[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： t|go5DXz4  
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图片:2.jpg

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关键点说几个： #]5&mKi  
1.区域是由点围成的，所以EXCEL中需要定义点的坐标（区域） ,[Dh2fPM,  
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
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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 h5LJijJ  

以下是几个重要的函数： G;PbTsW  
1.判断点在区域中函数 ki[;ZmQqY  
2.计算夹角函数 y8<lp+  
3.转置函数 x:f|3"\s  
4.得到区域中心点，及区域半径函数 F'V+2,.  
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） wc<2Uc  
6.文件开启与关闭，这个最常见了，就不说了

'计算夹角函数 ]>VJ--fH  
Function ff_angle(x1 As Single, y1 As Single, x2 As Single, y2 As Single, x3 As Single, y3 As Single) As Single Q9Y9{T  
   cax = x2 - x1 `@u+u0  
   cay = y2 - y1 /{eih]`x(  
   cbx = x2 - x3 Z-? Iip{  
   cby = y2 - y3 ZaukMEq  
   mo_jj = cax * cbx + cay * cby 9E->;0-  
   mo_ca = Sqr(cax * cax + cay * cay) 1+16i=BF)  
   mo_cb = Sqr(cbx * cbx + cby * cby) tj"v0u?
zW  
   cos_acb = mo_jj / (mo_ca * mo_cb) y]z)jqX<  
   'ff_cos = cos_acb +(QMy&DtS  
   If cos_acb >= 1 Then Mm>zpB`qP  
   nn = 0 ;qMnO_E  
   ElseIf cos_acb <= -1 Then h-?q6O/|  
   nn = 3.14159265258979 >,] eL  
   Else yZj}EBa  
   nn = Atn(-cos_acb / Sqr(-cos_acb * cos_acb + 1)) + 2 * Atn(1) +eV4g2w)  
   End If ?c=R"Yg$  
   'ff_angle = nn "lv:hz  
   ff_angle = nn * 180 / 3.14159265258979 &9RW9u "  
End Function

'判断点在区域内函数 +AgkPMy  
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 $8X tI  
Dim aob, boc, cod, doa, sum As Single 2d>d(^  
  If ppx = p1x And ppy = p1y Then JT.\f,z&  
     point_in = True JucxhjV#,  
     Exit Function =7J|KoKK  
  End If Vav+$l|j@  
  If ppx = p2x And ppy = p2y Then +>i
<sk  
     point_in = True ! 6p)t[s  
     Exit Function :~0^ib<v;  
  End If >F\rBc&  
   If ppx = p3x And ppy = p3y Then mP5d!+[8  
     point_in = True |4p<T!T  
     Exit Function ?;.1fJU>  
  End If y-)+I<M  
     Z68Wf5@to&  
    aob = ff_angle(p1x, p1y, ppx, ppy, p2x, p2y) cDQw`ORP*g  
    boc = ff_angle(p2x, p2y, ppx, ppy, p3x, p3y)  $D, wO  
    cod = ff_angle(p3x, p3y, ppx, ppy, p4x, p4y) . tH35/r  
    doa = ff_angle(p4x, p4y, ppx, ppy, p1x, p1y) @E"+qPp.3  
    sum = aob + boc + cod + doa u\1Wkxj  
    If 360.01 > sum And sum > 359.99 Then iu6WGmR  
       point_in = True =-Q  
    Else zZ+LisSs&  
       point_in = False eRl?9  
    End If Y;> p)'z  
End Function

'得到点半径,得到交点坐标函数 K3r>nGLBo  
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() ;5oH6{7_Z  
    '求得中心点坐标 4G;`KqR@  
Dim tt As String A]SB c2  
Dim rt(3) As Single |E_+*1lq.  
    '判断是否平行 ">D(+ xr!)  
   acx = p3x - p1x %dk$K!5D0  
   acy = p3y - p1y *l?% o{  
   bdx = p4x - p2x AZ]SRz9mKY  
   bdy = p4y - p2y e2hk  
   If acx * bdy = acy * bdx Then s<r.+zqW  
      rt(0) = 0 <T.3ZZ%  
      Exit Function A^Hp#b@  
   Else G`9F.T_Z^)  
      '判断斜率存在否 /wxxcq  
      If p1x = p3x And p2x <> p4x Then c"
sw@<HG  
         tt = "ac_n_bd_y" Ff#N|L'9_  
      ElseIf p1x <> p3x And p2x = p4x Then milK3+N  
         tt = "ac_y_bd_n" jf)JPa_  
      ElseIf p1x <> p3x And p2x <> p4x Then EPd.atA  
         tt = "ac_y_bd_y" 7jg(j~tQ  
      End If p2NB~t7Z  
    Select Case tt Y)j,(9  
         Case "ac_n_bd_y" 8s5ru)  
            'bd线段方程 $E~Lu$|  
            k_bd = bdy / bdx HG3>RcB  
            b_bd = p2y - k_bd * p2x ?e_}X3{  
            p_x = p1x wPO@f~[Ji  
            p_y = k_bd * p_x + b_bd e/% ;  
         Case "ac_y_bd_n" 36Z`.E>~L  
            'ac线段方程 eNC5' Z  
            k_ac = acy / acx (_n8$3T75  
            b_ac = p1y - k_ac * p1x cSs
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            p_x = p2x mlw BATi  
            p_y = k_ac * p_x + b_ac B3+WOf5W  
        Case "ac_y_bd_y" U#1yl6e\I  
           'ac，bd线段都要求 cCbr-Z&  
           k_ac = acy / acx 0?L$)T-B  
           b_ac = p1y - k_ac * p1x Tx?@*Q  
           k_bd = bdy / bdx qF6%XKbh=  
           b_bd = p2y - k_bd * p2x xo 'w+Av  
           p_x = -(b_bd - b_ac) / (k_bd - k_ac) i K[8At"Xo  
           p_y = k_ac * p_x + b_ac N
8(x),  
        End Select NizJq*V>  
      rt(1) = p_x Rw=E_q{  
      rt(2) = p_y =$zr t  
     .6/p4OR|  
'计算最大半径 +#db_k  
   rr1 = (p1x - p_x) * (p1x - p_x) + (p1y - p_y) * (p1y - p_y) 8}0y)aJ  
   rr2 = (p2x - p_x) * (p2x - p_x) + (p2y - p_y) * (p2y - p_y) np>!lF:  
   rr3 = (p3x - p_x) * (p3x - p_x) + (p3y - p_y) * (p3y - p_y) W
I4_4  
   rr4 = (p4x - p_x) * (p4x - p_x) + (p4y - p_y) * (p4y - p_y) kuud0VWJ  
Dim bb(5) As Single HY|SLk/E  
  bb(1) = rr1 -Jrc'e4K  
  bb(2) = rr2 sF3 l##Wv  
  bb(3) = rr3 :3*oAh8|  
  bb(4) = rr4 n2hsG.4  
  nb = rr1 ^t%M  
For i = 1 To 4 iR5soIR  
    If nb <= bb(i) Then ^yZSCrPGI  
       nb = bb(i) ^Jpd9KK  
    End If .MPOUo/e  
Next i G}xBYc0b  
    rt(0) = Sqr(nb) Cv7RCjMw  
    rr = rt() )3\rp$]1  
  End If 2}Plr{s9  
         ;S27m]Q?  
End Function

高手啊.人才啊.

lifei0715:高手啊.人才啊. (2013-04-08 19:15)  Cu5 - w  

A]slssE+  
有热压工艺方面的人才或者资料分享下； 3 g!h4?^  
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 \8H"lcj:  

高手真多！

楼主威武霸气.