - p_y) * (p3y - p_y) P/4]x@{ih  
   rr4 = (p4x - p_x) * (p4x - p_x) + (p4y - p_y) * (p4y - p_y) 5Osx__6$t  
Dim bb(5) As Single ]JbGP{UiN  
  bb(1) = rr1 !M6*A1g5  
  bb(2) = rr2 tAefBFu  
  bb(3) = rr3 I6~.sTl  
  bb(4) = rr4 }5\F<b^@Y  
  nb = rr1 iCnKQG  
For i = 1 To 4  LGV"WE  
    If nb <= bb(i) Then ?(H/a-(:v}  
       nb = bb(i) QYPsqkF*  
    End If x8w455  
Next i eVS6#R]'m  
    rt(0) = Sqr(nb) h,45-#+  
    rr = rt() NZ7g}+GTG  
  End If oIN!3  
         b 'jZ4{+W  
End Function

高手啊.人才啊.

lifei0715:高手啊.人才啊. (2013-04-08 19:15)  PW7{,1te,  

}(tuBJ9  
有热压工艺方面的人才或者资料分享下； uzG{jc^  
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 su:~Xd  

高手真多！

楼主威武霸气.