[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： J~,Ny_L  
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关键点说几个： `of`uB  
1.区域是由点围成的，所以EXCEL中需要定义点的坐标（区域） m(6SiV=D9  
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 M,V~oc5
 
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 ZT'VF~  

以下是几个重要的函数： 7%x 3o#&  
1.判断点在区域中函数 3LK]VuZE  
2.计算夹角函数 MfJ8+3@K  
3.转置函数 +q NX/F  
4.得到区域中心点，及区域半径函数 VGDds  
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） [h;&r"1  
6.文件开启与关闭，这个最常见了，就不说了

'计算夹角函数 tn@MOOPl  
Function ff_angle(x1 As Single, y1 As Single, x2 As Single, y2 As Single, x3 As Single, y3 As Single) As Single bU+ z(Eg6  
   cax = x2 - x1 XC NM  
   cay = y2 - y1 9f+S-!  
   cbx = x2 - x3 y;1 'hP&  
   cby = y2 - y3 f:)%+)U<Xm  
   mo_jj = cax * cbx + cay * cby I<v:xTor  
   mo_ca = Sqr(cax * cax + cay * cay) =^L?Sgg  
   mo_cb = Sqr(cbx * cbx + cby * cby) 2wKW17wj,  
   cos_acb = mo_jj / (mo_ca * mo_cb) :j=/>d],%  
   'ff_cos = cos_acb sh|@X\EZO  
   If cos_acb >= 1 Then _h7qS  
   nn = 0 %?`TyVt&0  
   ElseIf cos_acb <= -1 Then qDzd_E@aR  
   nn = 3.14159265258979 vi:IO  
   Else 265sNaX  
   nn = Atn(-cos_acb / Sqr(-cos_acb * cos_acb + 1)) + 2 * Atn(1) NjL^FqA[  
   End If ={GYJ.*Ah  
   'ff_angle = nn rElbzL"&<  
   ff_angle = nn * 180 / 3.14159265258979 >AsrPU[  
End Function

'判断点在区域内函数 N8s2v W  
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 `QIYnokL  
Dim aob, boc, cod, doa, sum As Single 'aFjyY?%  
  If ppx = p1x And ppy = p1y Then 1E]|>)$  
     point_in = True mF|7:zSo  
     Exit Function 5V{ B,T  
  End If %#^)hX,+Q  
  If ppx = p2x And ppy = p2y Then pjh o#yP  
     point_in = True ?'I[[KuG  
     Exit Function $Bd13%>)  
  End If
< mb.F-8  
   If ppx = p3x And ppy = p3y Then B<`'h  
     point_in = True iHp@R-g  
     Exit Function X
w|t.0  
  End If z g'1T2t  
     e=]>TeqG0  
    aob = ff_angle(p1x, p1y, ppx, ppy, p2x, p2y) 5,pKv  
    boc = ff_angle(p2x, p2y, ppx, ppy, p3x, p3y) 99<0xN(25  
    cod = ff_angle(p3x, p3y, ppx, ppy, p4x, p4y) XehpW}2\  
    doa = ff_angle(p4x, p4y, ppx, ppy, p1x, p1y) D)u 9Y  
    sum = aob + boc + cod + doa WrS|$: 0  
    If 360.01 > sum And sum > 359.99 Then `(RQh@H  
       point_in = True H,F/u&O  
    Else &vy/Vd  
       point_in = False C9`J6Uu  
    End If AxXFzMW  
End Function

'得到点半径,得到交点坐标函数 jmcb-=ts  
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() x}w"2[fL  
    '求得中心点坐标 4|&7j7<u  
Dim tt As String \Lz2"JI  
Dim rt(3) As Single 2hjR'6h"Y  
    '判断是否平行 GYx_9"J\
5  
   acx = p3x - p1x (ei;Y~i  
   acy = p3y - p1y Dn6k,nVh  
   bdx = p4x - p2x 0]F'k8yLN  
   bdy = p4y - p2y q;))3aQe  
   If acx * bdy = acy * bdx Then ?D].Za^km  
      rt(0) = 0 SX{shM2  
      Exit Function N@M(Iw  
   Else %'}L.OvG  
      '判断斜率存在否
k \|[=  
      If p1x = p3x And p2x <> p4x Then [w%MECTe  
         tt = "ac_n_bd_y" X[frL)k]  
      ElseIf p1x <> p3x And p2x = p4x Then KP
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         tt = "ac_y_bd_n" $II[b-X?S  
      ElseIf p1x <> p3x And p2x <> p4x Then kKFSCl/g  
         tt = "ac_y_bd_y" hSgfp  
      End If o@?3i+%}8  
    Select Case tt X(-e-:B4;  
         Case "ac_n_bd_y" G;n'c7BV  
            'bd线段方程 [TZlvX(E  
            k_bd = bdy / bdx cT8`l!RD<  
            b_bd = p2y - k_bd * p2x _)J;PbK~  
            p_x = p1x 58H[sM4>  
            p_y = k_bd * p_x + b_bd q;T3bxp+  
         Case "ac_y_bd_n" ~~?4w.k  
            'ac线段方程 |(gq:O  
            k_ac = acy / acx VrF(0,-Z`3  
            b_ac = p1y - k_ac * p1x `"0#lZ`n  
            p_x = p2x x?J- {6k  
            p_y = k_ac * p_x + b_ac Kilq Jg1%C  
        Case "ac_y_bd_y" 73$^y)A
vY  
           'ac，bd线段都要求 H61,pr
>  
           k_ac = acy / acx m6aq_u{W  
           b_ac = p1y - k_ac * p1x _P!J0  
           k_bd = bdy / bdx f-9&n4=H  
           b_bd = p2y - k_bd * p2x ?_e2)+q8YG  
           p_x = -(b_bd - b_ac) / (k_bd - k_ac) KzeTf?G  
           p_y = k_ac * p_x + b_ac m6BIQ(l  
        End Select G<kslTPyq  
      rt(1) = p_x ^h+<Q%'a'  
      rt(2) = p_y }5H3DavW  
     Azx4+`!-  
'计算最大半径 u>Z0u
g6x  
   rr1 = (p1x - p_x) * (p1x - p_x) + (p1y - p_y) * (p1y - p_y) m*L*# ZBS  
   rr2 = (p2x - p_x) * (p2x - p_x) + (p2y - p_y) * (p2y - p_y) XqVhC):  
   rr3 = (p3x - p_x) * (p3x - p_x) + (p3y - p_y) * (p3y - p_y) ^|@t2Rp@  
   rr4 = (p4x - p_x) * (p4x - p_x) + (p4y - p_y) * (p4y - p_y) k zhek >  
Dim bb(5) As Single .+<Ul]e/  
  bb(1) = rr1 ^CUeq"GYoZ  
  bb(2) = rr2 AZ)H/#b
e  
  bb(3) = rr3 mie<jha  
  bb(4) = rr4 !>B|z=  
  nb = rr1 ;z;O}<8s  
For i = 1 To 4 LL5n{#)N  
    If nb <= bb(i) Then 8(UUc>g  
       nb = bb(i) 7:U^Ki  
    End If JcEPwF.  
Next i |3f?1:"Z  
    rt(0) = Sqr(nb) ?Kw~O"L8  
    rr = rt() etdI:N*x  
  End If YEoQIR  
         0c4H2RW  
End Function

高手啊.人才啊.

lifei0715:高手啊.人才啊. (2013-04-08 19:15)  c\cPmj@  

2fIHFo\8  
有热压工艺方面的人才或者资料分享下； : p# 5nYi  
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 (/TYET_H  

高手真多！

楼主威武霸气.