[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： xt%-<%s%f  
Fnnk}I}  
1HF=,K+  

关键点说几个： +[MzF EE[  
1.区域是由点围成的，所以EXCEL中需要定义点的坐标（区域） qjsS2,wM  
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 *20$u% z2  
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 r.5}Q?  

以下是几个重要的函数： H1]An'qz,  
1.判断点在区域中函数 pNN6PsLt  
2.计算夹角函数 87Sqs1>cw  
3.转置函数 K5O#BBX=  
4.得到区域中心点，及区域半径函数 6R%Ra  
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） o1j_5c PS  
6.文件开启与关闭，这个最常见了，就不说了

'计算夹角函数 G+^Q _w  
Function ff_angle(x1 As Single, y1 As Single, x2 As Single, y2 As Single, x3 As Single, y3 As Single) As Single GXV<fc"1  
   cax = x2 - x1 i1qhe?5  
   cay = y2 - y1 (mHCK5
 
   cbx = x2 - x3 Y)kO"  
   cby = y2 - y3 ;VY0DAp{  
   mo_jj = cax * cbx + cay * cby 0XCtw6  
   mo_ca = Sqr(cax * cax + cay * cay) ]] R*sd*  
   mo_cb = Sqr(cbx * cbx + cby * cby) 9?xMsu-H  
   cos_acb = mo_jj / (mo_ca * mo_cb) 3cuVyf<v  
   'ff_cos = cos_acb [FHSFr E,5  
   If cos_acb >= 1 Then xFU*,Y  
   nn = 0 VCzmTnD  
   ElseIf cos_acb <= -1 Then _lrCf  
   nn = 3.14159265258979 1l$c*STK  
   Else s2-`}LL  
   nn = Atn(-cos_acb / Sqr(-cos_acb * cos_acb + 1)) + 2 * Atn(1) [whX),3>  
   End If (^fiw%#  
   'ff_angle = nn Byx8`Cx1  
   ff_angle = nn * 180 / 3.14159265258979 Y
#9dVUS  
End Function

'判断点在区域内函数 ?[n
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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 %:bTOw[4r  
Dim aob, boc, cod, doa, sum As Single J7FCW^-`3  
  If ppx = p1x And ppy = p1y Then DH(Qmd  
     point_in = True Tx)X\&ij&  
     Exit Function Algk4zfK2,  
  End If =+K2`=y;WF  
  If ppx = p2x And ppy = p2y Then 1bW[RK;GE  
     point_in = True g3r4>SA  
     Exit Function e;1n!_l\  
  End If %d..L-`]ET  
   If ppx = p3x And ppy = p3y Then 9>y6zFTV  
     point_in = True NdpcfZq  
     Exit Function 5^"T`,${  
  End If 6\MH2&L<  
     E'|@hL-jn  
    aob = ff_angle(p1x, p1y, ppx, ppy, p2x, p2y) ?]i.Zi\[f  
    boc = ff_angle(p2x, p2y, ppx, ppy, p3x, p3y) JZQT}  
    cod = ff_angle(p3x, p3y, ppx, ppy, p4x, p4y) E;[ANy4L  
    doa = ff_angle(p4x, p4y, ppx, ppy, p1x, p1y) W2CCLq1
(  
    sum = aob + boc + cod + doa jfxW9][  
    If 360.01 > sum And sum > 359.99 Then mTG v*=l  
       point_in = True Ood8Qty(  
    Else F$l]#G.@A  
       point_in = False de.!~%D  
    End If K8,fw-S%  
End Function

'得到点半径,得到交点坐标函数 J|k~e,C  
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() Im9^mVe  
    '求得中心点坐标 RS'%;B-)  
Dim tt As String ;Drt4fOxX  
Dim rt(3) As Single _x<CTFTL  
    '判断是否平行 nl9G1Sm(E  
   acx = p3x - p1x (A.%q1h  
   acy = p3y - p1y }"?v=9.G  
   bdx = p4x - p2x CO25  
   bdy = p4y - p2y ekB
!d  
   If acx * bdy = acy * bdx Then a?]Ow J  
      rt(0) = 0 [C@0&[[  
      Exit Function wyqXD.of  
   Else <VB;J5Rv  
      '判断斜率存在否 :b^\O  
      If p1x = p3x And p2x <> p4x Then t/?x#X  
         tt = "ac_n_bd_y" :OC`X~}Rc  
      ElseIf p1x <> p3x And p2x = p4x Then l`s_Id#  
         tt = "ac_y_bd_n" >_ji`/d{  
      ElseIf p1x <> p3x And p2x <> p4x Then a0y7a/@c  
         tt = "ac_y_bd_y" X|Gsf= 1S  
      End If 9p ;)s  
    Select Case tt K2J DG.<  
         Case "ac_n_bd_y" vAW+ ,Rfj  
            'bd线段方程 k@qn'Zi  
            k_bd = bdy / bdx Go>_4)jy  
            b_bd = p2y - k_bd * p2x VH3j
 
            p_x = p1x
U0}]3a0  
            p_y = k_bd * p_x + b_bd 8 Zy`Z   
         Case "ac_y_bd_n" D'y/pv}!  
            'ac线段方程 5;=,BWU  
            k_ac = acy / acx )L?JH?$C  
            b_ac = p1y - k_ac * p1x D]nVhOg|  
            p_x = p2x tWkD@w`Lnn  
            p_y = k_ac * p_x + b_ac [ Fid  
        Case "ac_y_bd_y" G
q4~9Tm)*  
           'ac，bd线段都要求 ~
2Jvb[IM  
           k_ac = acy / acx > <WR]`G  
           b_ac = p1y - k_ac * p1x a%2r]:?^?  
           k_bd = bdy / bdx /p
|]*={  
           b_bd = p2y - k_bd * p2x Jq1 Zb  
           p_x = -(b_bd - b_ac) / (k_bd - k_ac)
m09 Bds  
           p_y = k_ac * p_x + b_ac f]F]wg\_f  
        End Select <5*cc8  
      rt(1) = p_x g`)2I+L7  
      rt(2) = p_y sMh3IL9(*  
     ^J0*]k%   
'计算最大半径 $_,?SXM  
   rr1 = (p1x - p_x) * (p1x - p_x) + (p1y - p_y) * (p1y - p_y) \]  
   rr2 = (p2x - p_x) * (p2x - p_x) + (p2y - p_y) * (p2y - p_y) mgeNH~%m@*  
   rr3 = (p3x - p_x) * (p3x - p_x) + (p3y - p_y) * (p3y - p_y) ~Ein)5  
   rr4 = (p4x - p_x) * (p4x - p_x) + (p4y - p_y) * (p4y - p_y) Bor_Kib  
Dim bb(5) As Single A!}Wpw%(/  
  bb(1) = rr1 3DRXao  
  bb(2) = rr2 mO$]f4}  
  bb(3) = rr3 )ymd#?wq
 
  bb(4) = rr4 FilHpnQCt  
  nb = rr1 S[!-M\b  
For i = 1 To 4 6AgevyVG  
    If nb <= bb(i) Then PE1F3u>O  
       nb = bb(i) OZdiM&Zss  
    End If )]Xj"V2  
Next i k?|l;6  
    rt(0) = Sqr(nb) x6A*vP0nm)  
    rr = rt() yP\KIm!  
  End If ]Auk5M+  
         qG.HJD  
End Function

高手啊.人才啊.

lifei0715:高手啊.人才啊. (2013-04-08 19:15)  p?S:J`q  

K2PV^Y  
有热压工艺方面的人才或者资料分享下； DIO @Zo  
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 e6n1/TtqM  

高手真多！

楼主威武霸气.