[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： F_Cz  
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图片:2.jpg

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关键点说几个： ;<<IXXKU
 
1.区域是由点围成的，所以EXCEL中需要定义点的坐标（区域） FRk_xxe"K  
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 {Dq51  
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 P`"DepeD  

以下是几个重要的函数： dtl<  
1.判断点在区域中函数 dD<kNa}2  
2.计算夹角函数 r1a
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3.转置函数 h!~yYNQ"  
4.得到区域中心点，及区域半径函数 >@uYleD(  
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） 59 Y=VS
 
6.文件开启与关闭，这个最常见了，就不说了

'计算夹角函数 rnE'gH(V'  
Function ff_angle(x1 As Single, y1 As Single, x2 As Single, y2 As Single, x3 As Single, y3 As Single) As Single _4Pi>  
   cax = x2 - x1 L 3@wdC~0  
   cay = y2 - y1 Y))sk-  
   cbx = x2 - x3 6si-IJ  
   cby = y2 - y3 E}2[Pb)e  
   mo_jj = cax * cbx + cay * cby 0fU>L^P_?  
   mo_ca = Sqr(cax * cax + cay * cay) PX)qA=4q  
   mo_cb = Sqr(cbx * cbx + cby * cby) b@hoH)<9E  
   cos_acb = mo_jj / (mo_ca * mo_cb) Z5A<TC/:  
   'ff_cos = cos_acb MJ08@xGa  
   If cos_acb >= 1 Then ~O$]y5  
   nn = 0 Qpq0j^\  
   ElseIf cos_acb <= -1 Then l !v#6#iq  
   nn = 3.14159265258979 _Tz!~z  
   Else #
cb6~AH  
   nn = Atn(-cos_acb / Sqr(-cos_acb * cos_acb + 1)) + 2 * Atn(1) kq-RM#Dj:  
   End If h+@t8Q;gGw  
   'ff_angle = nn BW 7[JD  
   ff_angle = nn * 180 / 3.14159265258979 rC16?RovQ@  
End Function

'判断点在区域内函数 bX1ip2X lk  
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 Op{Mc$5a  
Dim aob, boc, cod, doa, sum As Single =fPO0Ot;  
  If ppx = p1x And ppy = p1y Then w?q"%F;/  
     point_in = True <0m;|Ai'W  
     Exit Function oL;/Qan  
  End If @gOgs  
  If ppx = p2x And ppy = p2y Then dmO|PswW  
     point_in = True ZHJzh\?  
     Exit Function WyETg!b[  
  End If /2@@v|QL  
   If ppx = p3x And ppy = p3y Then d?n~9_9e  
     point_in = True V*~5*OwB  
     Exit Function >smaR^m  
  End If iDsjIW\j  
     Lsdu:+-  
    aob = ff_angle(p1x, p1y, ppx, ppy, p2x, p2y) 6BnjT  
    boc = ff_angle(p2x, p2y, ppx, ppy, p3x, p3y) hCgNS1%4  
    cod = ff_angle(p3x, p3y, ppx, ppy, p4x, p4y) %O${EN  
    doa = ff_angle(p4x, p4y, ppx, ppy, p1x, p1y) qz&)|~,\C  
    sum = aob + boc + cod + doa <PxEl4  
    If 360.01 > sum And sum > 359.99 Then mN`a]L'  
       point_in = True hGeRM4zVZZ  
    Else N.?Wev{  
       point_in = False P$bo8*  
    End If `*a,8M%  
End Function

'得到点半径,得到交点坐标函数 '};Xb|msU  
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() RUEUn  
    '求得中心点坐标 I zT%Kq  
Dim tt As String So:89T  
Dim rt(3) As Single *sTQ9 Kr  
    '判断是否平行 bpzA ' g>  
   acx = p3x - p1x KR*/yeG!E  
   acy = p3y - p1y ZD/!C9:&.0  
   bdx = p4x - p2x = 4If7  
   bdy = p4y - p2y cmTZ))m  
   If acx * bdy = acy * bdx Then ?2M15Q  
      rt(0) = 0 qv:WC TAn  
      Exit Function .jCdJ =z  
   Else e|I5Nx2)  
      '判断斜率存在否 C9h8d
 
      If p1x = p3x And p2x <> p4x Then :X^B1z3X4  
         tt = "ac_n_bd_y" vv u((b  
      ElseIf p1x <> p3x And p2x = p4x Then xASjw?  
         tt = "ac_y_bd_n" Wq4?`{  
      ElseIf p1x <> p3x And p2x <> p4x Then U;(&!Ei  
         tt = "ac_y_bd_y" a4
wh-35/  
      End If k`-L5#
`  
    Select Case tt X7G6y|4;w  
         Case "ac_n_bd_y" ?}y7S]B FI  
            'bd线段方程 P|\,kw>l  
            k_bd = bdy / bdx V;m3=k0U  
            b_bd = p2y - k_bd * p2x (<ejJPWT  
            p_x = p1x W`Soa&9  
            p_y = k_bd * p_x + b_bd
l$FHL2?Cp  
         Case "ac_y_bd_n" A1|:$tED+2  
            'ac线段方程 * .e^s3q$  
            k_ac = acy / acx Y/ `
fPgE  
            b_ac = p1y - k_ac * p1x lBCM;#P  
            p_x = p2x olqHa5qn  
            p_y = k_ac * p_x + b_ac 7 MfpZgC  
        Case "ac_y_bd_y"  -x7L8Wj  
           'ac，bd线段都要求 W46sKD;\^W  
           k_ac = acy / acx MV/JZ;55  
           b_ac = p1y - k_ac * p1x !} 1p:@  
           k_bd = bdy / bdx M! s&<Bi  
           b_bd = p2y - k_bd * p2x fROhn}<**[  
           p_x = -(b_bd - b_ac) / (k_bd - k_ac) `);`E_'U k  
           p_y = k_ac * p_x + b_ac  I{E10;  
        End Select {DpZg",H-  
      rt(1) = p_x znM"P|A  
      rt(2) = p_y 9+L! A  
     os>|LPv4  
'计算最大半径 d.{RZq2cp  
   rr1 = (p1x - p_x) * (p1x - p_x) + (p1y - p_y) * (p1y - p_y) (Yx rZ_F'b  
   rr2 = (p2x - p_x) * (p2x - p_x) + (p2y - p_y) * (p2y - p_y) '{J!5x?L^  
   rr3 = (p3x - p_x) * (p3x - p_x) + (p3y - p_y) * (p3y - p_y) MW p^.  
   rr4 = (p4x - p_x) * (p4x - p_x) + (p4y - p_y) * (p4y - p_y) 4[6A~iC_  
Dim bb(5) As Single
"8-]6p3u  
  bb(1) = rr1 '?-GZ0oM  
  bb(2) = rr2 Dr;@)  
  bb(3) = rr3 z_zr3XR
9  
  bb(4) = rr4 E_xpq  
  nb = rr1 -i58FJ`B  
For i = 1 To 4 +%FGti$[  
    If nb <= bb(i) Then 5!?><{k=%  
       nb = bb(i) *bZV4}  
    End If %1#5 7-  
Next i {
&/q\UQ  
    rt(0) = Sqr(nb) u~G,=n  
    rr = rt() TfJB;  
  End If iKDGYM  
         p<$z!|7m  
End Function

高手啊.人才啊.

lifei0715:高手啊.人才啊. (2013-04-08 19:15)  Q+gQ"l,95  

eZT923tD  
有热压工艺方面的人才或者资料分享下； d:Wh0y}  
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 f0}+8JW5h  

高手真多！

楼主威武霸气.