[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： cZ2kYn8  
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描述:请输入描述

图片:2.jpg

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关键点说几个： t_$2CRG#  
1.区域是由点围成的，所以EXCEL中需要定义点的坐标（区域） J2xw) +  
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 s)6U_  
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 l^pA2yh|  

以下是几个重要的函数： ,>0*@2
 
1.判断点在区域中函数 /7|V+6jV  
2.计算夹角函数 3 I@}my1  
3.转置函数 t>`asL  
4.得到区域中心点，及区域半径函数 @oV9)  
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） CkoLTY  
6.文件开启与关闭，这个最常见了，就不说了

'计算夹角函数 v*
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Function ff_angle(x1 As Single, y1 As Single, x2 As Single, y2 As Single, x3 As Single, y3 As Single) As Single 0 yuW*z  
   cax = x2 - x1 GzI yP(U  
   cay = y2 - y1 M42Ssn)  
   cbx = x2 - x3 Rn9m]x  
   cby = y2 - y3 / zB0J?  
   mo_jj = cax * cbx + cay * cby DRp~jW(\y  
   mo_ca = Sqr(cax * cax + cay * cay) h?BFvbAt  
   mo_cb = Sqr(cbx * cbx + cby * cby)
2(u,SQ  
   cos_acb = mo_jj / (mo_ca * mo_cb) {B?Wu3-  
   'ff_cos = cos_acb bzuEfFaL  
   If cos_acb >= 1 Then
WaVtfg$!  
   nn = 0 | r&k48@  
   ElseIf cos_acb <= -1 Then &eCa0s?mI  
   nn = 3.14159265258979 z$/_I
0[  
   Else R`DKu=  
   nn = Atn(-cos_acb / Sqr(-cos_acb * cos_acb + 1)) + 2 * Atn(1) t<z`N-5*  
   End If MGR!Z@1y  
   'ff_angle = nn PT=2@kH  
   ff_angle = nn * 180 / 3.14159265258979 +;N2p1ZBf  
End Function

'判断点在区域内函数 aE&,]'6  
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 ftvG\Tf  
Dim aob, boc, cod, doa, sum As Single K?B{rE Lp  
  If ppx = p1x And ppy = p1y Then OjJXysslXO  
     point_in = True "a ueL/dgN  
     Exit Function [ sN EHf  
  End If XC0bI,Fu,  
  If ppx = p2x And ppy = p2y Then -:2$ %  
     point_in = True rz wF~-m +  
     Exit Function R?~Yp?B^  
  End If %k-3?%&8  
   If ppx = p3x And ppy = p3y Then \O*-#}~\  
     point_in = True Zhh2v>QOy  
     Exit Function \r /ya<5  
  End If ~P8tUhff
K  
     ewa wL"  
    aob = ff_angle(p1x, p1y, ppx, ppy, p2x, p2y) iYORu3  
    boc = ff_angle(p2x, p2y, ppx, ppy, p3x, p3y) 5R
@  
    cod = ff_angle(p3x, p3y, ppx, ppy, p4x, p4y) 0B@SN)<kH  
    doa = ff_angle(p4x, p4y, ppx, ppy, p1x, p1y) Z:,U]Z(  
    sum = aob + boc + cod + doa Vr6@>@SC  
    If 360.01 > sum And sum > 359.99 Then !UG 7Uer  
       point_in = True T (O
W  
    Else f&eK|7J_Yf  
       point_in = False %QH)'GJQ  
    End If !46RGU:I  
End Function

