[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： XncX2E4E  
<}lah%4F  

描述:请输入描述

图片:2.jpg

z-MQGqxR  

关键点说几个： .I>rX#aNt  
1.区域是由点围成的，所以EXCEL中需要定义点的坐标（区域） Q
crhgR  
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 se.HA  
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 'o)Y!VYnJF  

以下是几个重要的函数： }>M\iPO.]*  
1.判断点在区域中函数 3Iqvc v  
2.计算夹角函数 r^6@Zwox]  
3.转置函数 3ibQbk  
4.得到区域中心点，及区域半径函数 E G+/2o+W  
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） d-b<_k{p  
6.文件开启与关闭，这个最常见了，就不说了

'计算夹角函数 cz,CL/rno  
Function ff_angle(x1 As Single, y1 As Single, x2 As Single, y2 As Single, x3 As Single, y3 As Single) As Single ZxSnqbyA*  
   cax = x2 - x1 4 .c1  
   cay = y2 - y1 }'tJc $!  
   cbx = x2 - x3 Y2tVq})!  
   cby = y2 - y3 SrH::-{  
   mo_jj = cax * cbx + cay * cby h!uyTgq  
   mo_ca = Sqr(cax * cax + cay * cay) `uMc.:5\  
   mo_cb = Sqr(cbx * cbx + cby * cby) V|@bITJ?7  
   cos_acb = mo_jj / (mo_ca * mo_cb) "Y^j=?1k  
   'ff_cos = cos_acb LU;zpXg\  
   If cos_acb >= 1 Then cY5;~lO  
   nn = 0 zWU]4;,"  
   ElseIf cos_acb <= -1 Then 'k]~Q{K$  
   nn = 3.14159265258979 b-/QZvg  
   Else h STcL:b   
   nn = Atn(-cos_acb / Sqr(-cos_acb * cos_acb + 1)) + 2 * Atn(1) st
* sv}  
   End If ML'y`S  
   'ff_angle = nn DzMg^
Kp  
   ff_angle = nn * 180 / 3.14159265258979 UUDHknm"  
End Function

'判断点在区域内函数 {H
(l"KuL  
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 [/q Bvuun  
Dim aob, boc, cod, doa, sum As Single E,tdn#_|  
  If ppx = p1x And ppy = p1y Then ~n@rX=Y)]0  
     point_in = True jZ-s6r2=  
     Exit Function $.C-
_L  
  End If al}J^MJ  
  If ppx = p2x And ppy = p2y Then TW>GYGz  
     point_in = True $adZ|Q\  
     Exit Function czIAx1R9  
  End If 2? yo  
   If ppx = p3x And ppy = p3y Then e(/F:ZEh  
     point_in = True hsrf2Xw[  
     Exit Function &kzys
v-_  
  End If 2#:p:R8I>  
     U!-N
x9  
    aob = ff_angle(p1x, p1y, ppx, ppy, p2x, p2y) +@^);b6  
    boc = ff_angle(p2x, p2y, ppx, ppy, p3x, p3y) 1xEOYM)  
    cod = ff_angle(p3x, p3y, ppx, ppy, p4x, p4y) MhCU; !  
    doa = ff_angle(p4x, p4y, ppx, ppy, p1x, p1y) mj$Ucql  
    sum = aob + boc + cod + doa /;(ji?wN  
    If 360.01 > sum And sum > 359.99 Then JMt*GFd  
       point_in = True R+NiIoa  
    Else FfM^2`xP  
       point_in = False 6Jq[]l"v  
    End If 6Ot~Q  
End Function

