[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： 2r|!:^'?W  
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图片:2.jpg

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关键点说几个： br9`77J8  
1.区域是由点围成的，所以EXCEL中需要定义点的坐标（区域） Lx"a#rZ  
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 a~-^$Fzgy  
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 U0M>A  

以下是几个重要的函数： *0^t;A+  
1.判断点在区域中函数 YTco;5/  
2.计算夹角函数 M\s^>7es  
3.转置函数 X; gN[  
4.得到区域中心点，及区域半径函数 dIo|i,-  
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） pw7_j;}l  
6.文件开启与关闭，这个最常见了，就不说了

'计算夹角函数 JHf}LZu  
Function ff_angle(x1 As Single, y1 As Single, x2 As Single, y2 As Single, x3 As Single, y3 As Single) As Single .~5cNu'#m  
   cax = x2 - x1 m,u? ^W  
   cay = y2 - y1 g(:y_EpmLH  
   cbx = x2 - x3 P-~Av
b  
   cby = y2 - y3 Pc]c8~  
   mo_jj = cax * cbx + cay * cby _W: S>ij(  
   mo_ca = Sqr(cax * cax + cay * cay) >NwrJSx  
   mo_cb = Sqr(cbx * cbx + cby * cby) d]e`t"Aj  
   cos_acb = mo_jj / (mo_ca * mo_cb) b>%I=H%g  
   'ff_cos = cos_acb l!ye\
 
   If cos_acb >= 1 Then @ %z5]w  
   nn = 0 p;n)YY$  
   ElseIf cos_acb <= -1 Then 'ce9v@(0  
   nn = 3.14159265258979 WII_s|YSt%  
   Else ,>
(M5\Z/c  
   nn = Atn(-cos_acb / Sqr(-cos_acb * cos_acb + 1)) + 2 * Atn(1) 2|~&x~  
   End If pAmTwe  
   'ff_angle = nn GX_Lxc_<f  
   ff_angle = nn * 180 / 3.14159265258979 +V|]:{3W  
End Function

'判断点在区域内函数 fWm;cDM H  
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 oS_p/$F,  
Dim aob, boc, cod, doa, sum As Single dl{3fldb  
  If ppx = p1x And ppy = p1y Then g6W.Gl"5\w  
     point_in = True sCb?TyN'n  
     Exit Function `%ymg8^  
  End If NHc+QMbou(  
  If ppx = p2x And ppy = p2y Then dy`~%lX?  
     point_in = True Vxgc|E^J  
     Exit Function P6=|C;[  
  End If sZ4H\  
   If ppx = p3x And ppy = p3y Then SwP h-6  
     point_in = True 9DtSYd/  
     Exit Function hV8A<VT  
  End If 6 *8Ge  
     */8\Z46z  
    aob = ff_angle(p1x, p1y, ppx, ppy, p2x, p2y) WJ9u3+  
    boc = ff_angle(p2x, p2y, ppx, ppy, p3x, p3y) 'ZDa*9nkF  
    cod = ff_angle(p3x, p3y, ppx, ppy, p4x, p4y) r?V|9B`$p  
    doa = ff_angle(p4x, p4y, ppx, ppy, p1x, p1y) Vr0RdO  
    sum = aob + boc + cod + doa v5$zz w  
    If 360.01 > sum And sum > 359.99 Then n6uobo-  
       point_in = True !E7/:t4  
    Else |R[m&uOib  
       point_in = False L,kF]
 
    End If ng 6G<hi  
End Function

'得到点半径,得到交点坐标函数 W4|;JmT.r  
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() W.CIyGK  
    '求得中心点坐标 7v:;`6Jb  
Dim tt As String n_+Iw,a'm  
Dim rt(3) As Single g+CHF?O  
    '判断是否平行 {l1;&y?  
   acx = p3x - p1x 0!zWXKX  
   acy = p3y - p1y x-W0 h  
   bdx = p4x - p2x FJ[(dGKeE  
   bdy = p4y - p2y N!va12  
   If acx * bdy = acy * bdx Then @F1pu3E  
      rt(0) = 0 EagI)W!s[  
      Exit Function U--ER r8  
   Else
FPMW"~v  
      '判断斜率存在否 C/$IF M<  
      If p1x = p3x And p2x <> p4x Then 1GNAx\(  
         tt = "ac_n_bd_y" }l2JXf55  
      ElseIf p1x <> p3x And p2x = p4x Then &S{F"z  
         tt = "ac_y_bd_n" /[-hJ=<Yb  
      ElseIf p1x <> p3x And p2x <> p4x Then r#j*vO '  
         tt = "ac_y_bd_y" >9klh-f  
      End If a|>MueJ  
    Select Case tt _1Eyqh`oh  
         Case "ac_n_bd_y" =wQ=`  
            'bd线段方程 R's xa*VB  
            k_bd = bdy / bdx *5NffiA}-  
            b_bd = p2y - k_bd * p2x =sm(
Z;"  
            p_x = p1x Nf~<xK  
            p_y = k_bd * p_x + b_bd  e?7paJ  
         Case "ac_y_bd_n" $OO[C={v[  
            'ac线段方程 nk{1z\D{  
            k_ac = acy / acx l%IOdco#  
            b_ac = p1y - k_ac * p1x (/Mc
$V  
            p_x = p2x ;Cy@TzO/|  
            p_y = k_ac * p_x + b_ac Mc6y'w  
        Case "ac_y_bd_y" AjS5  
           'ac，bd线段都要求 4j*}|@x  
           k_ac = acy / acx f0F$*"#G  
           b_ac = p1y - k_ac * p1x Q
&J,"Vxw  
           k_bd = bdy / bdx (!b: gG  
           b_bd = p2y - k_bd * p2x 8+u8piG  
           p_x = -(b_bd - b_ac) / (k_bd - k_ac) oK>,MdB  
           p_y = k_ac * p_x + b_ac `4=b|N+b"  
        End Select a !IH-XJ2  
      rt(1) = p_x xI@~Ig  
      rt(2) = p_y HT&0i,`  
     8%4`Yj=  
'计算最大半径 GxkG$B  
   rr1 = (p1x - p_x) * (p1x - p_x) + (p1y - p_y) * (p1y - p_y) oxzNV&D[{`  
   rr2 = (p2x - p_x) * (p2x - p_x) + (p2y - p_y) * (p2y - p_y) 6~}H
3rvO}  
   rr3 = (p3x - p_x) * (p3x - p_x) + (p3y - p_y) * (p3y - p_y) dd$N4&  
   rr4 = (p4x - p_x) * (p4x - p_x) + (p4y - p_y) * (p4y - p_y) x6t;=  
Dim bb(5) As Single :QVGY^c  
  bb(1) = rr1 >W;i2%T  
  bb(2) = rr2  UyQn onS  
  bb(3) = rr3 b>i=",i
\  
  bb(4) = rr4 5-OvPTY`M  
  nb = rr1
 W6~=?C  
For i = 1 To 4 CytpL`&^]  
    If nb <= bb(i) Then No7Q,p  
       nb = bb(i) j#&  
    End If Trrh`@R  
Next i 0 OBkd  
    rt(0) = Sqr(nb) ,B2-'O  
    rr = rt() %gaKnT(|r  
  End If \p$0  
         $c}0L0  
End Function

高手啊.人才啊.

lifei0715:高手啊.人才啊. (2013-04-08 19:15)  p{q!jm~Nq  

c1kxKxE  
有热压工艺方面的人才或者资料分享下； -fJ@R1]  
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 ;9 ,mV(w  

高手真多！

楼主威武霸气.