[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： *

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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： ov>L-  
1.区域是由点围成的，所以EXCEL中需要定义点的坐标（区域） ]7 mSM  
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:f=JuAx  
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 `bF;Ew;  

以下是几个重要的函数： ob #XKL  
1.判断点在区域中函数 KVy5/A/8c  
2.计算夹角函数  '|T=  
3.转置函数 HpAZ{P7  
4.得到区域中心点，及区域半径函数 |_m;@.44?U  
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） u;}B4Rx
  
6.文件开启与关闭，这个最常见了，就不说了

'计算夹角函数 I),8EEf\  
Function ff_angle(x1 As Single, y1 As Single, x2 As Single, y2 As Single, x3 As Single, y3 As Single) As Single q4=RE  
   cax = x2 - x1 xd@DN;e  
   cay = y2 - y1 k#n=mm'N9  
   cbx = x2 - x3 rkl7p?  
   cby = y2 - y3 CG;D(AWR;  
   mo_jj = cax * cbx + cay * cby ?#m5$CFp  
   mo_ca = Sqr(cax * cax + cay * cay) h@d m:=ul  
   mo_cb = Sqr(cbx * cbx + cby * cby) Xv:IbM> Qc  
   cos_acb = mo_jj / (mo_ca * mo_cb) wQc w#  
   'ff_cos = cos_acb i\G3 u#  
   If cos_acb >= 1 Then Q<pM tW  
   nn = 0  .@Cshj  
   ElseIf cos_acb <= -1 Then  tS7u#YMh  
   nn = 3.14159265258979 Jt8 v=<@  
   Else ,}0pK\Y>$  
   nn = Atn(-cos_acb / Sqr(-cos_acb * cos_acb + 1)) + 2 * Atn(1) M<Mr (z  
   End If +|;IIwo  
   'ff_angle = nn b&1@rE-  
   ff_angle = nn * 180 / 3.14159265258979 Zpmy)W]1  
End Function

'判断点在区域内函数 x3Uv&  
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 kXWx )v  
Dim aob, boc, cod, doa, sum As Single d9(FwmE  
  If ppx = p1x And ppy = p1y Then +,lD_{}_  
     point_in = True -)@.D>HsOt  
     Exit Function rxARJso  
  End If qJ@?[|2R  
  If ppx = p2x And ppy = p2y Then _,^sI%  
     point_in = True @4i DN  
     Exit Function DYS(ZY)4  
  End If |zMQe}R@%  
   If ppx = p3x And ppy = p3y Then d:D2[  
     point_in = True l- l}xBf  
     Exit Function ~#@EjQCq  
  End If c.fj[U|j  
     L*z;-,  
    aob = ff_angle(p1x, p1y, ppx, ppy, p2x, p2y) 4jpF^&y7u^  
    boc = ff_angle(p2x, p2y, ppx, ppy, p3x, p3y) =EKJ!{  
    cod = ff_angle(p3x, p3y, ppx, ppy, p4x, p4y) gT.-Cf{  
    doa = ff_angle(p4x, p4y, ppx, ppy, p1x, p1y) S%@$J~\rx  
    sum = aob + boc + cod + doa llzl-2`/  
    If 360.01 > sum And sum > 359.99 Then oZ}e w!V
 
       point_in = True }5k"aCno  
    Else vXF\PMf  
       point_in = False 61'7b`:(hi  
    End If v>XE]c_  
End Function

'得到点半径,得到交点坐标函数 /Yh8r1^2tZ  
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() &[YG\8sxWa  
    '求得中心点坐标 7v-C-u[E`  
Dim tt As String k2=uP8  
Dim rt(3) As Single #xc[)Y,W  
    '判断是否平行 c:0$ Mw=  
   acx = p3x - p1x BWs\'B  
   acy = p3y - p1y %;<FfS  
   bdx = p4x - p2x {t7 M  
   bdy = p4y - p2y vl#/8]0!  
   If acx * bdy = acy * bdx Then ;[xDc>&("Q  
      rt(0) = 0 +,MzD'(D  
      Exit Function R9W(MLe58  
   Else eYagI  
      '判断斜率存在否 *f(}@U  
      If p1x = p3x And p2x <> p4x Then 8{ep`$(K@  
         tt = "ac_n_bd_y" F JzjS;  
      ElseIf p1x <> p3x And p2x = p4x Then @.})nU  
         tt = "ac_y_bd_n" dw&Xg_$  
      ElseIf p1x <> p3x And p2x <> p4x Then TX>;2S3q  
         tt = "ac_y_bd_y" F4}Zl  
      End If 9$_}E`  
    Select Case tt p;@PfhEz)  
         Case "ac_n_bd_y" s#Le`pGo
W  
            'bd线段方程 T>c;q%A/  
            k_bd = bdy / bdx yqK82z5U*R  
            b_bd = p2y - k_bd * p2x b,cvQD  
            p_x = p1x )S%mKdOm $  
            p_y = k_bd * p_x + b_bd y>G{GQ  
         Case "ac_y_bd_n" B4.hJZ5  
            'ac线段方程 EgY]U1{  
            k_ac = acy / acx [J^,_iN[.  
            b_ac = p1y - k_ac * p1x {>z.y1  
            p_x = p2x u4S3NLG)  
            p_y = k_ac * p_x + b_ac &8;mcM//4  
        Case "ac_y_bd_y" qg>i8V  
           'ac，bd线段都要求 3{%/1>+x5  
           k_ac = acy / acx 'g^]ZTxb  
           b_ac = p1y - k_ac * p1x #*9*[Xbi  
           k_bd = bdy / bdx &v:iC u^|  
           b_bd = p2y - k_bd * p2x lu>>~vy6  
           p_x = -(b_bd - b_ac) / (k_bd - k_ac) oreSu;`$  
           p_y = k_ac * p_x + b_ac 9Kqr9U--v  
        End Select E5o0^^  
      rt(1) = p_x #[A/zH|xvV  
      rt(2) = p_y 6G(k{S  
     v9<p@GY"\  
'计算最大半径 GJ*AyYG  
   rr1 = (p1x - p_x) * (p1x - p_x) + (p1y - p_y) * (p1y - p_y) Ad"::&&Wk  
   rr2 = (p2x - p_x) * (p2x - p_x) + (p2y - p_y) * (p2y - p_y) _|*j8v3  
   rr3 = (p3x - p_x) * (p3x - p_x) + (p3y - p_y) * (p3y - p_y) ^=tyf&"  
   rr4 = (p4x - p_x) * (p4x - p_x) + (p4y - p_y) * (p4y - p_y) GxvVh71zP  
Dim bb(5) As Single , vky  
  bb(1) = rr1 wHAh6lm  
  bb(2) = rr2 >V]>h&`  
  bb(3) = rr3 vj#gY2qZ  
  bb(4) = rr4 b~\![HoCMM  
  nb = rr1 J)R2O4OEd  
For i = 1 To 4 im&|H-  
    If nb <= bb(i) Then 3{:d$- y  
       nb = bb(i) !0w'S>e  
    End If 6Fm.^9@  
Next i Edjh

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    rt(0) = Sqr(nb) <cl$?].RE!  
    rr = rt() t$}+oCnkv  
  End If 72PDqK#  
         \O^= Z{3y  
End Function

高手啊.人才啊.

lifei0715:高手啊.人才啊. (2013-04-08 19:15)  b
cOX/  

OY?uqP}c  
有热压工艺方面的人才或者资料分享下； ,E/vHI8  
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 !lHsJ)t  

高手真多！

楼主威武霸气.