[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： '[P}&<ie,  
^4v*W;Q  
qu6DQ@ ~YC  

关键点说几个： 3mt%!}S  
1.区域是由点围成的，所以EXCEL中需要定义点的坐标（区域） Vs0 SXj  
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}4}&  
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 \6j^kY=  

以下是几个重要的函数： EH9Hpo  
1.判断点在区域中函数 JSMPyj  
2.计算夹角函数 yDd[e]zS`  
3.转置函数 Db03Nk>#  
4.得到区域中心点，及区域半径函数 l`n5~Fs  
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） udqge?Tz  
6.文件开启与关闭，这个最常见了，就不说了

'计算夹角函数 Wpm9`K  
Function ff_angle(x1 As Single, y1 As Single, x2 As Single, y2 As Single, x3 As Single, y3 As Single) As Single x
l!K;Y2<  
   cax = x2 - x1 ;lfWuU%R  
   cay = y2 - y1 !ng\` |8?  
   cbx = x2 - x3 J 3?Dj  
   cby = y2 - y3 #Q6w+"  
   mo_jj = cax * cbx + cay * cby nmE5]Pcg  
   mo_ca = Sqr(cax * cax + cay * cay) c;V D}UD'  
   mo_cb = Sqr(cbx * cbx + cby * cby) -
Ds|qzrN%  
   cos_acb = mo_jj / (mo_ca * mo_cb) %O) Z  
   'ff_cos = cos_acb _-a|VTM  
   If cos_acb >= 1 Then Yw"P)Zp  
   nn = 0 ckwF|:e7*  
   ElseIf cos_acb <= -1 Then ?n*fy  
   nn = 3.14159265258979 hLA;Bl  
   Else &:vscOl  
   nn = Atn(-cos_acb / Sqr(-cos_acb * cos_acb + 1)) + 2 * Atn(1) Y1r,2k  
   End If 1mUTtYU  
   'ff_angle = nn qC j*>D  
   ff_angle = nn * 180 / 3.14159265258979 I6w/0,azC  
End Function

'判断点在区域内函数 a!u3HS-i  
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<:p.ug-O  
Dim aob, boc, cod, doa, sum As Single #:W%,$9\P  
  If ppx = p1x And ppy = p1y Then x(6vh2#vD  
     point_in = True /+P5)q TKL  
     Exit Function :@e\'~7sH  
  End If !fZ
LQc  
  If ppx = p2x And ppy = p2y Then W?PWJkIw  
     point_in = True Ki 3_N*z  
     Exit Function 5&%fkZ0  
  End If sX~45u \  
   If ppx = p3x And ppy = p3y Then s"rg_FoL  
     point_in = True z@`@I  
     Exit Function 62NkU)u  
  End If Qdm(q:w  
     S-P{/;c@  
    aob = ff_angle(p1x, p1y, ppx, ppy, p2x, p2y) YAMfP8S  
    boc = ff_angle(p2x, p2y, ppx, ppy, p3x, p3y) l'2H4W_+  
    cod = ff_angle(p3x, p3y, ppx, ppy, p4x, p4y) R\ q):,  
    doa = ff_angle(p4x, p4y, ppx, ppy, p1x, p1y) thQ J(w  
    sum = aob + boc + cod + doa q(1r<2  
    If 360.01 > sum And sum > 359.99 Then GWh|FEqUbf  
       point_in = True [iXi\Ex  
    Else
3se$,QmN  
       point_in = False ]W|RtdF3.N  
    End If ~._ko  
End Function

