[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： iTj"lA  
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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： omXBnzT  
1.区域是由点围成的，所以EXCEL中需要定义点的坐标（区域） NvQY7C  
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 CPc"  
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 )?!vJb"  

以下是几个重要的函数： E9L!O.Q  
1.判断点在区域中函数 7V9%)%=h|  
2.计算夹角函数 <Cf7E  
3.转置函数 QVnO
  
4.得到区域中心点，及区域半径函数 D=i0e8D!+  
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） 8L]gQ g  
6.文件开启与关闭，这个最常见了，就不说了

'计算夹角函数 :0J-ek.;  
Function ff_angle(x1 As Single, y1 As Single, x2 As Single, y2 As Single, x3 As Single, y3 As Single) As Single ?#VP)A  
   cax = x2 - x1 ]ro1{wm!WU  
   cay = y2 - y1 '<RB  
   cbx = x2 - x3 ;a!h.8UJPI  
   cby = y2 - y3 <6d{k[7fz)  
   mo_jj = cax * cbx + cay * cby ]>VJ--fH  
   mo_ca = Sqr(cax * cax + cay * cay) t7U,AQ=;P5  
   mo_cb = Sqr(cbx * cbx + cby * cby) TS\A`{^T  
   cos_acb = mo_jj / (mo_ca * mo_cb) EWuiaw.  
   'ff_cos = cos_acb .LeF|EQU\@  
   If cos_acb >= 1 Then pO-s@"j]  
   nn = 0 ?L<UOv7;t  
   ElseIf cos_acb <= -1 Then H3p4,Y}'#  
   nn = 3.14159265258979 N=O+X~  
   Else u7WTSL%  
   nn = Atn(-cos_acb / Sqr(-cos_acb * cos_acb + 1)) + 2 * Atn(1) c~^]jqid]  
   End If Q70**qm  
   'ff_angle = nn +LQs.*  
   ff_angle = nn * 180 / 3.14159265258979 g9FVb7In_  
End Function

'判断点在区域内函数 q/rHHuY}  
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 ery?G-  
Dim aob, boc, cod, doa, sum As Single s0`|G|.}  
  If ppx = p1x And ppy = p1y Then 4t%:O4 3e  
     point_in = True 3IJI5K_  
     Exit Function Dj,+t+|  
  End If iS:PRa1  
  If ppx = p2x And ppy = p2y Then Zgy2Pot  
     point_in = True zP{<0o  
     Exit Function }0Kqy;  
  End If |ZST Y}RXA  
   If ppx = p3x And ppy = p3y Then TQ
5MKqR$  
     point_in = True 'sjJSc  
     Exit Function {P<BJ52=  
  End If 764}yV>  
     t_zY0{|P  
    aob = ff_angle(p1x, p1y, ppx, ppy, p2x, p2y) Oc"'ay(g  
    boc = ff_angle(p2x, p2y, ppx, ppy, p3x, p3y) Q#J>vwi=  
    cod = ff_angle(p3x, p3y, ppx, ppy, p4x, p4y) jOm&yX  
    doa = ff_angle(p4x, p4y, ppx, ppy, p1x, p1y) |4p<T!T  
    sum = aob + boc + cod + doa ?;.1fJU>  
    If 360.01 > sum And sum > 359.99 Then y-)+I<M  
       point_in = True o7@4=m}  
    Else 3"^)bG
e  
       point_in = False q~g&hR}K  
    End If ik1L  
End Function

'得到点半径,得到交点坐标函数 ev;5?9\E  
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() [Tb3z:UUvf  
    '求得中心点坐标 Pdo5sve  
Dim tt As String 9a~BAH,j  
Dim rt(3) As Single /m{?o  
    '判断是否平行 C!/8e (!N  
   acx = p3x - p1x $Op/5j  
   acy = p3y - p1y <rwOI.W l$  
   bdx = p4x - p2x J\dhi{0  
   bdy = p4y - p2y WJFTy+bD  
   If acx * bdy = acy * bdx Then $Pb[c%'  
      rt(0) = 0 rD(ep~^M  
      Exit Function .k:&&sAz  
   Else %dk$K!5D0  
      '判断斜率存在否 *l?% o{  
      If p1x = p3x And p2x <> p4x Then AZ]SRz9mKY  
         tt = "ac_n_bd_y" e2hk  
      ElseIf p1x <> p3x And p2x = p4x Then s<r.+zqW  
         tt = "ac_y_bd_n" <T.3ZZ%  
      ElseIf p1x <> p3x And p2x <> p4x Then A^Hp#b@  
         tt = "ac_y_bd_y" G`9F.T_Z^)  
      End If @qhg[= @  
    Select Case tt 3d)+44G_)  
         Case "ac_n_bd_y" #u=O 5%.  
            'bd线段方程 CQuvbAo  
            k_bd = bdy / bdx -_4jJxh=OB  
            b_bd = p2y - k_bd * p2x k#=leu"I  
            p_x = p1x ;,B@84'  
            p_y = k_bd * p_x + b_bd l& ^B   
         Case "ac_y_bd_n" <T_Nlar^^  
            'ac线段方程 @%@^5  
            k_ac = acy / acx IO&#)Ft  
            b_ac = p1y - k_ac * p1x $E~Lu$|  
            p_x = p2x HG3>RcB  
            p_y = k_ac * p_x + b_ac ,cO)Sxj  
        Case "ac_y_bd_y" NW>:Lz ?"  
           'ac，bd线段都要求 _467~5JkU  
           k_ac = acy / acx 8^"|-~
#<  
           b_ac = p1y - k_ac * p1x XOU-8;d  
           k_bd = bdy / bdx NMY!-Kv 5  
           b_bd = p2y - k_bd * p2x J%[N-  
           p_x = -(b_bd - b_ac) / (k_bd - k_ac) S~(VcC$K  
           p_y = k_ac * p_x + b_ac K~ /V  
        End Select vLT12v:)`  
      rt(1) = p_x W%XS0k}x  
      rt(2) = p_y cp?P@-  
     S| -{wC%  
'计算最大半径 e4W];7_K!  
   rr1 = (p1x - p_x) * (p1x - p_x) + (p1y - p_y) * (p1y - p_y) ZE(RvPW  
   rr2 = (p2x - p_x) * (p2x - p_x) + (p2y - p_y) * (p2y - p_y) 
TtjSLkF  
   rr3 = (p3x - p_x) * (p3x - p_x) + (p3y - p_y) * (p3y - p_y) y`@4n.Q  
   rr4 = (p4x - p_x) * (p4x - p_x) + (p4y - p_y) * (p4y - p_y) 6C51:XQO  
Dim bb(5) As Single 1H[;7@o$e  
  bb(1) = rr1 }]GK@nn7  
  bb(2) = rr2 \w_[tPz}  
  bb(3) = rr3 eD1MP<>h  
  bb(4) = rr4 rMFZ#38d  
  nb = rr1 ?d#(ian  
For i = 1 To 4 <fxjj  
    If nb <= bb(i) Then *U^I`j[u  
       nb = bb(i) [[DFEvOEh  
    End If yrYaKh  
Next i COL8YY  
    rt(0) = Sqr(nb) }N9a!,{P=b  
    rr = rt() S_-mmzC(  
  End If +
~{nU'  
         m)RxV@  
End Function

高手啊.人才啊.

lifei0715:高手啊.人才啊. (2013-04-08 19:15)  8[XNFFUZs  

p{u}t!`!d  
有热压工艺方面的人才或者资料分享下； ~_6rD`2cJ  
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 #jR?C9&!(  

高手真多！

楼主威武霸气.