[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： RW#&f*  
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图片:2.jpg

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关键点说几个： S690Y]:h$v  
1.区域是由点围成的，所以EXCEL中需要定义点的坐标（区域） 0={@GhjApL  
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 3Ishe
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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 *K{-J*   

以下是几个重要的函数： "kLu]M<  
1.判断点在区域中函数 Ya#,\;dTT  
2.计算夹角函数 j^t#>tZS  
3.转置函数 l>KkK|!T^i  
4.得到区域中心点，及区域半径函数 VSK!Pc.G}
 
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） :MOr?"  
6.文件开启与关闭，这个最常见了，就不说了

'计算夹角函数 ^-s'Ad3  
Function ff_angle(x1 As Single, y1 As Single, x2 As Single, y2 As Single, x3 As Single, y3 As Single) As Single 9t 3mU:  
   cax = x2 - x1 a/9R~DwN  
   cay = y2 - y1 u7rA8u|TO  
   cbx = x2 - x3 :# 1d;jx  
   cby = y2 - y3 6`KAl rH  
   mo_jj = cax * cbx + cay * cby >L\>Th{o  
   mo_ca = Sqr(cax * cax + cay * cay) [n[!RddY  
   mo_cb = Sqr(cbx * cbx + cby * cby) ]Iku(<*Ya  
   cos_acb = mo_jj / (mo_ca * mo_cb) y7K&@Y  
   'ff_cos = cos_acb Kq`C5  
   If cos_acb >= 1 Then )c'5M]V  
   nn = 0 -&PiD  
   ElseIf cos_acb <= -1 Then E0;KTcZi  
   nn = 3.14159265258979 .hYrE5\-  
   Else h$#QRH  
   nn = Atn(-cos_acb / Sqr(-cos_acb * cos_acb + 1)) + 2 * Atn(1) ohK_~  
   End If 2v ^bd^]u:  
   'ff_angle = nn zJp}
JO  
   ff_angle = nn * 180 / 3.14159265258979 CNC3">Dk~9  
End Function

'判断点在区域内函数 sV8}Gv a  
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 W6. )7Y,  
Dim aob, boc, cod, doa, sum As Single _:hrm%^  
  If ppx = p1x And ppy = p1y Then .ZuRH_pI  
     point_in = True 9(;5!q,Gsg  
     Exit Function Vej [wY-c  
  End If "O{_LOJ  
  If ppx = p2x And ppy = p2y Then [>5<&[A  
     point_in = True {H]xA3[]  
     Exit Function ~H[  
  End If mWOW39Ku  
   If ppx = p3x And ppy = p3y Then .\r=1HZ3  
     point_in = True a;=)`  
     Exit Function "N"$B~W*  
  End If "m*.kB)e7  
     {!? @u?M  
    aob = ff_angle(p1x, p1y, ppx, ppy, p2x, p2y) x-wIgo+  
    boc = ff_angle(p2x, p2y, ppx, ppy, p3x, p3y) -__RFxG  
    cod = ff_angle(p3x, p3y, ppx, ppy, p4x, p4y) K?;_T$^K  
    doa = ff_angle(p4x, p4y, ppx, ppy, p1x, p1y) ;7id![KI4  
    sum = aob + boc + cod + doa `
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    If 360.01 > sum And sum > 359.99 Then ]V|rOtxb  
       point_in = True H .F-mm  
    Else ~r/"w'dB  
       point_in = False gZa/?[+  
    End If F32N e6Y6"  
End Function

'得到点半径,得到交点坐标函数 G.2\Sw  
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!R.QI^2VT  
    '求得中心点坐标 T1$fu(f
 
Dim tt As String #@ClhpLD  
Dim rt(3) As Single 1D*oXE9Ig  
    '判断是否平行 w}8 ,ICL  
   acx = p3x - p1x C%2BDj  
   acy = p3y - p1y vY 0EffZ  
   bdx = p4x - p2x #&V7CYJ  
   bdy = p4y - p2y OQlmzg  
   If acx * bdy = acy * bdx Then 7a$K@iWU  
      rt(0) = 0 D4@).%  
      Exit Function YmrrZ&]q  
   Else o,-p[1b  
      '判断斜率存在否 xq6 eu 9  
      If p1x = p3x And p2x <> p4x Then 5j8aMnvs  
         tt = "ac_n_bd_y"  Dno]N  
      ElseIf p1x <> p3x And p2x = p4x Then nt 9LBea  
         tt = "ac_y_bd_n" PK C}!>2  
      ElseIf p1x <> p3x And p2x <> p4x Then (/mR p  
         tt = "ac_y_bd_y" _xKIp>A  
      End If M =/+q  
    Select Case tt Tu!2lHK;  
         Case "ac_n_bd_y" ;mT|0&o>#  
            'bd线段方程 \d'>Ky;GD  
            k_bd = bdy / bdx \ltbiDP2  
            b_bd = p2y - k_bd * p2x ^sF/-/ {?U  
            p_x = p1x B$=oU  
            p_y = k_bd * p_x + b_bd DOaTp f  
         Case "ac_y_bd_n" :EGvI  
            'ac线段方程 (:(Imk;9  
            k_ac = acy / acx (Q]Ww_r~  
            b_ac = p1y - k_ac * p1x dd+hX$,  
            p_x = p2x lfJvN  
            p_y = k_ac * p_x + b_ac aru;
yR  
        Case "ac_y_bd_y" `49:!M$i  
           'ac，bd线段都要求 >(?}'pS8  
           k_ac = acy / acx <E2nM,  
           b_ac = p1y - k_ac * p1x !_?K(X~/  
           k_bd = bdy / bdx |o@xWs@m  
           b_bd = p2y - k_bd * p2x vpg*J/1[  
           p_x = -(b_bd - b_ac) / (k_bd - k_ac) >='y+68  
           p_y = k_ac * p_x + b_ac QZh#&Qf;  
        End Select &GfDo4$  
      rt(1) = p_x ]>9[}'u  
      rt(2) = p_y .](~dVp%~  
     &Z3u(Eb  
'计算最大半径 +^6a$ N  
   rr1 = (p1x - p_x) * (p1x - p_x) + (p1y - p_y) * (p1y - p_y) +vr|J:  
   rr2 = (p2x - p_x) * (p2x - p_x) + (p2y - p_y) * (p2y - p_y) qWdob>u  
   rr3 = (p3x - p_x) * (p3x - p_x) + (p3y - p_y) * (p3y - p_y) 3(oB[9]s  
   rr4 = (p4x - p_x) * (p4x - p_x) + (p4y - p_y) * (p4y - p_y) |j2$G~B6  
Dim bb(5) As Single E%b*MU  
  bb(1) = rr1 nk*T x  
  bb(2) = rr2 ]lqe,>  
  bb(3) = rr3 ;f!}vo<;  
  bb(4) = rr4 g`Kh&|GU  
  nb = rr1 qg06*$%  
For i = 1 To 4 ,I2x&Ys&.  
    If nb <= bb(i) Then I^GZ9@UE  
       nb = bb(i) L^FQ|?*  
    End If r`\6+Ntb.  
Next i #?h-<KQQ  
    rt(0) = Sqr(nb) l!*!)qCB(S  
    rr = rt() ,k9xI<i  
  End If WHy r;m3)  
         Q,LDn%+;B*  
End Function

高手啊.人才啊.

lifei0715:高手啊.人才啊. (2013-04-08 19:15)  *{(tg~2'(  

[JEf P/n|.  
有热压工艺方面的人才或者资料分享下； ZKJhmk  
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 Y+DVwz
$  

高手真多！

楼主威武霸气.