'得到点半径,得到交点坐标函数 8iOO1I?+  
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() l"?]BC~  
    '求得中心点坐标 lkN'uZ  
Dim tt As String [DL|Ht>  
Dim rt(3) As Single
`M6YblnJZ  
    '判断是否平行 Ba<#1p7_  
   acx = p3x - p1x ^K/G5  
   acy = p3y - p1y `_0)
kdu  
   bdx = p4x - p2x "p`o]$Wv  
   bdy = p4y - p2y Djy
p3uUA/  
   If acx * bdy = acy * bdx Then m"q/,}DR  
      rt(0) = 0 Bjtj{B  
      Exit Function +yiU@K).0  
   Else CY5w$E  
      '判断斜率存在否 #9INX`s-  
      If p1x = p3x And p2x <> p4x Then k5g@myb-  
         tt = "ac_n_bd_y" z=[l.Af_  
      ElseIf p1x <> p3x And p2x = p4x Then %L28$c3p  
         tt = "ac_y_bd_n" dUZ$wbV%h  
      ElseIf p1x <> p3x And p2x <> p4x Then K^8@'#S  
         tt = "ac_y_bd_y" h2AGEg'g2[  
      End If :K:f^o]s  
    Select Case tt -#daBx ?  
         Case "ac_n_bd_y" t+j
IHo  
            'bd线段方程 V15q01bE#  
            k_bd = bdy / bdx >b3@>W  
            b_bd = p2y - k_bd * p2x Q^vGj</u  
            p_x = p1x va@XbUC  
            p_y = k_bd * p_x + b_bd Z%KL[R}^w;  
         Case "ac_y_bd_n" |iAEDZn  
            'ac线段方程 fHLFeSfH  
            k_ac = acy / acx S'|lU@PCl  
            b_ac = p1y - k_ac * p1x BU'Ki \  
            p_x = p2x ^z38<L=z"  
            p_y = k_ac * p_x + b_ac  sN;(/O  
        Case "ac_y_bd_y" ;r%<2
(  
           'ac，bd线段都要求 n}+wd9J*!2  
           k_ac = acy / acx 3g^IXm:K$  
           b_ac = p1y - k_ac * p1x d8D yv#gT  
           k_bd = bdy / bdx cgzy0$8dj\  
           b_bd = p2y - k_bd * p2x B*32D8t`u
 
           p_x = -(b_bd - b_ac) / (k_bd - k_ac) %bEGv:88s  
           p_y = k_ac * p_x + b_ac >s44  
        End Select |G>q:]+AV  
      rt(1) = p_x Y=hPErw  
      rt(2) = p_y t`) 'LT  
    
bGhhh/n  
'计算最大半径 Q3(hK<Qh;  
   rr1 = (p1x - p_x) * (p1x - p_x) + (p1y - p_y) * (p1y - p_y) o.p+j  
   rr2 = (p2x - p_x) * (p2x - p_x) + (p2y - p_y) * (p2y - p_y) b8eDD+ulk  
   rr3 = (p3x - p_x) * (p3x - p_x) + (p3y - p_y) * (p3y - p_y) ]aREQ?ma&z  
   rr4 = (p4x - p_x) * (p4x - p_x) + (p4y - p_y) * (p4y - p_y) zwKg  
Dim bb(5) As Single #W_i{
bdO  
  bb(1) = rr1 XSD"/_xD  
  bb(2) = rr2 58qaA\iw  
  bb(3) = rr3 i:MlD5 F  
  bb(4) = rr4 "r:H5) !  
  nb = rr1 |:~("rA+v  
For i = 1 To 4 n+v!H O"2u  
    If nb <= bb(i) Then ?SHc}iaU#  
       nb = bb(i) GH[ U!J  
    End If `MN&(!&C*  
Next i 5hlJbWJa  
    rt(0) = Sqr(nb) H't`Q&]a  
    rr = rt() Bk\*0B  
  End If Sr4dY`V*:z  
         rOs)B21/  
End Function

高手啊.人才啊.

lifei0715:高手啊.人才啊. (2013-04-08 19:15)  E9Qd>o  

u+I r:k  
有热压工艺方面的人才或者资料分享下； E<98ahZ?l  
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 @?^LxqAWA  

高手真多！

楼主威武霸气.