'得到点半径,得到交点坐标函数 -yE/f2PgQ  
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() !/}O>v~o  
    '求得中心点坐标 qfL~Wp2E;  
Dim tt As String SSz~YR^}Sr  
Dim rt(3) As Single l>Z5 uSG  
    '判断是否平行 $FlW1E j  
   acx = p3x - p1x Gb8D[1=u=  
   acy = p3y - p1y 0Fk5kGD,&K  
   bdx = p4x - p2x 1<BX]-/tP  
   bdy = p4y - p2y jNLw=  
   If acx * bdy = acy * bdx Then NLUT#!Gr  
      rt(0) = 0 ]l1\? I  
      Exit Function LQtj~c>X-|  
   Else v1BDP<qU2  
      '判断斜率存在否 ap&?r`Tu  
      If p1x = p3x And p2x <> p4x Then 0'V5/W  
         tt = "ac_n_bd_y" 3Mxp)uG/  
      ElseIf p1x <> p3x And p2x = p4x Then f|h|q_<;  
         tt = "ac_y_bd_n" !n* +(lZ  
      ElseIf p1x <> p3x And p2x <> p4x Then p[hZ@f(z  
         tt = "ac_y_bd_y" ;'5>q&[qbP  
      End If ::ajlRZG  
    Select Case tt ue4Vcf  
         Case "ac_n_bd_y" 2_n7=&  
            'bd线段方程 2q3+0Et8  
            k_bd = bdy / bdx iz8Bf;  
            b_bd = p2y - k_bd * p2x Cnbz=z  
            p_x = p1x BybW)+~  
            p_y = k_bd * p_x + b_bd \^ZlG.  
         Case "ac_y_bd_n" aa>xIW,u  
            'ac线段方程 |?qquD 4=  
            k_ac = acy / acx V,q](bg  
            b_ac = p1y - k_ac * p1x Svondc 4  
            p_x = p2x 7NDr1Z#B6V  
            p_y = k_ac * p_x + b_ac r30 <(nF  
        Case "ac_y_bd_y" 0Uo\wyd  
           'ac，bd线段都要求 SS$[VV  
           k_ac = acy / acx RoU55mL  
           b_ac = p1y - k_ac * p1x A%`[mc]4#  
           k_bd = bdy / bdx (iL|Sq&}b  
           b_bd = p2y - k_bd * p2x {$R' WXVs  
           p_x = -(b_bd - b_ac) / (k_bd - k_ac) ptDY3n~'  
           p_y = k_ac * p_x + b_ac wQe_vY  
        End Select Q$HG  
      rt(1) = p_x {B[=?6tQ  
      rt(2) = p_y *MJX?  
     U<CTubF  
'计算最大半径 a"FCZ.O1  
   rr1 = (p1x - p_x) * (p1x - p_x) + (p1y - p_y) * (p1y - p_y) lrv3fPIW  
   rr2 = (p2x - p_x) * (p2x - p_x) + (p2y - p_y) * (p2y - p_y) A9wh(P0\  
   rr3 = (p3x - p_x) * (p3x - p_x) + (p3y - p_y) * (p3y - p_y) e6d<dXx  
   rr4 = (p4x - p_x) * (p4x - p_x) + (p4y - p_y) * (p4y - p_y) J@4Bf  
Dim bb(5) As Single ~ vJ,`?  
  bb(1) = rr1 B?4boF?~  
  bb(2) = rr2 bsB*533  
  bb(3) = rr3 R $&o*K`?  
  bb(4) = rr4 8ELCs<xI  
  nb = rr1 /Y'Vh^9/T  
For i = 1 To 4 :a$\/E=  
    If nb <= bb(i) Then "br,/Dk>MX  
       nb = bb(i) MFb9H{LA  
    End If F)W:  
Next i }UWL-TkEjF  
    rt(0) = Sqr(nb) =K
6($|'=  
    rr = rt() kg'o&^/=  
  End If Qk,I^1w?7  
         Jh ]i]7r  
End Function

高手啊.人才啊.

lifei0715:高手啊.人才啊. (2013-04-08 19:15)  &8l%T'gd  

6P5Ih  
有热压工艺方面的人才或者资料分享下； Q4f/Z  
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 /+\uqF8F  

高手真多！

楼主威武霸气.