[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： ;q6FdS  
Q?\rwnW?U  
Nq3q##Ut:  

关键点说几个： Wi?37EHr  
1.区域是由点围成的，所以EXCEL中需要定义点的坐标（区域） k 8Swra?j  
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 X)K3X:~L+  
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 !Xbr7:UPN1  

以下是几个重要的函数： _"PTO&E  
1.判断点在区域中函数 i7fQj, q  
2.计算夹角函数 ~ZSP K;D[  
3.转置函数 $Qv+*%c  
4.得到区域中心点，及区域半径函数 9W{=6D86e  
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） x"Hi!h)v  
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/9dPod  
Function ff_angle(x1 As Single, y1 As Single, x2 As Single, y2 As Single, x3 As Single, y3 As Single) As Single Xz'pZ*Hr$v  
   cax = x2 - x1 >5&'_  
   cay = y2 - y1 99@uU[&IJ  
   cbx = x2 - x3 8Vkw vc  
   cby = y2 - y3 <|NP!eMsw8  
   mo_jj = cax * cbx + cay * cby a{7>7%[  
   mo_ca = Sqr(cax * cax + cay * cay) &i8AB{OU  
   mo_cb = Sqr(cbx * cbx + cby * cby) t%e}'?#^  
   cos_acb = mo_jj / (mo_ca * mo_cb) /HsJyp+t  
   'ff_cos = cos_acb ISI\<qx  
   If cos_acb >= 1 Then 8I)66  
   nn = 0 a W`q  
   ElseIf cos_acb <= -1 Then uoYG@L2  
   nn = 3.14159265258979 yVvO!  
   Else 3[E3]]OVa  
   nn = Atn(-cos_acb / Sqr(-cos_acb * cos_acb + 1)) + 2 * Atn(1) C:/O]slH  
   End If 7u!i)<pn  
   'ff_angle = nn TKpka]nJ  
   ff_angle = nn * 180 / 3.14159265258979 ErK5iTSD  
End Function

'判断点在区域内函数 RU3:[(7  
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 D.zEE-cGyb  
Dim aob, boc, cod, doa, sum As Single 5w)tsGX\  
  If ppx = p1x And ppy = p1y Then GndU}[0J  
     point_in = True a9C8Q l  
     Exit Function gwDQ@  
  End If cXiNO ke&  
  If ppx = p2x And ppy = p2y Then eXY*l>B  
     point_in = True w yP|#Z\  
     Exit Function +jePp_3$O  
  End If NGIbUH1[  
   If ppx = p3x And ppy = p3y Then M=$ qus  
     point_in = True !63
p?Q=  
     Exit Function T u>5H`  
  End If ?IR]y-r  
     >J+'hm@  
    aob = ff_angle(p1x, p1y, ppx, ppy, p2x, p2y) ezn%*X y,  
    boc = ff_angle(p2x, p2y, ppx, ppy, p3x, p3y) Tf/j
d 3>  
    cod = ff_angle(p3x, p3y, ppx, ppy, p4x, p4y) <rZ(B>$  
    doa = ff_angle(p4x, p4y, ppx, ppy, p1x, p1y) fvn`$  
    sum = aob + boc + cod + doa +;uP) "Q/L  
    If 360.01 > sum And sum > 359.99 Then P,-f]k[_  
       point_in = True yOwo(+ 2  
    Else W($}G_j[B1  
       point_in = False TbqH-R3W  
    End If @>n7  
End Function

'得到点半径,得到交点坐标函数 IE7%u92  
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() THC7e>P4  
    '求得中心点坐标 M0Y#=u.  
Dim tt As String _m.u@+g  
Dim rt(3) As Single K
Y5it9e  
    '判断是否平行 }+/j/es{]  
   acx = p3x - p1x a6\0XVU  
   acy = p3y - p1y |>_e&}Y%L  
   bdx = p4x - p2x FXMrD,qVg  
   bdy = p4y - p2y jeb]3i=pw  
   If acx * bdy = acy * bdx Then 3@#WYvD  
      rt(0) = 0 }8 V/Cd9  
      Exit Function gR7in!8  
   Else \4$V;C/n,  
      '判断斜率存在否 ]fxYSm  
      If p1x = p3x And p2x <> p4x Then []^fb,5a  
         tt = "ac_n_bd_y" }7?n\I+n"  
      ElseIf p1x <> p3x And p2x = p4x Then \ZNUt$\  
         tt = "ac_y_bd_n" @">^2  
      ElseIf p1x <> p3x And p2x <> p4x Then ViZ Tl~  
         tt = "ac_y_bd_y" X5[.X()M4  
      End If +H"[WZ5  
    Select Case tt $?x;?wS0V  
         Case "ac_n_bd_y" >3aB{[[N  
            'bd线段方程 MTI[Mez  
            k_bd = bdy / bdx vwF#;jj\  
            b_bd = p2y - k_bd * p2x K qK?w*Qw  
            p_x = p1x )W,tL*9[  
            p_y = k_bd * p_x + b_bd |E]`rfr  
         Case "ac_y_bd_n" ^w|D^F=o  
            'ac线段方程 *vFXe_.  
            k_ac = acy / acx +95: O 8  
            b_ac = p1y - k_ac * p1x dgbqMu"  
            p_x = p2x UdGa#rcNW  
            p_y = k_ac * p_x + b_ac 1u`{yl*+?  
        Case "ac_y_bd_y" $TU:iv1Fm  
           'ac，bd线段都要求 E4}MU}C#[  
           k_ac = acy / acx `^d[$IbDW  
           b_ac = p1y - k_ac * p1x {3)^$F=T  
           k_bd = bdy / bdx W20qn>{z  
           b_bd = p2y - k_bd * p2x 9:\#GOg  
           p_x = -(b_bd - b_ac) / (k_bd - k_ac) "W71#n+[  
           p_y = k_ac * p_x + b_ac r<)>k.] !  
        End Select FdwlRuG  
      rt(1) = p_x %"yy8~|  
      rt(2) = p_y )t?_3'W  
     4Su|aWL-  
'计算最大半径 :
`Sd5b>  
   rr1 = (p1x - p_x) * (p1x - p_x) + (p1y - p_y) * (p1y - p_y) rjaG{ i  
   rr2 = (p2x - p_x) * (p2x - p_x) + (p2y - p_y) * (p2y - p_y) bM@8[&ta  
   rr3 = (p3x - p_x) * (p3x - p_x) + (p3y - p_y) * (p3y - p_y) XEX-NE"]  
   rr4 = (p4x - p_x) * (p4x - p_x) + (p4y - p_y) * (p4y - p_y) "gIjU~'A  
Dim bb(5) As Single vV$6fvS  
  bb(1) = rr1 =|j~*6Hd  
  bb(2) = rr2 5~!&x@  
  bb(3) = rr3 pw, <0UhV  
  bb(4) = rr4 _6Z}_SiOl  
  nb = rr1 B5R/GV  
For i = 1 To 4 K?J?]VCw  
    If nb <= bb(i) Then ABG>W>H-S  
       nb = bb(i) x<=<Lx0B;  
    End If d,V]j-  
Next i &YpWfY&V  
    rt(0) = Sqr(nb) j&y>?Y&Sb  
    rr = rt() m[w 8|[  
  End If Bk yW
 
         h.t2;O,b  
End Function

高手啊.人才啊.

lifei0715:高手啊.人才啊. (2013-04-08 19:15)  A_}%YHb
 

K26x,m]p  
有热压工艺方面的人才或者资料分享下； fNZ:l=L3):  
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 "YQ%j+  

高手真多！

楼主威武霸气.