[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： 4<LRa=XT$  
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图片:2.jpg

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关键点说几个： F]~`57  
1.区域是由点围成的，所以EXCEL中需要定义点的坐标（区域） ;OVJM qg  
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 S B'.   
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 Y<kvJb&1*  

以下是几个重要的函数： -5E%f|U  
1.判断点在区域中函数 o"5R^a@  
2.计算夹角函数 *8MU,6  
3.转置函数 M6g!bK2l  
4.得到区域中心点，及区域半径函数 2TIZltFS0e  
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） MMcHzRF  
6.文件开启与关闭，这个最常见了，就不说了

'计算夹角函数 O </<  
Function ff_angle(x1 As Single, y1 As Single, x2 As Single, y2 As Single, x3 As Single, y3 As Single) As Single 8)M .W  
   cax = x2 - x1 $~U_VQIA^  
   cay = y2 - y1 Z7Mc.[C  
   cbx = x2 - x3 ,qaIdw[  
   cby = y2 - y3 j!jZJD  
   mo_jj = cax * cbx + cay * cby dNbN]gHC  
   mo_ca = Sqr(cax * cax + cay * cay) C2!POf;GdN  
   mo_cb = Sqr(cbx * cbx + cby * cby) P 7gS M  
   cos_acb = mo_jj / (mo_ca * mo_cb) HO$s&}t  
   'ff_cos = cos_acb Y[*z6gP(  
   If cos_acb >= 1 Then x'n J_0  
   nn = 0 @(oz`|*  
   ElseIf cos_acb <= -1 Then "-N%`UA  
   nn = 3.14159265258979 W;u~}k<  
   Else \@tt$ m%  
   nn = Atn(-cos_acb / Sqr(-cos_acb * cos_acb + 1)) + 2 * Atn(1) 4Mnne'7  
   End If 6%O"  
   'ff_angle = nn O cm  
   ff_angle = nn * 180 / 3.14159265258979 ud!iy  
End Function

'判断点在区域内函数 "(T@*"vX2  
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 I gA0RY1  
Dim aob, boc, cod, doa, sum As Single U%j=)VD])  
  If ppx = p1x And ppy = p1y Then :
`oYD  
     point_in = True @[.%A;E4  
     Exit Function 64`V+Hd  
  End If [V}I34UN  
  If ppx = p2x And ppy = p2y Then Hza{"I*^  
     point_in = True =U3!D;XP  
     Exit Function H@5:
x8  
  End If -F@Rpfrj_#  
   If ppx = p3x And ppy = p3y Then c7
P"1  
     point_in = True 0SA  c1  
     Exit Function p@>_1A}qh_  
  End If RLecKw&1{3  
     u;;]S!:M  
    aob = ff_angle(p1x, p1y, ppx, ppy, p2x, p2y) 7S1 Y)  
    boc = ff_angle(p2x, p2y, ppx, ppy, p3x, p3y) uiM*!ge  
    cod = ff_angle(p3x, p3y, ppx, ppy, p4x, p4y)
4k<4=E  
    doa = ff_angle(p4x, p4y, ppx, ppy, p1x, p1y) UPUO8W)<Z6  
    sum = aob + boc + cod + doa (&+ ~hW5d  
    If 360.01 > sum And sum > 359.99 Then EZE/~$`3  
       point_in = True !,INrl[  
    Else WX]kez{<uP  
       point_in = False M|6 W<y  
    End If 8X[G)J;  
End Function

'得到点半径,得到交点坐标函数 ~'=
s?\I  
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() =H3 JRRS  
    '求得中心点坐标 !+=jD3HTJ  
Dim tt As String P ;PS+S9  
Dim rt(3) As Single n3jA[p:  
    '判断是否平行 VQ{}S $jQ  
   acx = p3x - p1x _(TavL>l =  
   acy = p3y - p1y c7L#f=Ot?  
   bdx = p4x - p2x Ojr{z  
   bdy = p4y - p2y FsTE.PT  
   If acx * bdy = acy * bdx Then K({+3vK  
      rt(0) = 0 Iy6"2$%a  
      Exit Function L&][730  
   Else ;WO/xA-#  
      '判断斜率存在否  #/MUiV  
      If p1x = p3x And p2x <> p4x Then 6rF[eb  
         tt = "ac_n_bd_y" >A7),6  
      ElseIf p1x <> p3x And p2x = p4x Then 9{^:+r  
         tt = "ac_y_bd_n" `BdZqXKG  
      ElseIf p1x <> p3x And p2x <> p4x Then Z,! w.TYo  
         tt = "ac_y_bd_y" 4\Mh2z5  
      End If oslV@v F  
    Select Case tt u B~/W  
         Case "ac_n_bd_y" /}]X3ng  
            'bd线段方程 $._p !,<  
            k_bd = bdy / bdx ? D2:'gg  
            b_bd = p2y - k_bd * p2x ^mm:u<Yt  
            p_x = p1x /E@LnKe  
            p_y = k_bd * p_x + b_bd %o.{h  
         Case "ac_y_bd_n" v@&&5J|  
            'ac线段方程 .^X IZ  
            k_ac = acy / acx sX^m1v~N|  
            b_ac = p1y - k_ac * p1x QA+qFP  
            p_x = p2x *.8@hPy  
            p_y = k_ac * p_x + b_ac K%Vl:2#F  
        Case "ac_y_bd_y" Azxy!gDT"  
           'ac，bd线段都要求 ,3qi]fFLMe  
           k_ac = acy / acx [mYmrLs6  
           b_ac = p1y - k_ac * p1x A=Q"IdK  
           k_bd = bdy / bdx D"El6<3)h  
           b_bd = p2y - k_bd * p2x ;sT7c1X^!  
           p_x = -(b_bd - b_ac) / (k_bd - k_ac) X25cU{  
           p_y = k_ac * p_x + b_ac &$ia#j{l  
        End Select .-k\Q}D  
      rt(1) = p_x hvnZ 2x.?d  
      rt(2) = p_y Sx5r u?$.  
     ]HgAI$aA,  
'计算最大半径   lCr  
   rr1 = (p1x - p_x) * (p1x - p_x) + (p1y - p_y) * (p1y - p_y) hp/}Z"A=  
   rr2 = (p2x - p_x) * (p2x - p_x) + (p2y - p_y) * (p2y - p_y) SuMK=^>%  
   rr3 = (p3x - p_x) * (p3x - p_x) + (p3y - p_y) * (p3y - p_y) Z f4Xt Yn  
   rr4 = (p4x - p_x) * (p4x - p_x) + (p4y - p_y) * (p4y - p_y) )wQR2$x~  
Dim bb(5) As Single qhRs5QXL  
  bb(1) = rr1 w4<RV:Vmt  
  bb(2) = rr2 \/p\QT@mm  
  bb(3) = rr3 /lCn^E6-  
  bb(4) = rr4 Q
7gBxp  
  nb = rr1 3+;]dqZ  
For i = 1 To 4 79AOvh  
    If nb <= bb(i) Then w&8gA[y*u  
       nb = bb(i) cfyN)#9  
    End If DB-4S-2  
Next i $cHA_$ `  
    rt(0) = Sqr(nb) d}GO(  
    rr = rt() @@9#odO  
  End If 2VyLt=mdh  
         s(q\!\FS  
End Function

高手啊.人才啊.

lifei0715:高手啊.人才啊. (2013-04-08 19:15)  =Bu>}$BD  

|{]W (/  
有热压工艺方面的人才或者资料分享下； T!
u&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 (+lwt
 

高手真多！

楼主威武霸气.