'得到点半径,得到交点坐标函数 Gqd|F>  
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() V($V8P/  
    '求得中心点坐标 *'{-!Y  
Dim tt As String G*+^b'7  
Dim rt(3) As Single T%)E!:}v  
    '判断是否平行 lvWwr!w  
   acx = p3x - p1x exhU!p8  
   acy = p3y - p1y ;_"|#  
   bdx = p4x - p2x ,9bnR;f\  
   bdy = p4y - p2y FiiDmhu  
   If acx * bdy = acy * bdx Then HQm_ K0$  
      rt(0) = 0 A/<u>cCW  
      Exit Function IyHbl_P ^  
   Else -:ucp2  
      '判断斜率存在否 ~i;{+j6Ho!  
      If p1x = p3x And p2x <> p4x Then S
u,:f_If,  
         tt = "ac_n_bd_y" PX|@D_%Y=  
      ElseIf p1x <> p3x And p2x = p4x Then U)bv,{-q  
         tt = "ac_y_bd_n" wUCxa>h'  
      ElseIf p1x <> p3x And p2x <> p4x Then \PE;R.v_:  
         tt = "ac_y_bd_y" IANSpWea?  
      End If T3P9  
    Select Case tt  viAAb  
         Case "ac_n_bd_y" >E<ib[vK[  
            'bd线段方程 7m
-%  
            k_bd = bdy / bdx O<cP1TF  
            b_bd = p2y - k_bd * p2x Gf\h7)T\  
            p_x = p1x hNN[djR  
            p_y = k_bd * p_x + b_bd bOj)Wu  
         Case "ac_y_bd_n" z;S-Q,  
            'ac线段方程 DD$>3`  
            k_ac = acy / acx !}TsFa  
            b_ac = p1y - k_ac * p1x *7Q6b 4~"  
            p_x = p2x A0)^I:&  
            p_y = k_ac * p_x + b_ac mcez3gH  
        Case "ac_y_bd_y" e7U\gtZ.  
           'ac，bd线段都要求 v~Q'm1!O4\  
           k_ac = acy / acx uAPVR  
           b_ac = p1y - k_ac * p1x N;|^C{uz  
           k_bd = bdy / bdx ~'_cBJ 'XD  
           b_bd = p2y - k_bd * p2x S\TXx79PhC  
           p_x = -(b_bd - b_ac) / (k_bd - k_ac) en< $.aY  
           p_y = k_ac * p_x + b_ac 0MHiW=  
        End Select ?A3L8^tR  
      rt(1) = p_x k3#'g'>yh  
      rt(2) = p_y tVn?cS  
     H\S)a FY[  
'计算最大半径 +%W8Juu  
   rr1 = (p1x - p_x) * (p1x - p_x) + (p1y - p_y) * (p1y - p_y) i 6G40!G=)  
   rr2 = (p2x - p_x) * (p2x - p_x) + (p2y - p_y) * (p2y - p_y) SQ>i:D;  
   rr3 = (p3x - p_x) * (p3x - p_x) + (p3y - p_y) * (p3y - p_y) |Ghk8 WA  
   rr4 = (p4x - p_x) * (p4x - p_x) + (p4y - p_y) * (p4y - p_y) +Dy^4p?o  
Dim bb(5) As Single 1Nt &+o  
  bb(1) = rr1 `}PYltW  
  bb(2) = rr2 u;_~{VJ-  
  bb(3) = rr3 E
raGG"+  
  bb(4) = rr4 I$7eiW @  
  nb = rr1 R_PF*q2 '  
For i = 1 To 4 X.t4;  
    If nb <= bb(i) Then [%.v;+L  
       nb = bb(i) ~29p|X<  
    End If >7>I1  
Next i v=N?(6T  
    rt(0) = Sqr(nb) *HKw;I   
    rr = rt() =5+*TL`  
  End If yn62NyK  
         T`EV uRJ  
End Function

高手啊.人才啊.

lifei0715:高手啊.人才啊. (2013-04-08 19:15)  ,erw(7}'.  

1vj/6L  
有热压工艺方面的人才或者资料分享下； 9j,g&G.K  
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 z|l*5@p  

高手真多！

楼主威武霸气.